diff options
Diffstat (limited to 'patches/server/0986-Rewrite-chunk-system.patch')
| -rw-r--r-- | patches/server/0986-Rewrite-chunk-system.patch | 21895 |
1 files changed, 21895 insertions, 0 deletions
diff --git a/patches/server/0986-Rewrite-chunk-system.patch b/patches/server/0986-Rewrite-chunk-system.patch new file mode 100644 index 0000000000..ccf7a62637 --- /dev/null +++ b/patches/server/0986-Rewrite-chunk-system.patch @@ -0,0 +1,21895 @@ +From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 +From: Spottedleaf <[email protected]> +Date: Thu, 11 Mar 2021 02:32:30 -0800 +Subject: [PATCH] Rewrite chunk system + +Rebased patches: + +New player chunk loader system + +Make ChunkStatus.EMPTY not rely on the main thread for completion + +In order to do this, we need to push the POI consistency checks +to a later status. Since FULL is the only other status that +uses the main thread, it can go there. + +The consistency checks are only really for when a desync occurs, +and so that delaying the check only matters when the chunk data +has desync'd. As long as the desync is sorted before the +chunk is full loaded (i.e before setBlock can occur on +a chunk), it should not matter. + +This change is primarily due to behavioural changes +in the chunk task queue brought by region threading - +which is to split the queue into separate regions. As such, +it is required that in order for the sync load to complete +that the region owning the chunk drain and execute the task +while ticking. However, that is not always possible in +region threading. Thus, removing the main thread reliance allows +the chunk to progress without requiring a tick thread. +Specifically, this allows far sync loads (outside of a specific +regions bounds) to occur without issue - namely with structure +searching. + +Increase parallelism for neighbour writing chunk statuses + +Namely, everything after FEATURES. By creating a dependency +chain indicating what chunks are in use, we can safely +schedule completely independent tasks in parallel. This +will allow the chunk system to scale beyond 10 threads +per world. + +Properly cancel chunk load tasks that were not scheduled + +Since the chunk load task was not scheduled, the entity/poi load +task fields will not be set, but the task complete counter +will not be adjusted. Thus, the chunk load task will not complete. + +To resolve this, detect when the entity/poi tasks were not scheduled +and decrement the task complete counter in such cases. + +Mark POI/Entity load tasks as completed before releasing scheduling lock + +It must be marked as completed during that lock hold since the +waiters field is set to null. Thus, any other thread attempting +a cancellation will fail to remove from waiters. Also, any +other thread attempting to cancel may set the completed field +to true which would cause accept() to fail as well. + +Completion was always designed to happen while holding the +scheduling lock to prevent these race conditions. The code +was originally set up to complete while not holding the +scheduling lock to avoid invoking callbacks while holding the +lock, however the access to the completion field was not +considered. + +Resolve this by marking the callback as completed during the +lock, but invoking the accept() function after releasing +the lock. This will prevent any cancellation attempts to be +blocked, and allow the current thread to complete the callback +without any issues. + +Cache whether region files do not exist + +The repeated I/O of creating the directory for the regionfile +or for checking if the file exists can be heavy in +when pushing chunk generation extremely hard - as each chunk gen +request may effectively go through to the I/O thread. + +Use coordinate-based locking to increase chunk system parallelism + +A significant overhead in Folia comes from the chunk system's +locks, the ticket lock and the scheduling lock. The public +test server, which had ~330 players, had signficant performance +problems with these locks: ~80% of the time spent ticking +was _waiting_ for the locks to free. Given that it used +around 15 cores total at peak, this is a complete and utter loss +of potential. + +To address this issue, I have replaced the ticket lock and scheduling +lock with two ReentrantAreaLocks. The ReentrantAreaLock takes a +shift, which is used internally to group positions into sections. +This grouping is neccessary, as the possible radius of area that +needs to be acquired for any given lock usage is up to 64. As such, +the shift is critical to reduce the number of areas required to lock +for any lock operation. Currently, it is set to a shift of 6, which +is identical to the ticket level propagation shift (and, it must be +at least the ticket level propagation shift AND the region shift). + +The chunk system locking changes required a complete rewrite of the +chunk system tick, chunk system unload, and chunk system ticket level +propagation - as all of the previous logic only works with a single +global lock. + +This does introduce two other section shifts: the lock shift, and the +ticket shift. The lock shift is simply what shift the area locks use, +and the ticket shift represents the size of the ticket sections. +Currently, these values are just set to the region shift for simplicity. +However, they are not arbitrary: the lock shift must be at least the size +of the ticket shift and must be at least the size of the region shift. +The ticket shift must also be >= the ceil(log2(max ticket level source)). + +The chunk system's ticket propagator is now global state, instead of +region state. This cleans up the logic for ticket levels significantly, +and removes usage of the region lock in this area, but it also means +that the addition of a ticket no longer creates a region. To alleviate +the side effects of this change, the global tick thread now processes +ticket level updates for each world every tick to guarantee eventual +ticket level processing. The chunk system also provides a hook to +process ticket level changes in a given _section_, so that the +region queue can guarantee that after adding its reference counter +that the region section is created/exists/wont be destroyed. + +The ticket propagator operates by updating the sources in a single ticket +section, and propagating the updates to its 1 radius neighbours. This +allows the ticket updates to occur in parallel or selectively (see above). +Currently, the process ticket level update function operates by +polling from a concurrent queue of sections to update and simply +invoking the single section update logic. This allows the function +to operate completely in parallel, provided the queue is ordered right. +Additionally, this limits the area used in the ticket/scheduling lock +when processing updates, which should massively increase parallelism compared +to before. + +The chunk system ticket addition for expirable ticket types has been modified +to no longer track exact tick deadlines, as this relies on what region the +ticket is in. Instead, the chunk system tracks a map of +lock section -> (chunk coordinate -> expire ticket count) and every ticket +has been changed to have a removeDelay count that is decremented each tick. +Each region searches its own sections to find tickets to try to expire. + +Chunk system unloading has been modified to track unloads by lock section. +The ordering is determined by which section a chunk resides in. +The unload process now removes from unload sections and processes +the full unload stages (1, 2, 3) before moving to the next section, if possible. +This allows the unload logic to only hold one lock section at a time for +each lock, which is a massive parallelism increase. + +In stress testing, these changes lowered the locking overhead to only 5% +from ~70%, which completely fix the original problem as described. + +== AT == +public net.minecraft.server.level.ChunkHolder pos +public net.minecraft.server.level.ChunkMap overworldDataStorage +public-f net.minecraft.world.level.chunk.storage.RegionFileStorage +public net.minecraft.server.level.ChunkMap getPoiManager()Lnet/minecraft/world/entity/ai/village/poi/PoiManager; + +diff --git a/src/main/java/ca/spottedleaf/concurrentutil/lock/ReentrantAreaLock.java b/src/main/java/ca/spottedleaf/concurrentutil/lock/ReentrantAreaLock.java +new file mode 100644 +index 0000000000000000000000000000000000000000..4fd9a0cd8f1e6ae1a97e963dc7731a80bc6fac5b +--- /dev/null ++++ b/src/main/java/ca/spottedleaf/concurrentutil/lock/ReentrantAreaLock.java +@@ -0,0 +1,395 @@ ++package ca.spottedleaf.concurrentutil.lock; ++ ++import ca.spottedleaf.concurrentutil.collection.MultiThreadedQueue; ++import it.unimi.dsi.fastutil.HashCommon; ++import java.util.ArrayList; ++import java.util.List; ++import java.util.concurrent.ConcurrentHashMap; ++import java.util.concurrent.locks.LockSupport; ++ ++public final class ReentrantAreaLock { ++ ++ public final int coordinateShift; ++ ++ // aggressive load factor to reduce contention ++ private final ConcurrentHashMap<Coordinate, Node> nodes = new ConcurrentHashMap<>(128, 0.2f); ++ ++ public ReentrantAreaLock(final int coordinateShift) { ++ this.coordinateShift = coordinateShift; ++ } ++ ++ public boolean isHeldByCurrentThread(final int x, final int z) { ++ final Thread currThread = Thread.currentThread(); ++ final int shift = this.coordinateShift; ++ final int sectionX = x >> shift; ++ final int sectionZ = z >> shift; ++ ++ final Coordinate coordinate = new Coordinate(Coordinate.key(sectionX, sectionZ)); ++ final Node node = this.nodes.get(coordinate); ++ ++ return node != null && node.thread == currThread; ++ } ++ ++ public boolean isHeldByCurrentThread(final int centerX, final int centerZ, final int radius) { ++ return this.isHeldByCurrentThread(centerX - radius, centerZ - radius, centerX + radius, centerZ + radius); ++ } ++ ++ public boolean isHeldByCurrentThread(final int fromX, final int fromZ, final int toX, final int toZ) { ++ if (fromX > toX || fromZ > toZ) { ++ throw new IllegalArgumentException(); ++ } ++ ++ final Thread currThread = Thread.currentThread(); ++ final int shift = this.coordinateShift; ++ final int fromSectionX = fromX >> shift; ++ final int fromSectionZ = fromZ >> shift; ++ final int toSectionX = toX >> shift; ++ final int toSectionZ = toZ >> shift; ++ ++ for (int currZ = fromSectionZ; currZ <= toSectionZ; ++currZ) { ++ for (int currX = fromSectionX; currX <= toSectionX; ++currX) { ++ final Coordinate coordinate = new Coordinate(Coordinate.key(currX, currZ)); ++ ++ final Node node = this.nodes.get(coordinate); ++ ++ if (node == null || node.thread != currThread) { ++ return false; ++ } ++ } ++ } ++ ++ return true; ++ } ++ ++ public Node tryLock(final int x, final int z) { ++ return this.tryLock(x, z, x, z); ++ } ++ ++ public Node tryLock(final int centerX, final int centerZ, final int radius) { ++ return this.tryLock(centerX - radius, centerZ - radius, centerX + radius, centerZ + radius); ++ } ++ ++ public Node tryLock(final int fromX, final int fromZ, final int toX, final int toZ) { ++ if (fromX > toX || fromZ > toZ) { ++ throw new IllegalArgumentException(); ++ } ++ ++ final Thread currThread = Thread.currentThread(); ++ final int shift = this.coordinateShift; ++ final int fromSectionX = fromX >> shift; ++ final int fromSectionZ = fromZ >> shift; ++ final int toSectionX = toX >> shift; ++ final int toSectionZ = toZ >> shift; ++ ++ final List<Coordinate> areaAffected = new ArrayList<>(); ++ ++ final Node ret = new Node(this, areaAffected, currThread); ++ ++ boolean failed = false; ++ ++ // try to fast acquire area ++ for (int currZ = fromSectionZ; currZ <= toSectionZ; ++currZ) { ++ for (int currX = fromSectionX; currX <= toSectionX; ++currX) { ++ final Coordinate coordinate = new Coordinate(Coordinate.key(currX, currZ)); ++ ++ final Node prev = this.nodes.putIfAbsent(coordinate, ret); ++ ++ if (prev == null) { ++ areaAffected.add(coordinate); ++ continue; ++ } ++ ++ if (prev.thread != currThread) { ++ failed = true; ++ break; ++ } ++ } ++ } ++ ++ if (!failed) { ++ return ret; ++ } ++ ++ // failed, undo logic ++ if (!areaAffected.isEmpty()) { ++ for (int i = 0, len = areaAffected.size(); i < len; ++i) { ++ final Coordinate key = areaAffected.get(i); ++ ++ if (this.nodes.remove(key) != ret) { ++ throw new IllegalStateException(); ++ } ++ } ++ ++ areaAffected.clear(); ++ ++ // since we inserted, we need to drain waiters ++ Thread unpark; ++ while ((unpark = ret.pollOrBlockAdds()) != null) { ++ LockSupport.unpark(unpark); ++ } ++ } ++ ++ return null; ++ } ++ ++ public Node lock(final int x, final int z) { ++ final Thread currThread = Thread.currentThread(); ++ final int shift = this.coordinateShift; ++ final int sectionX = x >> shift; ++ final int sectionZ = z >> shift; ++ ++ final List<Coordinate> areaAffected = new ArrayList<>(1); ++ ++ final Node ret = new Node(this, areaAffected, currThread); ++ final Coordinate coordinate = new Coordinate(Coordinate.key(sectionX, sectionZ)); ++ ++ for (long failures = 0L;;) { ++ final Node park; ++ ++ // try to fast acquire area ++ { ++ final Node prev = this.nodes.putIfAbsent(coordinate, ret); ++ ++ if (prev == null) { ++ areaAffected.add(coordinate); ++ return ret; ++ } else if (prev.thread != currThread) { ++ park = prev; ++ } else { ++ // only one node we would want to acquire, and it's owned by this thread already ++ return ret; ++ } ++ } ++ ++ ++failures; ++ ++ if (failures > 128L && park.add(currThread)) { ++ LockSupport.park(); ++ } else { ++ // high contention, spin wait ++ if (failures < 128L) { ++ for (long i = 0; i < failures; ++i) { ++ Thread.onSpinWait(); ++ } ++ failures = failures << 1; ++ } else if (failures < 1_200L) { ++ LockSupport.parkNanos(1_000L); ++ failures = failures + 1L; ++ } else { // scale 0.1ms (100us) per failure ++ Thread.yield(); ++ LockSupport.parkNanos(100_000L * failures); ++ failures = failures + 1L; ++ } ++ } ++ } ++ } ++ ++ public Node lock(final int centerX, final int centerZ, final int radius) { ++ return this.lock(centerX - radius, centerZ - radius, centerX + radius, centerZ + radius); ++ } ++ ++ public Node lock(final int fromX, final int fromZ, final int toX, final int toZ) { ++ if (fromX > toX || fromZ > toZ) { ++ throw new IllegalArgumentException(); ++ } ++ ++ final Thread currThread = Thread.currentThread(); ++ final int shift = this.coordinateShift; ++ final int fromSectionX = fromX >> shift; ++ final int fromSectionZ = fromZ >> shift; ++ final int toSectionX = toX >> shift; ++ final int toSectionZ = toZ >> shift; ++ ++ if (((fromSectionX ^ toSectionX) | (fromSectionZ ^ toSectionZ)) == 0) { ++ return this.lock(fromX, fromZ); ++ } ++ ++ final List<Coordinate> areaAffected = new ArrayList<>(); ++ ++ final Node ret = new Node(this, areaAffected, currThread); ++ ++ for (long failures = 0L;;) { ++ Node park = null; ++ boolean addedToArea = false; ++ boolean alreadyOwned = false; ++ boolean allOwned = true; ++ ++ // try to fast acquire area ++ for (int currZ = fromSectionZ; currZ <= toSectionZ; ++currZ) { ++ for (int currX = fromSectionX; currX <= toSectionX; ++currX) { ++ final Coordinate coordinate = new Coordinate(Coordinate.key(currX, currZ)); ++ ++ final Node prev = this.nodes.putIfAbsent(coordinate, ret); ++ ++ if (prev == null) { ++ addedToArea = true; ++ allOwned = false; ++ areaAffected.add(coordinate); ++ continue; ++ } ++ ++ if (prev.thread != currThread) { ++ park = prev; ++ alreadyOwned = true; ++ break; ++ } ++ } ++ } ++ ++ if (park == null) { ++ if (alreadyOwned && !allOwned) { ++ throw new IllegalStateException("Improper lock usage: Should never acquire intersecting areas"); ++ } ++ return ret; ++ } ++ ++ // failed, undo logic ++ if (addedToArea) { ++ for (int i = 0, len = areaAffected.size(); i < len; ++i) { ++ final Coordinate key = areaAffected.get(i); ++ ++ if (this.nodes.remove(key) != ret) { ++ throw new IllegalStateException(); ++ } ++ } ++ ++ areaAffected.clear(); ++ ++ // since we inserted, we need to drain waiters ++ Thread unpark; ++ while ((unpark = ret.pollOrBlockAdds()) != null) { ++ LockSupport.unpark(unpark); ++ } ++ } ++ ++ ++failures; ++ ++ if (failures > 128L && park.add(currThread)) { ++ LockSupport.park(park); ++ } else { ++ // high contention, spin wait ++ if (failures < 128L) { ++ for (long i = 0; i < failures; ++i) { ++ Thread.onSpinWait(); ++ } ++ failures = failures << 1; ++ } else if (failures < 1_200L) { ++ LockSupport.parkNanos(1_000L); ++ failures = failures + 1L; ++ } else { // scale 0.1ms (100us) per failure ++ Thread.yield(); ++ LockSupport.parkNanos(100_000L * failures); ++ failures = failures + 1L; ++ } ++ } ++ ++ if (addedToArea) { ++ // try again, so we need to allow adds so that other threads can properly block on us ++ ret.allowAdds(); ++ } ++ } ++ } ++ ++ public void unlock(final Node node) { ++ if (node.lock != this) { ++ throw new IllegalStateException("Unlock target lock mismatch"); ++ } ++ ++ final List<Coordinate> areaAffected = node.areaAffected; ++ ++ if (areaAffected.isEmpty()) { ++ // here we are not in the node map, and so do not need to remove from the node map or unblock any waiters ++ return; ++ } ++ ++ // remove from node map; allowing other threads to lock ++ for (int i = 0, len = areaAffected.size(); i < len; ++i) { ++ final Coordinate coordinate = areaAffected.get(i); ++ if (this.nodes.remove(coordinate) != node) { ++ throw new IllegalStateException(); ++ } ++ } ++ ++ Thread unpark; ++ while ((unpark = node.pollOrBlockAdds()) != null) { ++ LockSupport.unpark(unpark); ++ } ++ } ++ ++ public static final class Node extends MultiThreadedQueue<Thread> { ++ ++ private final ReentrantAreaLock lock; ++ private final List<Coordinate> areaAffected; ++ private final Thread thread; ++ //private final Throwable WHO_CREATED_MY_ASS = new Throwable(); ++ ++ private Node(final ReentrantAreaLock lock, final List<Coordinate> areaAffected, final Thread thread) { ++ this.lock = lock; ++ this.areaAffected = areaAffected; ++ this.thread = thread; ++ } ++ ++ @Override ++ public String toString() { ++ return "Node{" + ++ "areaAffected=" + this.areaAffected + ++ ", thread=" + this.thread + ++ '}'; ++ } ++ } ++ ++ private static final class Coordinate implements Comparable<Coordinate> { ++ ++ public final long key; ++ ++ public Coordinate(final long key) { ++ this.key = key; ++ } ++ ++ public Coordinate(final int x, final int z) { ++ this.key = key(x, z); ++ } ++ ++ public static long key(final int x, final int z) { ++ return ((long)z << 32) | (x & 0xFFFFFFFFL); ++ } ++ ++ public static int x(final long key) { ++ return (int)key; ++ } ++ ++ public static int z(final long key) { ++ return (int)(key >>> 32); ++ } ++ ++ @Override ++ public int hashCode() { ++ return (int)HashCommon.mix(this.key); ++ } ++ ++ @Override ++ public boolean equals(final Object obj) { ++ if (this == obj) { ++ return true; ++ } ++ ++ if (!(obj instanceof Coordinate other)) { ++ return false; ++ } ++ ++ return this.key == other.key; ++ } ++ ++ // This class is intended for HashMap/ConcurrentHashMap usage, which do treeify bin nodes if the chain ++ // is too large. So we should implement compareTo to help. ++ @Override ++ public int compareTo(final Coordinate other) { ++ return Long.compare(this.key, other.key); ++ } ++ ++ @Override ++ public String toString() { ++ return "[" + x(this.key) + "," + z(this.key) + "]"; ++ } ++ } ++} +diff --git a/src/main/java/ca/spottedleaf/concurrentutil/lock/SyncReentrantAreaLock.java b/src/main/java/ca/spottedleaf/concurrentutil/lock/SyncReentrantAreaLock.java +new file mode 100644 +index 0000000000000000000000000000000000000000..64b5803d002b2968841a5ddee987f98b72964e87 +--- /dev/null ++++ b/src/main/java/ca/spottedleaf/concurrentutil/lock/SyncReentrantAreaLock.java +@@ -0,0 +1,217 @@ ++package ca.spottedleaf.concurrentutil.lock; ++ ++import ca.spottedleaf.concurrentutil.collection.MultiThreadedQueue; ++import it.unimi.dsi.fastutil.longs.Long2ReferenceOpenHashMap; ++import it.unimi.dsi.fastutil.longs.LongArrayList; ++import java.util.concurrent.locks.LockSupport; ++ ++// not concurrent, unlike ReentrantAreaLock ++// no incorrect lock usage detection (acquiring intersecting areas) ++// this class is nothing more than a performance reference for ReentrantAreaLock ++public final class SyncReentrantAreaLock { ++ ++ private final int coordinateShift; ++ ++ // aggressive load factor to reduce contention ++ private final Long2ReferenceOpenHashMap<Node> nodes = new Long2ReferenceOpenHashMap<>(128, 0.2f); ++ ++ public SyncReentrantAreaLock(final int coordinateShift) { ++ this.coordinateShift = coordinateShift; ++ } ++ ++ private static long key(final int x, final int z) { ++ return ((long)z << 32) | (x & 0xFFFFFFFFL); ++ } ++ ++ public Node lock(final int x, final int z) { ++ final Thread currThread = Thread.currentThread(); ++ final int shift = this.coordinateShift; ++ final int sectionX = x >> shift; ++ final int sectionZ = z >> shift; ++ ++ final LongArrayList areaAffected = new LongArrayList(); ++ ++ final Node ret = new Node(this, areaAffected, currThread); ++ ++ final long coordinate = key(sectionX, sectionZ); ++ ++ for (long failures = 0L;;) { ++ final Node park; ++ ++ synchronized (this) { ++ // try to fast acquire area ++ final Node prev = this.nodes.putIfAbsent(coordinate, ret); ++ ++ if (prev == null) { ++ areaAffected.add(coordinate); ++ return ret; ++ } else if (prev.thread != currThread) { ++ park = prev; ++ } else { ++ // only one node we would want to acquire, and it's owned by this thread already ++ return ret; ++ } ++ } ++ ++ ++failures; ++ ++ if (failures > 128L && park.add(currThread)) { ++ LockSupport.park(); ++ } else { ++ // high contention, spin wait ++ if (failures < 128L) { ++ for (long i = 0; i < failures; ++i) { ++ Thread.onSpinWait(); ++ } ++ failures = failures << 1; ++ } else if (failures < 1_200L) { ++ LockSupport.parkNanos(1_000L); ++ failures = failures + 1L; ++ } else { // scale 0.1ms (100us) per failure ++ Thread.yield(); ++ LockSupport.parkNanos(100_000L * failures); ++ failures = failures + 1L; ++ } ++ } ++ } ++ } ++ ++ public Node lock(final int centerX, final int centerZ, final int radius) { ++ return this.lock(centerX - radius, centerZ - radius, centerX + radius, centerZ + radius); ++ } ++ ++ public Node lock(final int fromX, final int fromZ, final int toX, final int toZ) { ++ if (fromX > toX || fromZ > toZ) { ++ throw new IllegalArgumentException(); ++ } ++ ++ final Thread currThread = Thread.currentThread(); ++ final int shift = this.coordinateShift; ++ final int fromSectionX = fromX >> shift; ++ final int fromSectionZ = fromZ >> shift; ++ final int toSectionX = toX >> shift; ++ final int toSectionZ = toZ >> shift; ++ ++ final LongArrayList areaAffected = new LongArrayList(); ++ ++ final Node ret = new Node(this, areaAffected, currThread); ++ ++ for (long failures = 0L;;) { ++ Node park = null; ++ boolean addedToArea = false; ++ ++ synchronized (this) { ++ // try to fast acquire area ++ for (int currZ = fromSectionZ; currZ <= toSectionZ; ++currZ) { ++ for (int currX = fromSectionX; currX <= toSectionX; ++currX) { ++ final long coordinate = key(currX, currZ); ++ ++ final Node prev = this.nodes.putIfAbsent(coordinate, ret); ++ ++ if (prev == null) { ++ addedToArea = true; ++ areaAffected.add(coordinate); ++ continue; ++ } ++ ++ if (prev.thread != currThread) { ++ park = prev; ++ break; ++ } ++ } ++ } ++ ++ if (park == null) { ++ return ret; ++ } ++ ++ // failed, undo logic ++ if (!areaAffected.isEmpty()) { ++ for (int i = 0, len = areaAffected.size(); i < len; ++i) { ++ final long key = areaAffected.getLong(i); ++ ++ if (!this.nodes.remove(key, ret)) { ++ throw new IllegalStateException(); ++ } ++ } ++ } ++ } ++ ++ if (addedToArea) { ++ areaAffected.clear(); ++ // since we inserted, we need to drain waiters ++ Thread unpark; ++ while ((unpark = ret.pollOrBlockAdds()) != null) { ++ LockSupport.unpark(unpark); ++ } ++ } ++ ++ ++failures; ++ ++ if (failures > 128L && park.add(currThread)) { ++ LockSupport.park(); ++ } else { ++ // high contention, spin wait ++ if (failures < 128L) { ++ for (long i = 0; i < failures; ++i) { ++ Thread.onSpinWait(); ++ } ++ failures = failures << 1; ++ } else if (failures < 1_200L) { ++ LockSupport.parkNanos(1_000L); ++ failures = failures + 1L; ++ } else { // scale 0.1ms (100us) per failure ++ Thread.yield(); ++ LockSupport.parkNanos(100_000L * failures); ++ failures = failures + 1L; ++ } ++ } ++ ++ if (addedToArea) { ++ // try again, so we need to allow adds so that other threads can properly block on us ++ ret.allowAdds(); ++ } ++ } ++ } ++ ++ public void unlock(final Node node) { ++ if (node.lock != this) { ++ throw new IllegalStateException("Unlock target lock mismatch"); ++ } ++ ++ final LongArrayList areaAffected = node.areaAffected; ++ ++ if (areaAffected.isEmpty()) { ++ // here we are not in the node map, and so do not need to remove from the node map or unblock any waiters ++ return; ++ } ++ ++ // remove from node map; allowing other threads to lock ++ synchronized (this) { ++ for (int i = 0, len = areaAffected.size(); i < len; ++i) { ++ final long coordinate = areaAffected.getLong(i); ++ if (!this.nodes.remove(coordinate, node)) { ++ throw new IllegalStateException(); ++ } ++ } ++ } ++ ++ Thread unpark; ++ while ((unpark = node.pollOrBlockAdds()) != null) { ++ LockSupport.unpark(unpark); ++ } ++ } ++ ++ public static final class Node extends MultiThreadedQueue<Thread> { ++ ++ private final SyncReentrantAreaLock lock; ++ private final LongArrayList areaAffected; ++ private final Thread thread; ++ ++ private Node(final SyncReentrantAreaLock lock, final LongArrayList areaAffected, final Thread thread) { ++ this.lock = lock; ++ this.areaAffected = areaAffected; ++ this.thread = thread; ++ } ++ } ++} +diff --git a/src/main/java/ca/spottedleaf/starlight/common/light/StarLightInterface.java b/src/main/java/ca/spottedleaf/starlight/common/light/StarLightInterface.java +index e0338db4d6fa359029ed5edeacc3646aa98701f5..c03dbb4a74d00d794be4139f0f7c4b5ff1b01d38 100644 +--- a/src/main/java/ca/spottedleaf/starlight/common/light/StarLightInterface.java ++++ b/src/main/java/ca/spottedleaf/starlight/common/light/StarLightInterface.java +@@ -41,14 +41,14 @@ public final class StarLightInterface { + protected final ArrayDeque<SkyStarLightEngine> cachedSkyPropagators; + protected final ArrayDeque<BlockStarLightEngine> cachedBlockPropagators; + +- protected final LightQueue lightQueue = new LightQueue(this); ++ public final io.papermc.paper.chunk.system.light.LightQueue lightQueue; // Paper - replace light queue + + protected final LayerLightEventListener skyReader; + protected final LayerLightEventListener blockReader; + protected final boolean isClientSide; + +- protected final int minSection; +- protected final int maxSection; ++ public final int minSection; // Paper - public ++ public final int maxSection; // Paper - public + protected final int minLightSection; + protected final int maxLightSection; + +@@ -182,6 +182,7 @@ public final class StarLightInterface { + StarLightInterface.this.sectionChange(pos, notReady); + } + }; ++ this.lightQueue = new io.papermc.paper.chunk.system.light.LightQueue(this); // Paper - replace light queue + } + + public boolean hasSkyLight() { +@@ -333,7 +334,7 @@ public final class StarLightInterface { + return this.lightAccess; + } + +- protected final SkyStarLightEngine getSkyLightEngine() { ++ public final SkyStarLightEngine getSkyLightEngine() { // Paper - public + if (this.cachedSkyPropagators == null) { + return null; + } +@@ -348,7 +349,7 @@ public final class StarLightInterface { + return ret; + } + +- protected final void releaseSkyLightEngine(final SkyStarLightEngine engine) { ++ public final void releaseSkyLightEngine(final SkyStarLightEngine engine) { // Paper - public + if (this.cachedSkyPropagators == null) { + return; + } +@@ -357,7 +358,7 @@ public final class StarLightInterface { + } + } + +- protected final BlockStarLightEngine getBlockLightEngine() { ++ public final BlockStarLightEngine getBlockLightEngine() { // Paper - public + if (this.cachedBlockPropagators == null) { + return null; + } +@@ -372,7 +373,7 @@ public final class StarLightInterface { + return ret; + } + +- protected final void releaseBlockLightEngine(final BlockStarLightEngine engine) { ++ public final void releaseBlockLightEngine(final BlockStarLightEngine engine) { // Paper - public + if (this.cachedBlockPropagators == null) { + return; + } +@@ -381,7 +382,7 @@ public final class StarLightInterface { + } + } + +- public LightQueue.ChunkTasks blockChange(final BlockPos pos) { ++ public io.papermc.paper.chunk.system.light.LightQueue.ChunkTasks blockChange(final BlockPos pos) { // Paper - rewrite chunk system + if (this.world == null || pos.getY() < WorldUtil.getMinBlockY(this.world) || pos.getY() > WorldUtil.getMaxBlockY(this.world)) { // empty world + return null; + } +@@ -389,7 +390,7 @@ public final class StarLightInterface { + return this.lightQueue.queueBlockChange(pos); + } + +- public LightQueue.ChunkTasks sectionChange(final SectionPos pos, final boolean newEmptyValue) { ++ public io.papermc.paper.chunk.system.light.LightQueue.ChunkTasks sectionChange(final SectionPos pos, final boolean newEmptyValue) { // Paper - rewrite chunk system + if (this.world == null) { // empty world + return null; + } +@@ -519,57 +520,15 @@ public final class StarLightInterface { + } + + public void scheduleChunkLight(final ChunkPos pos, final Runnable run) { +- this.lightQueue.queueChunkLighting(pos, run); ++ throw new UnsupportedOperationException("No longer implemented, use the new lightQueue field to queue tasks"); // Paper - replace light queue + } + + public void removeChunkTasks(final ChunkPos pos) { +- this.lightQueue.removeChunk(pos); ++ throw new UnsupportedOperationException("No longer implemented, use the new lightQueue field to queue tasks"); // Paper - replace light queue + } + + public void propagateChanges() { +- if (this.lightQueue.isEmpty()) { +- return; +- } +- +- final SkyStarLightEngine skyEngine = this.getSkyLightEngine(); +- final BlockStarLightEngine blockEngine = this.getBlockLightEngine(); +- +- try { +- LightQueue.ChunkTasks task; +- while ((task = this.lightQueue.removeFirstTask()) != null) { +- if (task.lightTasks != null) { +- for (final Runnable run : task.lightTasks) { +- run.run(); +- } +- } +- +- final long coordinate = task.chunkCoordinate; +- final int chunkX = CoordinateUtils.getChunkX(coordinate); +- final int chunkZ = CoordinateUtils.getChunkZ(coordinate); +- +- final Set<BlockPos> positions = task.changedPositions; +- final Boolean[] sectionChanges = task.changedSectionSet; +- +- if (skyEngine != null && (!positions.isEmpty() || sectionChanges != null)) { +- skyEngine.blocksChangedInChunk(this.lightAccess, chunkX, chunkZ, positions, sectionChanges); +- } +- if (blockEngine != null && (!positions.isEmpty() || sectionChanges != null)) { +- blockEngine.blocksChangedInChunk(this.lightAccess, chunkX, chunkZ, positions, sectionChanges); +- } +- +- if (skyEngine != null && task.queuedEdgeChecksSky != null) { +- skyEngine.checkChunkEdges(this.lightAccess, chunkX, chunkZ, task.queuedEdgeChecksSky); +- } +- if (blockEngine != null && task.queuedEdgeChecksBlock != null) { +- blockEngine.checkChunkEdges(this.lightAccess, chunkX, chunkZ, task.queuedEdgeChecksBlock); +- } +- +- task.onComplete.complete(null); +- } +- } finally { +- this.releaseSkyLightEngine(skyEngine); +- this.releaseBlockLightEngine(blockEngine); +- } ++ throw new UnsupportedOperationException("No longer implemented, task draining is now performed by the light thread"); // Paper - replace light queue + } + + public static final class LightQueue { +diff --git a/src/main/java/co/aikar/timings/WorldTimingsHandler.java b/src/main/java/co/aikar/timings/WorldTimingsHandler.java +index 2f0d9b953802dee821cfde82d22b0567cce8ee91..22687667ec69a954261e55e59261286ac1b8b8cd 100644 +--- a/src/main/java/co/aikar/timings/WorldTimingsHandler.java ++++ b/src/main/java/co/aikar/timings/WorldTimingsHandler.java +@@ -59,6 +59,16 @@ public class WorldTimingsHandler { + + public final Timing miscMobSpawning; + ++ public final Timing poiUnload; ++ public final Timing chunkUnload; ++ public final Timing poiSaveDataSerialization; ++ public final Timing chunkSave; ++ public final Timing chunkSaveDataSerialization; ++ public final Timing chunkSaveIOWait; ++ public final Timing chunkUnloadPrepareSave; ++ public final Timing chunkUnloadPOISerialization; ++ public final Timing chunkUnloadDataSave; ++ + public WorldTimingsHandler(Level server) { + String name = ((PrimaryLevelData) server.getLevelData()).getLevelName() + " - "; + +@@ -112,6 +122,16 @@ public class WorldTimingsHandler { + + + miscMobSpawning = Timings.ofSafe(name + "Mob spawning - Misc"); ++ ++ poiUnload = Timings.ofSafe(name + "Chunk unload - POI"); ++ chunkUnload = Timings.ofSafe(name + "Chunk unload - Chunk"); ++ poiSaveDataSerialization = Timings.ofSafe(name + "Chunk save - POI Data serialization"); ++ chunkSave = Timings.ofSafe(name + "Chunk save - Chunk"); ++ chunkSaveDataSerialization = Timings.ofSafe(name + "Chunk save - Chunk Data serialization"); ++ chunkSaveIOWait = Timings.ofSafe(name + "Chunk save - Chunk IO Wait"); ++ chunkUnloadPrepareSave = Timings.ofSafe(name + "Chunk unload - Async Save Prepare"); ++ chunkUnloadPOISerialization = Timings.ofSafe(name + "Chunk unload - POI Data Serialization"); ++ chunkUnloadDataSave = Timings.ofSafe(name + "Chunk unload - Data Serialization"); + } + + public static Timing getTickList(ServerLevel worldserver, String timingsType) { +diff --git a/src/main/java/io/papermc/paper/chunk/system/ChunkSystem.java b/src/main/java/io/papermc/paper/chunk/system/ChunkSystem.java +index cff2f04409fab9abca87ceec85a551e1d59f9e7d..b1400f8bb661b13834c4176f94433435500113ba 100644 +--- a/src/main/java/io/papermc/paper/chunk/system/ChunkSystem.java ++++ b/src/main/java/io/papermc/paper/chunk/system/ChunkSystem.java +@@ -32,192 +32,41 @@ public final class ChunkSystem { + } + + public static void scheduleChunkTask(final ServerLevel level, final int chunkX, final int chunkZ, final Runnable run, final PrioritisedExecutor.Priority priority) { +- level.chunkSource.mainThreadProcessor.execute(run); ++ level.chunkTaskScheduler.scheduleChunkTask(chunkX, chunkZ, run, priority); // Paper - rewrite chunk system + } + + public static void scheduleChunkLoad(final ServerLevel level, final int chunkX, final int chunkZ, final boolean gen, + final ChunkStatus toStatus, final boolean addTicket, final PrioritisedExecutor.Priority priority, + final Consumer<ChunkAccess> onComplete) { +- if (gen) { +- scheduleChunkLoad(level, chunkX, chunkZ, toStatus, addTicket, priority, onComplete); +- return; +- } +- scheduleChunkLoad(level, chunkX, chunkZ, ChunkStatus.EMPTY, addTicket, priority, (final ChunkAccess chunk) -> { +- if (chunk == null) { +- onComplete.accept(null); +- } else { +- if (chunk.getStatus().isOrAfter(toStatus)) { +- scheduleChunkLoad(level, chunkX, chunkZ, toStatus, addTicket, priority, onComplete); +- } else { +- onComplete.accept(null); +- } +- } +- }); ++ level.chunkTaskScheduler.scheduleChunkLoad(chunkX, chunkZ, gen, toStatus, addTicket, priority, onComplete); // Paper - rewrite chunk system + } + +- static final TicketType<Long> CHUNK_LOAD = TicketType.create("chunk_load", Long::compareTo); +- +- private static long chunkLoadCounter = 0L; ++ // Paper - rewrite chunk system + public static void scheduleChunkLoad(final ServerLevel level, final int chunkX, final int chunkZ, final ChunkStatus toStatus, + final boolean addTicket, final PrioritisedExecutor.Priority priority, final Consumer<ChunkAccess> onComplete) { +- if (!Bukkit.isPrimaryThread()) { +- scheduleChunkTask(level, chunkX, chunkZ, () -> { +- scheduleChunkLoad(level, chunkX, chunkZ, toStatus, addTicket, priority, onComplete); +- }, priority); +- return; +- } +- +- final int minLevel = 33 + ChunkStatus.getDistance(toStatus); +- final Long chunkReference = addTicket ? Long.valueOf(++chunkLoadCounter) : null; +- final ChunkPos chunkPos = new ChunkPos(chunkX, chunkZ); +- +- if (addTicket) { +- level.chunkSource.addTicketAtLevel(CHUNK_LOAD, chunkPos, minLevel, chunkReference); +- } +- level.chunkSource.runDistanceManagerUpdates(); +- +- final Consumer<ChunkAccess> loadCallback = (final ChunkAccess chunk) -> { +- try { +- if (onComplete != null) { +- onComplete.accept(chunk); +- } +- } catch (final ThreadDeath death) { +- throw death; +- } catch (final Throwable thr) { +- LOGGER.error("Exception handling chunk load callback", thr); +- SneakyThrow.sneaky(thr); +- } finally { +- if (addTicket) { +- level.chunkSource.addTicketAtLevel(TicketType.UNKNOWN, chunkPos, minLevel, chunkPos); +- level.chunkSource.removeTicketAtLevel(CHUNK_LOAD, chunkPos, minLevel, chunkReference); +- } +- } +- }; +- +- final ChunkHolder holder = level.chunkSource.chunkMap.updatingChunkMap.get(CoordinateUtils.getChunkKey(chunkX, chunkZ)); +- +- if (holder == null || holder.getTicketLevel() > minLevel) { +- loadCallback.accept(null); +- return; +- } +- +- final CompletableFuture<Either<ChunkAccess, ChunkHolder.ChunkLoadingFailure>> loadFuture = holder.getOrScheduleFuture(toStatus, level.chunkSource.chunkMap); +- +- if (loadFuture.isDone()) { +- loadCallback.accept(loadFuture.join().left().orElse(null)); +- return; +- } +- +- loadFuture.whenCompleteAsync((final Either<ChunkAccess, ChunkHolder.ChunkLoadingFailure> either, final Throwable thr) -> { +- if (thr != null) { +- loadCallback.accept(null); +- return; +- } +- loadCallback.accept(either.left().orElse(null)); +- }, (final Runnable r) -> { +- scheduleChunkTask(level, chunkX, chunkZ, r, PrioritisedExecutor.Priority.HIGHEST); +- }); ++ level.chunkTaskScheduler.scheduleChunkLoad(chunkX, chunkZ, toStatus, addTicket, priority, onComplete); // Paper - rewrite chunk system + } + + public static void scheduleTickingState(final ServerLevel level, final int chunkX, final int chunkZ, + final FullChunkStatus toStatus, final boolean addTicket, + final PrioritisedExecutor.Priority priority, final Consumer<LevelChunk> onComplete) { +- // This method goes unused until the chunk system rewrite +- if (toStatus == FullChunkStatus.INACCESSIBLE) { +- throw new IllegalArgumentException("Cannot wait for INACCESSIBLE status"); +- } +- +- if (!Bukkit.isPrimaryThread()) { +- scheduleChunkTask(level, chunkX, chunkZ, () -> { +- scheduleTickingState(level, chunkX, chunkZ, toStatus, addTicket, priority, onComplete); +- }, priority); +- return; +- } +- +- final int minLevel = 33 - (toStatus.ordinal() - 1); +- final int radius = toStatus.ordinal() - 1; +- final Long chunkReference = addTicket ? Long.valueOf(++chunkLoadCounter) : null; +- final ChunkPos chunkPos = new ChunkPos(chunkX, chunkZ); +- +- if (addTicket) { +- level.chunkSource.addTicketAtLevel(CHUNK_LOAD, chunkPos, minLevel, chunkReference); +- } +- level.chunkSource.runDistanceManagerUpdates(); +- +- final Consumer<LevelChunk> loadCallback = (final LevelChunk chunk) -> { +- try { +- if (onComplete != null) { +- onComplete.accept(chunk); +- } +- } catch (final ThreadDeath death) { +- throw death; +- } catch (final Throwable thr) { +- LOGGER.error("Exception handling chunk load callback", thr); +- SneakyThrow.sneaky(thr); +- } finally { +- if (addTicket) { +- level.chunkSource.addTicketAtLevel(TicketType.UNKNOWN, chunkPos, minLevel, chunkPos); +- level.chunkSource.removeTicketAtLevel(CHUNK_LOAD, chunkPos, minLevel, chunkReference); +- } +- } +- }; +- +- final ChunkHolder holder = level.chunkSource.chunkMap.updatingChunkMap.get(CoordinateUtils.getChunkKey(chunkX, chunkZ)); +- +- if (holder == null || holder.getTicketLevel() > minLevel) { +- loadCallback.accept(null); +- return; +- } +- +- final CompletableFuture<Either<LevelChunk, ChunkHolder.ChunkLoadingFailure>> tickingState; +- switch (toStatus) { +- case FULL: { +- tickingState = holder.getFullChunkFuture(); +- break; +- } +- case BLOCK_TICKING: { +- tickingState = holder.getTickingChunkFuture(); +- break; +- } +- case ENTITY_TICKING: { +- tickingState = holder.getEntityTickingChunkFuture(); +- break; +- } +- default: { +- throw new IllegalStateException("Cannot reach here"); +- } +- } +- +- if (tickingState.isDone()) { +- loadCallback.accept(tickingState.join().left().orElse(null)); +- return; +- } +- +- tickingState.whenCompleteAsync((final Either<LevelChunk, ChunkHolder.ChunkLoadingFailure> either, final Throwable thr) -> { +- if (thr != null) { +- loadCallback.accept(null); +- return; +- } +- loadCallback.accept(either.left().orElse(null)); +- }, (final Runnable r) -> { +- scheduleChunkTask(level, chunkX, chunkZ, r, PrioritisedExecutor.Priority.HIGHEST); +- }); ++ level.chunkTaskScheduler.scheduleTickingState(chunkX, chunkZ, toStatus, addTicket, priority, onComplete); // Paper - rewrite chunk system + } + + public static List<ChunkHolder> getVisibleChunkHolders(final ServerLevel level) { +- return new ArrayList<>(level.chunkSource.chunkMap.visibleChunkMap.values()); ++ return level.chunkTaskScheduler.chunkHolderManager.getOldChunkHolders(); // Paper - rewrite chunk system + } + + public static List<ChunkHolder> getUpdatingChunkHolders(final ServerLevel level) { +- return new ArrayList<>(level.chunkSource.chunkMap.updatingChunkMap.values()); ++ return level.chunkTaskScheduler.chunkHolderManager.getOldChunkHolders(); // Paper - rewrite chunk system + } + + public static int getVisibleChunkHolderCount(final ServerLevel level) { +- return level.chunkSource.chunkMap.visibleChunkMap.size(); ++ return level.chunkTaskScheduler.chunkHolderManager.size(); // Paper - rewrite chunk system + } + + public static int getUpdatingChunkHolderCount(final ServerLevel level) { +- return level.chunkSource.chunkMap.updatingChunkMap.size(); ++ return level.chunkTaskScheduler.chunkHolderManager.size(); // Paper - rewrite chunk system + } + + public static boolean hasAnyChunkHolders(final ServerLevel level) { +@@ -244,26 +93,31 @@ public final class ChunkSystem { + + public static void onChunkBorder(final LevelChunk chunk, final ChunkHolder holder) { + chunk.playerChunk = holder; ++ chunk.chunkStatus = net.minecraft.server.level.FullChunkStatus.FULL; + } + + public static void onChunkNotBorder(final LevelChunk chunk, final ChunkHolder holder) { +- ++ chunk.chunkStatus = net.minecraft.server.level.FullChunkStatus.INACCESSIBLE; + } + + public static void onChunkTicking(final LevelChunk chunk, final ChunkHolder holder) { + chunk.level.getChunkSource().tickingChunks.add(chunk); ++ chunk.chunkStatus = net.minecraft.server.level.FullChunkStatus.BLOCK_TICKING; + } + + public static void onChunkNotTicking(final LevelChunk chunk, final ChunkHolder holder) { + chunk.level.getChunkSource().tickingChunks.remove(chunk); ++ chunk.chunkStatus = net.minecraft.server.level.FullChunkStatus.FULL; + } + + public static void onChunkEntityTicking(final LevelChunk chunk, final ChunkHolder holder) { + chunk.level.getChunkSource().entityTickingChunks.add(chunk); ++ chunk.chunkStatus = net.minecraft.server.level.FullChunkStatus.ENTITY_TICKING; + } + + public static void onChunkNotEntityTicking(final LevelChunk chunk, final ChunkHolder holder) { + chunk.level.getChunkSource().entityTickingChunks.remove(chunk); ++ chunk.chunkStatus = net.minecraft.server.level.FullChunkStatus.BLOCK_TICKING; + } + + public static ChunkHolder getUnloadingChunkHolder(final ServerLevel level, final int chunkX, final int chunkZ) { +@@ -271,23 +125,15 @@ public final class ChunkSystem { + } + + public static int getSendViewDistance(final ServerPlayer player) { +- return getLoadViewDistance(player); ++ return io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.getAPISendViewDistance(player); + } + + public static int getLoadViewDistance(final ServerPlayer player) { +- final ServerLevel level = player.serverLevel(); +- if (level == null) { +- return Bukkit.getViewDistance(); +- } +- return level.chunkSource.chunkMap.getPlayerViewDistance(player); ++ return io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.getLoadViewDistance(player); + } + + public static int getTickViewDistance(final ServerPlayer player) { +- final ServerLevel level = player.serverLevel(); +- if (level == null) { +- return Bukkit.getSimulationDistance(); +- } +- return level.chunkSource.chunkMap.distanceManager.simulationDistance; ++ return io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.getAPITickViewDistance(player); + } + + private ChunkSystem() { +diff --git a/src/main/java/io/papermc/paper/chunk/system/RegionizedPlayerChunkLoader.java b/src/main/java/io/papermc/paper/chunk/system/RegionizedPlayerChunkLoader.java +new file mode 100644 +index 0000000000000000000000000000000000000000..ee58c67cb2bd78159cce19ec75f13dc6168a0e7a +--- /dev/null ++++ b/src/main/java/io/papermc/paper/chunk/system/RegionizedPlayerChunkLoader.java +@@ -0,0 +1,1375 @@ ++package io.papermc.paper.chunk.system; ++ ++import ca.spottedleaf.concurrentutil.collection.SRSWLinkedQueue; ++import ca.spottedleaf.concurrentutil.executor.standard.PrioritisedExecutor; ++import ca.spottedleaf.concurrentutil.util.ConcurrentUtil; ++import io.papermc.paper.chunk.system.scheduling.ChunkHolderManager; ++import io.papermc.paper.configuration.GlobalConfiguration; ++import io.papermc.paper.util.CoordinateUtils; ++import io.papermc.paper.util.TickThread; ++import io.papermc.paper.util.player.SingleUserAreaMap; ++import it.unimi.dsi.fastutil.longs.Long2ByteOpenHashMap; ++import it.unimi.dsi.fastutil.longs.LongArrayList; ++import it.unimi.dsi.fastutil.longs.LongComparator; ++import it.unimi.dsi.fastutil.longs.LongHeapPriorityQueue; ++import it.unimi.dsi.fastutil.longs.LongIterator; ++import it.unimi.dsi.fastutil.longs.LongLinkedOpenHashSet; ++import it.unimi.dsi.fastutil.longs.LongOpenHashSet; ++import net.minecraft.network.protocol.Packet; ++import net.minecraft.network.protocol.game.ClientboundSetChunkCacheCenterPacket; ++import net.minecraft.network.protocol.game.ClientboundSetChunkCacheRadiusPacket; ++import net.minecraft.network.protocol.game.ClientboundSetSimulationDistancePacket; ++import net.minecraft.server.level.ChunkTrackingView; ++import net.minecraft.server.level.ServerLevel; ++import net.minecraft.server.level.ServerPlayer; ++import net.minecraft.server.level.TicketType; ++import net.minecraft.server.network.PlayerChunkSender; ++import net.minecraft.world.level.ChunkPos; ++import net.minecraft.world.level.GameRules; ++import net.minecraft.world.level.chunk.ChunkAccess; ++import net.minecraft.world.level.chunk.status.ChunkStatus; ++import net.minecraft.world.level.chunk.LevelChunk; ++import net.minecraft.world.level.levelgen.BelowZeroRetrogen; ++import org.bukkit.craftbukkit.entity.CraftPlayer; ++import org.bukkit.entity.Player; ++import java.lang.invoke.VarHandle; ++import java.util.ArrayDeque; ++import java.util.Arrays; ++import java.util.Objects; ++import java.util.concurrent.TimeUnit; ++import java.util.concurrent.atomic.AtomicLong; ++ ++public class RegionizedPlayerChunkLoader { ++ ++ // expected that this list returns for a given radius, the set of chunks ordered ++ // by manhattan distance ++ private static final long[][] SEARCH_RADIUS_ITERATION_LIST = new long[64+2+1][]; ++ static { ++ for (int i = 0; i < SEARCH_RADIUS_ITERATION_LIST.length; ++i) { ++ // a BFS around -x, -z, +x, +z will give increasing manhatten distance ++ SEARCH_RADIUS_ITERATION_LIST[i] = generateBFSOrder(i); ++ } ++ } ++ ++ private static void expandQuadrants(final CustomLongArray input, final int size) { ++ final int len = input.size(); ++ final long[] array = input.elements(); ++ ++ int writeIndex = size - 1; ++ for (int i = len - 1; i >= 0; --i) { ++ final long key = array[i]; ++ final int chunkX = CoordinateUtils.getChunkX(key); ++ final int chunkZ = CoordinateUtils.getChunkZ(key); ++ ++ if ((chunkX | chunkZ) < 0 || (i != 0 && chunkX == 0 && chunkZ == 0)) { ++ throw new IllegalStateException(); ++ } ++ ++ // Q4 ++ if (chunkZ != 0) { ++ array[writeIndex--] = CoordinateUtils.getChunkKey(chunkX, -chunkZ); ++ } ++ // Q3 ++ if (chunkX != 0 && chunkZ != 0) { ++ array[writeIndex--] = CoordinateUtils.getChunkKey(-chunkX, -chunkZ); ++ } ++ // Q2 ++ if (chunkX != 0) { ++ array[writeIndex--] = CoordinateUtils.getChunkKey(-chunkX, chunkZ); ++ } ++ ++ array[writeIndex--] = key; ++ } ++ ++ input.forceSize(size); ++ ++ if (writeIndex != -1) { ++ throw new IllegalStateException(); ++ } ++ } ++ ++ private static long[] generateBFSOrder(final int radius) { ++ // by using only the first quadrant, we can reduce the total element size by 4 when spreading ++ final CustomLongArray[] byDistance = makeQ1BFS(radius); ++ ++ // to increase generation parallelism, we want to space the chunks out so that they are not nearby when generating ++ // this also means we are minimising locality ++ // but, we need to maintain sorted order by manhatten distance ++ ++ // per manhatten distance we transform the chunk list so that each element is maximally spaced out from each other ++ for (int i = 0, len = byDistance.length; i < len; ++i) { ++ final CustomLongArray points = byDistance[i]; ++ final int expectedSize = getDistanceSize(i, radius); ++ ++ final CustomLongArray spread = spread(points, expectedSize); ++ // add in Q2, Q3, Q4 ++ expandQuadrants(spread, expectedSize); ++ ++ byDistance[i] = spread; ++ } ++ ++ // now, rebuild the list so that it still maintains manhatten distance order ++ final CustomLongArray ret = new CustomLongArray((2 * radius + 1) * (2 * radius + 1)); ++ ++ for (final CustomLongArray dist : byDistance) { ++ ret.addAll(dist); ++ } ++ ++ return ret.elements(); ++ } ++ ++ public static final TicketType<Long> REGION_PLAYER_TICKET = TicketType.create("region_player_ticket", Long::compareTo); ++ ++ public static final int MIN_VIEW_DISTANCE = 2; ++ public static final int MAX_VIEW_DISTANCE = 32; ++ ++ public static final int TICK_TICKET_LEVEL = 31; ++ public static final int GENERATED_TICKET_LEVEL = 33 + ChunkStatus.getDistance(ChunkStatus.FULL); ++ public static final int LOADED_TICKET_LEVEL = 33 + ChunkStatus.getDistance(ChunkStatus.EMPTY); ++ ++ public static final record ViewDistances( ++ int tickViewDistance, ++ int loadViewDistance, ++ int sendViewDistance ++ ) { ++ public ViewDistances setTickViewDistance(final int distance) { ++ return new ViewDistances(distance, this.loadViewDistance, this.sendViewDistance); ++ } ++ ++ public ViewDistances setLoadViewDistance(final int distance) { ++ return new ViewDistances(this.tickViewDistance, distance, this.sendViewDistance); ++ } ++ ++ ++ public ViewDistances setSendViewDistance(final int distance) { ++ return new ViewDistances(this.tickViewDistance, this.loadViewDistance, distance); ++ } ++ } ++ ++ public static int getAPITickViewDistance(final Player player) { ++ return getAPITickViewDistance(((CraftPlayer)player).getHandle()); ++ } ++ ++ public static int getAPITickViewDistance(final ServerPlayer player) { ++ final ServerLevel level = (ServerLevel)player.level(); ++ final PlayerChunkLoaderData data = player.chunkLoader; ++ if (data == null) { ++ return level.playerChunkLoader.getAPITickDistance(); ++ } ++ return data.lastTickDistance; ++ } ++ ++ public static int getAPIViewDistance(final Player player) { ++ return getAPIViewDistance(((CraftPlayer)player).getHandle()); ++ } ++ ++ public static int getAPIViewDistance(final ServerPlayer player) { ++ final ServerLevel level = (ServerLevel)player.level(); ++ final PlayerChunkLoaderData data = player.chunkLoader; ++ if (data == null) { ++ return level.playerChunkLoader.getAPIViewDistance(); ++ } ++ // view distance = load distance + 1 ++ return data.lastLoadDistance - 1; ++ } ++ ++ public static int getLoadViewDistance(final ServerPlayer player) { ++ final ServerLevel level = (ServerLevel)player.level(); ++ final PlayerChunkLoaderData data = player.chunkLoader; ++ if (data == null) { ++ return level.playerChunkLoader.getAPIViewDistance(); ++ } ++ // view distance = load distance + 1 ++ return data.lastLoadDistance - 1; ++ } ++ ++ public static int getAPISendViewDistance(final Player player) { ++ return getAPISendViewDistance(((CraftPlayer)player).getHandle()); ++ } ++ ++ public static int getAPISendViewDistance(final ServerPlayer player) { ++ final ServerLevel level = (ServerLevel)player.level(); ++ final PlayerChunkLoaderData data = player.chunkLoader; ++ if (data == null) { ++ return level.playerChunkLoader.getAPISendViewDistance(); ++ } ++ return data.lastSendDistance; ++ } ++ ++ private final ServerLevel world; ++ ++ public RegionizedPlayerChunkLoader(final ServerLevel world) { ++ this.world = world; ++ } ++ ++ public void addPlayer(final ServerPlayer player) { ++ TickThread.ensureTickThread(player, "Cannot add player to player chunk loader async"); ++ if (!player.isRealPlayer) { ++ return; ++ } ++ ++ if (player.chunkLoader != null) { ++ throw new IllegalStateException("Player is already added to player chunk loader"); ++ } ++ ++ final PlayerChunkLoaderData loader = new PlayerChunkLoaderData(this.world, player); ++ ++ player.chunkLoader = loader; ++ loader.add(); ++ } ++ ++ public void updatePlayer(final ServerPlayer player) { ++ final PlayerChunkLoaderData loader = player.chunkLoader; ++ if (loader != null) { ++ loader.update(); ++ } ++ } ++ ++ public void removePlayer(final ServerPlayer player) { ++ TickThread.ensureTickThread(player, "Cannot remove player from player chunk loader async"); ++ if (!player.isRealPlayer) { ++ return; ++ } ++ ++ final PlayerChunkLoaderData loader = player.chunkLoader; ++ ++ if (loader == null) { ++ return; ++ } ++ ++ loader.remove(); ++ player.chunkLoader = null; ++ } ++ ++ public void setSendDistance(final int distance) { ++ this.world.setSendViewDistance(distance); ++ } ++ ++ public void setLoadDistance(final int distance) { ++ this.world.setLoadViewDistance(distance); ++ } ++ ++ public void setTickDistance(final int distance) { ++ this.world.setTickViewDistance(distance); ++ } ++ ++ // Note: follow the player chunk loader so everything stays consistent... ++ public int getAPITickDistance() { ++ final ViewDistances distances = this.world.getViewDistances(); ++ final int tickViewDistance = PlayerChunkLoaderData.getTickDistance(-1, distances.tickViewDistance); ++ return tickViewDistance; ++ } ++ ++ public int getAPIViewDistance() { ++ final ViewDistances distances = this.world.getViewDistances(); ++ final int tickViewDistance = PlayerChunkLoaderData.getTickDistance(-1, distances.tickViewDistance); ++ final int loadDistance = PlayerChunkLoaderData.getLoadViewDistance(tickViewDistance, -1, distances.loadViewDistance); ++ ++ // loadDistance = api view distance + 1 ++ return loadDistance - 1; ++ } ++ ++ public int getAPISendViewDistance() { ++ final ViewDistances distances = this.world.getViewDistances(); ++ final int tickViewDistance = PlayerChunkLoaderData.getTickDistance(-1, distances.tickViewDistance); ++ final int loadDistance = PlayerChunkLoaderData.getLoadViewDistance(tickViewDistance, -1, distances.loadViewDistance); ++ final int sendViewDistance = PlayerChunkLoaderData.getSendViewDistance( ++ loadDistance, -1, -1, distances.sendViewDistance ++ ); ++ ++ return sendViewDistance; ++ } ++ ++ public boolean isChunkSent(final ServerPlayer player, final int chunkX, final int chunkZ, final boolean borderOnly) { ++ return borderOnly ? this.isChunkSentBorderOnly(player, chunkX, chunkZ) : this.isChunkSent(player, chunkX, chunkZ); ++ } ++ ++ public boolean isChunkSent(final ServerPlayer player, final int chunkX, final int chunkZ) { ++ final PlayerChunkLoaderData loader = player.chunkLoader; ++ if (loader == null) { ++ return false; ++ } ++ ++ return loader.sentChunks.contains(CoordinateUtils.getChunkKey(chunkX, chunkZ)); ++ } ++ ++ public boolean isChunkSentBorderOnly(final ServerPlayer player, final int chunkX, final int chunkZ) { ++ final PlayerChunkLoaderData loader = player.chunkLoader; ++ if (loader == null) { ++ return false; ++ } ++ ++ for (int dz = -1; dz <= 1; ++dz) { ++ for (int dx = -1; dx <= 1; ++dx) { ++ if (!loader.sentChunks.contains(CoordinateUtils.getChunkKey(dx + chunkX, dz + chunkZ))) { ++ return true; ++ } ++ } ++ } ++ ++ return false; ++ } ++ ++ public void tick() { ++ TickThread.ensureTickThread("Cannot tick player chunk loader async"); ++ long currTime = System.nanoTime(); ++ for (final ServerPlayer player : new java.util.ArrayList<>(this.world.players())) { ++ final PlayerChunkLoaderData loader = player.chunkLoader; ++ if (loader == null || loader.world != this.world) { ++ // not our problem anymore ++ continue; ++ } ++ loader.update(); // can't invoke plugin logic ++ loader.updateQueues(currTime); ++ } ++ } ++ ++ public static final class PlayerChunkLoaderData { ++ ++ private static final AtomicLong ID_GENERATOR = new AtomicLong(); ++ private final long id = ID_GENERATOR.incrementAndGet(); ++ private final Long idBoxed = Long.valueOf(this.id); ++ ++ private static final long MAX_RATE = 10_000L; ++ ++ private final ServerPlayer player; ++ private final ServerLevel world; ++ ++ private int lastChunkX = Integer.MIN_VALUE; ++ private int lastChunkZ = Integer.MIN_VALUE; ++ ++ private int lastSendDistance = Integer.MIN_VALUE; ++ private int lastLoadDistance = Integer.MIN_VALUE; ++ private int lastTickDistance = Integer.MIN_VALUE; ++ ++ private int lastSentChunkCenterX = Integer.MIN_VALUE; ++ private int lastSentChunkCenterZ = Integer.MIN_VALUE; ++ ++ private int lastSentChunkRadius = Integer.MIN_VALUE; ++ private int lastSentSimulationDistance = Integer.MIN_VALUE; ++ ++ private boolean canGenerateChunks = true; ++ ++ private final ArrayDeque<ChunkHolderManager.TicketOperation<?, ?>> delayedTicketOps = new ArrayDeque<>(); ++ private final LongOpenHashSet sentChunks = new LongOpenHashSet(); ++ ++ private static final byte CHUNK_TICKET_STAGE_NONE = 0; ++ private static final byte CHUNK_TICKET_STAGE_LOADING = 1; ++ private static final byte CHUNK_TICKET_STAGE_LOADED = 2; ++ private static final byte CHUNK_TICKET_STAGE_GENERATING = 3; ++ private static final byte CHUNK_TICKET_STAGE_GENERATED = 4; ++ private static final byte CHUNK_TICKET_STAGE_TICK = 5; ++ private static final int[] TICKET_STAGE_TO_LEVEL = new int[] { ++ ChunkHolderManager.MAX_TICKET_LEVEL + 1, ++ LOADED_TICKET_LEVEL, ++ LOADED_TICKET_LEVEL, ++ GENERATED_TICKET_LEVEL, ++ GENERATED_TICKET_LEVEL, ++ TICK_TICKET_LEVEL ++ }; ++ private final Long2ByteOpenHashMap chunkTicketStage = new Long2ByteOpenHashMap(); ++ { ++ this.chunkTicketStage.defaultReturnValue(CHUNK_TICKET_STAGE_NONE); ++ } ++ ++ // rate limiting ++ private final AllocatingRateLimiter chunkSendLimiter = new AllocatingRateLimiter(); ++ private final AllocatingRateLimiter chunkLoadTicketLimiter = new AllocatingRateLimiter(); ++ private final AllocatingRateLimiter chunkGenerateTicketLimiter = new AllocatingRateLimiter(); ++ ++ // queues ++ private final LongComparator CLOSEST_MANHATTAN_DIST = (final long c1, final long c2) -> { ++ final int c1x = CoordinateUtils.getChunkX(c1); ++ final int c1z = CoordinateUtils.getChunkZ(c1); ++ ++ final int c2x = CoordinateUtils.getChunkX(c2); ++ final int c2z = CoordinateUtils.getChunkZ(c2); ++ ++ final int centerX = PlayerChunkLoaderData.this.lastChunkX; ++ final int centerZ = PlayerChunkLoaderData.this.lastChunkZ; ++ ++ return Integer.compare( ++ Math.abs(c1x - centerX) + Math.abs(c1z - centerZ), ++ Math.abs(c2x - centerX) + Math.abs(c2z - centerZ) ++ ); ++ }; ++ private final LongHeapPriorityQueue sendQueue = new LongHeapPriorityQueue(CLOSEST_MANHATTAN_DIST); ++ private final LongHeapPriorityQueue tickingQueue = new LongHeapPriorityQueue(CLOSEST_MANHATTAN_DIST); ++ private final LongHeapPriorityQueue generatingQueue = new LongHeapPriorityQueue(CLOSEST_MANHATTAN_DIST); ++ private final LongHeapPriorityQueue genQueue = new LongHeapPriorityQueue(CLOSEST_MANHATTAN_DIST); ++ private final LongHeapPriorityQueue loadingQueue = new LongHeapPriorityQueue(CLOSEST_MANHATTAN_DIST); ++ private final LongHeapPriorityQueue loadQueue = new LongHeapPriorityQueue(CLOSEST_MANHATTAN_DIST); ++ ++ private volatile boolean removed; ++ ++ public PlayerChunkLoaderData(final ServerLevel world, final ServerPlayer player) { ++ this.world = world; ++ this.player = player; ++ } ++ ++ private void flushDelayedTicketOps() { ++ if (this.delayedTicketOps.isEmpty()) { ++ return; ++ } ++ this.world.chunkTaskScheduler.chunkHolderManager.performTicketUpdates(this.delayedTicketOps); ++ this.delayedTicketOps.clear(); ++ } ++ ++ private void pushDelayedTicketOp(final ChunkHolderManager.TicketOperation<?, ?> op) { ++ this.delayedTicketOps.addLast(op); ++ } ++ ++ private void sendChunk(final int chunkX, final int chunkZ) { ++ if (this.sentChunks.add(CoordinateUtils.getChunkKey(chunkX, chunkZ))) { ++ PlayerChunkSender.sendChunk(this.player.connection, this.world, this.world.getChunkIfLoaded(chunkX, chunkZ)); ++ return; ++ } ++ throw new IllegalStateException(); ++ } ++ ++ private void sendUnloadChunk(final int chunkX, final int chunkZ) { ++ if (!this.sentChunks.remove(CoordinateUtils.getChunkKey(chunkX, chunkZ))) { ++ return; ++ } ++ this.sendUnloadChunkRaw(chunkX, chunkZ); ++ } ++ ++ private void sendUnloadChunkRaw(final int chunkX, final int chunkZ) { ++ PlayerChunkSender.dropChunkStatic(this.player, new ChunkPos(chunkX, chunkZ)); ++ } ++ ++ private final SingleUserAreaMap<PlayerChunkLoaderData> broadcastMap = new SingleUserAreaMap<>(this) { ++ @Override ++ protected void addCallback(final PlayerChunkLoaderData parameter, final int chunkX, final int chunkZ) { ++ // do nothing, we only care about remove ++ } ++ ++ @Override ++ protected void removeCallback(final PlayerChunkLoaderData parameter, final int chunkX, final int chunkZ) { ++ parameter.sendUnloadChunk(chunkX, chunkZ); ++ } ++ }; ++ private final SingleUserAreaMap<io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.PlayerChunkLoaderData> loadTicketCleanup = new SingleUserAreaMap<>(this) { ++ @Override ++ protected void addCallback(final PlayerChunkLoaderData parameter, final int chunkX, final int chunkZ) { ++ // do nothing, we only care about remove ++ } ++ ++ @Override ++ protected void removeCallback(final PlayerChunkLoaderData parameter, final int chunkX, final int chunkZ) { ++ final long chunk = CoordinateUtils.getChunkKey(chunkX, chunkZ); ++ final byte ticketStage = parameter.chunkTicketStage.remove(chunk); ++ final int level = TICKET_STAGE_TO_LEVEL[ticketStage]; ++ if (level > ChunkHolderManager.MAX_TICKET_LEVEL) { ++ return; ++ } ++ ++ parameter.pushDelayedTicketOp(ChunkHolderManager.TicketOperation.addAndRemove( ++ chunk, ++ TicketType.UNKNOWN, level, new ChunkPos(chunkX, chunkZ), ++ REGION_PLAYER_TICKET, level, parameter.idBoxed ++ )); ++ } ++ }; ++ private final SingleUserAreaMap<PlayerChunkLoaderData> tickMap = new SingleUserAreaMap<>(this) { ++ @Override ++ protected void addCallback(final PlayerChunkLoaderData parameter, final int chunkX, final int chunkZ) { ++ // do nothing, we will detect ticking chunks when we try to load them ++ } ++ ++ @Override ++ protected void removeCallback(final PlayerChunkLoaderData parameter, final int chunkX, final int chunkZ) { ++ final long chunk = CoordinateUtils.getChunkKey(chunkX, chunkZ); ++ // note: by the time this is called, the tick cleanup should have ran - so, if the chunk is at ++ // the tick stage it was deemed in range for loading. Thus, we need to move it to generated ++ if (!parameter.chunkTicketStage.replace(chunk, CHUNK_TICKET_STAGE_TICK, CHUNK_TICKET_STAGE_GENERATED)) { ++ return; ++ } ++ ++ // Since we are possibly downgrading the ticket level, we add an unknown ticket so that ++ // the level is kept until tick(). ++ parameter.pushDelayedTicketOp(ChunkHolderManager.TicketOperation.addAndRemove( ++ chunk, ++ TicketType.UNKNOWN, TICK_TICKET_LEVEL, new ChunkPos(chunkX, chunkZ), ++ REGION_PLAYER_TICKET, TICK_TICKET_LEVEL, parameter.idBoxed ++ )); ++ // keep chunk at new generated level ++ parameter.pushDelayedTicketOp(ChunkHolderManager.TicketOperation.addOp( ++ chunk, ++ REGION_PLAYER_TICKET, GENERATED_TICKET_LEVEL, parameter.idBoxed ++ )); ++ } ++ }; ++ ++ private static boolean wantChunkLoaded(final int centerX, final int centerZ, final int chunkX, final int chunkZ, ++ final int sendRadius) { ++ // expect sendRadius to be = 1 + target viewable radius ++ return ChunkTrackingView.isWithinDistance(centerX, centerZ, sendRadius, chunkX, chunkZ, true); ++ } ++ ++ private static int getClientViewDistance(final ServerPlayer player) { ++ final Integer vd = player.requestedViewDistance(); ++ return vd == null ? -1 : Math.max(0, vd.intValue()); ++ } ++ ++ private static int getTickDistance(final int playerTickViewDistance, final int worldTickViewDistance) { ++ return playerTickViewDistance < 0 ? worldTickViewDistance : playerTickViewDistance; ++ } ++ ++ private static int getLoadViewDistance(final int tickViewDistance, final int playerLoadViewDistance, ++ final int worldLoadViewDistance) { ++ return Math.max(tickViewDistance + 1, playerLoadViewDistance < 0 ? worldLoadViewDistance : playerLoadViewDistance); ++ } ++ ++ private static int getSendViewDistance(final int loadViewDistance, final int clientViewDistance, ++ final int playerSendViewDistance, final int worldSendViewDistance) { ++ return Math.min( ++ loadViewDistance - 1, ++ playerSendViewDistance < 0 ? (!GlobalConfiguration.get().chunkLoadingAdvanced.autoConfigSendDistance || clientViewDistance < 0 ? (worldSendViewDistance < 0 ? (loadViewDistance - 1) : worldSendViewDistance) : clientViewDistance + 1) : playerSendViewDistance ++ ); ++ } ++ ++ private Packet<?> updateClientChunkRadius(final int radius) { ++ this.lastSentChunkRadius = radius; ++ return new ClientboundSetChunkCacheRadiusPacket(radius); ++ } ++ ++ private Packet<?> updateClientSimulationDistance(final int distance) { ++ this.lastSentSimulationDistance = distance; ++ return new ClientboundSetSimulationDistancePacket(distance); ++ } ++ ++ private Packet<?> updateClientChunkCenter(final int chunkX, final int chunkZ) { ++ this.lastSentChunkCenterX = chunkX; ++ this.lastSentChunkCenterZ = chunkZ; ++ return new ClientboundSetChunkCacheCenterPacket(chunkX, chunkZ); ++ } ++ ++ private boolean canPlayerGenerateChunks() { ++ return !this.player.isSpectator() || this.world.getGameRules().getBoolean(GameRules.RULE_SPECTATORSGENERATECHUNKS); ++ } ++ ++ private double getMaxChunkLoadRate() { ++ final double configRate = GlobalConfiguration.get().chunkLoadingBasic.playerMaxChunkLoadRate; ++ ++ return configRate < 0.0 || configRate > (double)MAX_RATE ? (double)MAX_RATE : Math.max(1.0, configRate); ++ } ++ ++ private double getMaxChunkGenRate() { ++ final double configRate = GlobalConfiguration.get().chunkLoadingBasic.playerMaxChunkGenerateRate; ++ ++ return configRate < 0.0 || configRate > (double)MAX_RATE ? (double)MAX_RATE : Math.max(1.0, configRate); ++ } ++ ++ private double getMaxChunkSendRate() { ++ final double configRate = GlobalConfiguration.get().chunkLoadingBasic.playerMaxChunkSendRate; ++ ++ return configRate < 0.0 || configRate > (double)MAX_RATE ? (double)MAX_RATE : Math.max(1.0, configRate); ++ } ++ ++ private long getMaxChunkLoads() { ++ final long radiusChunks = (2L * this.lastLoadDistance + 1L) * (2L * this.lastLoadDistance + 1L); ++ long configLimit = GlobalConfiguration.get().chunkLoadingAdvanced.playerMaxConcurrentChunkLoads; ++ if (configLimit == 0L) { ++ // by default, only allow 1/5th of the chunks in the view distance to be concurrently active ++ configLimit = Math.max(5L, radiusChunks / 5L); ++ } else if (configLimit < 0L) { ++ configLimit = Integer.MAX_VALUE; ++ } // else: use the value configured ++ configLimit = configLimit - this.loadingQueue.size(); ++ ++ return configLimit; ++ } ++ ++ private long getMaxChunkGenerates() { ++ final long radiusChunks = (2L * this.lastLoadDistance + 1L) * (2L * this.lastLoadDistance + 1L); ++ long configLimit = GlobalConfiguration.get().chunkLoadingAdvanced.playerMaxConcurrentChunkGenerates; ++ if (configLimit == 0L) { ++ // by default, only allow 1/5th of the chunks in the view distance to be concurrently active ++ configLimit = Math.max(5L, radiusChunks / 5L); ++ } else if (configLimit < 0L) { ++ configLimit = Integer.MAX_VALUE; ++ } // else: use the value configured ++ configLimit = configLimit - this.generatingQueue.size(); ++ ++ return configLimit; ++ } ++ ++ private boolean wantChunkSent(final int chunkX, final int chunkZ) { ++ final int dx = this.lastChunkX - chunkX; ++ final int dz = this.lastChunkZ - chunkZ; ++ return (Math.max(Math.abs(dx), Math.abs(dz)) <= (this.lastSendDistance + 1)) && wantChunkLoaded( ++ this.lastChunkX, this.lastChunkZ, chunkX, chunkZ, this.lastSendDistance ++ ); ++ } ++ ++ private boolean wantChunkTicked(final int chunkX, final int chunkZ) { ++ final int dx = this.lastChunkX - chunkX; ++ final int dz = this.lastChunkZ - chunkZ; ++ return Math.max(Math.abs(dx), Math.abs(dz)) <= this.lastTickDistance; ++ } ++ ++ void updateQueues(final long time) { ++ TickThread.ensureTickThread(this.player, "Cannot tick player chunk loader async"); ++ if (this.removed) { ++ throw new IllegalStateException("Ticking removed player chunk loader"); ++ } ++ // update rate limits ++ final double loadRate = this.getMaxChunkLoadRate(); ++ final double genRate = this.getMaxChunkGenRate(); ++ final double sendRate = this.getMaxChunkSendRate(); ++ ++ this.chunkLoadTicketLimiter.tickAllocation(time, loadRate, loadRate); ++ this.chunkGenerateTicketLimiter.tickAllocation(time, genRate, genRate); ++ this.chunkSendLimiter.tickAllocation(time, sendRate, sendRate); ++ ++ // try to progress chunk loads ++ while (!this.loadingQueue.isEmpty()) { ++ final long pendingLoadChunk = this.loadingQueue.firstLong(); ++ final int pendingChunkX = CoordinateUtils.getChunkX(pendingLoadChunk); ++ final int pendingChunkZ = CoordinateUtils.getChunkZ(pendingLoadChunk); ++ final ChunkAccess pending = this.world.chunkSource.getChunkAtImmediately(pendingChunkX, pendingChunkZ); ++ if (pending == null) { ++ // nothing to do here ++ break; ++ } ++ // chunk has loaded, so we can take it out of the queue ++ this.loadingQueue.dequeueLong(); ++ ++ // try to move to generate queue ++ final byte prev = this.chunkTicketStage.put(pendingLoadChunk, CHUNK_TICKET_STAGE_LOADED); ++ if (prev != CHUNK_TICKET_STAGE_LOADING) { ++ throw new IllegalStateException("Previous state should be " + CHUNK_TICKET_STAGE_LOADING + ", not " + prev); ++ } ++ ++ if (this.canGenerateChunks || this.isLoadedChunkGeneratable(pending)) { ++ this.genQueue.enqueue(pendingLoadChunk); ++ } // else: don't want to generate, so just leave it loaded ++ } ++ ++ // try to push more chunk loads ++ final long maxLoads = Math.max(0L, Math.min(MAX_RATE, Math.min(this.loadQueue.size(), this.getMaxChunkLoads()))); ++ final int maxLoadsThisTick = (int)this.chunkLoadTicketLimiter.takeAllocation(time, loadRate, maxLoads); ++ if (maxLoadsThisTick > 0) { ++ final LongArrayList chunks = new LongArrayList(maxLoadsThisTick); ++ for (int i = 0; i < maxLoadsThisTick; ++i) { ++ final long chunk = this.loadQueue.dequeueLong(); ++ final byte prev = this.chunkTicketStage.put(chunk, CHUNK_TICKET_STAGE_LOADING); ++ if (prev != CHUNK_TICKET_STAGE_NONE) { ++ throw new IllegalStateException("Previous state should be " + CHUNK_TICKET_STAGE_NONE + ", not " + prev); ++ } ++ this.pushDelayedTicketOp( ++ ChunkHolderManager.TicketOperation.addOp( ++ chunk, ++ REGION_PLAYER_TICKET, LOADED_TICKET_LEVEL, this.idBoxed ++ ) ++ ); ++ chunks.add(chunk); ++ this.loadingQueue.enqueue(chunk); ++ } ++ ++ // here we need to flush tickets, as scheduleChunkLoad requires tickets to be propagated with addTicket = false ++ this.flushDelayedTicketOps(); ++ // we only need to call scheduleChunkLoad because the loaded ticket level is not enough to start the chunk ++ // load - only generate ticket levels start anything, but they start generation... ++ // propagate levels ++ // Note: this CAN call plugin logic, so it is VITAL that our bookkeeping logic is completely done by the time this is invoked ++ this.world.chunkTaskScheduler.chunkHolderManager.processTicketUpdates(); ++ ++ if (this.removed) { ++ // process ticket updates may invoke plugin logic, which may remove this player ++ return; ++ } ++ ++ for (int i = 0; i < maxLoadsThisTick; ++i) { ++ final long queuedLoadChunk = chunks.getLong(i); ++ final int queuedChunkX = CoordinateUtils.getChunkX(queuedLoadChunk); ++ final int queuedChunkZ = CoordinateUtils.getChunkZ(queuedLoadChunk); ++ this.world.chunkTaskScheduler.scheduleChunkLoad( ++ queuedChunkX, queuedChunkZ, ChunkStatus.EMPTY, false, PrioritisedExecutor.Priority.NORMAL, null ++ ); ++ if (this.removed) { ++ return; ++ } ++ } ++ } ++ ++ // try to progress chunk generations ++ while (!this.generatingQueue.isEmpty()) { ++ final long pendingGenChunk = this.generatingQueue.firstLong(); ++ final int pendingChunkX = CoordinateUtils.getChunkX(pendingGenChunk); ++ final int pendingChunkZ = CoordinateUtils.getChunkZ(pendingGenChunk); ++ final LevelChunk pending = this.world.chunkSource.getChunkAtIfLoadedMainThreadNoCache(pendingChunkX, pendingChunkZ); ++ if (pending == null) { ++ // nothing to do here ++ break; ++ } ++ ++ // chunk has generated, so we can take it out of queue ++ this.generatingQueue.dequeueLong(); ++ ++ final byte prev = this.chunkTicketStage.put(pendingGenChunk, CHUNK_TICKET_STAGE_GENERATED); ++ if (prev != CHUNK_TICKET_STAGE_GENERATING) { ++ throw new IllegalStateException("Previous state should be " + CHUNK_TICKET_STAGE_GENERATING + ", not " + prev); ++ } ++ ++ // try to move to send queue ++ if (this.wantChunkSent(pendingChunkX, pendingChunkZ)) { ++ this.sendQueue.enqueue(pendingGenChunk); ++ } ++ // try to move to tick queue ++ if (this.wantChunkTicked(pendingChunkX, pendingChunkZ)) { ++ this.tickingQueue.enqueue(pendingGenChunk); ++ } ++ } ++ ++ // try to push more chunk generations ++ final long maxGens = Math.max(0L, Math.min(MAX_RATE, Math.min(this.genQueue.size(), this.getMaxChunkGenerates()))); ++ final int maxGensThisTick = (int)this.chunkGenerateTicketLimiter.takeAllocation(time, genRate, maxGens); ++ int ratedGensThisTick = 0; ++ while (!this.genQueue.isEmpty()) { ++ final long chunkKey = this.genQueue.firstLong(); ++ final int chunkX = CoordinateUtils.getChunkX(chunkKey); ++ final int chunkZ = CoordinateUtils.getChunkZ(chunkKey); ++ final ChunkAccess chunk = this.world.chunkSource.getChunkAtImmediately(chunkX, chunkZ); ++ if (chunk.getStatus() != ChunkStatus.FULL) { ++ // only rate limit actual generations ++ if ((ratedGensThisTick + 1) > maxGensThisTick) { ++ break; ++ } ++ ++ratedGensThisTick; ++ } ++ ++ this.genQueue.dequeueLong(); ++ ++ final byte prev = this.chunkTicketStage.put(chunkKey, CHUNK_TICKET_STAGE_GENERATING); ++ if (prev != CHUNK_TICKET_STAGE_LOADED) { ++ throw new IllegalStateException("Previous state should be " + CHUNK_TICKET_STAGE_LOADED + ", not " + prev); ++ } ++ this.pushDelayedTicketOp( ++ ChunkHolderManager.TicketOperation.addAndRemove( ++ chunkKey, ++ REGION_PLAYER_TICKET, GENERATED_TICKET_LEVEL, this.idBoxed, ++ REGION_PLAYER_TICKET, LOADED_TICKET_LEVEL, this.idBoxed ++ ) ++ ); ++ this.generatingQueue.enqueue(chunkKey); ++ } ++ ++ // try to pull ticking chunks ++ tick_check_outer: ++ while (!this.tickingQueue.isEmpty()) { ++ final long pendingTicking = this.tickingQueue.firstLong(); ++ final int pendingChunkX = CoordinateUtils.getChunkX(pendingTicking); ++ final int pendingChunkZ = CoordinateUtils.getChunkZ(pendingTicking); ++ ++ final int tickingReq = 2; ++ for (int dz = -tickingReq; dz <= tickingReq; ++dz) { ++ for (int dx = -tickingReq; dx <= tickingReq; ++dx) { ++ if ((dx | dz) == 0) { ++ continue; ++ } ++ final long neighbour = CoordinateUtils.getChunkKey(dx + pendingChunkX, dz + pendingChunkZ); ++ final byte stage = this.chunkTicketStage.get(neighbour); ++ if (stage != CHUNK_TICKET_STAGE_GENERATED && stage != CHUNK_TICKET_STAGE_TICK) { ++ break tick_check_outer; ++ } ++ } ++ } ++ // only gets here if all neighbours were marked as generated or ticking themselves ++ this.tickingQueue.dequeueLong(); ++ this.pushDelayedTicketOp( ++ ChunkHolderManager.TicketOperation.addAndRemove( ++ pendingTicking, ++ REGION_PLAYER_TICKET, TICK_TICKET_LEVEL, this.idBoxed, ++ REGION_PLAYER_TICKET, GENERATED_TICKET_LEVEL, this.idBoxed ++ ) ++ ); ++ // there is no queue to add after ticking ++ final byte prev = this.chunkTicketStage.put(pendingTicking, CHUNK_TICKET_STAGE_TICK); ++ if (prev != CHUNK_TICKET_STAGE_GENERATED) { ++ throw new IllegalStateException("Previous state should be " + CHUNK_TICKET_STAGE_GENERATED + ", not " + prev); ++ } ++ } ++ ++ // try to pull sending chunks ++ final long maxSends = Math.max(0L, Math.min(MAX_RATE, Integer.MAX_VALUE)); // no logic to track concurrent sends ++ final int maxSendsThisTick = Math.min((int)this.chunkSendLimiter.takeAllocation(time, sendRate, maxSends), this.sendQueue.size()); ++ // we do not return sends that we took from the allocation back because we want to limit the max send rate, not target it ++ for (int i = 0; i < maxSendsThisTick; ++i) { ++ final long pendingSend = this.sendQueue.firstLong(); ++ final int pendingSendX = CoordinateUtils.getChunkX(pendingSend); ++ final int pendingSendZ = CoordinateUtils.getChunkZ(pendingSend); ++ final LevelChunk chunk = this.world.chunkSource.getChunkAtIfLoadedMainThreadNoCache(pendingSendX, pendingSendZ); ++ if (!chunk.areNeighboursLoaded(1) || !TickThread.isTickThreadFor(this.world, pendingSendX, pendingSendZ)) { ++ // nothing to do ++ // the target chunk may not be owned by this region, but this should be resolved in the future ++ break; ++ } ++ if (!chunk.isPostProcessingDone) { ++ // not yet post-processed, need to do this so that tile entities can properly be sent to clients ++ chunk.postProcessGeneration(); ++ // check if there was any recursive action ++ if (this.removed || this.sendQueue.isEmpty() || this.sendQueue.firstLong() != pendingSend) { ++ return; ++ } // else: good to dequeue and send, fall through ++ } ++ this.sendQueue.dequeueLong(); ++ ++ this.sendChunk(pendingSendX, pendingSendZ); ++ if (this.removed) { ++ // sendChunk may invoke plugin logic ++ return; ++ } ++ } ++ ++ this.flushDelayedTicketOps(); ++ // we assume propagate ticket levels happens after this call ++ } ++ ++ void add() { ++ TickThread.ensureTickThread(this.player, "Cannot add player asynchronously"); ++ if (this.removed) { ++ throw new IllegalStateException("Adding removed player chunk loader"); ++ } ++ final ViewDistances playerDistances = this.player.getViewDistances(); ++ final ViewDistances worldDistances = this.world.getViewDistances(); ++ final int chunkX = this.player.chunkPosition().x; ++ final int chunkZ = this.player.chunkPosition().z; ++ ++ final int tickViewDistance = getTickDistance(playerDistances.tickViewDistance, worldDistances.tickViewDistance); ++ // load view cannot be less-than tick view + 1 ++ final int loadViewDistance = getLoadViewDistance(tickViewDistance, playerDistances.loadViewDistance, worldDistances.loadViewDistance); ++ // send view cannot be greater-than load view ++ final int clientViewDistance = getClientViewDistance(this.player); ++ final int sendViewDistance = getSendViewDistance(loadViewDistance, clientViewDistance, playerDistances.sendViewDistance, worldDistances.sendViewDistance); ++ ++ // send view distances ++ this.player.connection.send(this.updateClientChunkRadius(sendViewDistance)); ++ this.player.connection.send(this.updateClientSimulationDistance(tickViewDistance)); ++ ++ // add to distance maps ++ this.broadcastMap.add(chunkX, chunkZ, sendViewDistance + 1); ++ this.loadTicketCleanup.add(chunkX, chunkZ, loadViewDistance + 1); ++ this.tickMap.add(chunkX, chunkZ, tickViewDistance); ++ ++ // update chunk center ++ this.player.connection.send(this.updateClientChunkCenter(chunkX, chunkZ)); ++ ++ // now we can update ++ this.update(); ++ } ++ ++ private boolean isLoadedChunkGeneratable(final int chunkX, final int chunkZ) { ++ return this.isLoadedChunkGeneratable(this.world.chunkSource.getChunkAtImmediately(chunkX, chunkZ)); ++ } ++ ++ private boolean isLoadedChunkGeneratable(final ChunkAccess chunkAccess) { ++ final BelowZeroRetrogen belowZeroRetrogen; ++ // see PortalForcer#findPortalAround ++ return chunkAccess != null && ( ++ chunkAccess.getStatus() == ChunkStatus.FULL || ++ ((belowZeroRetrogen = chunkAccess.getBelowZeroRetrogen()) != null && belowZeroRetrogen.targetStatus().isOrAfter(ChunkStatus.SPAWN)) ++ ); ++ } ++ ++ void update() { ++ TickThread.ensureTickThread(this.player, "Cannot update player asynchronously"); ++ if (this.removed) { ++ throw new IllegalStateException("Updating removed player chunk loader"); ++ } ++ final ViewDistances playerDistances = this.player.getViewDistances(); ++ final ViewDistances worldDistances = this.world.getViewDistances(); ++ ++ final int tickViewDistance = getTickDistance(playerDistances.tickViewDistance, worldDistances.tickViewDistance); ++ // load view cannot be less-than tick view + 1 ++ final int loadViewDistance = getLoadViewDistance(tickViewDistance, playerDistances.loadViewDistance, worldDistances.loadViewDistance); ++ // send view cannot be greater-than load view ++ final int clientViewDistance = getClientViewDistance(this.player); ++ final int sendViewDistance = getSendViewDistance(loadViewDistance, clientViewDistance, playerDistances.sendViewDistance, worldDistances.sendViewDistance); ++ ++ final ChunkPos playerPos = this.player.chunkPosition(); ++ final boolean canGenerateChunks = this.canPlayerGenerateChunks(); ++ final int currentChunkX = playerPos.x; ++ final int currentChunkZ = playerPos.z; ++ ++ final int prevChunkX = this.lastChunkX; ++ final int prevChunkZ = this.lastChunkZ; ++ ++ if ( ++ // has view distance stayed the same? ++ sendViewDistance == this.lastSendDistance ++ && loadViewDistance == this.lastLoadDistance ++ && tickViewDistance == this.lastTickDistance ++ ++ // has our chunk stayed the same? ++ && prevChunkX == currentChunkX ++ && prevChunkZ == currentChunkZ ++ ++ // can we still generate chunks? ++ && this.canGenerateChunks == canGenerateChunks ++ ) { ++ // nothing we care about changed, so we're not re-calculating ++ return; ++ } ++ ++ // update distance maps ++ this.broadcastMap.update(currentChunkX, currentChunkZ, sendViewDistance + 1); ++ this.loadTicketCleanup.update(currentChunkX, currentChunkZ, loadViewDistance + 1); ++ this.tickMap.update(currentChunkX, currentChunkZ, tickViewDistance); ++ if (sendViewDistance > loadViewDistance || tickViewDistance > loadViewDistance) { ++ throw new IllegalStateException(); ++ } ++ ++ // update VDs for client ++ // this should be after the distance map updates, as they will send unload packets ++ if (this.lastSentChunkRadius != sendViewDistance) { ++ this.player.connection.send(this.updateClientChunkRadius(sendViewDistance)); ++ } ++ if (this.lastSentSimulationDistance != tickViewDistance) { ++ this.player.connection.send(this.updateClientSimulationDistance(tickViewDistance)); ++ } ++ ++ this.sendQueue.clear(); ++ this.tickingQueue.clear(); ++ this.generatingQueue.clear(); ++ this.genQueue.clear(); ++ this.loadingQueue.clear(); ++ this.loadQueue.clear(); ++ ++ this.lastChunkX = currentChunkX; ++ this.lastChunkZ = currentChunkZ; ++ this.lastSendDistance = sendViewDistance; ++ this.lastLoadDistance = loadViewDistance; ++ this.lastTickDistance = tickViewDistance; ++ this.canGenerateChunks = canGenerateChunks; ++ ++ // +1 since we need to load chunks +1 around the load view distance... ++ final long[] toIterate = SEARCH_RADIUS_ITERATION_LIST[loadViewDistance + 1]; ++ // the iteration order is by increasing manhattan distance - so, we do NOT need to ++ // sort anything in the queue! ++ for (final long deltaChunk : toIterate) { ++ final int dx = CoordinateUtils.getChunkX(deltaChunk); ++ final int dz = CoordinateUtils.getChunkZ(deltaChunk); ++ final int chunkX = dx + currentChunkX; ++ final int chunkZ = dz + currentChunkZ; ++ final long chunk = CoordinateUtils.getChunkKey(chunkX, chunkZ); ++ final int squareDistance = Math.max(Math.abs(dx), Math.abs(dz)); ++ final int manhattanDistance = Math.abs(dx) + Math.abs(dz); ++ ++ // since chunk sending is not by radius alone, we need an extra check here to account for ++ // everything <= sendDistance ++ // Note: Vanilla may want to send chunks outside the send view distance, so we do need ++ // the dist <= view check ++ final boolean sendChunk = (squareDistance <= (sendViewDistance + 1)) ++ && wantChunkLoaded(currentChunkX, currentChunkZ, chunkX, chunkZ, sendViewDistance); ++ final boolean sentChunk = sendChunk ? this.sentChunks.contains(chunk) : this.sentChunks.remove(chunk); ++ ++ if (!sendChunk && sentChunk) { ++ // have sent the chunk, but don't want it anymore ++ // unload it now ++ this.sendUnloadChunkRaw(chunkX, chunkZ); ++ } ++ ++ final byte stage = this.chunkTicketStage.get(chunk); ++ switch (stage) { ++ case CHUNK_TICKET_STAGE_NONE: { ++ // we want the chunk to be at least loaded ++ this.loadQueue.enqueue(chunk); ++ break; ++ } ++ case CHUNK_TICKET_STAGE_LOADING: { ++ this.loadingQueue.enqueue(chunk); ++ break; ++ } ++ case CHUNK_TICKET_STAGE_LOADED: { ++ if (canGenerateChunks || this.isLoadedChunkGeneratable(chunkX, chunkZ)) { ++ this.genQueue.enqueue(chunk); ++ } ++ break; ++ } ++ case CHUNK_TICKET_STAGE_GENERATING: { ++ this.generatingQueue.enqueue(chunk); ++ break; ++ } ++ case CHUNK_TICKET_STAGE_GENERATED: { ++ if (sendChunk && !sentChunk) { ++ this.sendQueue.enqueue(chunk); ++ } ++ if (squareDistance <= tickViewDistance) { ++ this.tickingQueue.enqueue(chunk); ++ } ++ break; ++ } ++ case CHUNK_TICKET_STAGE_TICK: { ++ if (sendChunk && !sentChunk) { ++ this.sendQueue.enqueue(chunk); ++ } ++ break; ++ } ++ default: { ++ throw new IllegalStateException("Unknown stage: " + stage); ++ } ++ } ++ } ++ ++ // update the chunk center ++ // this must be done last so that the client does not ignore any of our unload chunk packets above ++ if (this.lastSentChunkCenterX != currentChunkX || this.lastSentChunkCenterZ != currentChunkZ) { ++ this.player.connection.send(this.updateClientChunkCenter(currentChunkX, currentChunkZ)); ++ } ++ ++ this.flushDelayedTicketOps(); ++ } ++ ++ void remove() { ++ TickThread.ensureTickThread(this.player, "Cannot add player asynchronously"); ++ if (this.removed) { ++ throw new IllegalStateException("Removing removed player chunk loader"); ++ } ++ this.removed = true; ++ // sends the chunk unload packets ++ this.broadcastMap.remove(); ++ // cleans up loading/generating tickets ++ this.loadTicketCleanup.remove(); ++ // cleans up ticking tickets ++ this.tickMap.remove(); ++ ++ // purge queues ++ this.sendQueue.clear(); ++ this.tickingQueue.clear(); ++ this.generatingQueue.clear(); ++ this.genQueue.clear(); ++ this.loadingQueue.clear(); ++ this.loadQueue.clear(); ++ ++ // flush ticket changes ++ this.flushDelayedTicketOps(); ++ ++ // now all tickets should be removed, which is all of our external state ++ } ++ } ++ ++ // TODO rebase into util patch ++ private static final class AllocatingRateLimiter { ++ ++ // max difference granularity in ns ++ private static final long MAX_GRANULARITY = TimeUnit.SECONDS.toNanos(1L); ++ ++ private double allocation; ++ private long lastAllocationUpdate; ++ private double takeCarry; ++ private long lastTakeUpdate; ++ ++ // rate in units/s, and time in ns ++ public void tickAllocation(final long time, final double rate, final double maxAllocation) { ++ final long diff = Math.min(MAX_GRANULARITY, time - this.lastAllocationUpdate); ++ this.lastAllocationUpdate = time; ++ ++ this.allocation = Math.min(maxAllocation - this.takeCarry, this.allocation + rate * (diff*1.0E-9D)); ++ } ++ ++ // rate in units/s, and time in ns ++ public long takeAllocation(final long time, final double rate, final long maxTake) { ++ if (maxTake < 1L) { ++ return 0L; ++ } ++ ++ double ret = this.takeCarry; ++ final long diff = Math.min(MAX_GRANULARITY, time - this.lastTakeUpdate); ++ this.lastTakeUpdate = time; ++ ++ // note: abs(takeCarry) <= 1.0 ++ final double take = Math.min(Math.min((double)maxTake - this.takeCarry, this.allocation), rate * (diff*1.0E-9)); ++ ++ ret += take; ++ this.allocation -= take; ++ ++ final long retInteger = (long)Math.floor(ret); ++ this.takeCarry = ret - (double)retInteger; ++ ++ return retInteger; ++ } ++ } ++ ++ static final class CountedSRSWLinkedQueue<E> { ++ ++ private final SRSWLinkedQueue<E> queue = new SRSWLinkedQueue<>(); ++ private volatile long countAdded; ++ private volatile long countRemoved; ++ ++ private static final VarHandle COUNT_ADDED_HANDLE = ConcurrentUtil.getVarHandle(CountedSRSWLinkedQueue.class, "countAdded", long.class); ++ private static final VarHandle COUNT_REMOVED_HANDLE = ConcurrentUtil.getVarHandle(CountedSRSWLinkedQueue.class, "countRemoved", long.class); ++ ++ private long getCountAddedPlain() { ++ return (long)COUNT_ADDED_HANDLE.get(this); ++ } ++ ++ private long getCountAddedAcquire() { ++ return (long)COUNT_ADDED_HANDLE.getAcquire(this); ++ } ++ ++ private void setCountAddedRelease(final long to) { ++ COUNT_ADDED_HANDLE.setRelease(this, to); ++ } ++ ++ private long getCountRemovedPlain() { ++ return (long)COUNT_REMOVED_HANDLE.get(this); ++ } ++ ++ private long getCountRemovedAcquire() { ++ return (long)COUNT_REMOVED_HANDLE.getAcquire(this); ++ } ++ ++ private void setCountRemovedRelease(final long to) { ++ COUNT_REMOVED_HANDLE.setRelease(this, to); ++ } ++ ++ public void add(final E element) { ++ this.setCountAddedRelease(this.getCountAddedPlain() + 1L); ++ this.queue.addLast(element); ++ } ++ ++ public E poll() { ++ final E ret = this.queue.poll(); ++ if (ret != null) { ++ this.setCountRemovedRelease(this.getCountRemovedPlain() + 1L); ++ } ++ ++ return ret; ++ } ++ ++ public long size() { ++ final long removed = this.getCountRemovedAcquire(); ++ final long added = this.getCountAddedAcquire(); ++ ++ return added - removed; ++ } ++ } ++ ++ private static class CustomLongArray extends LongArrayList { ++ ++ public CustomLongArray() { ++ super(); ++ } ++ ++ public CustomLongArray(final int expected) { ++ super(expected); ++ } ++ ++ public boolean addAll(final CustomLongArray list) { ++ this.addElements(this.size, list.a, 0, list.size); ++ return list.size != 0; ++ } ++ ++ public void addUnchecked(final long value) { ++ this.a[this.size++] = value; ++ } ++ ++ public void forceSize(final int to) { ++ this.size = to; ++ } ++ ++ @Override ++ public int hashCode() { ++ long h = 1L; ++ ++ Objects.checkFromToIndex(0, this.size, this.a.length); ++ ++ for (int i = 0; i < this.size; ++i) { ++ h = it.unimi.dsi.fastutil.HashCommon.mix(h + this.a[i]); ++ } ++ ++ return (int)h; ++ } ++ ++ @Override ++ public boolean equals(final Object o) { ++ if (o == this) { ++ return true; ++ } ++ ++ if (!(o instanceof CustomLongArray other)) { ++ return false; ++ } ++ ++ return this.size == other.size && Arrays.equals(this.a, 0, this.size, other.a, 0, this.size); ++ } ++ } ++ ++ private static int getDistanceSize(final int radius, final int max) { ++ if (radius == 0) { ++ return 1; ++ } ++ final int diff = radius - max; ++ if (diff <= 0) { ++ return 4*radius; ++ } ++ return 4*(max - Math.max(0, diff - 1)); ++ } ++ ++ private static int getQ1DistanceSize(final int radius, final int max) { ++ if (radius == 0) { ++ return 1; ++ } ++ final int diff = radius - max; ++ if (diff <= 0) { ++ return radius+1; ++ } ++ return max - diff + 1; ++ } ++ ++ private static final class BasicFIFOLQueue { ++ ++ private final long[] values; ++ private int head, tail; ++ ++ public BasicFIFOLQueue(final int cap) { ++ if (cap <= 1) { ++ throw new IllegalArgumentException(); ++ } ++ this.values = new long[cap]; ++ } ++ ++ public boolean isEmpty() { ++ return this.head == this.tail; ++ } ++ ++ public long removeFirst() { ++ final long ret = this.values[this.head]; ++ ++ if (this.head == this.tail) { ++ throw new IllegalStateException(); ++ } ++ ++ ++this.head; ++ if (this.head == this.values.length) { ++ this.head = 0; ++ } ++ ++ return ret; ++ } ++ ++ public void addLast(final long value) { ++ this.values[this.tail++] = value; ++ ++ if (this.tail == this.head) { ++ throw new IllegalStateException(); ++ } ++ ++ if (this.tail == this.values.length) { ++ this.tail = 0; ++ } ++ } ++ } ++ ++ private static CustomLongArray[] makeQ1BFS(final int radius) { ++ final CustomLongArray[] ret = new CustomLongArray[2 * radius + 1]; ++ final BasicFIFOLQueue queue = new BasicFIFOLQueue(Math.max(1, 4 * radius) + 1); ++ final LongOpenHashSet seen = new LongOpenHashSet((radius + 1) * (radius + 1)); ++ ++ seen.add(CoordinateUtils.getChunkKey(0, 0)); ++ queue.addLast(CoordinateUtils.getChunkKey(0, 0)); ++ while (!queue.isEmpty()) { ++ final long chunk = queue.removeFirst(); ++ final int chunkX = CoordinateUtils.getChunkX(chunk); ++ final int chunkZ = CoordinateUtils.getChunkZ(chunk); ++ ++ final int index = Math.abs(chunkX) + Math.abs(chunkZ); ++ final CustomLongArray list = ret[index]; ++ if (list != null) { ++ list.addUnchecked(chunk); ++ } else { ++ (ret[index] = new CustomLongArray(getQ1DistanceSize(index, radius))).addUnchecked(chunk); ++ } ++ ++ for (int i = 0; i < 4; ++i) { ++ // 0 -> -1, 0 ++ // 1 -> 0, -1 ++ // 2 -> 1, 0 ++ // 3 -> 0, 1 ++ ++ final int signInv = -(i >>> 1); // 2/3 -> -(1), 0/1 -> -(0) ++ // note: -n = (~n) + 1 ++ // (n ^ signInv) - signInv = signInv == 0 ? ((n ^ 0) - 0 = n) : ((n ^ -1) - (-1) = ~n + 1) ++ ++ final int axis = i & 1; // 0/2 -> 0, 1/3 -> 1 ++ final int dx = ((axis - 1) ^ signInv) - signInv; // 0 -> -1, 1 -> 0 ++ final int dz = (-axis ^ signInv) - signInv; // 0 -> 0, 1 -> -1 ++ ++ final int neighbourX = chunkX + dx; ++ final int neighbourZ = chunkZ + dz; ++ final long neighbour = CoordinateUtils.getChunkKey(neighbourX, neighbourZ); ++ ++ if ((neighbourX | neighbourZ) < 0 || Math.max(Math.abs(neighbourX), Math.abs(neighbourZ)) > radius) { ++ // don't enqueue out of range ++ continue; ++ } ++ ++ if (!seen.add(neighbour)) { ++ continue; ++ } ++ ++ queue.addLast(neighbour); ++ } ++ } ++ ++ return ret; ++ } ++ ++ // doesn't appear worth optimising this function now, even though it's 70% of the call ++ private static CustomLongArray spread(final CustomLongArray input, final int size) { ++ final LongLinkedOpenHashSet notAdded = new LongLinkedOpenHashSet(input); ++ final CustomLongArray added = new CustomLongArray(size); ++ ++ while (!notAdded.isEmpty()) { ++ if (added.isEmpty()) { ++ added.addUnchecked(notAdded.removeLastLong()); ++ continue; ++ } ++ ++ long maxChunk = -1L; ++ int maxDist = 0; ++ ++ // select the chunk from the not yet added set that has the largest minimum distance from ++ // the current set of added chunks ++ ++ for (final LongIterator iterator = notAdded.iterator(); iterator.hasNext();) { ++ final long chunkKey = iterator.nextLong(); ++ final int chunkX = CoordinateUtils.getChunkX(chunkKey); ++ final int chunkZ = CoordinateUtils.getChunkZ(chunkKey); ++ ++ int minDist = Integer.MAX_VALUE; ++ ++ final int len = added.size(); ++ final long[] addedArr = added.elements(); ++ Objects.checkFromToIndex(0, len, addedArr.length); ++ for (int i = 0; i < len; ++i) { ++ final long addedKey = addedArr[i]; ++ final int addedX = CoordinateUtils.getChunkX(addedKey); ++ final int addedZ = CoordinateUtils.getChunkZ(addedKey); ++ ++ // here we use square distance because chunk generation uses neighbours in a square radius ++ final int dist = Math.max(Math.abs(addedX - chunkX), Math.abs(addedZ - chunkZ)); ++ ++ minDist = Math.min(dist, minDist); ++ } ++ ++ if (minDist > maxDist) { ++ maxDist = minDist; ++ maxChunk = chunkKey; ++ } ++ } ++ ++ // move the selected chunk from the not added set to the added set ++ ++ if (!notAdded.remove(maxChunk)) { ++ throw new IllegalStateException(); ++ } ++ ++ added.addUnchecked(maxChunk); ++ } ++ ++ return added; ++ } ++} +diff --git a/src/main/java/io/papermc/paper/chunk/system/entity/EntityLookup.java b/src/main/java/io/papermc/paper/chunk/system/entity/EntityLookup.java +new file mode 100644 +index 0000000000000000000000000000000000000000..15ee41452992714108efe53b708b5a4e1da7c1ff +--- /dev/null ++++ b/src/main/java/io/papermc/paper/chunk/system/entity/EntityLookup.java +@@ -0,0 +1,902 @@ ++package io.papermc.paper.chunk.system.entity; ++ ++import com.destroystokyo.paper.util.maplist.EntityList; ++import com.mojang.logging.LogUtils; ++import io.papermc.paper.util.CoordinateUtils; ++import io.papermc.paper.util.TickThread; ++import io.papermc.paper.util.WorldUtil; ++import io.papermc.paper.world.ChunkEntitySlices; ++import it.unimi.dsi.fastutil.ints.Int2ReferenceOpenHashMap; ++import it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap; ++import it.unimi.dsi.fastutil.objects.Object2ReferenceOpenHashMap; ++import net.minecraft.core.BlockPos; ++import io.papermc.paper.chunk.system.ChunkSystem; ++import net.minecraft.server.level.ChunkHolder; ++import net.minecraft.server.level.ServerLevel; ++import net.minecraft.util.AbortableIterationConsumer; ++import net.minecraft.util.Mth; ++import net.minecraft.world.entity.Entity; ++import net.minecraft.world.entity.EntityType; ++import net.minecraft.world.level.ChunkPos; ++import net.minecraft.world.level.entity.EntityInLevelCallback; ++import net.minecraft.world.level.entity.EntityTypeTest; ++import net.minecraft.world.level.entity.LevelCallback; ++import net.minecraft.server.level.FullChunkStatus; ++import net.minecraft.world.level.entity.LevelEntityGetter; ++import net.minecraft.world.level.entity.Visibility; ++import net.minecraft.world.phys.AABB; ++import net.minecraft.world.phys.Vec3; ++import org.jetbrains.annotations.NotNull; ++import org.jetbrains.annotations.Nullable; ++import org.slf4j.Logger; ++import java.util.ArrayList; ++import java.util.Arrays; ++import java.util.Iterator; ++import java.util.List; ++import java.util.NoSuchElementException; ++import java.util.UUID; ++import java.util.concurrent.locks.StampedLock; ++import java.util.function.Consumer; ++import java.util.function.Predicate; ++ ++public final class EntityLookup implements LevelEntityGetter<Entity> { ++ ++ private static final Logger LOGGER = LogUtils.getClassLogger(); ++ ++ protected static final int REGION_SHIFT = 5; ++ protected static final int REGION_MASK = (1 << REGION_SHIFT) - 1; ++ protected static final int REGION_SIZE = 1 << REGION_SHIFT; ++ ++ public final ServerLevel world; ++ ++ private final StampedLock stateLock = new StampedLock(); ++ protected final Long2ObjectOpenHashMap<ChunkSlicesRegion> regions = new Long2ObjectOpenHashMap<>(128, 0.5f); ++ ++ private final int minSection; // inclusive ++ private final int maxSection; // inclusive ++ private final LevelCallback<Entity> worldCallback; ++ ++ private final StampedLock entityByLock = new StampedLock(); ++ private final Int2ReferenceOpenHashMap<Entity> entityById = new Int2ReferenceOpenHashMap<>(); ++ private final Object2ReferenceOpenHashMap<UUID, Entity> entityByUUID = new Object2ReferenceOpenHashMap<>(); ++ private final EntityList accessibleEntities = new EntityList(); ++ ++ public EntityLookup(final ServerLevel world, final LevelCallback<Entity> worldCallback) { ++ this.world = world; ++ this.minSection = WorldUtil.getMinSection(world); ++ this.maxSection = WorldUtil.getMaxSection(world); ++ this.worldCallback = worldCallback; ++ } ++ ++ private static Entity maskNonAccessible(final Entity entity) { ++ if (entity == null) { ++ return null; ++ } ++ final Visibility visibility = EntityLookup.getEntityStatus(entity); ++ return visibility.isAccessible() ? entity : null; ++ } ++ ++ @Nullable ++ @Override ++ public Entity get(final int id) { ++ final long attempt = this.entityByLock.tryOptimisticRead(); ++ if (attempt != 0L) { ++ try { ++ final Entity ret = this.entityById.get(id); ++ ++ if (this.entityByLock.validate(attempt)) { ++ return maskNonAccessible(ret); ++ } ++ } catch (final Error error) { ++ throw error; ++ } catch (final Throwable thr) { ++ // ignore ++ } ++ } ++ ++ this.entityByLock.readLock(); ++ try { ++ return maskNonAccessible(this.entityById.get(id)); ++ } finally { ++ this.entityByLock.tryUnlockRead(); ++ } ++ } ++ ++ @Nullable ++ @Override ++ public Entity get(final UUID id) { ++ final long attempt = this.entityByLock.tryOptimisticRead(); ++ if (attempt != 0L) { ++ try { ++ final Entity ret = this.entityByUUID.get(id); ++ ++ if (this.entityByLock.validate(attempt)) { ++ return maskNonAccessible(ret); ++ } ++ } catch (final Error error) { ++ throw error; ++ } catch (final Throwable thr) { ++ // ignore ++ } ++ } ++ ++ this.entityByLock.readLock(); ++ try { ++ return maskNonAccessible(this.entityByUUID.get(id)); ++ } finally { ++ this.entityByLock.tryUnlockRead(); ++ } ++ } ++ ++ public boolean hasEntity(final UUID uuid) { ++ return this.get(uuid) != null; ++ } ++ ++ public String getDebugInfo() { ++ return "count_id:" + this.entityById.size() + ",count_uuid:" + this.entityByUUID.size() + ",region_count:" + this.regions.size(); ++ } ++ ++ static final class ArrayIterable<T> implements Iterable<T> { ++ ++ private final T[] array; ++ private final int off; ++ private final int length; ++ ++ public ArrayIterable(final T[] array, final int off, final int length) { ++ this.array = array; ++ this.off = off; ++ this.length = length; ++ if (length > array.length) { ++ throw new IllegalArgumentException("Length must be no greater-than the array length"); ++ } ++ } ++ ++ @NotNull ++ @Override ++ public Iterator<T> iterator() { ++ return new ArrayIterator<>(this.array, this.off, this.length); ++ } ++ ++ static final class ArrayIterator<T> implements Iterator<T> { ++ ++ private final T[] array; ++ private int off; ++ private final int length; ++ ++ public ArrayIterator(final T[] array, final int off, final int length) { ++ this.array = array; ++ this.off = off; ++ this.length = length; ++ } ++ ++ @Override ++ public boolean hasNext() { ++ return this.off < this.length; ++ } ++ ++ @Override ++ public T next() { ++ if (this.off >= this.length) { ++ throw new NoSuchElementException(); ++ } ++ return this.array[this.off++]; ++ } ++ ++ @Override ++ public void remove() { ++ throw new UnsupportedOperationException(); ++ } ++ } ++ } ++ ++ @Override ++ public Iterable<Entity> getAll() { ++ return new ArrayIterable<>(this.accessibleEntities.getRawData(), 0, this.accessibleEntities.size()); ++ } ++ ++ public Entity[] getAllCopy() { ++ return Arrays.copyOf(this.accessibleEntities.getRawData(), this.accessibleEntities.size(), Entity[].class); ++ } ++ ++ @Override ++ public <U extends Entity> void get(final EntityTypeTest<Entity, U> filter, final AbortableIterationConsumer<U> action) { ++ final Int2ReferenceOpenHashMap<Entity> entityCopy; ++ ++ this.entityByLock.readLock(); ++ try { ++ entityCopy = this.entityById.clone(); ++ } finally { ++ this.entityByLock.tryUnlockRead(); ++ } ++ for (final Entity entity : entityCopy.values()) { ++ final Visibility visibility = EntityLookup.getEntityStatus(entity); ++ if (!visibility.isAccessible()) { ++ continue; ++ } ++ final U casted = filter.tryCast(entity); ++ if (casted != null && action.accept(casted).shouldAbort()) { ++ break; ++ } ++ } ++ } ++ ++ @Override ++ public void get(final AABB box, final Consumer<Entity> action) { ++ List<Entity> entities = new ArrayList<>(); ++ this.getEntitiesWithoutDragonParts(null, box, entities, null); ++ for (int i = 0, len = entities.size(); i < len; ++i) { ++ action.accept(entities.get(i)); ++ } ++ } ++ ++ @Override ++ public <U extends Entity> void get(final EntityTypeTest<Entity, U> filter, final AABB box, final AbortableIterationConsumer<U> action) { ++ List<Entity> entities = new ArrayList<>(); ++ this.getEntitiesWithoutDragonParts(null, box, entities, null); ++ for (int i = 0, len = entities.size(); i < len; ++i) { ++ final U casted = filter.tryCast(entities.get(i)); ++ if (casted != null && action.accept(casted).shouldAbort()) { ++ break; ++ } ++ } ++ } ++ ++ public void entityStatusChange(final Entity entity, final ChunkEntitySlices slices, final Visibility oldVisibility, final Visibility newVisibility, final boolean moved, ++ final boolean created, final boolean destroyed) { ++ TickThread.ensureTickThread(entity, "Entity status change must only happen on the main thread"); ++ ++ if (entity.updatingSectionStatus) { ++ // recursive status update ++ LOGGER.error("Cannot recursively update entity chunk status for entity " + entity, new Throwable()); ++ return; ++ } ++ ++ final boolean entityStatusUpdateBefore = slices == null ? false : slices.startPreventingStatusUpdates(); ++ ++ if (entityStatusUpdateBefore) { ++ LOGGER.error("Cannot update chunk status for entity " + entity + " since entity chunk (" + slices.chunkX + "," + slices.chunkZ + ") is receiving update", new Throwable()); ++ return; ++ } ++ ++ try { ++ final Boolean ticketBlockBefore = this.world.chunkTaskScheduler.chunkHolderManager.blockTicketUpdates(); ++ try { ++ entity.updatingSectionStatus = true; ++ try { ++ if (created) { ++ EntityLookup.this.worldCallback.onCreated(entity); ++ } ++ ++ if (oldVisibility == newVisibility) { ++ if (moved && newVisibility.isAccessible()) { ++ EntityLookup.this.worldCallback.onSectionChange(entity); ++ } ++ return; ++ } ++ ++ if (newVisibility.ordinal() > oldVisibility.ordinal()) { ++ // status upgrade ++ if (!oldVisibility.isAccessible() && newVisibility.isAccessible()) { ++ this.accessibleEntities.add(entity); ++ EntityLookup.this.worldCallback.onTrackingStart(entity); ++ } ++ ++ if (!oldVisibility.isTicking() && newVisibility.isTicking()) { ++ EntityLookup.this.worldCallback.onTickingStart(entity); ++ } ++ } else { ++ // status downgrade ++ if (oldVisibility.isTicking() && !newVisibility.isTicking()) { ++ EntityLookup.this.worldCallback.onTickingEnd(entity); ++ } ++ ++ if (oldVisibility.isAccessible() && !newVisibility.isAccessible()) { ++ this.accessibleEntities.remove(entity); ++ EntityLookup.this.worldCallback.onTrackingEnd(entity); ++ } ++ } ++ ++ if (moved && newVisibility.isAccessible()) { ++ EntityLookup.this.worldCallback.onSectionChange(entity); ++ } ++ ++ if (destroyed) { ++ EntityLookup.this.worldCallback.onDestroyed(entity); ++ } ++ } finally { ++ entity.updatingSectionStatus = false; ++ } ++ } finally { ++ this.world.chunkTaskScheduler.chunkHolderManager.unblockTicketUpdates(ticketBlockBefore); ++ } ++ } finally { ++ if (slices != null) { ++ slices.stopPreventingStatusUpdates(false); ++ } ++ } ++ } ++ ++ public void chunkStatusChange(final int x, final int z, final FullChunkStatus newStatus) { ++ this.getChunk(x, z).updateStatus(newStatus, this); ++ } ++ ++ public void addLegacyChunkEntities(final List<Entity> entities, final ChunkPos forChunk) { ++ this.addEntityChunk(entities, forChunk, true); ++ } ++ ++ public void addEntityChunkEntities(final List<Entity> entities, final ChunkPos forChunk) { ++ this.addEntityChunk(entities, forChunk, true); ++ } ++ ++ public void addWorldGenChunkEntities(final List<Entity> entities, final ChunkPos forChunk) { ++ this.addEntityChunk(entities, forChunk, false); ++ } ++ ++ private void addRecursivelySafe(final Entity root, final boolean fromDisk) { ++ if (!this.addEntity(root, fromDisk)) { ++ // possible we are a passenger, and so should dismount from any valid entity in the world ++ root.stopRiding(true); ++ return; ++ } ++ for (final Entity passenger : root.getPassengers()) { ++ this.addRecursivelySafe(passenger, fromDisk); ++ } ++ } ++ ++ private void addEntityChunk(final List<Entity> entities, final ChunkPos forChunk, final boolean fromDisk) { ++ for (int i = 0, len = entities.size(); i < len; ++i) { ++ final Entity entity = entities.get(i); ++ if (entity.isPassenger()) { ++ continue; ++ } ++ ++ if (!entity.chunkPosition().equals(forChunk)) { ++ LOGGER.warn("Root entity " + entity + " is outside of serialized chunk " + forChunk); ++ // can't set removed here, as we may not own the chunk position ++ // skip the entity ++ continue; ++ } ++ ++ final Vec3 rootPosition = entity.position(); ++ ++ // always adjust positions before adding passengers in case plugins access the entity, and so that ++ // they are added to the right entity chunk ++ for (final Entity passenger : entity.getIndirectPassengers()) { ++ if (!passenger.chunkPosition().equals(forChunk)) { ++ passenger.setPosRaw(rootPosition.x, rootPosition.y, rootPosition.z, true); ++ } ++ } ++ ++ this.addRecursivelySafe(entity, fromDisk); ++ } ++ } ++ ++ public boolean addNewEntity(final Entity entity) { ++ return this.addEntity(entity, false); ++ } ++ ++ public static Visibility getEntityStatus(final Entity entity) { ++ if (entity.isAlwaysTicking()) { ++ return Visibility.TICKING; ++ } ++ final FullChunkStatus entityStatus = entity.chunkStatus; ++ return Visibility.fromFullChunkStatus(entityStatus == null ? FullChunkStatus.INACCESSIBLE : entityStatus); ++ } ++ ++ private boolean addEntity(final Entity entity, final boolean fromDisk) { ++ final BlockPos pos = entity.blockPosition(); ++ final int sectionX = pos.getX() >> 4; ++ final int sectionY = Mth.clamp(pos.getY() >> 4, this.minSection, this.maxSection); ++ final int sectionZ = pos.getZ() >> 4; ++ TickThread.ensureTickThread(this.world, sectionX, sectionZ, "Cannot add entity off-main thread"); ++ ++ if (entity.isRemoved()) { ++ LOGGER.warn("Refusing to add removed entity: " + entity); ++ return false; ++ } ++ ++ if (entity.updatingSectionStatus) { ++ LOGGER.warn("Entity " + entity + " is currently prevented from being added/removed to world since it is processing section status updates", new Throwable()); ++ return false; ++ } ++ ++ if (fromDisk) { ++ ChunkSystem.onEntityPreAdd(this.world, entity); ++ if (entity.isRemoved()) { ++ // removed from checkDupeUUID call ++ return false; ++ } ++ } ++ ++ this.entityByLock.writeLock(); ++ try { ++ if (this.entityById.containsKey(entity.getId())) { ++ LOGGER.warn("Entity id already exists: " + entity.getId() + ", mapped to " + this.entityById.get(entity.getId()) + ", can't add " + entity); ++ return false; ++ } ++ if (this.entityByUUID.containsKey(entity.getUUID())) { ++ LOGGER.warn("Entity uuid already exists: " + entity.getUUID() + ", mapped to " + this.entityByUUID.get(entity.getUUID()) + ", can't add " + entity); ++ return false; ++ } ++ this.entityById.put(entity.getId(), entity); ++ this.entityByUUID.put(entity.getUUID(), entity); ++ } finally { ++ this.entityByLock.tryUnlockWrite(); ++ } ++ ++ entity.sectionX = sectionX; ++ entity.sectionY = sectionY; ++ entity.sectionZ = sectionZ; ++ final ChunkEntitySlices slices = this.getOrCreateChunk(sectionX, sectionZ); ++ if (!slices.addEntity(entity, sectionY)) { ++ LOGGER.warn("Entity " + entity + " added to world '" + this.world.getWorld().getName() + "', but was already contained in entity chunk (" + sectionX + "," + sectionZ + ")"); ++ } ++ ++ entity.setLevelCallback(new EntityCallback(entity)); ++ ++ this.entityStatusChange(entity, slices, Visibility.HIDDEN, getEntityStatus(entity), false, !fromDisk, false); ++ ++ return true; ++ } ++ ++ public boolean canRemoveEntity(final Entity entity) { ++ if (entity.updatingSectionStatus) { ++ return false; ++ } ++ ++ final int sectionX = entity.sectionX; ++ final int sectionZ = entity.sectionZ; ++ final ChunkEntitySlices slices = this.getChunk(sectionX, sectionZ); ++ return slices == null || !slices.isPreventingStatusUpdates(); ++ } ++ ++ private void removeEntity(final Entity entity) { ++ final int sectionX = entity.sectionX; ++ final int sectionY = entity.sectionY; ++ final int sectionZ = entity.sectionZ; ++ TickThread.ensureTickThread(this.world, sectionX, sectionZ, "Cannot remove entity off-main"); ++ if (!entity.isRemoved()) { ++ throw new IllegalStateException("Only call Entity#setRemoved to remove an entity"); ++ } ++ final ChunkEntitySlices slices = this.getChunk(sectionX, sectionZ); ++ // all entities should be in a chunk ++ if (slices == null) { ++ LOGGER.warn("Cannot remove entity " + entity + " from null entity slices (" + sectionX + "," + sectionZ + ")"); ++ } else { ++ if (slices.isPreventingStatusUpdates()) { ++ throw new IllegalStateException("Attempting to remove entity " + entity + " from entity slices (" + sectionX + "," + sectionZ + ") that is receiving status updates"); ++ } ++ if (!slices.removeEntity(entity, sectionY)) { ++ LOGGER.warn("Failed to remove entity " + entity + " from entity slices (" + sectionX + "," + sectionZ + ")"); ++ } ++ } ++ entity.sectionX = entity.sectionY = entity.sectionZ = Integer.MIN_VALUE; ++ ++ this.entityByLock.writeLock(); ++ try { ++ if (!this.entityById.remove(entity.getId(), entity)) { ++ LOGGER.warn("Failed to remove entity " + entity + " by id, current entity mapped: " + this.entityById.get(entity.getId())); ++ } ++ if (!this.entityByUUID.remove(entity.getUUID(), entity)) { ++ LOGGER.warn("Failed to remove entity " + entity + " by uuid, current entity mapped: " + this.entityByUUID.get(entity.getUUID())); ++ } ++ } finally { ++ this.entityByLock.tryUnlockWrite(); ++ } ++ } ++ ++ private ChunkEntitySlices moveEntity(final Entity entity) { ++ // ensure we own the entity ++ TickThread.ensureTickThread(entity, "Cannot move entity off-main"); ++ ++ final BlockPos newPos = entity.blockPosition(); ++ final int newSectionX = newPos.getX() >> 4; ++ final int newSectionY = Mth.clamp(newPos.getY() >> 4, this.minSection, this.maxSection); ++ final int newSectionZ = newPos.getZ() >> 4; ++ ++ if (newSectionX == entity.sectionX && newSectionY == entity.sectionY && newSectionZ == entity.sectionZ) { ++ return null; ++ } ++ ++ // ensure the new section is owned by this tick thread ++ TickThread.ensureTickThread(this.world, newSectionX, newSectionZ, "Cannot move entity off-main"); ++ ++ // ensure the old section is owned by this tick thread ++ TickThread.ensureTickThread(this.world, entity.sectionX, entity.sectionZ, "Cannot move entity off-main"); ++ ++ final ChunkEntitySlices old = this.getChunk(entity.sectionX, entity.sectionZ); ++ final ChunkEntitySlices slices = this.getOrCreateChunk(newSectionX, newSectionZ); ++ ++ if (!old.removeEntity(entity, entity.sectionY)) { ++ LOGGER.warn("Could not remove entity " + entity + " from its old chunk section (" + entity.sectionX + "," + entity.sectionY + "," + entity.sectionZ + ") since it was not contained in the section"); ++ } ++ ++ if (!slices.addEntity(entity, newSectionY)) { ++ LOGGER.warn("Could not add entity " + entity + " to its new chunk section (" + newSectionX + "," + newSectionY + "," + newSectionZ + ") as it is already contained in the section"); ++ } ++ ++ entity.sectionX = newSectionX; ++ entity.sectionY = newSectionY; ++ entity.sectionZ = newSectionZ; ++ ++ return slices; ++ } ++ ++ public void getEntitiesWithoutDragonParts(final Entity except, final AABB box, final List<Entity> into, final Predicate<? super Entity> predicate) { ++ final int minChunkX = (Mth.floor(box.minX) - 2) >> 4; ++ final int minChunkZ = (Mth.floor(box.minZ) - 2) >> 4; ++ final int maxChunkX = (Mth.floor(box.maxX) + 2) >> 4; ++ final int maxChunkZ = (Mth.floor(box.maxZ) + 2) >> 4; ++ ++ final int minRegionX = minChunkX >> REGION_SHIFT; ++ final int minRegionZ = minChunkZ >> REGION_SHIFT; ++ final int maxRegionX = maxChunkX >> REGION_SHIFT; ++ final int maxRegionZ = maxChunkZ >> REGION_SHIFT; ++ ++ for (int currRegionZ = minRegionZ; currRegionZ <= maxRegionZ; ++currRegionZ) { ++ final int minZ = currRegionZ == minRegionZ ? minChunkZ & REGION_MASK : 0; ++ final int maxZ = currRegionZ == maxRegionZ ? maxChunkZ & REGION_MASK : REGION_MASK; ++ ++ for (int currRegionX = minRegionX; currRegionX <= maxRegionX; ++currRegionX) { ++ final ChunkSlicesRegion region = this.getRegion(currRegionX, currRegionZ); ++ ++ if (region == null) { ++ continue; ++ } ++ ++ final int minX = currRegionX == minRegionX ? minChunkX & REGION_MASK : 0; ++ final int maxX = currRegionX == maxRegionX ? maxChunkX & REGION_MASK : REGION_MASK; ++ ++ for (int currZ = minZ; currZ <= maxZ; ++currZ) { ++ for (int currX = minX; currX <= maxX; ++currX) { ++ final ChunkEntitySlices chunk = region.get(currX | (currZ << REGION_SHIFT)); ++ if (chunk == null || !chunk.status.isOrAfter(FullChunkStatus.FULL)) { ++ continue; ++ } ++ ++ chunk.getEntitiesWithoutDragonParts(except, box, into, predicate); ++ } ++ } ++ } ++ } ++ } ++ ++ public void getEntities(final Entity except, final AABB box, final List<Entity> into, final Predicate<? super Entity> predicate) { ++ final int minChunkX = (Mth.floor(box.minX) - 2) >> 4; ++ final int minChunkZ = (Mth.floor(box.minZ) - 2) >> 4; ++ final int maxChunkX = (Mth.floor(box.maxX) + 2) >> 4; ++ final int maxChunkZ = (Mth.floor(box.maxZ) + 2) >> 4; ++ ++ final int minRegionX = minChunkX >> REGION_SHIFT; ++ final int minRegionZ = minChunkZ >> REGION_SHIFT; ++ final int maxRegionX = maxChunkX >> REGION_SHIFT; ++ final int maxRegionZ = maxChunkZ >> REGION_SHIFT; ++ ++ for (int currRegionZ = minRegionZ; currRegionZ <= maxRegionZ; ++currRegionZ) { ++ final int minZ = currRegionZ == minRegionZ ? minChunkZ & REGION_MASK : 0; ++ final int maxZ = currRegionZ == maxRegionZ ? maxChunkZ & REGION_MASK : REGION_MASK; ++ ++ for (int currRegionX = minRegionX; currRegionX <= maxRegionX; ++currRegionX) { ++ final ChunkSlicesRegion region = this.getRegion(currRegionX, currRegionZ); ++ ++ if (region == null) { ++ continue; ++ } ++ ++ final int minX = currRegionX == minRegionX ? minChunkX & REGION_MASK : 0; ++ final int maxX = currRegionX == maxRegionX ? maxChunkX & REGION_MASK : REGION_MASK; ++ ++ for (int currZ = minZ; currZ <= maxZ; ++currZ) { ++ for (int currX = minX; currX <= maxX; ++currX) { ++ final ChunkEntitySlices chunk = region.get(currX | (currZ << REGION_SHIFT)); ++ if (chunk == null || !chunk.status.isOrAfter(FullChunkStatus.FULL)) { ++ continue; ++ } ++ ++ chunk.getEntities(except, box, into, predicate); ++ } ++ } ++ } ++ } ++ } ++ ++ public void getHardCollidingEntities(final Entity except, final AABB box, final List<Entity> into, final Predicate<? super Entity> predicate) { ++ final int minChunkX = (Mth.floor(box.minX) - 2) >> 4; ++ final int minChunkZ = (Mth.floor(box.minZ) - 2) >> 4; ++ final int maxChunkX = (Mth.floor(box.maxX) + 2) >> 4; ++ final int maxChunkZ = (Mth.floor(box.maxZ) + 2) >> 4; ++ ++ final int minRegionX = minChunkX >> REGION_SHIFT; ++ final int minRegionZ = minChunkZ >> REGION_SHIFT; ++ final int maxRegionX = maxChunkX >> REGION_SHIFT; ++ final int maxRegionZ = maxChunkZ >> REGION_SHIFT; ++ ++ for (int currRegionZ = minRegionZ; currRegionZ <= maxRegionZ; ++currRegionZ) { ++ final int minZ = currRegionZ == minRegionZ ? minChunkZ & REGION_MASK : 0; ++ final int maxZ = currRegionZ == maxRegionZ ? maxChunkZ & REGION_MASK : REGION_MASK; ++ ++ for (int currRegionX = minRegionX; currRegionX <= maxRegionX; ++currRegionX) { ++ final ChunkSlicesRegion region = this.getRegion(currRegionX, currRegionZ); ++ ++ if (region == null) { ++ continue; ++ } ++ ++ final int minX = currRegionX == minRegionX ? minChunkX & REGION_MASK : 0; ++ final int maxX = currRegionX == maxRegionX ? maxChunkX & REGION_MASK : REGION_MASK; ++ ++ for (int currZ = minZ; currZ <= maxZ; ++currZ) { ++ for (int currX = minX; currX <= maxX; ++currX) { ++ final ChunkEntitySlices chunk = region.get(currX | (currZ << REGION_SHIFT)); ++ if (chunk == null || !chunk.status.isOrAfter(FullChunkStatus.FULL)) { ++ continue; ++ } ++ ++ chunk.getHardCollidingEntities(except, box, into, predicate); ++ } ++ } ++ } ++ } ++ } ++ ++ public <T extends Entity> void getEntities(final EntityType<?> type, final AABB box, final List<? super T> into, ++ final Predicate<? super T> predicate) { ++ final int minChunkX = (Mth.floor(box.minX) - 2) >> 4; ++ final int minChunkZ = (Mth.floor(box.minZ) - 2) >> 4; ++ final int maxChunkX = (Mth.floor(box.maxX) + 2) >> 4; ++ final int maxChunkZ = (Mth.floor(box.maxZ) + 2) >> 4; ++ ++ final int minRegionX = minChunkX >> REGION_SHIFT; ++ final int minRegionZ = minChunkZ >> REGION_SHIFT; ++ final int maxRegionX = maxChunkX >> REGION_SHIFT; ++ final int maxRegionZ = maxChunkZ >> REGION_SHIFT; ++ ++ for (int currRegionZ = minRegionZ; currRegionZ <= maxRegionZ; ++currRegionZ) { ++ final int minZ = currRegionZ == minRegionZ ? minChunkZ & REGION_MASK : 0; ++ final int maxZ = currRegionZ == maxRegionZ ? maxChunkZ & REGION_MASK : REGION_MASK; ++ ++ for (int currRegionX = minRegionX; currRegionX <= maxRegionX; ++currRegionX) { ++ final ChunkSlicesRegion region = this.getRegion(currRegionX, currRegionZ); ++ ++ if (region == null) { ++ continue; ++ } ++ ++ final int minX = currRegionX == minRegionX ? minChunkX & REGION_MASK : 0; ++ final int maxX = currRegionX == maxRegionX ? maxChunkX & REGION_MASK : REGION_MASK; ++ ++ for (int currZ = minZ; currZ <= maxZ; ++currZ) { ++ for (int currX = minX; currX <= maxX; ++currX) { ++ final ChunkEntitySlices chunk = region.get(currX | (currZ << REGION_SHIFT)); ++ if (chunk == null || !chunk.status.isOrAfter(FullChunkStatus.FULL)) { ++ continue; ++ } ++ ++ chunk.getEntities(type, box, (List)into, (Predicate)predicate); ++ } ++ } ++ } ++ } ++ } ++ ++ public <T extends Entity> void getEntities(final Class<? extends T> clazz, final Entity except, final AABB box, final List<? super T> into, ++ final Predicate<? super T> predicate) { ++ final int minChunkX = (Mth.floor(box.minX) - 2) >> 4; ++ final int minChunkZ = (Mth.floor(box.minZ) - 2) >> 4; ++ final int maxChunkX = (Mth.floor(box.maxX) + 2) >> 4; ++ final int maxChunkZ = (Mth.floor(box.maxZ) + 2) >> 4; ++ ++ final int minRegionX = minChunkX >> REGION_SHIFT; ++ final int minRegionZ = minChunkZ >> REGION_SHIFT; ++ final int maxRegionX = maxChunkX >> REGION_SHIFT; ++ final int maxRegionZ = maxChunkZ >> REGION_SHIFT; ++ ++ for (int currRegionZ = minRegionZ; currRegionZ <= maxRegionZ; ++currRegionZ) { ++ final int minZ = currRegionZ == minRegionZ ? minChunkZ & REGION_MASK : 0; ++ final int maxZ = currRegionZ == maxRegionZ ? maxChunkZ & REGION_MASK : REGION_MASK; ++ ++ for (int currRegionX = minRegionX; currRegionX <= maxRegionX; ++currRegionX) { ++ final ChunkSlicesRegion region = this.getRegion(currRegionX, currRegionZ); ++ ++ if (region == null) { ++ continue; ++ } ++ ++ final int minX = currRegionX == minRegionX ? minChunkX & REGION_MASK : 0; ++ final int maxX = currRegionX == maxRegionX ? maxChunkX & REGION_MASK : REGION_MASK; ++ ++ for (int currZ = minZ; currZ <= maxZ; ++currZ) { ++ for (int currX = minX; currX <= maxX; ++currX) { ++ final ChunkEntitySlices chunk = region.get(currX | (currZ << REGION_SHIFT)); ++ if (chunk == null || !chunk.status.isOrAfter(FullChunkStatus.FULL)) { ++ continue; ++ } ++ ++ chunk.getEntities(clazz, except, box, into, predicate); ++ } ++ } ++ } ++ } ++ } ++ ++ public void entitySectionLoad(final int chunkX, final int chunkZ, final ChunkEntitySlices slices) { ++ TickThread.ensureTickThread(this.world, chunkX, chunkZ, "Cannot load in entity section off-main"); ++ synchronized (this) { ++ final ChunkEntitySlices curr = this.getChunk(chunkX, chunkZ); ++ if (curr != null) { ++ this.removeChunk(chunkX, chunkZ); ++ ++ curr.mergeInto(slices); ++ ++ this.addChunk(chunkX, chunkZ, slices); ++ } else { ++ this.addChunk(chunkX, chunkZ, slices); ++ } ++ } ++ } ++ ++ public void entitySectionUnload(final int chunkX, final int chunkZ) { ++ TickThread.ensureTickThread(this.world, chunkX, chunkZ, "Cannot unload entity section off-main"); ++ this.removeChunk(chunkX, chunkZ); ++ } ++ ++ public ChunkEntitySlices getChunk(final int chunkX, final int chunkZ) { ++ final ChunkSlicesRegion region = this.getRegion(chunkX >> REGION_SHIFT, chunkZ >> REGION_SHIFT); ++ if (region == null) { ++ return null; ++ } ++ ++ return region.get((chunkX & REGION_MASK) | ((chunkZ & REGION_MASK) << REGION_SHIFT)); ++ } ++ ++ public ChunkEntitySlices getOrCreateChunk(final int chunkX, final int chunkZ) { ++ final ChunkSlicesRegion region = this.getRegion(chunkX >> REGION_SHIFT, chunkZ >> REGION_SHIFT); ++ ChunkEntitySlices ret; ++ if (region == null || (ret = region.get((chunkX & REGION_MASK) | ((chunkZ & REGION_MASK) << REGION_SHIFT))) == null) { ++ // loadInEntityChunk will call addChunk for us ++ return this.world.chunkTaskScheduler.chunkHolderManager.getOrCreateEntityChunk(chunkX, chunkZ, true); ++ } ++ ++ return ret; ++ } ++ ++ public ChunkSlicesRegion getRegion(final int regionX, final int regionZ) { ++ final long key = CoordinateUtils.getChunkKey(regionX, regionZ); ++ final long attempt = this.stateLock.tryOptimisticRead(); ++ if (attempt != 0L) { ++ try { ++ final ChunkSlicesRegion ret = this.regions.get(key); ++ ++ if (this.stateLock.validate(attempt)) { ++ return ret; ++ } ++ } catch (final Error error) { ++ throw error; ++ } catch (final Throwable thr) { ++ // ignore ++ } ++ } ++ ++ this.stateLock.readLock(); ++ try { ++ return this.regions.get(key); ++ } finally { ++ this.stateLock.tryUnlockRead(); ++ } ++ } ++ ++ private synchronized void removeChunk(final int chunkX, final int chunkZ) { ++ final long key = CoordinateUtils.getChunkKey(chunkX >> REGION_SHIFT, chunkZ >> REGION_SHIFT); ++ final int relIndex = (chunkX & REGION_MASK) | ((chunkZ & REGION_MASK) << REGION_SHIFT); ++ ++ final ChunkSlicesRegion region = this.regions.get(key); ++ final int remaining = region.remove(relIndex); ++ ++ if (remaining == 0) { ++ this.stateLock.writeLock(); ++ try { ++ this.regions.remove(key); ++ } finally { ++ this.stateLock.tryUnlockWrite(); ++ } ++ } ++ } ++ ++ public synchronized void addChunk(final int chunkX, final int chunkZ, final ChunkEntitySlices slices) { ++ final long key = CoordinateUtils.getChunkKey(chunkX >> REGION_SHIFT, chunkZ >> REGION_SHIFT); ++ final int relIndex = (chunkX & REGION_MASK) | ((chunkZ & REGION_MASK) << REGION_SHIFT); ++ ++ ChunkSlicesRegion region = this.regions.get(key); ++ if (region != null) { ++ region.add(relIndex, slices); ++ } else { ++ region = new ChunkSlicesRegion(); ++ region.add(relIndex, slices); ++ this.stateLock.writeLock(); ++ try { ++ this.regions.put(key, region); ++ } finally { ++ this.stateLock.tryUnlockWrite(); ++ } ++ } ++ } ++ ++ public static final class ChunkSlicesRegion { ++ ++ protected final ChunkEntitySlices[] slices = new ChunkEntitySlices[REGION_SIZE * REGION_SIZE]; ++ protected int sliceCount; ++ ++ public ChunkEntitySlices get(final int index) { ++ return this.slices[index]; ++ } ++ ++ public int remove(final int index) { ++ final ChunkEntitySlices slices = this.slices[index]; ++ if (slices == null) { ++ throw new IllegalStateException(); ++ } ++ ++ this.slices[index] = null; ++ ++ return --this.sliceCount; ++ } ++ ++ public void add(final int index, final ChunkEntitySlices slices) { ++ final ChunkEntitySlices curr = this.slices[index]; ++ if (curr != null) { ++ throw new IllegalStateException(); ++ } ++ ++ this.slices[index] = slices; ++ ++ ++this.sliceCount; ++ } ++ } ++ ++ private final class EntityCallback implements EntityInLevelCallback { ++ ++ public final Entity entity; ++ ++ public EntityCallback(final Entity entity) { ++ this.entity = entity; ++ } ++ ++ @Override ++ public void onMove() { ++ final Entity entity = this.entity; ++ final Visibility oldVisibility = getEntityStatus(entity); ++ final ChunkEntitySlices newSlices = EntityLookup.this.moveEntity(this.entity); ++ if (newSlices == null) { ++ // no new section, so didn't change sections ++ return; ++ } ++ final Visibility newVisibility = getEntityStatus(entity); ++ ++ EntityLookup.this.entityStatusChange(entity, newSlices, oldVisibility, newVisibility, true, false, false); ++ } ++ ++ @Override ++ public void onRemove(final Entity.RemovalReason reason) { ++ final Entity entity = this.entity; ++ TickThread.ensureTickThread(entity, "Cannot remove entity off-main"); // Paper - rewrite chunk system ++ final Visibility tickingState = EntityLookup.getEntityStatus(entity); ++ ++ EntityLookup.this.removeEntity(entity); ++ ++ EntityLookup.this.entityStatusChange(entity, null, tickingState, Visibility.HIDDEN, false, false, reason.shouldDestroy()); ++ ++ this.entity.setLevelCallback(NoOpCallback.INSTANCE); ++ } ++ } ++ ++ private static final class NoOpCallback implements EntityInLevelCallback { ++ ++ public static final NoOpCallback INSTANCE = new NoOpCallback(); ++ ++ @Override ++ public void onMove() {} ++ ++ @Override ++ public void onRemove(final Entity.RemovalReason reason) {} ++ } ++} +diff --git a/src/main/java/io/papermc/paper/chunk/system/io/RegionFileIOThread.java b/src/main/java/io/papermc/paper/chunk/system/io/RegionFileIOThread.java +new file mode 100644 +index 0000000000000000000000000000000000000000..2934f0cf0ef09c84739312b00186c2ef0019a165 +--- /dev/null ++++ b/src/main/java/io/papermc/paper/chunk/system/io/RegionFileIOThread.java +@@ -0,0 +1,1343 @@ ++package io.papermc.paper.chunk.system.io; ++ ++import ca.spottedleaf.concurrentutil.collection.MultiThreadedQueue; ++import ca.spottedleaf.concurrentutil.executor.Cancellable; ++import ca.spottedleaf.concurrentutil.executor.standard.PrioritisedExecutor; ++import ca.spottedleaf.concurrentutil.executor.standard.PrioritisedQueueExecutorThread; ++import ca.spottedleaf.concurrentutil.executor.standard.PrioritisedThreadedTaskQueue; ++import ca.spottedleaf.concurrentutil.util.ConcurrentUtil; ++import com.mojang.logging.LogUtils; ++import io.papermc.paper.util.CoordinateUtils; ++import io.papermc.paper.util.TickThread; ++import it.unimi.dsi.fastutil.HashCommon; ++import net.minecraft.nbt.CompoundTag; ++import net.minecraft.server.level.ServerLevel; ++import net.minecraft.world.level.ChunkPos; ++import net.minecraft.world.level.chunk.storage.RegionFile; ++import net.minecraft.world.level.chunk.storage.RegionFileStorage; ++import org.slf4j.Logger; ++import java.io.IOException; ++import java.lang.invoke.VarHandle; ++import java.util.concurrent.CompletableFuture; ++import java.util.concurrent.CompletionException; ++import java.util.concurrent.ConcurrentHashMap; ++import java.util.concurrent.atomic.AtomicInteger; ++import java.util.function.BiConsumer; ++import java.util.function.BiFunction; ++import java.util.function.Consumer; ++import java.util.function.Function; ++ ++/** ++ * Prioritised RegionFile I/O executor, responsible for all RegionFile access. ++ * <p> ++ * All functions provided are MT-Safe, however certain ordering constraints are recommended: ++ * <ul> ++ * <li> ++ * Chunk saves may not occur for unloaded chunks. ++ * </li> ++ * <li> ++ * Tasks must be scheduled on the chunk scheduler thread. ++ * </li> ++ * </ul> ++ * By following these constraints, no chunk data loss should occur with the exception of underlying I/O problems. ++ */ ++public final class RegionFileIOThread extends PrioritisedQueueExecutorThread { ++ ++ private static final Logger LOGGER = LogUtils.getClassLogger(); ++ ++ /** ++ * The kinds of region files controlled by the region file thread. Add more when needed, and ensure ++ * getControllerFor is updated. ++ */ ++ public static enum RegionFileType { ++ CHUNK_DATA, ++ POI_DATA, ++ ENTITY_DATA; ++ } ++ ++ protected static final RegionFileType[] CACHED_REGIONFILE_TYPES = RegionFileType.values(); ++ ++ private ChunkDataController getControllerFor(final ServerLevel world, final RegionFileType type) { ++ return switch (type) { ++ case CHUNK_DATA -> world.chunkDataControllerNew; ++ case POI_DATA -> world.poiDataControllerNew; ++ case ENTITY_DATA -> world.entityDataControllerNew; ++ default -> throw new IllegalStateException("Unknown controller type " + type); ++ }; ++ } ++ ++ /** ++ * Collects regionfile data for a certain chunk. ++ */ ++ public static final class RegionFileData { ++ ++ private final boolean[] hasResult = new boolean[CACHED_REGIONFILE_TYPES.length]; ++ private final CompoundTag[] data = new CompoundTag[CACHED_REGIONFILE_TYPES.length]; ++ private final Throwable[] throwables = new Throwable[CACHED_REGIONFILE_TYPES.length]; ++ ++ /** ++ * Sets the result associated with the specified regionfile type. Note that ++ * results can only be set once per regionfile type. ++ * ++ * @param type The regionfile type. ++ * @param data The result to set. ++ */ ++ public void setData(final RegionFileType type, final CompoundTag data) { ++ final int index = type.ordinal(); ++ ++ if (this.hasResult[index]) { ++ throw new IllegalArgumentException("Result already exists for type " + type); ++ } ++ this.hasResult[index] = true; ++ this.data[index] = data; ++ } ++ ++ /** ++ * Sets the result associated with the specified regionfile type. Note that ++ * results can only be set once per regionfile type. ++ * ++ * @param type The regionfile type. ++ * @param throwable The result to set. ++ */ ++ public void setThrowable(final RegionFileType type, final Throwable throwable) { ++ final int index = type.ordinal(); ++ ++ if (this.hasResult[index]) { ++ throw new IllegalArgumentException("Result already exists for type " + type); ++ } ++ this.hasResult[index] = true; ++ this.throwables[index] = throwable; ++ } ++ ++ /** ++ * Returns whether there is a result for the specified regionfile type. ++ * ++ * @param type Specified regionfile type. ++ * ++ * @return Whether a result exists for {@code type}. ++ */ ++ public boolean hasResult(final RegionFileType type) { ++ return this.hasResult[type.ordinal()]; ++ } ++ ++ /** ++ * Returns the data result for the regionfile type. ++ * ++ * @param type Specified regionfile type. ++ * ++ * @throws IllegalArgumentException If the result has not been set for {@code type}. ++ * @return The data result for the specified type. If the result is a {@code Throwable}, ++ * then returns {@code null}. ++ */ ++ public CompoundTag getData(final RegionFileType type) { ++ final int index = type.ordinal(); ++ ++ if (!this.hasResult[index]) { ++ throw new IllegalArgumentException("Result does not exist for type " + type); ++ } ++ ++ return this.data[index]; ++ } ++ ++ /** ++ * Returns the throwable result for the regionfile type. ++ * ++ * @param type Specified regionfile type. ++ * ++ * @throws IllegalArgumentException If the result has not been set for {@code type}. ++ * @return The throwable result for the specified type. If the result is an {@code CompoundTag}, ++ * then returns {@code null}. ++ */ ++ public Throwable getThrowable(final RegionFileType type) { ++ final int index = type.ordinal(); ++ ++ if (!this.hasResult[index]) { ++ throw new IllegalArgumentException("Result does not exist for type " + type); ++ } ++ ++ return this.throwables[index]; ++ } ++ } ++ ++ private static final Object INIT_LOCK = new Object(); ++ ++ static RegionFileIOThread[] threads; ++ ++ /* needs to be consistent given a set of parameters */ ++ static RegionFileIOThread selectThread(final ServerLevel world, final int chunkX, final int chunkZ, final RegionFileType type) { ++ if (threads == null) { ++ throw new IllegalStateException("Threads not initialised"); ++ } ++ ++ final int regionX = chunkX >> 5; ++ final int regionZ = chunkZ >> 5; ++ final int typeOffset = type.ordinal(); ++ ++ return threads[(System.identityHashCode(world) + regionX + regionZ + typeOffset) % threads.length]; ++ } ++ ++ /** ++ * Shuts down the I/O executor(s). Watis for all tasks to complete if specified. ++ * Tasks queued during this call might not be accepted, and tasks queued after will not be accepted. ++ * ++ * @param wait Whether to wait until all tasks have completed. ++ */ ++ public static void close(final boolean wait) { ++ for (int i = 0, len = threads.length; i < len; ++i) { ++ threads[i].close(false, true); ++ } ++ if (wait) { ++ RegionFileIOThread.flush(); ++ } ++ } ++ ++ public static long[] getExecutedTasks() { ++ final long[] ret = new long[threads.length]; ++ for (int i = 0, len = threads.length; i < len; ++i) { ++ ret[i] = threads[i].getTotalTasksExecuted(); ++ } ++ ++ return ret; ++ } ++ ++ public static long[] getTasksScheduled() { ++ final long[] ret = new long[threads.length]; ++ for (int i = 0, len = threads.length; i < len; ++i) { ++ ret[i] = threads[i].getTotalTasksScheduled(); ++ } ++ return ret; ++ } ++ ++ public static void flush() { ++ for (int i = 0, len = threads.length; i < len; ++i) { ++ threads[i].waitUntilAllExecuted(); ++ } ++ } ++ ++ public static void partialFlush(final int totalTasksRemaining) { ++ long failures = 1L; // start out at 0.25ms ++ ++ for (;;) { ++ final long[] executed = getExecutedTasks(); ++ final long[] scheduled = getTasksScheduled(); ++ ++ long sum = 0; ++ for (int i = 0; i < executed.length; ++i) { ++ sum += scheduled[i] - executed[i]; ++ } ++ ++ if (sum <= totalTasksRemaining) { ++ break; ++ } ++ ++ failures = ConcurrentUtil.linearLongBackoff(failures, 250_000L, 5_000_000L); // 500us, 5ms ++ } ++ } ++ ++ /** ++ * Inits the executor with the specified number of threads. ++ * ++ * @param threads Specified number of threads. ++ */ ++ public static void init(final int threads) { ++ synchronized (INIT_LOCK) { ++ if (RegionFileIOThread.threads != null) { ++ throw new IllegalStateException("Already initialised threads"); ++ } ++ ++ RegionFileIOThread.threads = new RegionFileIOThread[threads]; ++ ++ for (int i = 0; i < threads; ++i) { ++ RegionFileIOThread.threads[i] = new RegionFileIOThread(i); ++ RegionFileIOThread.threads[i].start(); ++ } ++ } ++ } ++ ++ private RegionFileIOThread(final int threadNumber) { ++ super(new PrioritisedThreadedTaskQueue(), (int)(1.0e6)); // 1.0ms spinwait time ++ this.setName("RegionFile I/O Thread #" + threadNumber); ++ this.setPriority(Thread.NORM_PRIORITY - 2); // we keep priority close to normal because threads can wait on us ++ this.setUncaughtExceptionHandler((final Thread thread, final Throwable thr) -> { ++ LOGGER.error("Uncaught exception thrown from I/O thread, report this! Thread: " + thread.getName(), thr); ++ }); ++ } ++ ++ /** ++ * Returns whether the current thread is a regionfile I/O executor. ++ * @return Whether the current thread is a regionfile I/O executor. ++ */ ++ public static boolean isRegionFileThread() { ++ return Thread.currentThread() instanceof RegionFileIOThread; ++ } ++ ++ /** ++ * Returns the priority associated with blocking I/O based on the current thread. The goal is to avoid ++ * dumb plugins from taking away priority from threads we consider crucial. ++ * @return The priroity to use with blocking I/O on the current thread. ++ */ ++ public static PrioritisedExecutor.Priority getIOBlockingPriorityForCurrentThread() { ++ if (TickThread.isTickThread()) { ++ return PrioritisedExecutor.Priority.BLOCKING; ++ } ++ return PrioritisedExecutor.Priority.HIGHEST; ++ } ++ ++ /** ++ * Returns the current {@code CompoundTag} pending for write for the specified chunk and regionfile type. ++ * Note that this does not copy the result, so do not modify the result returned. ++ * ++ * @param world Specified world. ++ * @param chunkX Specified chunk x. ++ * @param chunkZ Specified chunk z. ++ * @param type Specified regionfile type. ++ * ++ * @return The compound tag associated for the specified chunk. {@code null} if no write was pending, or if {@code null} is the write pending. ++ */ ++ public static CompoundTag getPendingWrite(final ServerLevel world, final int chunkX, final int chunkZ, final RegionFileType type) { ++ final RegionFileIOThread thread = RegionFileIOThread.selectThread(world, chunkX, chunkZ, type); ++ return thread.getPendingWriteInternal(world, chunkX, chunkZ, type); ++ } ++ ++ CompoundTag getPendingWriteInternal(final ServerLevel world, final int chunkX, final int chunkZ, final RegionFileType type) { ++ final ChunkDataController taskController = this.getControllerFor(world, type); ++ final ChunkDataTask task = taskController.tasks.get(Long.valueOf(CoordinateUtils.getChunkKey(chunkX, chunkZ))); ++ ++ if (task == null) { ++ return null; ++ } ++ ++ final CompoundTag ret = task.inProgressWrite; ++ ++ return ret == ChunkDataTask.NOTHING_TO_WRITE ? null : ret; ++ } ++ ++ /** ++ * Returns the priority for the specified regionfile type for the specified chunk. ++ * @param world Specified world. ++ * @param chunkX Specified chunk x. ++ * @param chunkZ Specified chunk z. ++ * @param type Specified regionfile type. ++ * @return The priority for the chunk ++ */ ++ public static PrioritisedExecutor.Priority getPriority(final ServerLevel world, final int chunkX, final int chunkZ, final RegionFileType type) { ++ final RegionFileIOThread thread = RegionFileIOThread.selectThread(world, chunkX, chunkZ, type); ++ return thread.getPriorityInternal(world, chunkX, chunkZ, type); ++ } ++ ++ PrioritisedExecutor.Priority getPriorityInternal(final ServerLevel world, final int chunkX, final int chunkZ, final RegionFileType type) { ++ final ChunkDataController taskController = this.getControllerFor(world, type); ++ final ChunkDataTask task = taskController.tasks.get(Long.valueOf(CoordinateUtils.getChunkKey(chunkX, chunkZ))); ++ ++ if (task == null) { ++ return PrioritisedExecutor.Priority.COMPLETING; ++ } ++ ++ return task.prioritisedTask.getPriority(); ++ } ++ ++ /** ++ * Sets the priority for all regionfile types for the specified chunk. Note that great care should ++ * be taken using this method, as there can be multiple tasks tied to the same chunk that want different ++ * priorities. ++ * ++ * @param world Specified world. ++ * @param chunkX Specified chunk x. ++ * @param chunkZ Specified chunk z. ++ * @param priority New priority. ++ * ++ * @see #raisePriority(ServerLevel, int, int, Priority) ++ * @see #raisePriority(ServerLevel, int, int, RegionFileType, Priority) ++ * @see #lowerPriority(ServerLevel, int, int, Priority) ++ * @see #lowerPriority(ServerLevel, int, int, RegionFileType, Priority) ++ */ ++ public static void setPriority(final ServerLevel world, final int chunkX, final int chunkZ, ++ final PrioritisedExecutor.Priority priority) { ++ for (final RegionFileType type : CACHED_REGIONFILE_TYPES) { ++ RegionFileIOThread.setPriority(world, chunkX, chunkZ, type, priority); ++ } ++ } ++ ++ /** ++ * Sets the priority for the specified regionfile type for the specified chunk. Note that great care should ++ * be taken using this method, as there can be multiple tasks tied to the same chunk that want different ++ * priorities. ++ * ++ * @param world Specified world. ++ * @param chunkX Specified chunk x. ++ * @param chunkZ Specified chunk z. ++ * @param type Specified regionfile type. ++ * @param priority New priority. ++ * ++ * @see #raisePriority(ServerLevel, int, int, Priority) ++ * @see #raisePriority(ServerLevel, int, int, RegionFileType, Priority) ++ * @see #lowerPriority(ServerLevel, int, int, Priority) ++ * @see #lowerPriority(ServerLevel, int, int, RegionFileType, Priority) ++ */ ++ public static void setPriority(final ServerLevel world, final int chunkX, final int chunkZ, final RegionFileType type, ++ final PrioritisedExecutor.Priority priority) { ++ final RegionFileIOThread thread = RegionFileIOThread.selectThread(world, chunkX, chunkZ, type); ++ thread.setPriorityInternal(world, chunkX, chunkZ, type, priority); ++ } ++ ++ void setPriorityInternal(final ServerLevel world, final int chunkX, final int chunkZ, final RegionFileType type, ++ final PrioritisedExecutor.Priority priority) { ++ final ChunkDataController taskController = this.getControllerFor(world, type); ++ final ChunkDataTask task = taskController.tasks.get(Long.valueOf(CoordinateUtils.getChunkKey(chunkX, chunkZ))); ++ ++ if (task != null) { ++ task.prioritisedTask.setPriority(priority); ++ } ++ } ++ ++ /** ++ * Raises the priority for all regionfile types for the specified chunk. ++ * ++ * @param world Specified world. ++ * @param chunkX Specified chunk x. ++ * @param chunkZ Specified chunk z. ++ * @param priority New priority. ++ * ++ * @see #setPriority(ServerLevel, int, int, Priority) ++ * @see #setPriority(ServerLevel, int, int, RegionFileType, Priority) ++ * @see #lowerPriority(ServerLevel, int, int, Priority) ++ * @see #lowerPriority(ServerLevel, int, int, RegionFileType, Priority) ++ */ ++ public static void raisePriority(final ServerLevel world, final int chunkX, final int chunkZ, ++ final PrioritisedExecutor.Priority priority) { ++ for (final RegionFileType type : CACHED_REGIONFILE_TYPES) { ++ RegionFileIOThread.raisePriority(world, chunkX, chunkZ, type, priority); ++ } ++ } ++ ++ /** ++ * Raises the priority for the specified regionfile type for the specified chunk. ++ * ++ * @param world Specified world. ++ * @param chunkX Specified chunk x. ++ * @param chunkZ Specified chunk z. ++ * @param type Specified regionfile type. ++ * @param priority New priority. ++ * ++ * @see #setPriority(ServerLevel, int, int, Priority) ++ * @see #setPriority(ServerLevel, int, int, RegionFileType, Priority) ++ * @see #lowerPriority(ServerLevel, int, int, Priority) ++ * @see #lowerPriority(ServerLevel, int, int, RegionFileType, Priority) ++ */ ++ public static void raisePriority(final ServerLevel world, final int chunkX, final int chunkZ, final RegionFileType type, ++ final PrioritisedExecutor.Priority priority) { ++ final RegionFileIOThread thread = RegionFileIOThread.selectThread(world, chunkX, chunkZ, type); ++ thread.raisePriorityInternal(world, chunkX, chunkZ, type, priority); ++ } ++ ++ void raisePriorityInternal(final ServerLevel world, final int chunkX, final int chunkZ, final RegionFileType type, ++ final PrioritisedExecutor.Priority priority) { ++ final ChunkDataController taskController = this.getControllerFor(world, type); ++ final ChunkDataTask task = taskController.tasks.get(Long.valueOf(CoordinateUtils.getChunkKey(chunkX, chunkZ))); ++ ++ if (task != null) { ++ task.prioritisedTask.raisePriority(priority); ++ } ++ } ++ ++ /** ++ * Lowers the priority for all regionfile types for the specified chunk. ++ * ++ * @param world Specified world. ++ * @param chunkX Specified chunk x. ++ * @param chunkZ Specified chunk z. ++ * @param priority New priority. ++ * ++ * @see #raisePriority(ServerLevel, int, int, Priority) ++ * @see #raisePriority(ServerLevel, int, int, RegionFileType, Priority) ++ * @see #setPriority(ServerLevel, int, int, Priority) ++ * @see #setPriority(ServerLevel, int, int, RegionFileType, Priority) ++ */ ++ public static void lowerPriority(final ServerLevel world, final int chunkX, final int chunkZ, ++ final PrioritisedExecutor.Priority priority) { ++ for (final RegionFileType type : CACHED_REGIONFILE_TYPES) { ++ RegionFileIOThread.lowerPriority(world, chunkX, chunkZ, type, priority); ++ } ++ } ++ ++ /** ++ * Lowers the priority for the specified regionfile type for the specified chunk. ++ * ++ * @param world Specified world. ++ * @param chunkX Specified chunk x. ++ * @param chunkZ Specified chunk z. ++ * @param type Specified regionfile type. ++ * @param priority New priority. ++ * ++ * @see #raisePriority(ServerLevel, int, int, Priority) ++ * @see #raisePriority(ServerLevel, int, int, RegionFileType, Priority) ++ * @see #setPriority(ServerLevel, int, int, Priority) ++ * @see #setPriority(ServerLevel, int, int, RegionFileType, Priority) ++ */ ++ public static void lowerPriority(final ServerLevel world, final int chunkX, final int chunkZ, final RegionFileType type, ++ final PrioritisedExecutor.Priority priority) { ++ final RegionFileIOThread thread = RegionFileIOThread.selectThread(world, chunkX, chunkZ, type); ++ thread.lowerPriorityInternal(world, chunkX, chunkZ, type, priority); ++ } ++ ++ void lowerPriorityInternal(final ServerLevel world, final int chunkX, final int chunkZ, final RegionFileType type, ++ final PrioritisedExecutor.Priority priority) { ++ final ChunkDataController taskController = this.getControllerFor(world, type); ++ final ChunkDataTask task = taskController.tasks.get(Long.valueOf(CoordinateUtils.getChunkKey(chunkX, chunkZ))); ++ ++ if (task != null) { ++ task.prioritisedTask.lowerPriority(priority); ++ } ++ } ++ ++ /** ++ * Schedules the chunk data to be written asynchronously. ++ * <p> ++ * Impl notes: ++ * <ul> ++ * <li> ++ * This function presumes a chunk load for the coordinates is not called during this function (anytime after is OK). This means ++ * saves must be scheduled before a chunk is unloaded. ++ * </li> ++ * <li> ++ * Writes may be called concurrently, although only the "later" write will go through. ++ * </li> ++ * </ul> ++ * ++ * @param world Chunk's world ++ * @param chunkX Chunk's x coordinate ++ * @param chunkZ Chunk's z coordinate ++ * @param data Chunk's data ++ * @param type The regionfile type to write to. ++ * ++ * @throws IllegalStateException If the file io thread has shutdown. ++ */ ++ public static void scheduleSave(final ServerLevel world, final int chunkX, final int chunkZ, final CompoundTag data, ++ final RegionFileType type) { ++ RegionFileIOThread.scheduleSave(world, chunkX, chunkZ, data, type, PrioritisedExecutor.Priority.NORMAL); ++ } ++ ++ /** ++ * Schedules the chunk data to be written asynchronously. ++ * <p> ++ * Impl notes: ++ * <ul> ++ * <li> ++ * This function presumes a chunk load for the coordinates is not called during this function (anytime after is OK). This means ++ * saves must be scheduled before a chunk is unloaded. ++ * </li> ++ * <li> ++ * Writes may be called concurrently, although only the "later" write will go through. ++ * </li> ++ * </ul> ++ * ++ * @param world Chunk's world ++ * @param chunkX Chunk's x coordinate ++ * @param chunkZ Chunk's z coordinate ++ * @param data Chunk's data ++ * @param type The regionfile type to write to. ++ * @param priority The minimum priority to schedule at. ++ * ++ * @throws IllegalStateException If the file io thread has shutdown. ++ */ ++ public static void scheduleSave(final ServerLevel world, final int chunkX, final int chunkZ, final CompoundTag data, ++ final RegionFileType type, final PrioritisedExecutor.Priority priority) { ++ final RegionFileIOThread thread = RegionFileIOThread.selectThread(world, chunkX, chunkZ, type); ++ thread.scheduleSaveInternal(world, chunkX, chunkZ, data, type, priority); ++ } ++ ++ void scheduleSaveInternal(final ServerLevel world, final int chunkX, final int chunkZ, final CompoundTag data, ++ final RegionFileType type, final PrioritisedExecutor.Priority priority) { ++ final ChunkDataController taskController = this.getControllerFor(world, type); ++ ++ final boolean[] created = new boolean[1]; ++ final ChunkCoordinate key = new ChunkCoordinate(CoordinateUtils.getChunkKey(chunkX, chunkZ)); ++ final ChunkDataTask task = taskController.tasks.compute(key, (final ChunkCoordinate keyInMap, final ChunkDataTask taskRunning) -> { ++ if (taskRunning == null || taskRunning.failedWrite) { ++ // no task is scheduled or the previous write failed - meaning we need to overwrite it ++ ++ // create task ++ final ChunkDataTask newTask = new ChunkDataTask(world, chunkX, chunkZ, taskController, RegionFileIOThread.this, priority); ++ newTask.inProgressWrite = data; ++ created[0] = true; ++ ++ return newTask; ++ } ++ ++ taskRunning.inProgressWrite = data; ++ ++ return taskRunning; ++ }); ++ ++ if (created[0]) { ++ task.prioritisedTask.queue(); ++ } else { ++ task.prioritisedTask.raisePriority(priority); ++ } ++ } ++ ++ /** ++ * Schedules a load to be executed asynchronously. This task will load all regionfile types, and then call ++ * {@code onComplete}. This is a bulk load operation, see {@link #loadDataAsync(ServerLevel, int, int, RegionFileType, BiConsumer, boolean)} ++ * for single load. ++ * <p> ++ * Impl notes: ++ * <ul> ++ * <li> ++ * The {@code onComplete} parameter may be completed during the execution of this function synchronously or it may ++ * be completed asynchronously on this file io thread. Interacting with the file IO thread in the completion of ++ * data is undefined behaviour, and can cause deadlock. ++ * </li> ++ * </ul> ++ * ++ * @param world Chunk's world ++ * @param chunkX Chunk's x coordinate ++ * @param chunkZ Chunk's z coordinate ++ * @param onComplete Consumer to execute once this task has completed ++ * @param intendingToBlock Whether the caller is intending to block on completion. This only affects the cost ++ * of this call. ++ * ++ * @return The {@link Cancellable} for this chunk load. Cancelling it will not affect other loads for the same chunk data. ++ * ++ * @see #loadDataAsync(ServerLevel, int, int, RegionFileType, BiConsumer, boolean) ++ * @see #loadDataAsync(ServerLevel, int, int, RegionFileType, BiConsumer, boolean, Priority) ++ * @see #loadChunkData(ServerLevel, int, int, Consumer, boolean, RegionFileType...) ++ * @see #loadChunkData(ServerLevel, int, int, Consumer, boolean, Priority, RegionFileType...) ++ */ ++ public static Cancellable loadAllChunkData(final ServerLevel world, final int chunkX, final int chunkZ, ++ final Consumer<RegionFileData> onComplete, final boolean intendingToBlock) { ++ return RegionFileIOThread.loadAllChunkData(world, chunkX, chunkZ, onComplete, intendingToBlock, PrioritisedExecutor.Priority.NORMAL); ++ } ++ ++ /** ++ * Schedules a load to be executed asynchronously. This task will load all regionfile types, and then call ++ * {@code onComplete}. This is a bulk load operation, see {@link #loadDataAsync(ServerLevel, int, int, RegionFileType, BiConsumer, boolean, Priority)} ++ * for single load. ++ * <p> ++ * Impl notes: ++ * <ul> ++ * <li> ++ * The {@code onComplete} parameter may be completed during the execution of this function synchronously or it may ++ * be completed asynchronously on this file io thread. Interacting with the file IO thread in the completion of ++ * data is undefined behaviour, and can cause deadlock. ++ * </li> ++ * </ul> ++ * ++ * @param world Chunk's world ++ * @param chunkX Chunk's x coordinate ++ * @param chunkZ Chunk's z coordinate ++ * @param onComplete Consumer to execute once this task has completed ++ * @param intendingToBlock Whether the caller is intending to block on completion. This only affects the cost ++ * of this call. ++ * @param priority The minimum priority to load the data at. ++ * ++ * @return The {@link Cancellable} for this chunk load. Cancelling it will not affect other loads for the same chunk data. ++ * ++ * @see #loadDataAsync(ServerLevel, int, int, RegionFileType, BiConsumer, boolean) ++ * @see #loadDataAsync(ServerLevel, int, int, RegionFileType, BiConsumer, boolean, Priority) ++ * @see #loadChunkData(ServerLevel, int, int, Consumer, boolean, RegionFileType...) ++ * @see #loadChunkData(ServerLevel, int, int, Consumer, boolean, Priority, RegionFileType...) ++ */ ++ public static Cancellable loadAllChunkData(final ServerLevel world, final int chunkX, final int chunkZ, ++ final Consumer<RegionFileData> onComplete, final boolean intendingToBlock, ++ final PrioritisedExecutor.Priority priority) { ++ return RegionFileIOThread.loadChunkData(world, chunkX, chunkZ, onComplete, intendingToBlock, priority, CACHED_REGIONFILE_TYPES); ++ } ++ ++ /** ++ * Schedules a load to be executed asynchronously. This task will load data for the specified regionfile type(s), and ++ * then call {@code onComplete}. This is a bulk load operation, see {@link #loadDataAsync(ServerLevel, int, int, RegionFileType, BiConsumer, boolean)} ++ * for single load. ++ * <p> ++ * Impl notes: ++ * <ul> ++ * <li> ++ * The {@code onComplete} parameter may be completed during the execution of this function synchronously or it may ++ * be completed asynchronously on this file io thread. Interacting with the file IO thread in the completion of ++ * data is undefined behaviour, and can cause deadlock. ++ * </li> ++ * </ul> ++ * ++ * @param world Chunk's world ++ * @param chunkX Chunk's x coordinate ++ * @param chunkZ Chunk's z coordinate ++ * @param onComplete Consumer to execute once this task has completed ++ * @param intendingToBlock Whether the caller is intending to block on completion. This only affects the cost ++ * of this call. ++ * @param types The regionfile type(s) to load. ++ * ++ * @return The {@link Cancellable} for this chunk load. Cancelling it will not affect other loads for the same chunk data. ++ * ++ * @see #loadDataAsync(ServerLevel, int, int, RegionFileType, BiConsumer, boolean) ++ * @see #loadDataAsync(ServerLevel, int, int, RegionFileType, BiConsumer, boolean, Priority) ++ * @see #loadAllChunkData(ServerLevel, int, int, Consumer, boolean) ++ * @see #loadAllChunkData(ServerLevel, int, int, Consumer, boolean, Priority) ++ */ ++ public static Cancellable loadChunkData(final ServerLevel world, final int chunkX, final int chunkZ, ++ final Consumer<RegionFileData> onComplete, final boolean intendingToBlock, ++ final RegionFileType... types) { ++ return RegionFileIOThread.loadChunkData(world, chunkX, chunkZ, onComplete, intendingToBlock, PrioritisedExecutor.Priority.NORMAL, types); ++ } ++ ++ /** ++ * Schedules a load to be executed asynchronously. This task will load data for the specified regionfile type(s), and ++ * then call {@code onComplete}. This is a bulk load operation, see {@link #loadDataAsync(ServerLevel, int, int, RegionFileType, BiConsumer, boolean, Priority)} ++ * for single load. ++ * <p> ++ * Impl notes: ++ * <ul> ++ * <li> ++ * The {@code onComplete} parameter may be completed during the execution of this function synchronously or it may ++ * be completed asynchronously on this file io thread. Interacting with the file IO thread in the completion of ++ * data is undefined behaviour, and can cause deadlock. ++ * </li> ++ * </ul> ++ * ++ * @param world Chunk's world ++ * @param chunkX Chunk's x coordinate ++ * @param chunkZ Chunk's z coordinate ++ * @param onComplete Consumer to execute once this task has completed ++ * @param intendingToBlock Whether the caller is intending to block on completion. This only affects the cost ++ * of this call. ++ * @param types The regionfile type(s) to load. ++ * @param priority The minimum priority to load the data at. ++ * ++ * @return The {@link Cancellable} for this chunk load. Cancelling it will not affect other loads for the same chunk data. ++ * ++ * @see #loadDataAsync(ServerLevel, int, int, RegionFileType, BiConsumer, boolean) ++ * @see #loadDataAsync(ServerLevel, int, int, RegionFileType, BiConsumer, boolean, Priority) ++ * @see #loadAllChunkData(ServerLevel, int, int, Consumer, boolean) ++ * @see #loadAllChunkData(ServerLevel, int, int, Consumer, boolean, Priority) ++ */ ++ public static Cancellable loadChunkData(final ServerLevel world, final int chunkX, final int chunkZ, ++ final Consumer<RegionFileData> onComplete, final boolean intendingToBlock, ++ final PrioritisedExecutor.Priority priority, final RegionFileType... types) { ++ if (types == null) { ++ throw new NullPointerException("Types cannot be null"); ++ } ++ if (types.length == 0) { ++ throw new IllegalArgumentException("Types cannot be empty"); ++ } ++ ++ final RegionFileData ret = new RegionFileData(); ++ ++ final Cancellable[] reads = new CancellableRead[types.length]; ++ final AtomicInteger completions = new AtomicInteger(); ++ final int expectedCompletions = types.length; ++ ++ for (int i = 0; i < expectedCompletions; ++i) { ++ final RegionFileType type = types[i]; ++ reads[i] = RegionFileIOThread.loadDataAsync(world, chunkX, chunkZ, type, ++ (final CompoundTag data, final Throwable throwable) -> { ++ if (throwable != null) { ++ ret.setThrowable(type, throwable); ++ } else { ++ ret.setData(type, data); ++ } ++ ++ if (completions.incrementAndGet() == expectedCompletions) { ++ onComplete.accept(ret); ++ } ++ }, intendingToBlock, priority); ++ } ++ ++ return new CancellableReads(reads); ++ } ++ ++ /** ++ * Schedules a load to be executed asynchronously. This task will load the specified regionfile type, and then call ++ * {@code onComplete}. ++ * <p> ++ * Impl notes: ++ * <ul> ++ * <li> ++ * The {@code onComplete} parameter may be completed during the execution of this function synchronously or it may ++ * be completed asynchronously on this file io thread. Interacting with the file IO thread in the completion of ++ * data is undefined behaviour, and can cause deadlock. ++ * </li> ++ * </ul> ++ * ++ * @param world Chunk's world ++ * @param chunkX Chunk's x coordinate ++ * @param chunkZ Chunk's z coordinate ++ * @param onComplete Consumer to execute once this task has completed ++ * @param intendingToBlock Whether the caller is intending to block on completion. This only affects the cost ++ * of this call. ++ * ++ * @return The {@link Cancellable} for this chunk load. Cancelling it will not affect other loads for the same chunk data. ++ * ++ * @see #loadChunkData(ServerLevel, int, int, Consumer, boolean, RegionFileType...) ++ * @see #loadChunkData(ServerLevel, int, int, Consumer, boolean, Priority, RegionFileType...) ++ * @see #loadAllChunkData(ServerLevel, int, int, Consumer, boolean) ++ * @see #loadAllChunkData(ServerLevel, int, int, Consumer, boolean, Priority) ++ */ ++ public static Cancellable loadDataAsync(final ServerLevel world, final int chunkX, final int chunkZ, ++ final RegionFileType type, final BiConsumer<CompoundTag, Throwable> onComplete, ++ final boolean intendingToBlock) { ++ return RegionFileIOThread.loadDataAsync(world, chunkX, chunkZ, type, onComplete, intendingToBlock, PrioritisedExecutor.Priority.NORMAL); ++ } ++ ++ /** ++ * Schedules a load to be executed asynchronously. This task will load the specified regionfile type, and then call ++ * {@code onComplete}. ++ * <p> ++ * Impl notes: ++ * <ul> ++ * <li> ++ * The {@code onComplete} parameter may be completed during the execution of this function synchronously or it may ++ * be completed asynchronously on this file io thread. Interacting with the file IO thread in the completion of ++ * data is undefined behaviour, and can cause deadlock. ++ * </li> ++ * </ul> ++ * ++ * @param world Chunk's world ++ * @param chunkX Chunk's x coordinate ++ * @param chunkZ Chunk's z coordinate ++ * @param onComplete Consumer to execute once this task has completed ++ * @param intendingToBlock Whether the caller is intending to block on completion. This only affects the cost ++ * of this call. ++ * @param priority Minimum priority to load the data at. ++ * ++ * @return The {@link Cancellable} for this chunk load. Cancelling it will not affect other loads for the same chunk data. ++ * ++ * @see #loadChunkData(ServerLevel, int, int, Consumer, boolean, RegionFileType...) ++ * @see #loadChunkData(ServerLevel, int, int, Consumer, boolean, Priority, RegionFileType...) ++ * @see #loadAllChunkData(ServerLevel, int, int, Consumer, boolean) ++ * @see #loadAllChunkData(ServerLevel, int, int, Consumer, boolean, Priority) ++ */ ++ public static Cancellable loadDataAsync(final ServerLevel world, final int chunkX, final int chunkZ, ++ final RegionFileType type, final BiConsumer<CompoundTag, Throwable> onComplete, ++ final boolean intendingToBlock, final PrioritisedExecutor.Priority priority) { ++ final RegionFileIOThread thread = RegionFileIOThread.selectThread(world, chunkX, chunkZ, type); ++ return thread.loadDataAsyncInternal(world, chunkX, chunkZ, type, onComplete, intendingToBlock, priority); ++ } ++ ++ private static Boolean doesRegionFileExist(final int chunkX, final int chunkZ, final boolean intendingToBlock, ++ final ChunkDataController taskController) { ++ final ChunkPos chunkPos = new ChunkPos(chunkX, chunkZ); ++ if (intendingToBlock) { ++ return taskController.computeForRegionFile(chunkX, chunkZ, true, (final RegionFile file) -> { ++ if (file == null) { // null if no regionfile exists ++ return Boolean.FALSE; ++ } ++ ++ return file.hasChunk(chunkPos) ? Boolean.TRUE : Boolean.FALSE; ++ }); ++ } else { ++ // first check if the region file for sure does not exist ++ if (taskController.doesRegionFileNotExist(chunkX, chunkZ)) { ++ return Boolean.FALSE; ++ } // else: it either exists or is not known, fall back to checking the loaded region file ++ ++ return taskController.computeForRegionFileIfLoaded(chunkX, chunkZ, (final RegionFile file) -> { ++ if (file == null) { // null if not loaded ++ // not sure at this point, let the I/O thread figure it out ++ return Boolean.TRUE; ++ } ++ ++ return file.hasChunk(chunkPos) ? Boolean.TRUE : Boolean.FALSE; ++ }); ++ } ++ } ++ ++ Cancellable loadDataAsyncInternal(final ServerLevel world, final int chunkX, final int chunkZ, ++ final RegionFileType type, final BiConsumer<CompoundTag, Throwable> onComplete, ++ final boolean intendingToBlock, final PrioritisedExecutor.Priority priority) { ++ final ChunkDataController taskController = this.getControllerFor(world, type); ++ ++ final ImmediateCallbackCompletion callbackInfo = new ImmediateCallbackCompletion(); ++ ++ final ChunkCoordinate key = new ChunkCoordinate(CoordinateUtils.getChunkKey(chunkX, chunkZ)); ++ final BiFunction<ChunkCoordinate, ChunkDataTask, ChunkDataTask> compute = (final ChunkCoordinate keyInMap, final ChunkDataTask running) -> { ++ if (running == null) { ++ // not scheduled ++ ++ if (callbackInfo.regionFileCalculation == null) { ++ // caller will compute this outside of compute(), to avoid holding the bin lock ++ callbackInfo.needsRegionFileTest = true; ++ return null; ++ } ++ ++ if (callbackInfo.regionFileCalculation == Boolean.FALSE) { ++ // not on disk ++ callbackInfo.data = null; ++ callbackInfo.throwable = null; ++ callbackInfo.completeNow = true; ++ return null; ++ } ++ ++ // set up task ++ final ChunkDataTask newTask = new ChunkDataTask( ++ world, chunkX, chunkZ, taskController, RegionFileIOThread.this, priority ++ ); ++ newTask.inProgressRead = new RegionFileIOThread.InProgressRead(); ++ newTask.inProgressRead.waiters.add(onComplete); ++ ++ callbackInfo.tasksNeedsScheduling = true; ++ return newTask; ++ } ++ ++ final CompoundTag pendingWrite = running.inProgressWrite; ++ ++ if (pendingWrite == ChunkDataTask.NOTHING_TO_WRITE) { ++ // need to add to waiters here, because the regionfile thread will use compute() to lock and check for cancellations ++ if (!running.inProgressRead.addToWaiters(onComplete)) { ++ callbackInfo.data = running.inProgressRead.value; ++ callbackInfo.throwable = running.inProgressRead.throwable; ++ callbackInfo.completeNow = true; ++ } ++ return running; ++ } ++ // using the result sync here - don't bump priority ++ ++ // at this stage we have to use the in progress write's data to avoid an order issue ++ callbackInfo.data = pendingWrite; ++ callbackInfo.throwable = null; ++ callbackInfo.completeNow = true; ++ return running; ++ }; ++ ++ ChunkDataTask curr = taskController.tasks.get(key); ++ if (curr == null) { ++ callbackInfo.regionFileCalculation = doesRegionFileExist(chunkX, chunkZ, intendingToBlock, taskController); ++ } ++ ChunkDataTask ret = taskController.tasks.compute(key, compute); ++ if (callbackInfo.needsRegionFileTest) { ++ // curr isn't null but when we went into compute() it was ++ callbackInfo.regionFileCalculation = doesRegionFileExist(chunkX, chunkZ, intendingToBlock, taskController); ++ // now it should be fine ++ ret = taskController.tasks.compute(key, compute); ++ } ++ ++ // needs to be scheduled ++ if (callbackInfo.tasksNeedsScheduling) { ++ ret.prioritisedTask.queue(); ++ } else if (callbackInfo.completeNow) { ++ try { ++ onComplete.accept(callbackInfo.data, callbackInfo.throwable); ++ } catch (final ThreadDeath thr) { ++ throw thr; ++ } catch (final Throwable thr) { ++ LOGGER.error("Callback " + ConcurrentUtil.genericToString(onComplete) + " synchronously failed to handle chunk data for task " + ret.toString(), thr); ++ } ++ } else { ++ // we're waiting on a task we didn't schedule, so raise its priority to what we want ++ ret.prioritisedTask.raisePriority(priority); ++ } ++ ++ return new CancellableRead(onComplete, ret); ++ } ++ ++ /** ++ * Schedules a load task to be executed asynchronously, and blocks on that task. ++ * ++ * @param world Chunk's world ++ * @param chunkX Chunk's x coordinate ++ * @param chunkZ Chunk's z coordinate ++ * @param type Regionfile type ++ * @param priority Minimum priority to load the data at. ++ * ++ * @return The chunk data for the chunk. Note that a {@code null} result means the chunk or regionfile does not exist on disk. ++ * ++ * @throws IOException If the load fails for any reason ++ */ ++ public static CompoundTag loadData(final ServerLevel world, final int chunkX, final int chunkZ, final RegionFileType type, ++ final PrioritisedExecutor.Priority priority) throws IOException { ++ final CompletableFuture<CompoundTag> ret = new CompletableFuture<>(); ++ ++ RegionFileIOThread.loadDataAsync(world, chunkX, chunkZ, type, (final CompoundTag compound, final Throwable thr) -> { ++ if (thr != null) { ++ ret.completeExceptionally(thr); ++ } else { ++ ret.complete(compound); ++ } ++ }, true, priority); ++ ++ try { ++ return ret.join(); ++ } catch (final CompletionException ex) { ++ throw new IOException(ex); ++ } ++ } ++ ++ private static final class ImmediateCallbackCompletion { ++ ++ public CompoundTag data; ++ public Throwable throwable; ++ public boolean completeNow; ++ public boolean tasksNeedsScheduling; ++ public boolean needsRegionFileTest; ++ public Boolean regionFileCalculation; ++ ++ } ++ ++ static final class CancellableRead implements Cancellable { ++ ++ private BiConsumer<CompoundTag, Throwable> callback; ++ private RegionFileIOThread.ChunkDataTask task; ++ ++ CancellableRead(final BiConsumer<CompoundTag, Throwable> callback, final RegionFileIOThread.ChunkDataTask task) { ++ this.callback = callback; ++ this.task = task; ++ } ++ ++ @Override ++ public boolean cancel() { ++ final BiConsumer<CompoundTag, Throwable> callback = this.callback; ++ final RegionFileIOThread.ChunkDataTask task = this.task; ++ ++ if (callback == null || task == null) { ++ return false; ++ } ++ ++ this.callback = null; ++ this.task = null; ++ ++ final RegionFileIOThread.InProgressRead read = task.inProgressRead; ++ ++ // read can be null if no read was scheduled (i.e no regionfile existed or chunk in regionfile didn't) ++ return (read != null && read.waiters.remove(callback)); ++ } ++ } ++ ++ static final class CancellableReads implements Cancellable { ++ ++ private Cancellable[] reads; ++ ++ protected static final VarHandle READS_HANDLE = ConcurrentUtil.getVarHandle(CancellableReads.class, "reads", Cancellable[].class); ++ ++ CancellableReads(final Cancellable[] reads) { ++ this.reads = reads; ++ } ++ ++ @Override ++ public boolean cancel() { ++ final Cancellable[] reads = (Cancellable[])READS_HANDLE.getAndSet((CancellableReads)this, (Cancellable[])null); ++ ++ if (reads == null) { ++ return false; ++ } ++ ++ boolean ret = false; ++ ++ for (final Cancellable read : reads) { ++ ret |= read.cancel(); ++ } ++ ++ return ret; ++ } ++ } ++ ++ static final class InProgressRead { ++ ++ private static final Logger LOGGER = LogUtils.getClassLogger(); ++ ++ CompoundTag value; ++ Throwable throwable; ++ final MultiThreadedQueue<BiConsumer<CompoundTag, Throwable>> waiters = new MultiThreadedQueue<>(); ++ ++ // rets false if already completed (callback not invoked), true if callback was added ++ boolean addToWaiters(final BiConsumer<CompoundTag, Throwable> callback) { ++ return this.waiters.add(callback); ++ } ++ ++ void complete(final RegionFileIOThread.ChunkDataTask task, final CompoundTag value, final Throwable throwable) { ++ this.value = value; ++ this.throwable = throwable; ++ ++ BiConsumer<CompoundTag, Throwable> consumer; ++ while ((consumer = this.waiters.pollOrBlockAdds()) != null) { ++ try { ++ consumer.accept(value, throwable); ++ } catch (final ThreadDeath thr) { ++ throw thr; ++ } catch (final Throwable thr) { ++ LOGGER.error("Callback " + ConcurrentUtil.genericToString(consumer) + " failed to handle chunk data for task " + task.toString(), thr); ++ } ++ } ++ } ++ } ++ ++ /** ++ * Class exists to replace {@link Long} usages as keys inside non-fastutil hashtables. The hash for some Long {@code x} ++ * is defined as {@code (x >>> 32) ^ x}. Chunk keys as long values are defined as {@code ((chunkX & 0xFFFFFFFFL) | (chunkZ << 32))}, ++ * which means the hashcode as a Long value will be {@code chunkX ^ chunkZ}. Given that most chunks are created within a radius arounds players, ++ * this will lead to many hash collisions. So, this class uses a better hashing algorithm so that usage of ++ * non-fastutil collections is not degraded. ++ */ ++ public static final class ChunkCoordinate implements Comparable<ChunkCoordinate> { ++ ++ public final long key; ++ ++ public ChunkCoordinate(final long key) { ++ this.key = key; ++ } ++ ++ @Override ++ public int hashCode() { ++ return (int)HashCommon.mix(this.key); ++ } ++ ++ @Override ++ public boolean equals(final Object obj) { ++ if (this == obj) { ++ return true; ++ } ++ ++ if (!(obj instanceof ChunkCoordinate)) { ++ return false; ++ } ++ ++ final ChunkCoordinate other = (ChunkCoordinate)obj; ++ ++ return this.key == other.key; ++ } ++ ++ // This class is intended for HashMap/ConcurrentHashMap usage, which do treeify bin nodes if the chain ++ // is too large. So we should implement compareTo to help. ++ @Override ++ public int compareTo(final RegionFileIOThread.ChunkCoordinate other) { ++ return Long.compare(this.key, other.key); ++ } ++ ++ @Override ++ public String toString() { ++ return new ChunkPos(this.key).toString(); ++ } ++ } ++ ++ public static abstract class ChunkDataController { ++ ++ // ConcurrentHashMap synchronizes per chain, so reduce the chance of task's hashes colliding. ++ protected final ConcurrentHashMap<ChunkCoordinate, ChunkDataTask> tasks = new ConcurrentHashMap<>(8192, 0.10f); ++ ++ public final RegionFileType type; ++ ++ public ChunkDataController(final RegionFileType type) { ++ this.type = type; ++ } ++ ++ public abstract RegionFileStorage getCache(); ++ ++ public abstract void writeData(final int chunkX, final int chunkZ, final CompoundTag compound) throws IOException; ++ ++ public abstract CompoundTag readData(final int chunkX, final int chunkZ) throws IOException; ++ ++ public boolean hasTasks() { ++ return !this.tasks.isEmpty(); ++ } ++ ++ public boolean doesRegionFileNotExist(final int chunkX, final int chunkZ) { ++ return this.getCache().doesRegionFileNotExistNoIO(new ChunkPos(chunkX, chunkZ)); ++ } ++ ++ public <T> T computeForRegionFile(final int chunkX, final int chunkZ, final boolean existingOnly, final Function<RegionFile, T> function) { ++ final RegionFileStorage cache = this.getCache(); ++ final RegionFile regionFile; ++ synchronized (cache) { ++ try { ++ regionFile = cache.getRegionFile(new ChunkPos(chunkX, chunkZ), existingOnly, true); ++ } catch (final IOException ex) { ++ throw new RuntimeException(ex); ++ } ++ } ++ ++ try { ++ return function.apply(regionFile); ++ } finally { ++ if (regionFile != null) { ++ regionFile.fileLock.unlock(); ++ } ++ } ++ } ++ ++ public <T> T computeForRegionFileIfLoaded(final int chunkX, final int chunkZ, final Function<RegionFile, T> function) { ++ final RegionFileStorage cache = this.getCache(); ++ final RegionFile regionFile; ++ ++ synchronized (cache) { ++ regionFile = cache.getRegionFileIfLoaded(new ChunkPos(chunkX, chunkZ)); ++ if (regionFile != null) { ++ regionFile.fileLock.lock(); ++ } ++ } ++ ++ try { ++ return function.apply(regionFile); ++ } finally { ++ if (regionFile != null) { ++ regionFile.fileLock.unlock(); ++ } ++ } ++ } ++ } ++ ++ static final class ChunkDataTask implements Runnable { ++ ++ protected static final CompoundTag NOTHING_TO_WRITE = new CompoundTag(); ++ ++ private static final Logger LOGGER = LogUtils.getClassLogger(); ++ ++ RegionFileIOThread.InProgressRead inProgressRead; ++ volatile CompoundTag inProgressWrite = NOTHING_TO_WRITE; // only needs to be acquire/release ++ ++ boolean failedWrite; ++ ++ final ServerLevel world; ++ final int chunkX; ++ final int chunkZ; ++ final RegionFileIOThread.ChunkDataController taskController; ++ ++ final PrioritisedExecutor.PrioritisedTask prioritisedTask; ++ ++ /* ++ * IO thread will perform reads before writes for a given chunk x and z ++ * ++ * How reads/writes are scheduled: ++ * ++ * If read is scheduled while scheduling write, take no special action and just schedule write ++ * If read is scheduled while scheduling read and no write is scheduled, chain the read task ++ * ++ * ++ * If write is scheduled while scheduling read, use the pending write data and ret immediately (so no read is scheduled) ++ * If write is scheduled while scheduling write (ignore read in progress), overwrite the write in progress data ++ * ++ * This allows the reads and writes to act as if they occur synchronously to the thread scheduling them, however ++ * it fails to properly propagate write failures thanks to writes overwriting each other ++ */ ++ ++ public ChunkDataTask(final ServerLevel world, final int chunkX, final int chunkZ, final RegionFileIOThread.ChunkDataController taskController, ++ final PrioritisedExecutor executor, final PrioritisedExecutor.Priority priority) { ++ this.world = world; ++ this.chunkX = chunkX; ++ this.chunkZ = chunkZ; ++ this.taskController = taskController; ++ this.prioritisedTask = executor.createTask(this, priority); ++ } ++ ++ @Override ++ public String toString() { ++ return "Task for world: '" + this.world.getWorld().getName() + "' at (" + this.chunkX + "," + this.chunkZ + ++ ") type: " + this.taskController.type.name() + ", hash: " + this.hashCode(); ++ } ++ ++ @Override ++ public void run() { ++ final RegionFileIOThread.InProgressRead read = this.inProgressRead; ++ final ChunkCoordinate chunkKey = new ChunkCoordinate(CoordinateUtils.getChunkKey(this.chunkX, this.chunkZ)); ++ ++ if (read != null) { ++ final boolean[] canRead = new boolean[] { true }; ++ ++ if (read.waiters.isEmpty()) { ++ // cancelled read? go to task controller to confirm ++ final ChunkDataTask inMap = this.taskController.tasks.compute(chunkKey, (final ChunkCoordinate keyInMap, final ChunkDataTask valueInMap) -> { ++ if (valueInMap == null) { ++ throw new IllegalStateException("Write completed concurrently, expected this task: " + ChunkDataTask.this.toString() + ", report this!"); ++ } ++ if (valueInMap != ChunkDataTask.this) { ++ throw new IllegalStateException("Chunk task mismatch, expected this task: " + ChunkDataTask.this.toString() + ", got: " + valueInMap.toString() + ", report this!"); ++ } ++ ++ if (!read.waiters.isEmpty()) { // as per usual IntelliJ is unable to figure out that there are concurrent accesses. ++ return valueInMap; ++ } else { ++ canRead[0] = false; ++ } ++ ++ return valueInMap.inProgressWrite == NOTHING_TO_WRITE ? null : valueInMap; ++ }); ++ ++ if (inMap == null) { ++ // read is cancelled - and no write pending, so we're done ++ return; ++ } ++ // if there is a write in progress, we don't actually have to worry about waiters gaining new entries - ++ // the readers will just use the in progress write, so the value in canRead is good to use without ++ // further synchronisation. ++ } ++ ++ if (canRead[0]) { ++ CompoundTag compound = null; ++ Throwable throwable = null; ++ ++ try { ++ compound = this.taskController.readData(this.chunkX, this.chunkZ); ++ } catch (final ThreadDeath thr) { ++ throw thr; ++ } catch (final Throwable thr) { ++ throwable = thr; ++ LOGGER.error("Failed to read chunk data for task: " + this.toString(), thr); ++ } ++ read.complete(this, compound, throwable); ++ } ++ } ++ ++ CompoundTag write = this.inProgressWrite; ++ ++ if (write == NOTHING_TO_WRITE) { ++ final ChunkDataTask inMap = this.taskController.tasks.compute(chunkKey, (final ChunkCoordinate keyInMap, final ChunkDataTask valueInMap) -> { ++ if (valueInMap == null) { ++ throw new IllegalStateException("Write completed concurrently, expected this task: " + ChunkDataTask.this.toString() + ", report this!"); ++ } ++ if (valueInMap != ChunkDataTask.this) { ++ throw new IllegalStateException("Chunk task mismatch, expected this task: " + ChunkDataTask.this.toString() + ", got: " + valueInMap.toString() + ", report this!"); ++ } ++ return valueInMap.inProgressWrite == NOTHING_TO_WRITE ? null : valueInMap; ++ }); ++ ++ if (inMap == null) { ++ return; // set the task value to null, indicating we're done ++ } // else: inProgressWrite changed, so now we have something to write ++ } ++ ++ for (;;) { ++ write = this.inProgressWrite; ++ final CompoundTag dataWritten = write; ++ ++ boolean failedWrite = false; ++ ++ try { ++ this.taskController.writeData(this.chunkX, this.chunkZ, write); ++ } catch (final ThreadDeath thr) { ++ throw thr; ++ } catch (final Throwable thr) { ++ if (thr instanceof RegionFileStorage.RegionFileSizeException) { ++ final int maxSize = RegionFile.MAX_CHUNK_SIZE / (1024 * 1024); ++ LOGGER.error("Chunk at (" + this.chunkX + "," + this.chunkZ + ") in '" + this.world.getWorld().getName() + "' exceeds max size of " + maxSize + "MiB, it has been deleted from disk."); ++ } else { ++ failedWrite = thr instanceof IOException; ++ LOGGER.error("Failed to write chunk data for task: " + this.toString(), thr); ++ } ++ } ++ ++ final boolean finalFailWrite = failedWrite; ++ final boolean[] done = new boolean[] { false }; ++ ++ this.taskController.tasks.compute(chunkKey, (final ChunkCoordinate keyInMap, final ChunkDataTask valueInMap) -> { ++ if (valueInMap == null) { ++ throw new IllegalStateException("Write completed concurrently, expected this task: " + ChunkDataTask.this.toString() + ", report this!"); ++ } ++ if (valueInMap != ChunkDataTask.this) { ++ throw new IllegalStateException("Chunk task mismatch, expected this task: " + ChunkDataTask.this.toString() + ", got: " + valueInMap.toString() + ", report this!"); ++ } ++ if (valueInMap.inProgressWrite == dataWritten) { ++ valueInMap.failedWrite = finalFailWrite; ++ done[0] = true; ++ // keep the data in map if we failed the write so we can try to prevent data loss ++ return finalFailWrite ? valueInMap : null; ++ } ++ // different data than expected, means we need to retry write ++ return valueInMap; ++ }); ++ ++ if (done[0]) { ++ return; ++ } ++ ++ // fetch & write new data ++ continue; ++ } ++ } ++ } ++} +diff --git a/src/main/java/io/papermc/paper/chunk/system/light/LightQueue.java b/src/main/java/io/papermc/paper/chunk/system/light/LightQueue.java +new file mode 100644 +index 0000000000000000000000000000000000000000..69e9944358951bd69ff5e8b3482da1a5e4476209 +--- /dev/null ++++ b/src/main/java/io/papermc/paper/chunk/system/light/LightQueue.java +@@ -0,0 +1,283 @@ ++package io.papermc.paper.chunk.system.light; ++ ++import ca.spottedleaf.concurrentutil.executor.standard.PrioritisedExecutor; ++import ca.spottedleaf.starlight.common.light.BlockStarLightEngine; ++import ca.spottedleaf.starlight.common.light.SkyStarLightEngine; ++import ca.spottedleaf.starlight.common.light.StarLightInterface; ++import io.papermc.paper.util.CoordinateUtils; ++import it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap; ++import it.unimi.dsi.fastutil.shorts.ShortCollection; ++import it.unimi.dsi.fastutil.shorts.ShortOpenHashSet; ++import net.minecraft.core.BlockPos; ++import net.minecraft.core.SectionPos; ++import net.minecraft.server.level.ServerLevel; ++import net.minecraft.world.level.ChunkPos; ++import net.minecraft.world.level.chunk.status.ChunkStatus; ++import java.util.ArrayList; ++import java.util.HashSet; ++import java.util.List; ++import java.util.Set; ++import java.util.concurrent.CompletableFuture; ++import java.util.function.BooleanSupplier; ++ ++public final class LightQueue { ++ ++ protected final Long2ObjectOpenHashMap<ChunkTasks> chunkTasks = new Long2ObjectOpenHashMap<>(); ++ protected final StarLightInterface manager; ++ protected final ServerLevel world; ++ ++ public LightQueue(final StarLightInterface manager) { ++ this.manager = manager; ++ this.world = ((ServerLevel)manager.getWorld()); ++ } ++ ++ public void lowerPriority(final int chunkX, final int chunkZ, final PrioritisedExecutor.Priority priority) { ++ final ChunkTasks task; ++ synchronized (this) { ++ task = this.chunkTasks.get(CoordinateUtils.getChunkKey(chunkX, chunkZ)); ++ } ++ if (task != null) { ++ task.lowerPriority(priority); ++ } ++ } ++ ++ public void setPriority(final int chunkX, final int chunkZ, final PrioritisedExecutor.Priority priority) { ++ final ChunkTasks task; ++ synchronized (this) { ++ task = this.chunkTasks.get(CoordinateUtils.getChunkKey(chunkX, chunkZ)); ++ } ++ if (task != null) { ++ task.setPriority(priority); ++ } ++ } ++ ++ public void raisePriority(final int chunkX, final int chunkZ, final PrioritisedExecutor.Priority priority) { ++ final ChunkTasks task; ++ synchronized (this) { ++ task = this.chunkTasks.get(CoordinateUtils.getChunkKey(chunkX, chunkZ)); ++ } ++ if (task != null) { ++ task.raisePriority(priority); ++ } ++ } ++ ++ public PrioritisedExecutor.Priority getPriority(final int chunkX, final int chunkZ) { ++ final ChunkTasks task; ++ synchronized (this) { ++ task = this.chunkTasks.get(CoordinateUtils.getChunkKey(chunkX, chunkZ)); ++ } ++ if (task != null) { ++ return task.getPriority(); ++ } ++ ++ return PrioritisedExecutor.Priority.COMPLETING; ++ } ++ ++ public boolean isEmpty() { ++ synchronized (this) { ++ return this.chunkTasks.isEmpty(); ++ } ++ } ++ ++ public ChunkTasks queueBlockChange(final BlockPos pos) { ++ final ChunkTasks tasks; ++ synchronized (this) { ++ tasks = this.chunkTasks.computeIfAbsent(CoordinateUtils.getChunkKey(pos), (final long keyInMap) -> { ++ return new ChunkTasks(keyInMap, LightQueue.this.manager, LightQueue.this); ++ }); ++ tasks.changedPositions.add(pos.immutable()); ++ } ++ ++ tasks.schedule(); ++ ++ return tasks; ++ } ++ ++ public ChunkTasks queueSectionChange(final SectionPos pos, final boolean newEmptyValue) { ++ final ChunkTasks tasks; ++ synchronized (this) { ++ tasks = this.chunkTasks.computeIfAbsent(CoordinateUtils.getChunkKey(pos), (final long keyInMap) -> { ++ return new ChunkTasks(keyInMap, LightQueue.this.manager, LightQueue.this); ++ }); ++ ++ if (tasks.changedSectionSet == null) { ++ tasks.changedSectionSet = new Boolean[this.manager.maxSection - this.manager.minSection + 1]; ++ } ++ tasks.changedSectionSet[pos.getY() - this.manager.minSection] = Boolean.valueOf(newEmptyValue); ++ } ++ ++ tasks.schedule(); ++ ++ return tasks; ++ } ++ ++ public ChunkTasks queueChunkLightTask(final ChunkPos pos, final BooleanSupplier lightTask, final PrioritisedExecutor.Priority priority) { ++ final ChunkTasks tasks; ++ synchronized (this) { ++ tasks = this.chunkTasks.computeIfAbsent(CoordinateUtils.getChunkKey(pos), (final long keyInMap) -> { ++ return new ChunkTasks(keyInMap, LightQueue.this.manager, LightQueue.this, priority); ++ }); ++ if (tasks.lightTasks == null) { ++ tasks.lightTasks = new ArrayList<>(); ++ } ++ tasks.lightTasks.add(lightTask); ++ } ++ ++ tasks.schedule(); ++ ++ return tasks; ++ } ++ ++ public ChunkTasks queueChunkSkylightEdgeCheck(final SectionPos pos, final ShortCollection sections) { ++ final ChunkTasks tasks; ++ synchronized (this) { ++ tasks = this.chunkTasks.computeIfAbsent(CoordinateUtils.getChunkKey(pos), (final long keyInMap) -> { ++ return new ChunkTasks(keyInMap, LightQueue.this.manager, LightQueue.this); ++ }); ++ ++ ShortOpenHashSet queuedEdges = tasks.queuedEdgeChecksSky; ++ if (queuedEdges == null) { ++ queuedEdges = tasks.queuedEdgeChecksSky = new ShortOpenHashSet(); ++ } ++ queuedEdges.addAll(sections); ++ } ++ ++ tasks.schedule(); ++ ++ return tasks; ++ } ++ ++ public ChunkTasks queueChunkBlocklightEdgeCheck(final SectionPos pos, final ShortCollection sections) { ++ final ChunkTasks tasks; ++ ++ synchronized (this) { ++ tasks = this.chunkTasks.computeIfAbsent(CoordinateUtils.getChunkKey(pos), (final long keyInMap) -> { ++ return new ChunkTasks(keyInMap, LightQueue.this.manager, LightQueue.this); ++ }); ++ ++ ShortOpenHashSet queuedEdges = tasks.queuedEdgeChecksBlock; ++ if (queuedEdges == null) { ++ queuedEdges = tasks.queuedEdgeChecksBlock = new ShortOpenHashSet(); ++ } ++ queuedEdges.addAll(sections); ++ } ++ ++ tasks.schedule(); ++ ++ return tasks; ++ } ++ ++ public void removeChunk(final ChunkPos pos) { ++ final ChunkTasks tasks; ++ synchronized (this) { ++ tasks = this.chunkTasks.remove(CoordinateUtils.getChunkKey(pos)); ++ } ++ if (tasks != null && tasks.cancel()) { ++ tasks.onComplete.complete(null); ++ } ++ } ++ ++ public static final class ChunkTasks implements Runnable { ++ ++ public final CompletableFuture<Void> onComplete = new CompletableFuture<>(); ++ public boolean isTicketAdded; ++ public final long chunkCoordinate; ++ ++ private final StarLightInterface lightEngine; ++ private final LightQueue queue; ++ private final PrioritisedExecutor.PrioritisedTask task; ++ private final Set<BlockPos> changedPositions = new HashSet<>(); ++ private Boolean[] changedSectionSet; ++ private ShortOpenHashSet queuedEdgeChecksSky; ++ private ShortOpenHashSet queuedEdgeChecksBlock; ++ private List<BooleanSupplier> lightTasks; ++ ++ public ChunkTasks(final long chunkCoordinate, final StarLightInterface lightEngine, final LightQueue queue) { ++ this(chunkCoordinate, lightEngine, queue, PrioritisedExecutor.Priority.NORMAL); ++ } ++ ++ public ChunkTasks(final long chunkCoordinate, final StarLightInterface lightEngine, final LightQueue queue, ++ final PrioritisedExecutor.Priority priority) { ++ this.chunkCoordinate = chunkCoordinate; ++ this.lightEngine = lightEngine; ++ this.queue = queue; ++ this.task = queue.world.chunkTaskScheduler.radiusAwareScheduler.createTask( ++ CoordinateUtils.getChunkX(chunkCoordinate), CoordinateUtils.getChunkZ(chunkCoordinate), ++ ChunkStatus.LIGHT.writeRadius, this, priority ++ ); ++ } ++ ++ public void schedule() { ++ this.task.queue(); ++ } ++ ++ public boolean cancel() { ++ return this.task.cancel(); ++ } ++ ++ public PrioritisedExecutor.Priority getPriority() { ++ return this.task.getPriority(); ++ } ++ ++ public void lowerPriority(final PrioritisedExecutor.Priority priority) { ++ this.task.lowerPriority(priority); ++ } ++ ++ public void setPriority(final PrioritisedExecutor.Priority priority) { ++ this.task.setPriority(priority); ++ } ++ ++ public void raisePriority(final PrioritisedExecutor.Priority priority) { ++ this.task.raisePriority(priority); ++ } ++ ++ @Override ++ public void run() { ++ synchronized (this.queue) { ++ this.queue.chunkTasks.remove(this.chunkCoordinate); ++ } ++ ++ boolean litChunk = false; ++ if (this.lightTasks != null) { ++ for (final BooleanSupplier run : this.lightTasks) { ++ if (run.getAsBoolean()) { ++ litChunk = true; ++ break; ++ } ++ } ++ } ++ ++ final SkyStarLightEngine skyEngine = this.lightEngine.getSkyLightEngine(); ++ final BlockStarLightEngine blockEngine = this.lightEngine.getBlockLightEngine(); ++ try { ++ final long coordinate = this.chunkCoordinate; ++ final int chunkX = CoordinateUtils.getChunkX(coordinate); ++ final int chunkZ = CoordinateUtils.getChunkZ(coordinate); ++ ++ final Set<BlockPos> positions = this.changedPositions; ++ final Boolean[] sectionChanges = this.changedSectionSet; ++ ++ if (!litChunk) { ++ if (skyEngine != null && (!positions.isEmpty() || sectionChanges != null)) { ++ skyEngine.blocksChangedInChunk(this.lightEngine.getLightAccess(), chunkX, chunkZ, positions, sectionChanges); ++ } ++ if (blockEngine != null && (!positions.isEmpty() || sectionChanges != null)) { ++ blockEngine.blocksChangedInChunk(this.lightEngine.getLightAccess(), chunkX, chunkZ, positions, sectionChanges); ++ } ++ ++ if (skyEngine != null && this.queuedEdgeChecksSky != null) { ++ skyEngine.checkChunkEdges(this.lightEngine.getLightAccess(), chunkX, chunkZ, this.queuedEdgeChecksSky); ++ } ++ if (blockEngine != null && this.queuedEdgeChecksBlock != null) { ++ blockEngine.checkChunkEdges(this.lightEngine.getLightAccess(), chunkX, chunkZ, this.queuedEdgeChecksBlock); ++ } ++ } ++ ++ this.onComplete.complete(null); ++ } finally { ++ this.lightEngine.releaseSkyLightEngine(skyEngine); ++ this.lightEngine.releaseBlockLightEngine(blockEngine); ++ } ++ } ++ } ++} +diff --git a/src/main/java/io/papermc/paper/chunk/system/poi/PoiChunk.java b/src/main/java/io/papermc/paper/chunk/system/poi/PoiChunk.java +new file mode 100644 +index 0000000000000000000000000000000000000000..d72041aa814ff179e6e29a45dcd359a91d426d47 +--- /dev/null ++++ b/src/main/java/io/papermc/paper/chunk/system/poi/PoiChunk.java +@@ -0,0 +1,213 @@ ++package io.papermc.paper.chunk.system.poi; ++ ++import com.mojang.logging.LogUtils; ++import com.mojang.serialization.Codec; ++import com.mojang.serialization.DataResult; ++import io.papermc.paper.util.CoordinateUtils; ++import io.papermc.paper.util.TickThread; ++import io.papermc.paper.util.WorldUtil; ++import net.minecraft.SharedConstants; ++import net.minecraft.nbt.CompoundTag; ++import net.minecraft.nbt.NbtOps; ++import net.minecraft.nbt.Tag; ++import net.minecraft.resources.RegistryOps; ++import net.minecraft.server.level.ServerLevel; ++import net.minecraft.world.entity.ai.village.poi.PoiManager; ++import net.minecraft.world.entity.ai.village.poi.PoiSection; ++import org.slf4j.Logger; ++ ++import java.util.Optional; ++ ++public final class PoiChunk { ++ ++ private static final Logger LOGGER = LogUtils.getClassLogger(); ++ ++ public final ServerLevel world; ++ public final int chunkX; ++ public final int chunkZ; ++ public final int minSection; ++ public final int maxSection; ++ ++ protected final PoiSection[] sections; ++ ++ private boolean isDirty; ++ private boolean loaded; ++ ++ public PoiChunk(final ServerLevel world, final int chunkX, final int chunkZ, final int minSection, final int maxSection) { ++ this(world, chunkX, chunkZ, minSection, maxSection, new PoiSection[maxSection - minSection + 1]); ++ } ++ ++ public PoiChunk(final ServerLevel world, final int chunkX, final int chunkZ, final int minSection, final int maxSection, final PoiSection[] sections) { ++ this.world = world; ++ this.chunkX = chunkX; ++ this.chunkZ = chunkZ; ++ this.minSection = minSection; ++ this.maxSection = maxSection; ++ this.sections = sections; ++ if (this.sections.length != (maxSection - minSection + 1)) { ++ throw new IllegalStateException("Incorrect length used, expected " + (maxSection - minSection + 1) + ", got " + this.sections.length); ++ } ++ } ++ ++ public void load() { ++ TickThread.ensureTickThread(this.world, this.chunkX, this.chunkZ, "Loading in poi chunk off-main"); ++ if (this.loaded) { ++ return; ++ } ++ this.loaded = true; ++ this.world.chunkSource.getPoiManager().loadInPoiChunk(this); ++ } ++ ++ public boolean isLoaded() { ++ return this.loaded; ++ } ++ ++ public boolean isEmpty() { ++ for (final PoiSection section : this.sections) { ++ if (section != null && !section.isEmpty()) { ++ return false; ++ } ++ } ++ ++ return true; ++ } ++ ++ public PoiSection getOrCreateSection(final int chunkY) { ++ if (chunkY >= this.minSection && chunkY <= this.maxSection) { ++ final int idx = chunkY - this.minSection; ++ final PoiSection ret = this.sections[idx]; ++ if (ret != null) { ++ return ret; ++ } ++ ++ final PoiManager poiManager = this.world.getPoiManager(); ++ final long key = CoordinateUtils.getChunkSectionKey(this.chunkX, chunkY, this.chunkZ); ++ ++ return this.sections[idx] = new PoiSection(() -> { ++ poiManager.setDirty(key); ++ }); ++ } ++ throw new IllegalArgumentException("chunkY is out of bounds, chunkY: " + chunkY + " outside [" + this.minSection + "," + this.maxSection + "]"); ++ } ++ ++ public PoiSection getSection(final int chunkY) { ++ if (chunkY >= this.minSection && chunkY <= this.maxSection) { ++ return this.sections[chunkY - this.minSection]; ++ } ++ return null; ++ } ++ ++ public Optional<PoiSection> getSectionForVanilla(final int chunkY) { ++ if (chunkY >= this.minSection && chunkY <= this.maxSection) { ++ final PoiSection ret = this.sections[chunkY - this.minSection]; ++ return ret == null ? Optional.empty() : ret.noAllocateOptional; ++ } ++ return Optional.empty(); ++ } ++ ++ public boolean isDirty() { ++ return this.isDirty; ++ } ++ ++ public void setDirty(final boolean dirty) { ++ this.isDirty = dirty; ++ } ++ ++ // returns null if empty ++ public CompoundTag save() { ++ final RegistryOps<Tag> registryOps = RegistryOps.create(NbtOps.INSTANCE, world.getPoiManager().registryAccess); ++ ++ final CompoundTag ret = new CompoundTag(); ++ final CompoundTag sections = new CompoundTag(); ++ ret.put("Sections", sections); ++ ++ ret.putInt("DataVersion", SharedConstants.getCurrentVersion().getDataVersion().getVersion()); ++ ++ final ServerLevel world = this.world; ++ final PoiManager poiManager = world.getPoiManager(); ++ final int chunkX = this.chunkX; ++ final int chunkZ = this.chunkZ; ++ ++ for (int sectionY = this.minSection; sectionY <= this.maxSection; ++sectionY) { ++ final PoiSection chunk = this.sections[sectionY - this.minSection]; ++ if (chunk == null || chunk.isEmpty()) { ++ continue; ++ } ++ ++ final long key = CoordinateUtils.getChunkSectionKey(chunkX, sectionY, chunkZ); ++ // codecs are honestly such a fucking disaster. What the fuck is this trash? ++ final Codec<PoiSection> codec = PoiSection.codec(() -> { ++ poiManager.setDirty(key); ++ }); ++ ++ final DataResult<Tag> serializedResult = codec.encodeStart(registryOps, chunk); ++ final int finalSectionY = sectionY; ++ final Tag serialized = serializedResult.resultOrPartial((final String description) -> { ++ LOGGER.error("Failed to serialize poi chunk for world: " + world.getWorld().getName() + ", chunk: (" + chunkX + "," + finalSectionY + "," + chunkZ + "); description: " + description); ++ }).orElse(null); ++ if (serialized == null) { ++ // failed, should be logged from the resultOrPartial ++ continue; ++ } ++ ++ sections.put(Integer.toString(sectionY), serialized); ++ } ++ ++ return sections.isEmpty() ? null : ret; ++ } ++ ++ public static PoiChunk empty(final ServerLevel world, final int chunkX, final int chunkZ) { ++ final PoiChunk ret = new PoiChunk(world, chunkX, chunkZ, WorldUtil.getMinSection(world), WorldUtil.getMaxSection(world)); ++ ret.loaded = true; ++ return ret; ++ } ++ ++ public static PoiChunk parse(final ServerLevel world, final int chunkX, final int chunkZ, final CompoundTag data) { ++ final PoiChunk ret = empty(world, chunkX, chunkZ); ++ ++ final RegistryOps<Tag> registryOps = RegistryOps.create(NbtOps.INSTANCE, world.getPoiManager().registryAccess); ++ ++ final CompoundTag sections = data.getCompound("Sections"); ++ ++ if (sections.isEmpty()) { ++ // nothing to parse ++ return ret; ++ } ++ ++ final PoiManager poiManager = world.getPoiManager(); ++ ++ boolean readAnything = false; ++ ++ for (int sectionY = ret.minSection; sectionY <= ret.maxSection; ++sectionY) { ++ final String key = Integer.toString(sectionY); ++ if (!sections.contains(key)) { ++ continue; ++ } ++ ++ final long coordinateKey = CoordinateUtils.getChunkSectionKey(chunkX, sectionY, chunkZ); ++ // codecs are honestly such a fucking disaster. What the fuck is this trash? ++ final Codec<PoiSection> codec = PoiSection.codec(() -> { ++ poiManager.setDirty(coordinateKey); ++ }); ++ ++ final CompoundTag section = sections.getCompound(key); ++ final DataResult<PoiSection> deserializeResult = codec.parse(registryOps, section); ++ final int finalSectionY = sectionY; ++ final PoiSection deserialized = deserializeResult.resultOrPartial((final String description) -> { ++ LOGGER.error("Failed to deserialize poi chunk for world: " + world.getWorld().getName() + ", chunk: (" + chunkX + "," + finalSectionY + "," + chunkZ + "); description: " + description); ++ }).orElse(null); ++ ++ if (deserialized == null || deserialized.isEmpty()) { ++ // completely empty, no point in storing this ++ continue; ++ } ++ ++ readAnything = true; ++ ret.sections[sectionY - ret.minSection] = deserialized; ++ } ++ ++ ret.loaded = !readAnything; // Set loaded to false if we read anything to ensure proper callbacks to PoiManager are made on #load ++ ++ return ret; ++ } ++} +diff --git a/src/main/java/io/papermc/paper/chunk/system/scheduling/ChunkFullTask.java b/src/main/java/io/papermc/paper/chunk/system/scheduling/ChunkFullTask.java +new file mode 100644 +index 0000000000000000000000000000000000000000..c307b084f59f7bb94dc02f25bbcd3e01e01d2306 +--- /dev/null ++++ b/src/main/java/io/papermc/paper/chunk/system/scheduling/ChunkFullTask.java +@@ -0,0 +1,131 @@ ++package io.papermc.paper.chunk.system.scheduling; ++ ++import ca.spottedleaf.concurrentutil.executor.standard.PrioritisedExecutor; ++import ca.spottedleaf.concurrentutil.util.ConcurrentUtil; ++import com.mojang.logging.LogUtils; ++import io.papermc.paper.chunk.system.poi.PoiChunk; ++import net.minecraft.server.level.ChunkMap; ++import net.minecraft.server.level.ServerLevel; ++import net.minecraft.world.level.chunk.ChunkAccess; ++import net.minecraft.world.level.chunk.status.ChunkStatus; ++import net.minecraft.world.level.chunk.ImposterProtoChunk; ++import net.minecraft.world.level.chunk.LevelChunk; ++import net.minecraft.world.level.chunk.ProtoChunk; ++import org.slf4j.Logger; ++import java.lang.invoke.VarHandle; ++ ++public final class ChunkFullTask extends ChunkProgressionTask implements Runnable { ++ ++ private static final Logger LOGGER = LogUtils.getClassLogger(); ++ ++ protected final NewChunkHolder chunkHolder; ++ protected final ChunkAccess fromChunk; ++ protected final PrioritisedExecutor.PrioritisedTask convertToFullTask; ++ ++ public ChunkFullTask(final ChunkTaskScheduler scheduler, final ServerLevel world, final int chunkX, final int chunkZ, ++ final NewChunkHolder chunkHolder, final ChunkAccess fromChunk, final PrioritisedExecutor.Priority priority) { ++ super(scheduler, world, chunkX, chunkZ); ++ this.chunkHolder = chunkHolder; ++ this.fromChunk = fromChunk; ++ this.convertToFullTask = scheduler.createChunkTask(chunkX, chunkZ, this, priority); ++ } ++ ++ @Override ++ public ChunkStatus getTargetStatus() { ++ return ChunkStatus.FULL; ++ } ++ ++ @Override ++ public void run() { ++ // See Vanilla protoChunkToFullChunk for what this function should be doing ++ final LevelChunk chunk; ++ try { ++ // moved from the load from nbt stage into here ++ final PoiChunk poiChunk = this.chunkHolder.getPoiChunk(); ++ if (poiChunk == null) { ++ LOGGER.error("Expected poi chunk to be loaded with chunk for task " + this.toString()); ++ } else { ++ poiChunk.load(); ++ this.world.getPoiManager().checkConsistency(this.fromChunk); ++ } ++ ++ if (this.fromChunk instanceof ImposterProtoChunk wrappedFull) { ++ chunk = wrappedFull.getWrapped(); ++ } else { ++ final ServerLevel world = this.world; ++ final ProtoChunk protoChunk = (ProtoChunk)this.fromChunk; ++ chunk = new LevelChunk(this.world, protoChunk, (final LevelChunk unused) -> { ++ ChunkMap.postLoadProtoChunk(world, protoChunk.getEntities(), protoChunk.getPos()); // Paper - rewrite chunk system ++ }); ++ } ++ ++ chunk.setChunkHolder(this.scheduler.chunkHolderManager.getChunkHolder(this.chunkX, this.chunkZ)); // replaces setFullStatus ++ chunk.runPostLoad(); ++ // Unlike Vanilla, we load the entity chunk here, as we load the NBT in empty status (unlike Vanilla) ++ // This brings entity addition back in line with older versions of the game ++ // Since we load the NBT in the empty status, this will never block for I/O ++ this.world.chunkTaskScheduler.chunkHolderManager.getOrCreateEntityChunk(this.chunkX, this.chunkZ, false); ++ ++ // we don't need the entitiesInLevel trash, this system doesn't double run callbacks ++ chunk.setLoaded(true); ++ chunk.registerAllBlockEntitiesAfterLevelLoad(); ++ chunk.registerTickContainerInLevel(this.world); ++ } catch (final Throwable throwable) { ++ this.complete(null, throwable); ++ return; ++ } ++ this.complete(chunk, null); ++ } ++ ++ protected volatile boolean scheduled; ++ protected static final VarHandle SCHEDULED_HANDLE = ConcurrentUtil.getVarHandle(ChunkFullTask.class, "scheduled", boolean.class); ++ ++ @Override ++ public boolean isScheduled() { ++ return this.scheduled; ++ } ++ ++ @Override ++ public void schedule() { ++ if ((boolean)SCHEDULED_HANDLE.getAndSet((ChunkFullTask)this, true)) { ++ throw new IllegalStateException("Cannot double call schedule()"); ++ } ++ this.convertToFullTask.queue(); ++ } ++ ++ @Override ++ public void cancel() { ++ if (this.convertToFullTask.cancel()) { ++ this.complete(null, null); ++ } ++ } ++ ++ @Override ++ public PrioritisedExecutor.Priority getPriority() { ++ return this.convertToFullTask.getPriority(); ++ } ++ ++ @Override ++ public void lowerPriority(final PrioritisedExecutor.Priority priority) { ++ if (!PrioritisedExecutor.Priority.isValidPriority(priority)) { ++ throw new IllegalArgumentException("Invalid priority " + priority); ++ } ++ this.convertToFullTask.lowerPriority(priority); ++ } ++ ++ @Override ++ public void setPriority(final PrioritisedExecutor.Priority priority) { ++ if (!PrioritisedExecutor.Priority.isValidPriority(priority)) { ++ throw new IllegalArgumentException("Invalid priority " + priority); ++ } ++ this.convertToFullTask.setPriority(priority); ++ } ++ ++ @Override ++ public void raisePriority(final PrioritisedExecutor.Priority priority) { ++ if (!PrioritisedExecutor.Priority.isValidPriority(priority)) { ++ throw new IllegalArgumentException("Invalid priority " + priority); ++ } ++ this.convertToFullTask.raisePriority(priority); ++ } ++} +diff --git a/src/main/java/io/papermc/paper/chunk/system/scheduling/ChunkHolderManager.java b/src/main/java/io/papermc/paper/chunk/system/scheduling/ChunkHolderManager.java +new file mode 100644 +index 0000000000000000000000000000000000000000..5b446e6ac151f99f64f0c442d0b40b5e251bc4c4 +--- /dev/null ++++ b/src/main/java/io/papermc/paper/chunk/system/scheduling/ChunkHolderManager.java +@@ -0,0 +1,1500 @@ ++package io.papermc.paper.chunk.system.scheduling; ++import ca.spottedleaf.concurrentutil.executor.standard.PrioritisedExecutor; ++import ca.spottedleaf.concurrentutil.lock.ReentrantAreaLock; ++import ca.spottedleaf.concurrentutil.map.SWMRLong2ObjectHashTable; ++import com.google.common.collect.ImmutableList; ++import com.google.gson.JsonArray; ++import com.google.gson.JsonObject; ++import com.mojang.logging.LogUtils; ++import io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader; ++import io.papermc.paper.chunk.system.io.RegionFileIOThread; ++import io.papermc.paper.chunk.system.poi.PoiChunk; ++import io.papermc.paper.threadedregions.TickRegions; ++import io.papermc.paper.util.CoordinateUtils; ++import io.papermc.paper.util.TickThread; ++import io.papermc.paper.world.ChunkEntitySlices; ++import it.unimi.dsi.fastutil.longs.Long2ByteLinkedOpenHashMap; ++import it.unimi.dsi.fastutil.longs.Long2ByteMap; ++import it.unimi.dsi.fastutil.longs.Long2IntLinkedOpenHashMap; ++import it.unimi.dsi.fastutil.longs.Long2IntMap; ++import it.unimi.dsi.fastutil.longs.Long2IntOpenHashMap; ++import it.unimi.dsi.fastutil.longs.Long2ObjectMap; ++import it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap; ++import it.unimi.dsi.fastutil.longs.LongArrayList; ++import it.unimi.dsi.fastutil.longs.LongIterator; ++import it.unimi.dsi.fastutil.objects.ObjectRBTreeSet; ++import net.minecraft.nbt.CompoundTag; ++import io.papermc.paper.chunk.system.ChunkSystem; ++import net.minecraft.server.MinecraftServer; ++import net.minecraft.server.level.ChunkHolder; ++import net.minecraft.server.level.ChunkLevel; ++import net.minecraft.server.level.FullChunkStatus; ++import net.minecraft.server.level.ServerLevel; ++import net.minecraft.server.level.Ticket; ++import net.minecraft.server.level.TicketType; ++import net.minecraft.util.SortedArraySet; ++import net.minecraft.util.Unit; ++import net.minecraft.world.level.ChunkPos; ++import org.bukkit.plugin.Plugin; ++import org.slf4j.Logger; ++import java.io.IOException; ++import java.text.DecimalFormat; ++import java.util.ArrayDeque; ++import java.util.ArrayList; ++import java.util.Collection; ++import java.util.Collections; ++import java.util.Iterator; ++import java.util.List; ++import java.util.concurrent.ConcurrentHashMap; ++import java.util.concurrent.TimeUnit; ++import java.util.concurrent.atomic.AtomicBoolean; ++import java.util.concurrent.atomic.AtomicLong; ++import java.util.concurrent.atomic.AtomicReference; ++import java.util.concurrent.locks.LockSupport; ++import java.util.function.Predicate; ++ ++public final class ChunkHolderManager { ++ ++ private static final Logger LOGGER = LogUtils.getClassLogger(); ++ ++ public static final int FULL_LOADED_TICKET_LEVEL = 33; ++ public static final int BLOCK_TICKING_TICKET_LEVEL = 32; ++ public static final int ENTITY_TICKING_TICKET_LEVEL = 31; ++ public static final int MAX_TICKET_LEVEL = ChunkLevel.MAX_LEVEL; // inclusive ++ ++ private static final long NO_TIMEOUT_MARKER = Long.MIN_VALUE; ++ private static final long PROBE_MARKER = Long.MIN_VALUE + 1; ++ public final ReentrantAreaLock ticketLockArea; ++ ++ private final ConcurrentHashMap<RegionFileIOThread.ChunkCoordinate, SortedArraySet<Ticket<?>>> tickets = new java.util.concurrent.ConcurrentHashMap<>(); ++ private final ConcurrentHashMap<RegionFileIOThread.ChunkCoordinate, Long2IntOpenHashMap> sectionToChunkToExpireCount = new java.util.concurrent.ConcurrentHashMap<>(); ++ final ChunkQueue unloadQueue; ++ ++ public boolean processTicketUpdates(final int posX, final int posZ) { ++ final int ticketShift = ThreadedTicketLevelPropagator.SECTION_SHIFT; ++ final int ticketMask = (1 << ticketShift) - 1; ++ final List<ChunkProgressionTask> scheduledTasks = new ArrayList<>(); ++ final List<NewChunkHolder> changedFullStatus = new ArrayList<>(); ++ final boolean ret; ++ final ReentrantAreaLock.Node ticketLock = this.ticketLockArea.lock( ++ ((posX >> ticketShift) - 1) << ticketShift, ++ ((posZ >> ticketShift) - 1) << ticketShift, ++ (((posX >> ticketShift) + 1) << ticketShift) | ticketMask, ++ (((posZ >> ticketShift) + 1) << ticketShift) | ticketMask ++ ); ++ try { ++ ret = this.processTicketUpdatesNoLock(posX >> ticketShift, posZ >> ticketShift, scheduledTasks, changedFullStatus); ++ } finally { ++ this.ticketLockArea.unlock(ticketLock); ++ } ++ ++ this.addChangedStatuses(changedFullStatus); ++ ++ for (int i = 0, len = scheduledTasks.size(); i < len; ++i) { ++ scheduledTasks.get(i).schedule(); ++ } ++ ++ return ret; ++ } ++ ++ private boolean processTicketUpdatesNoLock(final int sectionX, final int sectionZ, final List<ChunkProgressionTask> scheduledTasks, ++ final List<NewChunkHolder> changedFullStatus) { ++ return this.ticketLevelPropagator.performUpdate( ++ sectionX, sectionZ, this.taskScheduler.schedulingLockArea, scheduledTasks, changedFullStatus ++ ); ++ } ++ ++ private final SWMRLong2ObjectHashTable<NewChunkHolder> chunkHolders = new SWMRLong2ObjectHashTable<>(16384, 0.25f); ++ // what a disaster of a name ++ // this is a map of removal tick to a map of chunks and the number of tickets a chunk has that are to expire that tick ++ private final Long2ObjectOpenHashMap<Long2IntOpenHashMap> removeTickToChunkExpireTicketCount = new Long2ObjectOpenHashMap<>(); ++ private final ServerLevel world; ++ private final ChunkTaskScheduler taskScheduler; ++ private long currentTick; ++ ++ private final ArrayDeque<NewChunkHolder> pendingFullLoadUpdate = new ArrayDeque<>(); ++ private final ObjectRBTreeSet<NewChunkHolder> autoSaveQueue = new ObjectRBTreeSet<>((final NewChunkHolder c1, final NewChunkHolder c2) -> { ++ if (c1 == c2) { ++ return 0; ++ } ++ ++ final int saveTickCompare = Long.compare(c1.lastAutoSave, c2.lastAutoSave); ++ ++ if (saveTickCompare != 0) { ++ return saveTickCompare; ++ } ++ ++ final long coord1 = CoordinateUtils.getChunkKey(c1.chunkX, c1.chunkZ); ++ final long coord2 = CoordinateUtils.getChunkKey(c2.chunkX, c2.chunkZ); ++ ++ if (coord1 == coord2) { ++ throw new IllegalStateException("Duplicate chunkholder in auto save queue"); ++ } ++ ++ return Long.compare(coord1, coord2); ++ }); ++ ++ public ChunkHolderManager(final ServerLevel world, final ChunkTaskScheduler taskScheduler) { ++ this.world = world; ++ this.taskScheduler = taskScheduler; ++ this.ticketLockArea = new ReentrantAreaLock(taskScheduler.getChunkSystemLockShift()); ++ this.unloadQueue = new ChunkQueue(world.getRegionChunkShift()); ++ } ++ ++ private final AtomicLong statusUpgradeId = new AtomicLong(); ++ ++ long getNextStatusUpgradeId() { ++ return this.statusUpgradeId.incrementAndGet(); ++ } ++ ++ public List<ChunkHolder> getOldChunkHolders() { ++ final List<NewChunkHolder> holders = this.getChunkHolders(); ++ final List<ChunkHolder> ret = new ArrayList<>(holders.size()); ++ for (final NewChunkHolder holder : holders) { ++ ret.add(holder.vanillaChunkHolder); ++ } ++ return ret; ++ } ++ ++ public List<NewChunkHolder> getChunkHolders() { ++ final List<NewChunkHolder> ret = new ArrayList<>(this.chunkHolders.size()); ++ this.chunkHolders.forEachValue(ret::add); ++ return ret; ++ } ++ ++ public int size() { ++ return this.chunkHolders.size(); ++ } ++ ++ public void close(final boolean save, final boolean halt) { ++ TickThread.ensureTickThread("Closing world off-main"); ++ if (halt) { ++ LOGGER.info("Waiting 60s for chunk system to halt for world '" + this.world.getWorld().getName() + "'"); ++ if (!this.taskScheduler.halt(true, TimeUnit.SECONDS.toNanos(60L))) { ++ LOGGER.warn("Failed to halt world generation/loading tasks for world '" + this.world.getWorld().getName() + "'"); ++ } else { ++ LOGGER.info("Halted chunk system for world '" + this.world.getWorld().getName() + "'"); ++ } ++ } ++ ++ if (save) { ++ this.saveAllChunks(true, true, true); ++ } ++ ++ if (this.world.chunkDataControllerNew.hasTasks() || this.world.entityDataControllerNew.hasTasks() || this.world.poiDataControllerNew.hasTasks()) { ++ RegionFileIOThread.flush(); ++ } ++ ++ // kill regionfile cache ++ try { ++ this.world.chunkDataControllerNew.getCache().close(); ++ } catch (final IOException ex) { ++ LOGGER.error("Failed to close chunk regionfile cache for world '" + this.world.getWorld().getName() + "'", ex); ++ } ++ try { ++ this.world.entityDataControllerNew.getCache().close(); ++ } catch (final IOException ex) { ++ LOGGER.error("Failed to close entity regionfile cache for world '" + this.world.getWorld().getName() + "'", ex); ++ } ++ try { ++ this.world.poiDataControllerNew.getCache().close(); ++ } catch (final IOException ex) { ++ LOGGER.error("Failed to close poi regionfile cache for world '" + this.world.getWorld().getName() + "'", ex); ++ } ++ } ++ ++ void ensureInAutosave(final NewChunkHolder holder) { ++ if (!this.autoSaveQueue.contains(holder)) { ++ holder.lastAutoSave = MinecraftServer.currentTick; ++ this.autoSaveQueue.add(holder); ++ } ++ } ++ ++ public void autoSave() { ++ final List<NewChunkHolder> reschedule = new ArrayList<>(); ++ final long currentTick = MinecraftServer.currentTickLong; ++ final long maxSaveTime = currentTick - this.world.paperConfig().chunks.autoSaveInterval.value(); ++ for (int autoSaved = 0; autoSaved < this.world.paperConfig().chunks.maxAutoSaveChunksPerTick && !this.autoSaveQueue.isEmpty();) { ++ final NewChunkHolder holder = this.autoSaveQueue.first(); ++ ++ if (holder.lastAutoSave > maxSaveTime) { ++ break; ++ } ++ ++ this.autoSaveQueue.remove(holder); ++ ++ holder.lastAutoSave = currentTick; ++ if (holder.save(false, false) != null) { ++ ++autoSaved; ++ } ++ ++ if (holder.getChunkStatus().isOrAfter(FullChunkStatus.FULL)) { ++ reschedule.add(holder); ++ } ++ } ++ ++ for (final NewChunkHolder holder : reschedule) { ++ if (holder.getChunkStatus().isOrAfter(FullChunkStatus.FULL)) { ++ this.autoSaveQueue.add(holder); ++ } ++ } ++ } ++ ++ public void saveAllChunks(final boolean flush, final boolean shutdown, final boolean logProgress) { ++ final List<NewChunkHolder> holders = this.getChunkHolders(); ++ ++ if (logProgress) { ++ LOGGER.info("Saving all chunkholders for world '" + this.world.getWorld().getName() + "'"); ++ } ++ ++ final DecimalFormat format = new DecimalFormat("#0.00"); ++ ++ int saved = 0; ++ ++ long start = System.nanoTime(); ++ long lastLog = start; ++ boolean needsFlush = false; ++ final int flushInterval = 50; ++ ++ int savedChunk = 0; ++ int savedEntity = 0; ++ int savedPoi = 0; ++ ++ for (int i = 0, len = holders.size(); i < len; ++i) { ++ final NewChunkHolder holder = holders.get(i); ++ try { ++ final NewChunkHolder.SaveStat saveStat = holder.save(shutdown, false); ++ if (saveStat != null) { ++ ++saved; ++ needsFlush = flush; ++ if (saveStat.savedChunk()) { ++ ++savedChunk; ++ } ++ if (saveStat.savedEntityChunk()) { ++ ++savedEntity; ++ } ++ if (saveStat.savedPoiChunk()) { ++ ++savedPoi; ++ } ++ } ++ } catch (final ThreadDeath thr) { ++ throw thr; ++ } catch (final Throwable thr) { ++ LOGGER.error("Failed to save chunk (" + holder.chunkX + "," + holder.chunkZ + ") in world '" + this.world.getWorld().getName() + "'", thr); ++ } ++ if (needsFlush && (saved % flushInterval) == 0) { ++ needsFlush = false; ++ RegionFileIOThread.partialFlush(flushInterval / 2); ++ } ++ if (logProgress) { ++ final long currTime = System.nanoTime(); ++ if ((currTime - lastLog) > TimeUnit.SECONDS.toNanos(10L)) { ++ lastLog = currTime; ++ LOGGER.info("Saved " + saved + " chunks (" + format.format((double)(i+1)/(double)len * 100.0) + "%) in world '" + this.world.getWorld().getName() + "'"); ++ } ++ } ++ } ++ if (flush) { ++ RegionFileIOThread.flush(); ++ if (this.world.paperConfig().chunks.flushRegionsOnSave) { ++ try { ++ this.world.chunkSource.chunkMap.regionFileCache.flush(); ++ } catch (IOException ex) { ++ LOGGER.error("Exception when flushing regions in world {}", this.world.getWorld().getName(), ex); ++ } ++ } ++ } ++ if (logProgress) { ++ LOGGER.info("Saved " + savedChunk + " block chunks, " + savedEntity + " entity chunks, " + savedPoi + " poi chunks in world '" + this.world.getWorld().getName() + "' in " + format.format(1.0E-9 * (System.nanoTime() - start)) + "s"); ++ } ++ } ++ ++ protected final ThreadedTicketLevelPropagator ticketLevelPropagator = new ThreadedTicketLevelPropagator() { ++ @Override ++ protected void processLevelUpdates(final Long2ByteLinkedOpenHashMap updates) { ++ // first the necessary chunkholders must be created, so just update the ticket levels ++ for (final Iterator<Long2ByteMap.Entry> iterator = updates.long2ByteEntrySet().fastIterator(); iterator.hasNext();) { ++ final Long2ByteMap.Entry entry = iterator.next(); ++ final long key = entry.getLongKey(); ++ final int newLevel = convertBetweenTicketLevels((int)entry.getByteValue()); ++ ++ NewChunkHolder current = ChunkHolderManager.this.chunkHolders.get(key); ++ if (current == null && newLevel > MAX_TICKET_LEVEL) { ++ // not loaded and it shouldn't be loaded! ++ iterator.remove(); ++ continue; ++ } ++ ++ final int currentLevel = current == null ? MAX_TICKET_LEVEL + 1 : current.getCurrentTicketLevel(); ++ if (currentLevel == newLevel) { ++ // nothing to do ++ iterator.remove(); ++ continue; ++ } ++ ++ if (current == null) { ++ // must create ++ current = ChunkHolderManager.this.createChunkHolder(key); ++ synchronized (ChunkHolderManager.this.chunkHolders) { ++ ChunkHolderManager.this.chunkHolders.put(key, current); ++ } ++ current.updateTicketLevel(newLevel); ++ } else { ++ current.updateTicketLevel(newLevel); ++ } ++ } ++ } ++ ++ @Override ++ protected void processSchedulingUpdates(final Long2ByteLinkedOpenHashMap updates, final List<ChunkProgressionTask> scheduledTasks, ++ final List<NewChunkHolder> changedFullStatus) { ++ final List<ChunkProgressionTask> prev = CURRENT_TICKET_UPDATE_SCHEDULING.get(); ++ CURRENT_TICKET_UPDATE_SCHEDULING.set(scheduledTasks); ++ try { ++ for (final LongIterator iterator = updates.keySet().iterator(); iterator.hasNext();) { ++ final long key = iterator.nextLong(); ++ final NewChunkHolder current = ChunkHolderManager.this.chunkHolders.get(key); ++ ++ if (current == null) { ++ throw new IllegalStateException("Expected chunk holder to be created"); ++ } ++ ++ current.processTicketLevelUpdate(scheduledTasks, changedFullStatus); ++ } ++ } finally { ++ CURRENT_TICKET_UPDATE_SCHEDULING.set(prev); ++ } ++ } ++ }; ++ // function for converting between ticket levels and propagator levels and vice versa ++ // the problem is the ticket level propagator will propagate from a set source down to zero, whereas mojang expects ++ // levels to propagate from a set value up to a maximum value. so we need to convert the levels we put into the propagator ++ // and the levels we get out of the propagator ++ ++ public static int convertBetweenTicketLevels(final int level) { ++ return ChunkLevel.MAX_LEVEL - level + 1; ++ } ++ ++ public String getTicketDebugString(final long coordinate) { ++ final ReentrantAreaLock.Node ticketLock = this.ticketLockArea.lock(CoordinateUtils.getChunkX(coordinate), CoordinateUtils.getChunkZ(coordinate)); ++ try { ++ final SortedArraySet<Ticket<?>> tickets = this.tickets.get(new RegionFileIOThread.ChunkCoordinate(coordinate)); ++ ++ return tickets != null ? tickets.first().toString() : "no_ticket"; ++ } finally { ++ if (ticketLock != null) { ++ this.ticketLockArea.unlock(ticketLock); ++ } ++ } ++ } ++ ++ public Long2ObjectOpenHashMap<SortedArraySet<Ticket<?>>> getTicketsCopy() { ++ final Long2ObjectOpenHashMap<SortedArraySet<Ticket<?>>> ret = new Long2ObjectOpenHashMap<>(); ++ final Long2ObjectOpenHashMap<List<RegionFileIOThread.ChunkCoordinate>> sections = new Long2ObjectOpenHashMap(); ++ final int sectionShift = this.taskScheduler.getChunkSystemLockShift(); ++ for (final RegionFileIOThread.ChunkCoordinate coord : this.tickets.keySet()) { ++ sections.computeIfAbsent( ++ CoordinateUtils.getChunkKey( ++ CoordinateUtils.getChunkX(coord.key) >> sectionShift, ++ CoordinateUtils.getChunkZ(coord.key) >> sectionShift ++ ), ++ (final long keyInMap) -> { ++ return new ArrayList<>(); ++ } ++ ).add(coord); ++ } ++ ++ for (final Iterator<Long2ObjectMap.Entry<List<RegionFileIOThread.ChunkCoordinate>>> iterator = sections.long2ObjectEntrySet().fastIterator(); ++ iterator.hasNext();) { ++ final Long2ObjectMap.Entry<List<RegionFileIOThread.ChunkCoordinate>> entry = iterator.next(); ++ final long sectionKey = entry.getLongKey(); ++ final List<RegionFileIOThread.ChunkCoordinate> coordinates = entry.getValue(); ++ ++ final ReentrantAreaLock.Node ticketLock = this.ticketLockArea.lock( ++ CoordinateUtils.getChunkX(sectionKey) << sectionShift, ++ CoordinateUtils.getChunkZ(sectionKey) << sectionShift ++ ); ++ try { ++ for (final RegionFileIOThread.ChunkCoordinate coord : coordinates) { ++ final SortedArraySet<Ticket<?>> tickets = this.tickets.get(coord); ++ if (tickets == null) { ++ // removed before we acquired lock ++ continue; ++ } ++ ret.put(coord.key, new SortedArraySet<>(tickets)); ++ } ++ } finally { ++ this.ticketLockArea.unlock(ticketLock); ++ } ++ } ++ ++ return ret; ++ } ++ ++ public Collection<Plugin> getPluginChunkTickets(int x, int z) { ++ ImmutableList.Builder<Plugin> ret; ++ final ReentrantAreaLock.Node ticketLock = this.ticketLockArea.lock(x, z); ++ try { ++ final long coordinate = CoordinateUtils.getChunkKey(x, z); ++ final SortedArraySet<Ticket<?>> tickets = this.tickets.get(new RegionFileIOThread.ChunkCoordinate(coordinate)); ++ ++ if (tickets == null) { ++ return Collections.emptyList(); ++ } ++ ++ ret = ImmutableList.builder(); ++ for (Ticket<?> ticket : tickets) { ++ if (ticket.getType() == TicketType.PLUGIN_TICKET) { ++ ret.add((Plugin)ticket.key); ++ } ++ } ++ } finally { ++ this.ticketLockArea.unlock(ticketLock); ++ } ++ ++ return ret.build(); ++ } ++ ++ protected final void updateTicketLevel(final long coordinate, final int ticketLevel) { ++ if (ticketLevel > ChunkLevel.MAX_LEVEL) { ++ this.ticketLevelPropagator.removeSource(CoordinateUtils.getChunkX(coordinate), CoordinateUtils.getChunkZ(coordinate)); ++ } else { ++ this.ticketLevelPropagator.setSource(CoordinateUtils.getChunkX(coordinate), CoordinateUtils.getChunkZ(coordinate), convertBetweenTicketLevels(ticketLevel)); ++ } ++ } ++ ++ private static int getTicketLevelAt(SortedArraySet<Ticket<?>> tickets) { ++ return !tickets.isEmpty() ? tickets.first().getTicketLevel() : MAX_TICKET_LEVEL + 1; ++ } ++ ++ public <T> boolean addTicketAtLevel(final TicketType<T> type, final ChunkPos chunkPos, final int level, ++ final T identifier) { ++ return this.addTicketAtLevel(type, CoordinateUtils.getChunkKey(chunkPos), level, identifier); ++ } ++ ++ public <T> boolean addTicketAtLevel(final TicketType<T> type, final int chunkX, final int chunkZ, final int level, ++ final T identifier) { ++ return this.addTicketAtLevel(type, CoordinateUtils.getChunkKey(chunkX, chunkZ), level, identifier); ++ } ++ ++ private void addExpireCount(final int chunkX, final int chunkZ) { ++ final long chunkKey = CoordinateUtils.getChunkKey(chunkX, chunkZ); ++ ++ final int sectionShift = this.world.getRegionChunkShift(); ++ final RegionFileIOThread.ChunkCoordinate sectionKey = new RegionFileIOThread.ChunkCoordinate(CoordinateUtils.getChunkKey( ++ chunkX >> sectionShift, ++ chunkZ >> sectionShift ++ )); ++ ++ this.sectionToChunkToExpireCount.computeIfAbsent(sectionKey, (final RegionFileIOThread.ChunkCoordinate keyInMap) -> { ++ return new Long2IntOpenHashMap(); ++ }).addTo(chunkKey, 1); ++ } ++ ++ private void removeExpireCount(final int chunkX, final int chunkZ) { ++ final long chunkKey = CoordinateUtils.getChunkKey(chunkX, chunkZ); ++ ++ final int sectionShift = this.world.getRegionChunkShift(); ++ final RegionFileIOThread.ChunkCoordinate sectionKey = new RegionFileIOThread.ChunkCoordinate(CoordinateUtils.getChunkKey( ++ chunkX >> sectionShift, ++ chunkZ >> sectionShift ++ )); ++ ++ final Long2IntOpenHashMap removeCounts = this.sectionToChunkToExpireCount.get(sectionKey); ++ final int prevCount = removeCounts.addTo(chunkKey, -1); ++ ++ if (prevCount == 1) { ++ removeCounts.remove(chunkKey); ++ if (removeCounts.isEmpty()) { ++ this.sectionToChunkToExpireCount.remove(sectionKey); ++ } ++ } ++ } ++ ++ // supposed to return true if the ticket was added and did not replace another ++ // but, we always return false if the ticket cannot be added ++ public <T> boolean addTicketAtLevel(final TicketType<T> type, final long chunk, final int level, final T identifier) { ++ return this.addTicketAtLevel(type, chunk, level, identifier, true); ++ } ++ ++ <T> boolean addTicketAtLevel(final TicketType<T> type, final long chunk, final int level, final T identifier, final boolean lock) { ++ final long removeDelay = type.timeout <= 0 ? NO_TIMEOUT_MARKER : type.timeout; ++ if (level > MAX_TICKET_LEVEL) { ++ return false; ++ } ++ ++ final int chunkX = CoordinateUtils.getChunkX(chunk); ++ final int chunkZ = CoordinateUtils.getChunkZ(chunk); ++ final RegionFileIOThread.ChunkCoordinate chunkCoord = new RegionFileIOThread.ChunkCoordinate(chunk); ++ final Ticket<T> ticket = new Ticket<>(type, level, identifier, removeDelay); ++ ++ final ReentrantAreaLock.Node ticketLock = lock ? this.ticketLockArea.lock(chunkX, chunkZ) : null; ++ try { ++ final SortedArraySet<Ticket<?>> ticketsAtChunk = this.tickets.computeIfAbsent(chunkCoord, (final RegionFileIOThread.ChunkCoordinate keyInMap) -> { ++ return SortedArraySet.create(4); ++ }); ++ ++ final int levelBefore = getTicketLevelAt(ticketsAtChunk); ++ final Ticket<T> current = (Ticket<T>)ticketsAtChunk.replace(ticket); ++ final int levelAfter = getTicketLevelAt(ticketsAtChunk); ++ ++ if (current != ticket) { ++ final long oldRemoveDelay = current.removeDelay; ++ if (removeDelay != oldRemoveDelay) { ++ if (oldRemoveDelay != NO_TIMEOUT_MARKER && removeDelay == NO_TIMEOUT_MARKER) { ++ this.removeExpireCount(chunkX, chunkZ); ++ } else if (oldRemoveDelay == NO_TIMEOUT_MARKER) { ++ // since old != new, we have that NO_TIMEOUT_MARKER != new ++ this.addExpireCount(chunkX, chunkZ); ++ } ++ } ++ } else { ++ if (removeDelay != NO_TIMEOUT_MARKER) { ++ this.addExpireCount(chunkX, chunkZ); ++ } ++ } ++ ++ if (levelBefore != levelAfter) { ++ this.updateTicketLevel(chunk, levelAfter); ++ } ++ ++ return current == ticket; ++ } finally { ++ if (ticketLock != null) { ++ this.ticketLockArea.unlock(ticketLock); ++ } ++ } ++ } ++ ++ public <T> boolean removeTicketAtLevel(final TicketType<T> type, final ChunkPos chunkPos, final int level, final T identifier) { ++ return this.removeTicketAtLevel(type, CoordinateUtils.getChunkKey(chunkPos), level, identifier); ++ } ++ ++ public <T> boolean removeTicketAtLevel(final TicketType<T> type, final int chunkX, final int chunkZ, final int level, final T identifier) { ++ return this.removeTicketAtLevel(type, CoordinateUtils.getChunkKey(chunkX, chunkZ), level, identifier); ++ } ++ ++ public <T> boolean removeTicketAtLevel(final TicketType<T> type, final long chunk, final int level, final T identifier) { ++ return this.removeTicketAtLevel(type, chunk, level, identifier, true); ++ } ++ ++ <T> boolean removeTicketAtLevel(final TicketType<T> type, final long chunk, final int level, final T identifier, final boolean lock) { ++ if (level > MAX_TICKET_LEVEL) { ++ return false; ++ } ++ ++ final int chunkX = CoordinateUtils.getChunkX(chunk); ++ final int chunkZ = CoordinateUtils.getChunkZ(chunk); ++ final RegionFileIOThread.ChunkCoordinate chunkCoord = new RegionFileIOThread.ChunkCoordinate(chunk); ++ final Ticket<T> probe = new Ticket<>(type, level, identifier, PROBE_MARKER); ++ ++ final ReentrantAreaLock.Node ticketLock = lock ? this.ticketLockArea.lock(chunkX, chunkZ) : null; ++ try { ++ final SortedArraySet<Ticket<?>> ticketsAtChunk = this.tickets.get(chunkCoord); ++ if (ticketsAtChunk == null) { ++ return false; ++ } ++ ++ final int oldLevel = getTicketLevelAt(ticketsAtChunk); ++ final Ticket<T> ticket = (Ticket<T>)ticketsAtChunk.removeAndGet(probe); ++ ++ if (ticket == null) { ++ return false; ++ } ++ ++ final int newLevel = getTicketLevelAt(ticketsAtChunk); ++ // we should not change the ticket levels while the target region may be ticking ++ if (oldLevel != newLevel) { ++ // Delay unload chunk patch originally by Aikar, updated to 1.20 by jpenilla ++ // these days, the patch is mostly useful to keep chunks ticking when players teleport ++ // so that their pets can teleport with them as well. ++ final long delayTimeout = this.world.paperConfig().chunks.delayChunkUnloadsBy.ticks(); ++ final TicketType<ChunkPos> toAdd; ++ final long timeout; ++ if (type == RegionizedPlayerChunkLoader.REGION_PLAYER_TICKET && delayTimeout > 0) { ++ toAdd = TicketType.DELAY_UNLOAD; ++ timeout = delayTimeout; ++ } else { ++ toAdd = TicketType.UNKNOWN; ++ // always expect UNKNOWN to be > 1, but just in case ++ timeout = Math.max(1, toAdd.timeout); ++ } ++ final Ticket<ChunkPos> unknownTicket = new Ticket<>(toAdd, level, new ChunkPos(chunk), timeout); ++ if (ticketsAtChunk.add(unknownTicket)) { ++ this.addExpireCount(chunkX, chunkZ); ++ } else { ++ throw new IllegalStateException("Should have been able to add " + unknownTicket + " to " + ticketsAtChunk); ++ } ++ } ++ ++ final long removeDelay = ticket.removeDelay; ++ if (removeDelay != NO_TIMEOUT_MARKER) { ++ this.removeExpireCount(chunkX, chunkZ); ++ } ++ ++ return true; ++ } finally { ++ if (ticketLock != null) { ++ this.ticketLockArea.unlock(ticketLock); ++ } ++ } ++ } ++ ++ // atomic with respect to all add/remove/addandremove ticket calls for the given chunk ++ public <T, V> void addAndRemoveTickets(final long chunk, final TicketType<T> addType, final int addLevel, final T addIdentifier, ++ final TicketType<V> removeType, final int removeLevel, final V removeIdentifier) { ++ final ReentrantAreaLock.Node ticketLock = this.ticketLockArea.lock(CoordinateUtils.getChunkX(chunk), CoordinateUtils.getChunkZ(chunk)); ++ try { ++ this.addTicketAtLevel(addType, chunk, addLevel, addIdentifier, false); ++ this.removeTicketAtLevel(removeType, chunk, removeLevel, removeIdentifier, false); ++ } finally { ++ this.ticketLockArea.unlock(ticketLock); ++ } ++ } ++ ++ // atomic with respect to all add/remove/addandremove ticket calls for the given chunk ++ public <T, V> boolean addIfRemovedTicket(final long chunk, final TicketType<T> addType, final int addLevel, final T addIdentifier, ++ final TicketType<V> removeType, final int removeLevel, final V removeIdentifier) { ++ final ReentrantAreaLock.Node ticketLock = this.ticketLockArea.lock(CoordinateUtils.getChunkX(chunk), CoordinateUtils.getChunkZ(chunk)); ++ try { ++ if (this.removeTicketAtLevel(removeType, chunk, removeLevel, removeIdentifier, false)) { ++ this.addTicketAtLevel(addType, chunk, addLevel, addIdentifier, false); ++ return true; ++ } ++ return false; ++ } finally { ++ this.ticketLockArea.unlock(ticketLock); ++ } ++ } ++ ++ public <T> void removeAllTicketsFor(final TicketType<T> ticketType, final int ticketLevel, final T ticketIdentifier) { ++ if (ticketLevel > MAX_TICKET_LEVEL) { ++ return; ++ } ++ ++ final Long2ObjectOpenHashMap<List<RegionFileIOThread.ChunkCoordinate>> sections = new Long2ObjectOpenHashMap(); ++ final int sectionShift = this.taskScheduler.getChunkSystemLockShift(); ++ for (final RegionFileIOThread.ChunkCoordinate coord : this.tickets.keySet()) { ++ sections.computeIfAbsent( ++ CoordinateUtils.getChunkKey( ++ CoordinateUtils.getChunkX(coord.key) >> sectionShift, ++ CoordinateUtils.getChunkZ(coord.key) >> sectionShift ++ ), ++ (final long keyInMap) -> { ++ return new ArrayList<>(); ++ } ++ ).add(coord); ++ } ++ ++ for (final Iterator<Long2ObjectMap.Entry<List<RegionFileIOThread.ChunkCoordinate>>> iterator = sections.long2ObjectEntrySet().fastIterator(); ++ iterator.hasNext();) { ++ final Long2ObjectMap.Entry<List<RegionFileIOThread.ChunkCoordinate>> entry = iterator.next(); ++ final long sectionKey = entry.getLongKey(); ++ final List<RegionFileIOThread.ChunkCoordinate> coordinates = entry.getValue(); ++ ++ final ReentrantAreaLock.Node ticketLock = this.ticketLockArea.lock( ++ CoordinateUtils.getChunkX(sectionKey) << sectionShift, ++ CoordinateUtils.getChunkZ(sectionKey) << sectionShift ++ ); ++ try { ++ for (final RegionFileIOThread.ChunkCoordinate coord : coordinates) { ++ this.removeTicketAtLevel(ticketType, coord.key, ticketLevel, ticketIdentifier, false); ++ } ++ } finally { ++ this.ticketLockArea.unlock(ticketLock); ++ } ++ } ++ } ++ ++ public void tick() { ++ final int sectionShift = this.world.getRegionChunkShift(); ++ ++ final Predicate<Ticket<?>> expireNow = (final Ticket<?> ticket) -> { ++ if (ticket.removeDelay == NO_TIMEOUT_MARKER) { ++ return false; ++ } ++ return --ticket.removeDelay <= 0L; ++ }; ++ ++ for (final Iterator<RegionFileIOThread.ChunkCoordinate> iterator = this.sectionToChunkToExpireCount.keySet().iterator(); iterator.hasNext();) { ++ final RegionFileIOThread.ChunkCoordinate section = iterator.next(); ++ final long sectionKey = section.key; ++ ++ if (!this.sectionToChunkToExpireCount.containsKey(section)) { ++ // removed concurrently ++ continue; ++ } ++ ++ final ReentrantAreaLock.Node ticketLock = this.ticketLockArea.lock( ++ CoordinateUtils.getChunkX(sectionKey) << sectionShift, ++ CoordinateUtils.getChunkZ(sectionKey) << sectionShift ++ ); ++ ++ try { ++ final Long2IntOpenHashMap chunkToExpireCount = this.sectionToChunkToExpireCount.get(section); ++ if (chunkToExpireCount == null) { ++ // lost to some race ++ continue; ++ } ++ ++ for (final Iterator<Long2IntMap.Entry> iterator1 = chunkToExpireCount.long2IntEntrySet().fastIterator(); iterator1.hasNext();) { ++ final Long2IntMap.Entry entry = iterator1.next(); ++ ++ final long chunkKey = entry.getLongKey(); ++ final int expireCount = entry.getIntValue(); ++ ++ final RegionFileIOThread.ChunkCoordinate chunk = new RegionFileIOThread.ChunkCoordinate(chunkKey); ++ ++ final SortedArraySet<Ticket<?>> tickets = this.tickets.get(chunk); ++ final int levelBefore = getTicketLevelAt(tickets); ++ ++ final int sizeBefore = tickets.size(); ++ tickets.removeIf(expireNow); ++ final int sizeAfter = tickets.size(); ++ final int levelAfter = getTicketLevelAt(tickets); ++ ++ if (tickets.isEmpty()) { ++ this.tickets.remove(chunk); ++ } ++ if (levelBefore != levelAfter) { ++ this.updateTicketLevel(chunkKey, levelAfter); ++ } ++ ++ final int newExpireCount = expireCount - (sizeBefore - sizeAfter); ++ ++ if (newExpireCount == expireCount) { ++ continue; ++ } ++ ++ if (newExpireCount != 0) { ++ entry.setValue(newExpireCount); ++ } else { ++ iterator1.remove(); ++ } ++ } ++ ++ if (chunkToExpireCount.isEmpty()) { ++ this.sectionToChunkToExpireCount.remove(section); ++ } ++ } finally { ++ this.ticketLockArea.unlock(ticketLock); ++ } ++ } ++ ++ this.processTicketUpdates(); ++ } ++ ++ public NewChunkHolder getChunkHolder(final int chunkX, final int chunkZ) { ++ return this.chunkHolders.get(CoordinateUtils.getChunkKey(chunkX, chunkZ)); ++ } ++ ++ public NewChunkHolder getChunkHolder(final long position) { ++ return this.chunkHolders.get(position); ++ } ++ ++ public void raisePriority(final int x, final int z, final PrioritisedExecutor.Priority priority) { ++ final NewChunkHolder chunkHolder = this.getChunkHolder(x, z); ++ if (chunkHolder != null) { ++ chunkHolder.raisePriority(priority); ++ } ++ } ++ ++ public void setPriority(final int x, final int z, final PrioritisedExecutor.Priority priority) { ++ final NewChunkHolder chunkHolder = this.getChunkHolder(x, z); ++ if (chunkHolder != null) { ++ chunkHolder.setPriority(priority); ++ } ++ } ++ ++ public void lowerPriority(final int x, final int z, final PrioritisedExecutor.Priority priority) { ++ final NewChunkHolder chunkHolder = this.getChunkHolder(x, z); ++ if (chunkHolder != null) { ++ chunkHolder.lowerPriority(priority); ++ } ++ } ++ ++ private NewChunkHolder createChunkHolder(final long position) { ++ final NewChunkHolder ret = new NewChunkHolder(this.world, CoordinateUtils.getChunkX(position), CoordinateUtils.getChunkZ(position), this.taskScheduler); ++ ++ ChunkSystem.onChunkHolderCreate(this.world, ret.vanillaChunkHolder); ++ ret.vanillaChunkHolder.onChunkAdd(); ++ ++ return ret; ++ } ++ ++ // because this function creates the chunk holder without a ticket, it is the caller's responsibility to ensure ++ // the chunk holder eventually unloads. this should only be used to avoid using processTicketUpdates to create chunkholders, ++ // as processTicketUpdates may call plugin logic; in every other case a ticket is appropriate ++ private NewChunkHolder getOrCreateChunkHolder(final int chunkX, final int chunkZ) { ++ return this.getOrCreateChunkHolder(CoordinateUtils.getChunkKey(chunkX, chunkZ)); ++ } ++ ++ private NewChunkHolder getOrCreateChunkHolder(final long position) { ++ final int chunkX = CoordinateUtils.getChunkX(position); ++ final int chunkZ = CoordinateUtils.getChunkZ(position); ++ ++ if (!this.ticketLockArea.isHeldByCurrentThread(chunkX, chunkZ)) { ++ throw new IllegalStateException("Must hold ticket level update lock!"); ++ } ++ if (!this.taskScheduler.schedulingLockArea.isHeldByCurrentThread(chunkX, chunkZ)) { ++ throw new IllegalStateException("Must hold scheduler lock!!"); ++ } ++ ++ // we could just acquire these locks, but... ++ // must own the locks because the caller needs to ensure that no unload can occur AFTER this function returns ++ ++ NewChunkHolder current = this.chunkHolders.get(position); ++ if (current != null) { ++ return current; ++ } ++ ++ current = this.createChunkHolder(position); ++ synchronized (this.chunkHolders) { ++ this.chunkHolders.put(position, current); ++ } ++ ++ return current; ++ } ++ ++ private final AtomicLong entityLoadCounter = new AtomicLong(); ++ ++ public ChunkEntitySlices getOrCreateEntityChunk(final int chunkX, final int chunkZ, final boolean transientChunk) { ++ TickThread.ensureTickThread(this.world, chunkX, chunkZ, "Cannot create entity chunk off-main"); ++ ChunkEntitySlices ret; ++ ++ NewChunkHolder current = this.getChunkHolder(chunkX, chunkZ); ++ if (current != null && (ret = current.getEntityChunk()) != null && (transientChunk || !ret.isTransient())) { ++ return ret; ++ } ++ ++ final AtomicBoolean isCompleted = new AtomicBoolean(); ++ final Thread waiter = Thread.currentThread(); ++ final Long entityLoadId = Long.valueOf(this.entityLoadCounter.getAndIncrement()); ++ NewChunkHolder.GenericDataLoadTaskCallback loadTask = null; ++ final ReentrantAreaLock.Node ticketLock = this.ticketLockArea.lock(chunkX, chunkZ); ++ try { ++ this.addTicketAtLevel(TicketType.ENTITY_LOAD, chunkX, chunkZ, MAX_TICKET_LEVEL, entityLoadId); ++ final ReentrantAreaLock.Node schedulingLock = this.taskScheduler.schedulingLockArea.lock(chunkX, chunkZ); ++ try { ++ current = this.getOrCreateChunkHolder(chunkX, chunkZ); ++ if ((ret = current.getEntityChunk()) != null && (transientChunk || !ret.isTransient())) { ++ this.removeTicketAtLevel(TicketType.ENTITY_LOAD, chunkX, chunkZ, MAX_TICKET_LEVEL, entityLoadId); ++ return ret; ++ } ++ ++ if (current.isEntityChunkNBTLoaded()) { ++ isCompleted.setPlain(true); ++ } else { ++ loadTask = current.getOrLoadEntityData((final GenericDataLoadTask.TaskResult<CompoundTag, Throwable> result) -> { ++ if (!transientChunk) { ++ isCompleted.set(true); ++ LockSupport.unpark(waiter); ++ } ++ }); ++ final ChunkLoadTask.EntityDataLoadTask entityLoad = current.getEntityDataLoadTask(); ++ ++ if (entityLoad != null && !transientChunk) { ++ entityLoad.raisePriority(PrioritisedExecutor.Priority.BLOCKING); ++ } ++ } ++ } finally { ++ this.taskScheduler.schedulingLockArea.unlock(schedulingLock); ++ } ++ } finally { ++ this.ticketLockArea.unlock(ticketLock); ++ } ++ ++ if (loadTask != null) { ++ loadTask.schedule(); ++ } ++ ++ if (!transientChunk) { ++ // Note: no need to busy wait on the chunk queue, entity load will complete off-main ++ boolean interrupted = false; ++ while (!isCompleted.get()) { ++ interrupted |= Thread.interrupted(); ++ LockSupport.park(); ++ } ++ ++ if (interrupted) { ++ Thread.currentThread().interrupt(); ++ } ++ } ++ ++ // now that the entity data is loaded, we can load it into the world ++ ++ ret = current.loadInEntityChunk(transientChunk); ++ ++ final long chunkKey = CoordinateUtils.getChunkKey(chunkX, chunkZ); ++ this.addAndRemoveTickets(chunkKey, ++ TicketType.UNKNOWN, MAX_TICKET_LEVEL, new ChunkPos(chunkX, chunkZ), ++ TicketType.ENTITY_LOAD, MAX_TICKET_LEVEL, entityLoadId ++ ); ++ ++ return ret; ++ } ++ ++ public PoiChunk getPoiChunkIfLoaded(final int chunkX, final int chunkZ, final boolean checkLoadInCallback) { ++ final NewChunkHolder holder = this.getChunkHolder(chunkX, chunkZ); ++ if (holder != null) { ++ final PoiChunk ret = holder.getPoiChunk(); ++ return ret == null || (checkLoadInCallback && !ret.isLoaded()) ? null : ret; ++ } ++ return null; ++ } ++ ++ private final AtomicLong poiLoadCounter = new AtomicLong(); ++ ++ public PoiChunk loadPoiChunk(final int chunkX, final int chunkZ) { ++ TickThread.ensureTickThread(this.world, chunkX, chunkZ, "Cannot create poi chunk off-main"); ++ PoiChunk ret; ++ ++ NewChunkHolder current = this.getChunkHolder(chunkX, chunkZ); ++ if (current != null && (ret = current.getPoiChunk()) != null) { ++ if (!ret.isLoaded()) { ++ ret.load(); ++ } ++ return ret; ++ } ++ ++ final AtomicReference<PoiChunk> completed = new AtomicReference<>(); ++ final AtomicBoolean isCompleted = new AtomicBoolean(); ++ final Thread waiter = Thread.currentThread(); ++ final Long poiLoadId = Long.valueOf(this.poiLoadCounter.getAndIncrement()); ++ NewChunkHolder.GenericDataLoadTaskCallback loadTask = null; ++ final ca.spottedleaf.concurrentutil.lock.ReentrantAreaLock.Node ticketLock = this.ticketLockArea.lock(chunkX, chunkZ); // Folia - use area based lock to reduce contention ++ try { ++ // Folia - use area based lock to reduce contention ++ this.addTicketAtLevel(TicketType.POI_LOAD, chunkX, chunkZ, MAX_TICKET_LEVEL, poiLoadId); ++ final ca.spottedleaf.concurrentutil.lock.ReentrantAreaLock.Node schedulingLock = this.taskScheduler.schedulingLockArea.lock(chunkX, chunkZ); // Folia - use area based lock to reduce contention ++ try { ++ current = this.getOrCreateChunkHolder(chunkX, chunkZ); ++ if (current.isPoiChunkLoaded()) { ++ this.removeTicketAtLevel(TicketType.POI_LOAD, chunkX, chunkZ, MAX_TICKET_LEVEL, poiLoadId); ++ return current.getPoiChunk(); ++ } ++ ++ loadTask = current.getOrLoadPoiData((final GenericDataLoadTask.TaskResult<PoiChunk, Throwable> result) -> { ++ completed.setPlain(result.left()); ++ isCompleted.set(true); ++ LockSupport.unpark(waiter); ++ }); ++ final ChunkLoadTask.PoiDataLoadTask poiLoad = current.getPoiDataLoadTask(); ++ ++ if (poiLoad != null) { ++ poiLoad.raisePriority(PrioritisedExecutor.Priority.BLOCKING); ++ } ++ } finally { ++ this.taskScheduler.schedulingLockArea.unlock(schedulingLock); // Folia - use area based lock to reduce contention ++ } ++ } finally { ++ this.ticketLockArea.unlock(ticketLock); // Folia - use area based lock to reduce contention ++ } ++ ++ if (loadTask != null) { ++ loadTask.schedule(); ++ } ++ ++ // Note: no need to busy wait on the chunk queue, poi load will complete off-main ++ ++ boolean interrupted = false; ++ while (!isCompleted.get()) { ++ interrupted |= Thread.interrupted(); ++ LockSupport.park(); ++ } ++ ++ if (interrupted) { ++ Thread.currentThread().interrupt(); ++ } ++ ++ ret = completed.getPlain(); ++ ++ ret.load(); ++ ++ final long chunkKey = CoordinateUtils.getChunkKey(chunkX, chunkZ); ++ this.addAndRemoveTickets(chunkKey, ++ TicketType.UNKNOWN, MAX_TICKET_LEVEL, new ChunkPos(chunkX, chunkZ), ++ TicketType.POI_LOAD, MAX_TICKET_LEVEL, poiLoadId ++ ); ++ ++ return ret; ++ } ++ ++ void addChangedStatuses(final List<NewChunkHolder> changedFullStatus) { ++ if (changedFullStatus.isEmpty()) { ++ return; ++ } ++ if (!TickThread.isTickThread()) { ++ this.taskScheduler.scheduleChunkTask(() -> { ++ final ArrayDeque<NewChunkHolder> pendingFullLoadUpdate = ChunkHolderManager.this.pendingFullLoadUpdate; ++ for (int i = 0, len = changedFullStatus.size(); i < len; ++i) { ++ pendingFullLoadUpdate.add(changedFullStatus.get(i)); ++ } ++ ++ ChunkHolderManager.this.processPendingFullUpdate(); ++ }, PrioritisedExecutor.Priority.HIGHEST); ++ } else { ++ final ArrayDeque<NewChunkHolder> pendingFullLoadUpdate = this.pendingFullLoadUpdate; ++ for (int i = 0, len = changedFullStatus.size(); i < len; ++i) { ++ pendingFullLoadUpdate.add(changedFullStatus.get(i)); ++ } ++ } ++ } ++ ++ private void removeChunkHolder(final NewChunkHolder holder) { ++ holder.killed = true; ++ holder.vanillaChunkHolder.onChunkRemove(); ++ this.autoSaveQueue.remove(holder); ++ ChunkSystem.onChunkHolderDelete(this.world, holder.vanillaChunkHolder); ++ synchronized (this.chunkHolders) { ++ this.chunkHolders.remove(CoordinateUtils.getChunkKey(holder.chunkX, holder.chunkZ)); ++ } ++ } ++ ++ // note: never call while inside the chunk system, this will absolutely break everything ++ public void processUnloads() { ++ TickThread.ensureTickThread("Cannot unload chunks off-main"); ++ ++ if (BLOCK_TICKET_UPDATES.get() == Boolean.TRUE) { ++ throw new IllegalStateException("Cannot unload chunks recursively"); ++ } ++ final int sectionShift = this.unloadQueue.coordinateShift; // sectionShift <= lock shift ++ final List<ChunkQueue.SectionToUnload> unloadSectionsForRegion = this.unloadQueue.retrieveForAllRegions(); ++ int unloadCountTentative = 0; ++ for (final ChunkQueue.SectionToUnload sectionRef : unloadSectionsForRegion) { ++ final ChunkQueue.UnloadSection section ++ = this.unloadQueue.getSectionUnsynchronized(sectionRef.sectionX(), sectionRef.sectionZ()); ++ ++ if (section == null) { ++ // removed concurrently ++ continue; ++ } ++ ++ // technically reading the size field is unsafe, and it may be incorrect. ++ // We assume that the error here cumulatively goes away over many ticks. If it did not, then it is possible ++ // for chunks to never unload or not unload fast enough. ++ unloadCountTentative += section.chunks.size(); ++ } ++ ++ if (unloadCountTentative <= 0) { ++ // no work to do ++ return; ++ } ++ ++ // Note: The behaviour that we process ticket updates while holding the lock has been dropped here, as it is racey behavior. ++ // But, we do need to process updates here so that any add ticket that is synchronised before this call does not go missed. ++ this.processTicketUpdates(); ++ ++ final int toUnloadCount = Math.max(50, (int)(unloadCountTentative * 0.05)); ++ int processedCount = 0; ++ ++ for (final ChunkQueue.SectionToUnload sectionRef : unloadSectionsForRegion) { ++ final List<NewChunkHolder> stage1 = new ArrayList<>(); ++ final List<NewChunkHolder.UnloadState> stage2 = new ArrayList<>(); ++ ++ final int sectionLowerX = sectionRef.sectionX() << sectionShift; ++ final int sectionLowerZ = sectionRef.sectionZ() << sectionShift; ++ ++ // stage 1: set up for stage 2 while holding critical locks ++ ReentrantAreaLock.Node ticketLock = this.ticketLockArea.lock(sectionLowerX, sectionLowerZ); ++ try { ++ final ReentrantAreaLock.Node scheduleLock = this.taskScheduler.schedulingLockArea.lock(sectionLowerX, sectionLowerZ); ++ try { ++ final ChunkQueue.UnloadSection section ++ = this.unloadQueue.getSectionUnsynchronized(sectionRef.sectionX(), sectionRef.sectionZ()); ++ ++ if (section == null) { ++ // removed concurrently ++ continue; ++ } ++ ++ // collect the holders to run stage 1 on ++ final int sectionCount = section.chunks.size(); ++ ++ if ((sectionCount + processedCount) <= toUnloadCount) { ++ // we can just drain the entire section ++ ++ for (final LongIterator iterator = section.chunks.iterator(); iterator.hasNext();) { ++ final NewChunkHolder holder = this.chunkHolders.get(iterator.nextLong()); ++ if (holder == null) { ++ throw new IllegalStateException(); ++ } ++ stage1.add(holder); ++ } ++ ++ // remove section ++ this.unloadQueue.removeSection(sectionRef.sectionX(), sectionRef.sectionZ()); ++ } else { ++ // processedCount + len = toUnloadCount ++ // we cannot drain the entire section ++ for (int i = 0, len = toUnloadCount - processedCount; i < len; ++i) { ++ final NewChunkHolder holder = this.chunkHolders.get(section.chunks.removeFirstLong()); ++ if (holder == null) { ++ throw new IllegalStateException(); ++ } ++ stage1.add(holder); ++ } ++ } ++ ++ // run stage 1 ++ for (int i = 0, len = stage1.size(); i < len; ++i) { ++ final NewChunkHolder chunkHolder = stage1.get(i); ++ if (chunkHolder.isSafeToUnload() != null) { ++ LOGGER.error("Chunkholder " + chunkHolder + " is not safe to unload but is inside the unload queue?"); ++ continue; ++ } ++ final NewChunkHolder.UnloadState state = chunkHolder.unloadStage1(); ++ if (state == null) { ++ // can unload immediately ++ this.removeChunkHolder(chunkHolder); ++ continue; ++ } ++ stage2.add(state); ++ } ++ } finally { ++ this.taskScheduler.schedulingLockArea.unlock(scheduleLock); ++ } ++ } finally { ++ this.ticketLockArea.unlock(ticketLock); ++ } ++ ++ // stage 2: invoke expensive unload logic, designed to run without locks thanks to stage 1 ++ final List<NewChunkHolder> stage3 = new ArrayList<>(stage2.size()); ++ ++ final Boolean before = this.blockTicketUpdates(); ++ try { ++ for (int i = 0, len = stage2.size(); i < len; ++i) { ++ final NewChunkHolder.UnloadState state = stage2.get(i); ++ final NewChunkHolder holder = state.holder(); ++ ++ holder.unloadStage2(state); ++ stage3.add(holder); ++ } ++ } finally { ++ this.unblockTicketUpdates(before); ++ } ++ ++ // stage 3: actually attempt to remove the chunk holders ++ ticketLock = this.ticketLockArea.lock(sectionLowerX, sectionLowerZ); ++ try { ++ final ReentrantAreaLock.Node scheduleLock = this.taskScheduler.schedulingLockArea.lock(sectionLowerX, sectionLowerZ); ++ try { ++ for (int i = 0, len = stage3.size(); i < len; ++i) { ++ final NewChunkHolder holder = stage3.get(i); ++ ++ if (holder.unloadStage3()) { ++ this.removeChunkHolder(holder); ++ } else { ++ // add cooldown so the next unload check is not immediately next tick ++ this.addTicketAtLevel(TicketType.UNLOAD_COOLDOWN, CoordinateUtils.getChunkKey(holder.chunkX, holder.chunkZ), MAX_TICKET_LEVEL, Unit.INSTANCE, false); ++ } ++ } ++ } finally { ++ this.taskScheduler.schedulingLockArea.unlock(scheduleLock); ++ } ++ } finally { ++ this.ticketLockArea.unlock(ticketLock); ++ } ++ ++ processedCount += stage1.size(); ++ ++ if (processedCount >= toUnloadCount) { ++ break; ++ } ++ } ++ } ++ ++ public enum TicketOperationType { ++ ADD, REMOVE, ADD_IF_REMOVED, ADD_AND_REMOVE ++ } ++ ++ public static record TicketOperation<T, V> ( ++ TicketOperationType op, long chunkCoord, ++ TicketType<T> ticketType, int ticketLevel, T identifier, ++ TicketType<V> ticketType2, int ticketLevel2, V identifier2 ++ ) { ++ ++ private TicketOperation(TicketOperationType op, long chunkCoord, ++ TicketType<T> ticketType, int ticketLevel, T identifier) { ++ this(op, chunkCoord, ticketType, ticketLevel, identifier, null, 0, null); ++ } ++ ++ public static <T> TicketOperation<T, T> addOp(final ChunkPos chunk, final TicketType<T> type, final int ticketLevel, final T identifier) { ++ return addOp(CoordinateUtils.getChunkKey(chunk), type, ticketLevel, identifier); ++ } ++ ++ public static <T> TicketOperation<T, T> addOp(final int chunkX, final int chunkZ, final TicketType<T> type, final int ticketLevel, final T identifier) { ++ return addOp(CoordinateUtils.getChunkKey(chunkX, chunkZ), type, ticketLevel, identifier); ++ } ++ ++ public static <T> TicketOperation<T, T> addOp(final long chunk, final TicketType<T> type, final int ticketLevel, final T identifier) { ++ return new TicketOperation<>(TicketOperationType.ADD, chunk, type, ticketLevel, identifier); ++ } ++ ++ public static <T> TicketOperation<T, T> removeOp(final ChunkPos chunk, final TicketType<T> type, final int ticketLevel, final T identifier) { ++ return removeOp(CoordinateUtils.getChunkKey(chunk), type, ticketLevel, identifier); ++ } ++ ++ public static <T> TicketOperation<T, T> removeOp(final int chunkX, final int chunkZ, final TicketType<T> type, final int ticketLevel, final T identifier) { ++ return removeOp(CoordinateUtils.getChunkKey(chunkX, chunkZ), type, ticketLevel, identifier); ++ } ++ ++ public static <T> TicketOperation<T, T> removeOp(final long chunk, final TicketType<T> type, final int ticketLevel, final T identifier) { ++ return new TicketOperation<>(TicketOperationType.REMOVE, chunk, type, ticketLevel, identifier); ++ } ++ ++ public static <T, V> TicketOperation<T, V> addIfRemovedOp(final long chunk, ++ final TicketType<T> addType, final int addLevel, final T addIdentifier, ++ final TicketType<V> removeType, final int removeLevel, final V removeIdentifier) { ++ return new TicketOperation<>( ++ TicketOperationType.ADD_IF_REMOVED, chunk, addType, addLevel, addIdentifier, ++ removeType, removeLevel, removeIdentifier ++ ); ++ } ++ ++ public static <T, V> TicketOperation<T, V> addAndRemove(final long chunk, ++ final TicketType<T> addType, final int addLevel, final T addIdentifier, ++ final TicketType<V> removeType, final int removeLevel, final V removeIdentifier) { ++ return new TicketOperation<>( ++ TicketOperationType.ADD_AND_REMOVE, chunk, addType, addLevel, addIdentifier, ++ removeType, removeLevel, removeIdentifier ++ ); ++ } ++ } ++ ++ private boolean processTicketOp(TicketOperation operation) { ++ boolean ret = false; ++ switch (operation.op) { ++ case ADD: { ++ ret |= this.addTicketAtLevel(operation.ticketType, operation.chunkCoord, operation.ticketLevel, operation.identifier); ++ break; ++ } ++ case REMOVE: { ++ ret |= this.removeTicketAtLevel(operation.ticketType, operation.chunkCoord, operation.ticketLevel, operation.identifier); ++ break; ++ } ++ case ADD_IF_REMOVED: { ++ ret |= this.addIfRemovedTicket( ++ operation.chunkCoord, ++ operation.ticketType, operation.ticketLevel, operation.identifier, ++ operation.ticketType2, operation.ticketLevel2, operation.identifier2 ++ ); ++ break; ++ } ++ case ADD_AND_REMOVE: { ++ ret = true; ++ this.addAndRemoveTickets( ++ operation.chunkCoord, ++ operation.ticketType, operation.ticketLevel, operation.identifier, ++ operation.ticketType2, operation.ticketLevel2, operation.identifier2 ++ ); ++ break; ++ } ++ } ++ ++ return ret; ++ } ++ ++ public void performTicketUpdates(final Collection<TicketOperation<?, ?>> operations) { ++ for (final TicketOperation<?, ?> operation : operations) { ++ this.processTicketOp(operation); ++ } ++ } ++ ++ private final ThreadLocal<Boolean> BLOCK_TICKET_UPDATES = ThreadLocal.withInitial(() -> { ++ return Boolean.FALSE; ++ }); ++ ++ public Boolean blockTicketUpdates() { ++ final Boolean ret = BLOCK_TICKET_UPDATES.get(); ++ BLOCK_TICKET_UPDATES.set(Boolean.TRUE); ++ return ret; ++ } ++ ++ public void unblockTicketUpdates(final Boolean before) { ++ BLOCK_TICKET_UPDATES.set(before); ++ } ++ ++ public boolean processTicketUpdates() { ++ return this.processTicketUpdates(true, true, null); ++ } ++ ++ private static final ThreadLocal<List<ChunkProgressionTask>> CURRENT_TICKET_UPDATE_SCHEDULING = new ThreadLocal<>(); ++ ++ static List<ChunkProgressionTask> getCurrentTicketUpdateScheduling() { ++ return CURRENT_TICKET_UPDATE_SCHEDULING.get(); ++ } ++ ++ private boolean processTicketUpdates(final boolean checkLocks, final boolean processFullUpdates, List<ChunkProgressionTask> scheduledTasks) { ++ TickThread.ensureTickThread("Cannot process ticket levels off-main"); ++ if (BLOCK_TICKET_UPDATES.get() == Boolean.TRUE) { ++ throw new IllegalStateException("Cannot update ticket level while unloading chunks or updating entity manager"); ++ } ++ ++ List<NewChunkHolder> changedFullStatus = null; ++ ++ final boolean isTickThread = TickThread.isTickThread(); ++ ++ boolean ret = false; ++ final boolean canProcessFullUpdates = processFullUpdates & isTickThread; ++ final boolean canProcessScheduling = scheduledTasks == null; ++ ++ if (this.ticketLevelPropagator.hasPendingUpdates()) { ++ if (scheduledTasks == null) { ++ scheduledTasks = new ArrayList<>(); ++ } ++ changedFullStatus = new ArrayList<>(); ++ ++ ret |= this.ticketLevelPropagator.performUpdates( ++ this.ticketLockArea, this.taskScheduler.schedulingLockArea, ++ scheduledTasks, changedFullStatus ++ ); ++ } ++ ++ if (changedFullStatus != null) { ++ this.addChangedStatuses(changedFullStatus); ++ } ++ ++ if (canProcessScheduling && scheduledTasks != null) { ++ for (int i = 0, len = scheduledTasks.size(); i < len; ++i) { ++ scheduledTasks.get(i).schedule(); ++ } ++ } ++ ++ if (canProcessFullUpdates) { ++ ret |= this.processPendingFullUpdate(); ++ } ++ ++ return ret; ++ } ++ ++ // only call on tick thread ++ protected final boolean processPendingFullUpdate() { ++ final ArrayDeque<NewChunkHolder> pendingFullLoadUpdate = this.pendingFullLoadUpdate; ++ ++ boolean ret = false; ++ ++ List<NewChunkHolder> changedFullStatus = new ArrayList<>(); ++ ++ NewChunkHolder holder; ++ while ((holder = pendingFullLoadUpdate.poll()) != null) { ++ ret |= holder.handleFullStatusChange(changedFullStatus); ++ ++ if (!changedFullStatus.isEmpty()) { ++ for (int i = 0, len = changedFullStatus.size(); i < len; ++i) { ++ pendingFullLoadUpdate.add(changedFullStatus.get(i)); ++ } ++ changedFullStatus.clear(); ++ } ++ } ++ ++ return ret; ++ } ++ ++ public JsonObject getDebugJsonForWatchdog() { ++ return this.getDebugJsonNoLock(); ++ } ++ ++ private JsonObject getDebugJsonNoLock() { ++ final JsonObject ret = new JsonObject(); ++ ret.addProperty("current_tick", Long.valueOf(this.currentTick)); ++ ++ final JsonArray unloadQueue = new JsonArray(); ++ ret.add("unload_queue", unloadQueue); ++ ret.addProperty("lock_shift", Integer.valueOf(this.taskScheduler.getChunkSystemLockShift())); ++ ret.addProperty("ticket_shift", Integer.valueOf(ThreadedTicketLevelPropagator.SECTION_SHIFT)); ++ ret.addProperty("region_shift", Integer.valueOf(this.world.getRegionChunkShift())); ++ for (final ChunkQueue.SectionToUnload section : this.unloadQueue.retrieveForAllRegions()) { ++ final JsonObject sectionJson = new JsonObject(); ++ unloadQueue.add(sectionJson); ++ sectionJson.addProperty("sectionX", section.sectionX()); ++ sectionJson.addProperty("sectionZ", section.sectionX()); ++ sectionJson.addProperty("order", section.order()); ++ ++ final JsonArray coordinates = new JsonArray(); ++ sectionJson.add("coordinates", coordinates); ++ ++ final ChunkQueue.UnloadSection actualSection = this.unloadQueue.getSectionUnsynchronized(section.sectionX(), section.sectionZ()); ++ for (final LongIterator iterator = actualSection.chunks.iterator(); iterator.hasNext();) { ++ final long coordinate = iterator.nextLong(); ++ ++ final JsonObject coordinateJson = new JsonObject(); ++ coordinates.add(coordinateJson); ++ ++ coordinateJson.addProperty("chunkX", Integer.valueOf(CoordinateUtils.getChunkX(coordinate))); ++ coordinateJson.addProperty("chunkZ", Integer.valueOf(CoordinateUtils.getChunkZ(coordinate))); ++ } ++ } ++ ++ final JsonArray holders = new JsonArray(); ++ ret.add("chunkholders", holders); ++ ++ for (final NewChunkHolder holder : this.getChunkHolders()) { ++ holders.add(holder.getDebugJson()); ++ } ++ ++ // TODO ++ /* ++ final JsonArray removeTickToChunkExpireTicketCount = new JsonArray(); ++ ret.add("remove_tick_to_chunk_expire_ticket_count", removeTickToChunkExpireTicketCount); ++ ++ for (final Long2ObjectMap.Entry<Long2IntOpenHashMap> tickEntry : this.removeTickToChunkExpireTicketCount.long2ObjectEntrySet()) { ++ final long tick = tickEntry.getLongKey(); ++ final Long2IntOpenHashMap coordinateToCount = tickEntry.getValue(); ++ ++ final JsonObject tickJson = new JsonObject(); ++ removeTickToChunkExpireTicketCount.add(tickJson); ++ ++ tickJson.addProperty("tick", Long.valueOf(tick)); ++ ++ final JsonArray tickEntries = new JsonArray(); ++ tickJson.add("entries", tickEntries); ++ ++ for (final Long2IntMap.Entry entry : coordinateToCount.long2IntEntrySet()) { ++ final long coordinate = entry.getLongKey(); ++ final int count = entry.getIntValue(); ++ ++ final JsonObject entryJson = new JsonObject(); ++ tickEntries.add(entryJson); ++ ++ entryJson.addProperty("chunkX", Long.valueOf(CoordinateUtils.getChunkX(coordinate))); ++ entryJson.addProperty("chunkZ", Long.valueOf(CoordinateUtils.getChunkZ(coordinate))); ++ entryJson.addProperty("count", Integer.valueOf(count)); ++ } ++ } ++ ++ final JsonArray allTicketsJson = new JsonArray(); ++ ret.add("tickets", allTicketsJson); ++ ++ for (final Long2ObjectMap.Entry<SortedArraySet<Ticket<?>>> coordinateTickets : this.tickets.long2ObjectEntrySet()) { ++ final long coordinate = coordinateTickets.getLongKey(); ++ final SortedArraySet<Ticket<?>> tickets = coordinateTickets.getValue(); ++ ++ final JsonObject coordinateJson = new JsonObject(); ++ allTicketsJson.add(coordinateJson); ++ ++ coordinateJson.addProperty("chunkX", Long.valueOf(CoordinateUtils.getChunkX(coordinate))); ++ coordinateJson.addProperty("chunkZ", Long.valueOf(CoordinateUtils.getChunkZ(coordinate))); ++ ++ final JsonArray ticketsSerialized = new JsonArray(); ++ coordinateJson.add("tickets", ticketsSerialized); ++ ++ for (final Ticket<?> ticket : tickets) { ++ final JsonObject ticketSerialized = new JsonObject(); ++ ticketsSerialized.add(ticketSerialized); ++ ++ ticketSerialized.addProperty("type", ticket.getType().toString()); ++ ticketSerialized.addProperty("level", Integer.valueOf(ticket.getTicketLevel())); ++ ticketSerialized.addProperty("identifier", Objects.toString(ticket.key)); ++ ticketSerialized.addProperty("remove_tick", Long.valueOf(ticket.removalTick)); ++ } ++ } ++ */ ++ ++ return ret; ++ } ++ ++ public JsonObject getDebugJson() { ++ return this.getDebugJsonNoLock(); // Folia - use area based lock to reduce contention ++ } ++} +diff --git a/src/main/java/io/papermc/paper/chunk/system/scheduling/ChunkLightTask.java b/src/main/java/io/papermc/paper/chunk/system/scheduling/ChunkLightTask.java +new file mode 100644 +index 0000000000000000000000000000000000000000..86e618586d2ad9d843ad761b7336bb3073ed4c23 +--- /dev/null ++++ b/src/main/java/io/papermc/paper/chunk/system/scheduling/ChunkLightTask.java +@@ -0,0 +1,181 @@ ++package io.papermc.paper.chunk.system.scheduling; ++ ++import ca.spottedleaf.concurrentutil.executor.standard.PrioritisedExecutor; ++import ca.spottedleaf.starlight.common.light.StarLightEngine; ++import ca.spottedleaf.starlight.common.light.StarLightInterface; ++import io.papermc.paper.chunk.system.light.LightQueue; ++import net.minecraft.server.level.ServerLevel; ++import net.minecraft.world.level.ChunkPos; ++import net.minecraft.world.level.chunk.ChunkAccess; ++import net.minecraft.world.level.chunk.status.ChunkStatus; ++import net.minecraft.world.level.chunk.ProtoChunk; ++import org.apache.logging.log4j.LogManager; ++import org.apache.logging.log4j.Logger; ++import java.util.function.BooleanSupplier; ++ ++public final class ChunkLightTask extends ChunkProgressionTask { ++ ++ private static final Logger LOGGER = LogManager.getLogger(); ++ ++ protected final ChunkAccess fromChunk; ++ ++ private final LightTaskPriorityHolder priorityHolder; ++ ++ public ChunkLightTask(final ChunkTaskScheduler scheduler, final ServerLevel world, final int chunkX, final int chunkZ, ++ final ChunkAccess chunk, final PrioritisedExecutor.Priority priority) { ++ super(scheduler, world, chunkX, chunkZ); ++ if (!PrioritisedExecutor.Priority.isValidPriority(priority)) { ++ throw new IllegalArgumentException("Invalid priority " + priority); ++ } ++ this.priorityHolder = new LightTaskPriorityHolder(priority, this); ++ this.fromChunk = chunk; ++ } ++ ++ @Override ++ public boolean isScheduled() { ++ return this.priorityHolder.isScheduled(); ++ } ++ ++ @Override ++ public ChunkStatus getTargetStatus() { ++ return ChunkStatus.LIGHT; ++ } ++ ++ @Override ++ public void schedule() { ++ this.priorityHolder.schedule(); ++ } ++ ++ @Override ++ public void cancel() { ++ this.priorityHolder.cancel(); ++ } ++ ++ @Override ++ public PrioritisedExecutor.Priority getPriority() { ++ return this.priorityHolder.getPriority(); ++ } ++ ++ @Override ++ public void lowerPriority(final PrioritisedExecutor.Priority priority) { ++ this.priorityHolder.raisePriority(priority); ++ } ++ ++ @Override ++ public void setPriority(final PrioritisedExecutor.Priority priority) { ++ this.priorityHolder.setPriority(priority); ++ } ++ ++ @Override ++ public void raisePriority(final PrioritisedExecutor.Priority priority) { ++ this.priorityHolder.raisePriority(priority); ++ } ++ ++ private static final class LightTaskPriorityHolder extends PriorityHolder { ++ ++ protected final ChunkLightTask task; ++ ++ protected LightTaskPriorityHolder(final PrioritisedExecutor.Priority priority, final ChunkLightTask task) { ++ super(priority); ++ this.task = task; ++ } ++ ++ @Override ++ protected void cancelScheduled() { ++ final ChunkLightTask task = this.task; ++ task.complete(null, null); ++ } ++ ++ @Override ++ protected PrioritisedExecutor.Priority getScheduledPriority() { ++ final ChunkLightTask task = this.task; ++ return task.world.getChunkSource().getLightEngine().theLightEngine.lightQueue.getPriority(task.chunkX, task.chunkZ); ++ } ++ ++ @Override ++ protected void scheduleTask(final PrioritisedExecutor.Priority priority) { ++ final ChunkLightTask task = this.task; ++ final StarLightInterface starLightInterface = task.world.getChunkSource().getLightEngine().theLightEngine; ++ final LightQueue lightQueue = starLightInterface.lightQueue; ++ lightQueue.queueChunkLightTask(new ChunkPos(task.chunkX, task.chunkZ), new LightTask(starLightInterface, task), priority); ++ lightQueue.setPriority(task.chunkX, task.chunkZ, priority); ++ } ++ ++ @Override ++ protected void lowerPriorityScheduled(final PrioritisedExecutor.Priority priority) { ++ final ChunkLightTask task = this.task; ++ final StarLightInterface starLightInterface = task.world.getChunkSource().getLightEngine().theLightEngine; ++ final LightQueue lightQueue = starLightInterface.lightQueue; ++ lightQueue.lowerPriority(task.chunkX, task.chunkZ, priority); ++ } ++ ++ @Override ++ protected void setPriorityScheduled(final PrioritisedExecutor.Priority priority) { ++ final ChunkLightTask task = this.task; ++ final StarLightInterface starLightInterface = task.world.getChunkSource().getLightEngine().theLightEngine; ++ final LightQueue lightQueue = starLightInterface.lightQueue; ++ lightQueue.setPriority(task.chunkX, task.chunkZ, priority); ++ } ++ ++ @Override ++ protected void raisePriorityScheduled(final PrioritisedExecutor.Priority priority) { ++ final ChunkLightTask task = this.task; ++ final StarLightInterface starLightInterface = task.world.getChunkSource().getLightEngine().theLightEngine; ++ final LightQueue lightQueue = starLightInterface.lightQueue; ++ lightQueue.raisePriority(task.chunkX, task.chunkZ, priority); ++ } ++ } ++ ++ private static final class LightTask implements BooleanSupplier { ++ ++ protected final StarLightInterface lightEngine; ++ protected final ChunkLightTask task; ++ ++ public LightTask(final StarLightInterface lightEngine, final ChunkLightTask task) { ++ this.lightEngine = lightEngine; ++ this.task = task; ++ } ++ ++ @Override ++ public boolean getAsBoolean() { ++ final ChunkLightTask task = this.task; ++ // executed on light thread ++ if (!task.priorityHolder.markExecuting()) { ++ // cancelled ++ return false; ++ } ++ ++ try { ++ final Boolean[] emptySections = StarLightEngine.getEmptySectionsForChunk(task.fromChunk); ++ ++ if (task.fromChunk.isLightCorrect() && task.fromChunk.getStatus().isOrAfter(ChunkStatus.LIGHT)) { ++ this.lightEngine.forceLoadInChunk(task.fromChunk, emptySections); ++ this.lightEngine.checkChunkEdges(task.chunkX, task.chunkZ); ++ } else { ++ task.fromChunk.setLightCorrect(false); ++ this.lightEngine.lightChunk(task.fromChunk, emptySections); ++ task.fromChunk.setLightCorrect(true); ++ } ++ // we need to advance status ++ if (task.fromChunk instanceof ProtoChunk chunk && chunk.getStatus() == ChunkStatus.LIGHT.getParent()) { ++ chunk.setStatus(ChunkStatus.LIGHT); ++ } ++ } catch (final Throwable thr) { ++ if (!(thr instanceof ThreadDeath)) { ++ LOGGER.fatal("Failed to light chunk " + task.fromChunk.getPos().toString() + " in world '" + this.lightEngine.getWorld().getWorld().getName() + "'", thr); ++ } ++ ++ task.complete(null, thr); ++ ++ if (thr instanceof ThreadDeath) { ++ throw (ThreadDeath)thr; ++ } ++ ++ return true; ++ } ++ ++ task.complete(task.fromChunk, null); ++ return true; ++ } ++ } ++} +diff --git a/src/main/java/io/papermc/paper/chunk/system/scheduling/ChunkLoadTask.java b/src/main/java/io/papermc/paper/chunk/system/scheduling/ChunkLoadTask.java +new file mode 100644 +index 0000000000000000000000000000000000000000..5ff994d5af24b0bdd7b3a16e245b2c4100bef3f0 +--- /dev/null ++++ b/src/main/java/io/papermc/paper/chunk/system/scheduling/ChunkLoadTask.java +@@ -0,0 +1,484 @@ ++package io.papermc.paper.chunk.system.scheduling; ++ ++import ca.spottedleaf.concurrentutil.collection.MultiThreadedQueue; ++import ca.spottedleaf.concurrentutil.executor.standard.PrioritisedExecutor; ++import ca.spottedleaf.concurrentutil.lock.ReentrantAreaLock; ++import ca.spottedleaf.concurrentutil.util.ConcurrentUtil; ++import ca.spottedleaf.dataconverter.minecraft.MCDataConverter; ++import ca.spottedleaf.dataconverter.minecraft.datatypes.MCTypeRegistry; ++import com.mojang.logging.LogUtils; ++import io.papermc.paper.chunk.system.io.RegionFileIOThread; ++import io.papermc.paper.chunk.system.poi.PoiChunk; ++import net.minecraft.SharedConstants; ++import net.minecraft.core.registries.Registries; ++import net.minecraft.nbt.CompoundTag; ++import net.minecraft.server.level.ChunkMap; ++import net.minecraft.server.level.ServerLevel; ++import net.minecraft.world.level.ChunkPos; ++import net.minecraft.world.level.chunk.ChunkAccess; ++import net.minecraft.world.level.chunk.status.ChunkStatus; ++import net.minecraft.world.level.chunk.ProtoChunk; ++import net.minecraft.world.level.chunk.UpgradeData; ++import net.minecraft.world.level.chunk.storage.ChunkSerializer; ++import net.minecraft.world.level.chunk.storage.EntityStorage; ++import net.minecraft.world.level.levelgen.blending.BlendingData; ++import org.slf4j.Logger; ++import java.lang.invoke.VarHandle; ++import java.util.Map; ++import java.util.concurrent.atomic.AtomicInteger; ++import java.util.function.Consumer; ++ ++public final class ChunkLoadTask extends ChunkProgressionTask { ++ ++ private static final Logger LOGGER = LogUtils.getClassLogger(); ++ ++ private final NewChunkHolder chunkHolder; ++ private final ChunkDataLoadTask loadTask; ++ ++ private volatile boolean cancelled; ++ private NewChunkHolder.GenericDataLoadTaskCallback entityLoadTask; ++ private NewChunkHolder.GenericDataLoadTaskCallback poiLoadTask; ++ private GenericDataLoadTask.TaskResult<ChunkAccess, Throwable> loadResult; ++ private final AtomicInteger taskCountToComplete = new AtomicInteger(3); // one for poi, one for entity, and one for chunk data ++ ++ protected ChunkLoadTask(final ChunkTaskScheduler scheduler, final ServerLevel world, final int chunkX, final int chunkZ, ++ final NewChunkHolder chunkHolder, final PrioritisedExecutor.Priority priority) { ++ super(scheduler, world, chunkX, chunkZ); ++ this.chunkHolder = chunkHolder; ++ this.loadTask = new ChunkDataLoadTask(scheduler, world, chunkX, chunkZ, priority); ++ this.loadTask.addCallback((final GenericDataLoadTask.TaskResult<ChunkAccess, Throwable> result) -> { ++ ChunkLoadTask.this.loadResult = result; // must be before getAndDecrement ++ ChunkLoadTask.this.tryCompleteLoad(); ++ }); ++ } ++ ++ private void tryCompleteLoad() { ++ if (this.taskCountToComplete.decrementAndGet() == 0) { ++ final GenericDataLoadTask.TaskResult<ChunkAccess, Throwable> result = this.cancelled ? null : this.loadResult; // only after the getAndDecrement ++ ChunkLoadTask.this.complete(result == null ? null : result.left(), result == null ? null : result.right()); ++ } ++ } ++ ++ @Override ++ public ChunkStatus getTargetStatus() { ++ return ChunkStatus.EMPTY; ++ } ++ ++ private boolean scheduled; ++ ++ @Override ++ public boolean isScheduled() { ++ return this.scheduled; ++ } ++ ++ @Override ++ public void schedule() { ++ final NewChunkHolder.GenericDataLoadTaskCallback entityLoadTask; ++ final NewChunkHolder.GenericDataLoadTaskCallback poiLoadTask; ++ ++ final Consumer<GenericDataLoadTask.TaskResult<?, ?>> scheduleLoadTask = (final GenericDataLoadTask.TaskResult<?, ?> result) -> { ++ ChunkLoadTask.this.tryCompleteLoad(); ++ }; ++ ++ // NOTE: it is IMPOSSIBLE for getOrLoadEntityData/getOrLoadPoiData to complete synchronously, because ++ // they must schedule a task to off main or to on main to complete ++ final ReentrantAreaLock.Node schedulingLock = this.scheduler.schedulingLockArea.lock(this.chunkX, this.chunkZ); ++ try { ++ if (this.scheduled) { ++ throw new IllegalStateException("schedule() called twice"); ++ } ++ this.scheduled = true; ++ if (this.cancelled) { ++ return; ++ } ++ if (!this.chunkHolder.isEntityChunkNBTLoaded()) { ++ entityLoadTask = this.chunkHolder.getOrLoadEntityData((Consumer)scheduleLoadTask); ++ } else { ++ entityLoadTask = null; ++ this.taskCountToComplete.getAndDecrement(); // we know the chunk load is not done here, as it is not scheduled ++ } ++ ++ if (!this.chunkHolder.isPoiChunkLoaded()) { ++ poiLoadTask = this.chunkHolder.getOrLoadPoiData((Consumer)scheduleLoadTask); ++ } else { ++ poiLoadTask = null; ++ this.taskCountToComplete.getAndDecrement(); // we know the chunk load is not done here, as it is not scheduled ++ } ++ ++ this.entityLoadTask = entityLoadTask; ++ this.poiLoadTask = poiLoadTask; ++ } finally { ++ this.scheduler.schedulingLockArea.unlock(schedulingLock); ++ } ++ ++ if (entityLoadTask != null) { ++ entityLoadTask.schedule(); ++ } ++ ++ if (poiLoadTask != null) { ++ poiLoadTask.schedule(); ++ } ++ ++ this.loadTask.schedule(false); ++ } ++ ++ @Override ++ public void cancel() { ++ // must be before load task access, so we can synchronise with the writes to the fields ++ final boolean scheduled; ++ final ReentrantAreaLock.Node schedulingLock = this.scheduler.schedulingLockArea.lock(this.chunkX, this.chunkZ); ++ try { ++ // must read field here, as it may be written later conucrrently - ++ // we need to know if we scheduled _before_ cancellation ++ scheduled = this.scheduled; ++ this.cancelled = true; ++ } finally { ++ this.scheduler.schedulingLockArea.unlock(schedulingLock); ++ } ++ ++ /* ++ Note: The entityLoadTask/poiLoadTask do not complete when cancelled, ++ so we need to manually try to complete in those cases ++ It is also important to note that we set the cancelled field first, just in case ++ the chunk load task attempts to complete with a non-null value ++ */ ++ ++ if (scheduled) { ++ // since we scheduled, we need to cancel the tasks ++ if (this.entityLoadTask != null) { ++ if (this.entityLoadTask.cancel()) { ++ this.tryCompleteLoad(); ++ } ++ } ++ if (this.poiLoadTask != null) { ++ if (this.poiLoadTask.cancel()) { ++ this.tryCompleteLoad(); ++ } ++ } ++ } else { ++ // since nothing was scheduled, we need to decrement the task count here ourselves ++ ++ // for entity load task ++ this.tryCompleteLoad(); ++ ++ // for poi load task ++ this.tryCompleteLoad(); ++ } ++ this.loadTask.cancel(); ++ } ++ ++ @Override ++ public PrioritisedExecutor.Priority getPriority() { ++ return this.loadTask.getPriority(); ++ } ++ ++ @Override ++ public void lowerPriority(final PrioritisedExecutor.Priority priority) { ++ final EntityDataLoadTask entityLoad = this.chunkHolder.getEntityDataLoadTask(); ++ if (entityLoad != null) { ++ entityLoad.lowerPriority(priority); ++ } ++ ++ final PoiDataLoadTask poiLoad = this.chunkHolder.getPoiDataLoadTask(); ++ ++ if (poiLoad != null) { ++ poiLoad.lowerPriority(priority); ++ } ++ ++ this.loadTask.lowerPriority(priority); ++ } ++ ++ @Override ++ public void setPriority(final PrioritisedExecutor.Priority priority) { ++ final EntityDataLoadTask entityLoad = this.chunkHolder.getEntityDataLoadTask(); ++ if (entityLoad != null) { ++ entityLoad.setPriority(priority); ++ } ++ ++ final PoiDataLoadTask poiLoad = this.chunkHolder.getPoiDataLoadTask(); ++ ++ if (poiLoad != null) { ++ poiLoad.setPriority(priority); ++ } ++ ++ this.loadTask.setPriority(priority); ++ } ++ ++ @Override ++ public void raisePriority(final PrioritisedExecutor.Priority priority) { ++ final EntityDataLoadTask entityLoad = this.chunkHolder.getEntityDataLoadTask(); ++ if (entityLoad != null) { ++ entityLoad.raisePriority(priority); ++ } ++ ++ final PoiDataLoadTask poiLoad = this.chunkHolder.getPoiDataLoadTask(); ++ ++ if (poiLoad != null) { ++ poiLoad.raisePriority(priority); ++ } ++ ++ this.loadTask.raisePriority(priority); ++ } ++ ++ protected static abstract class CallbackDataLoadTask<OnMain,FinalCompletion> extends GenericDataLoadTask<OnMain,FinalCompletion> { ++ ++ private TaskResult<FinalCompletion, Throwable> result; ++ private final MultiThreadedQueue<Consumer<TaskResult<FinalCompletion, Throwable>>> waiters = new MultiThreadedQueue<>(); ++ ++ protected volatile boolean completed; ++ protected static final VarHandle COMPLETED_HANDLE = ConcurrentUtil.getVarHandle(CallbackDataLoadTask.class, "completed", boolean.class); ++ ++ protected CallbackDataLoadTask(final ChunkTaskScheduler scheduler, final ServerLevel world, final int chunkX, ++ final int chunkZ, final RegionFileIOThread.RegionFileType type, ++ final PrioritisedExecutor.Priority priority) { ++ super(scheduler, world, chunkX, chunkZ, type, priority); ++ } ++ ++ public void addCallback(final Consumer<TaskResult<FinalCompletion, Throwable>> consumer) { ++ if (!this.waiters.add(consumer)) { ++ try { ++ consumer.accept(this.result); ++ } catch (final Throwable throwable) { ++ this.scheduler.unrecoverableChunkSystemFailure(this.chunkX, this.chunkZ, Map.of( ++ "Consumer", ChunkTaskScheduler.stringIfNull(consumer), ++ "Completed throwable", ChunkTaskScheduler.stringIfNull(this.result.right()) ++ ), throwable); ++ if (throwable instanceof ThreadDeath) { ++ throw (ThreadDeath)throwable; ++ } ++ } ++ } ++ } ++ ++ @Override ++ protected void onComplete(final TaskResult<FinalCompletion, Throwable> result) { ++ if ((boolean)COMPLETED_HANDLE.getAndSet((CallbackDataLoadTask)this, (boolean)true)) { ++ throw new IllegalStateException("Already completed"); ++ } ++ this.result = result; ++ Consumer<TaskResult<FinalCompletion, Throwable>> consumer; ++ while ((consumer = this.waiters.pollOrBlockAdds()) != null) { ++ try { ++ consumer.accept(result); ++ } catch (final Throwable throwable) { ++ this.scheduler.unrecoverableChunkSystemFailure(this.chunkX, this.chunkZ, Map.of( ++ "Consumer", ChunkTaskScheduler.stringIfNull(consumer), ++ "Completed throwable", ChunkTaskScheduler.stringIfNull(result.right()) ++ ), throwable); ++ if (throwable instanceof ThreadDeath) { ++ throw (ThreadDeath)throwable; ++ } ++ return; ++ } ++ } ++ } ++ } ++ ++ public static final class ChunkDataLoadTask extends CallbackDataLoadTask<ChunkAccess, ChunkAccess> { ++ protected ChunkDataLoadTask(final ChunkTaskScheduler scheduler, final ServerLevel world, final int chunkX, ++ final int chunkZ, final PrioritisedExecutor.Priority priority) { ++ super(scheduler, world, chunkX, chunkZ, RegionFileIOThread.RegionFileType.CHUNK_DATA, priority); ++ } ++ ++ @Override ++ protected boolean hasOffMain() { ++ return true; ++ } ++ ++ @Override ++ protected boolean hasOnMain() { ++ return false; ++ } ++ ++ @Override ++ protected PrioritisedExecutor.PrioritisedTask createOffMain(final Runnable run, final PrioritisedExecutor.Priority priority) { ++ return this.scheduler.loadExecutor.createTask(run, priority); ++ } ++ ++ @Override ++ protected PrioritisedExecutor.PrioritisedTask createOnMain(final Runnable run, final PrioritisedExecutor.Priority priority) { ++ throw new UnsupportedOperationException(); ++ } ++ ++ @Override ++ protected TaskResult<ChunkAccess, Throwable> completeOnMainOffMain(final ChunkAccess data, final Throwable throwable) { ++ throw new UnsupportedOperationException(); ++ } ++ ++ private ProtoChunk getEmptyChunk() { ++ return new ProtoChunk( ++ new ChunkPos(this.chunkX, this.chunkZ), UpgradeData.EMPTY, this.world, ++ this.world.registryAccess().registryOrThrow(Registries.BIOME), (BlendingData)null ++ ); ++ } ++ ++ @Override ++ protected TaskResult<ChunkAccess, Throwable> runOffMain(final CompoundTag data, final Throwable throwable) { ++ if (throwable != null) { ++ LOGGER.error("Failed to load chunk data for task: " + this.toString() + ", chunk data will be lost", throwable); ++ return new TaskResult<>(this.getEmptyChunk(), null); ++ } ++ ++ if (data == null) { ++ return new TaskResult<>(this.getEmptyChunk(), null); ++ } ++ ++ // need to convert data, and then deserialize it ++ ++ try { ++ final ChunkPos chunkPos = new ChunkPos(this.chunkX, this.chunkZ); ++ final ChunkMap chunkMap = this.world.getChunkSource().chunkMap; ++ // run converters ++ // note: upgradeChunkTag copies the data already ++ final CompoundTag converted = chunkMap.upgradeChunkTag( ++ this.world.getTypeKey(), chunkMap.overworldDataStorage, data, chunkMap.generator.getTypeNameForDataFixer(), ++ chunkPos, this.world ++ ); ++ // deserialize ++ final ChunkSerializer.InProgressChunkHolder chunkHolder = ChunkSerializer.readInProgressChunkHolder( ++ this.world, chunkMap.getPoiManager(), chunkPos, converted ++ ); ++ ++ return new TaskResult<>(chunkHolder.protoChunk, null); ++ } catch (final ThreadDeath death) { ++ throw death; ++ } catch (final Throwable thr2) { ++ LOGGER.error("Failed to parse chunk data for task: " + this.toString() + ", chunk data will be lost", thr2); ++ return new TaskResult<>(this.getEmptyChunk(), null); ++ } ++ } ++ ++ @Override ++ protected TaskResult<ChunkAccess, Throwable> runOnMain(final ChunkAccess data, final Throwable throwable) { ++ throw new UnsupportedOperationException(); ++ } ++ } ++ ++ public static final class PoiDataLoadTask extends CallbackDataLoadTask<PoiChunk, PoiChunk> { ++ public PoiDataLoadTask(final ChunkTaskScheduler scheduler, final ServerLevel world, final int chunkX, ++ final int chunkZ, final PrioritisedExecutor.Priority priority) { ++ super(scheduler, world, chunkX, chunkZ, RegionFileIOThread.RegionFileType.POI_DATA, priority); ++ } ++ ++ @Override ++ protected boolean hasOffMain() { ++ return true; ++ } ++ ++ @Override ++ protected boolean hasOnMain() { ++ return false; ++ } ++ ++ @Override ++ protected PrioritisedExecutor.PrioritisedTask createOffMain(final Runnable run, final PrioritisedExecutor.Priority priority) { ++ return this.scheduler.loadExecutor.createTask(run, priority); ++ } ++ ++ @Override ++ protected PrioritisedExecutor.PrioritisedTask createOnMain(final Runnable run, final PrioritisedExecutor.Priority priority) { ++ throw new UnsupportedOperationException(); ++ } ++ ++ @Override ++ protected TaskResult<PoiChunk, Throwable> completeOnMainOffMain(final PoiChunk data, final Throwable throwable) { ++ throw new UnsupportedOperationException(); ++ } ++ ++ @Override ++ protected TaskResult<PoiChunk, Throwable> runOffMain(CompoundTag data, final Throwable throwable) { ++ if (throwable != null) { ++ LOGGER.error("Failed to load poi data for task: " + this.toString() + ", poi data will be lost", throwable); ++ return new TaskResult<>(PoiChunk.empty(this.world, this.chunkX, this.chunkZ), null); ++ } ++ ++ if (data == null || data.isEmpty()) { ++ // nothing to do ++ return new TaskResult<>(PoiChunk.empty(this.world, this.chunkX, this.chunkZ), null); ++ } ++ ++ try { ++ data = data.copy(); // coming from the I/O thread, so we need to copy ++ // run converters ++ final int dataVersion = !data.contains(SharedConstants.DATA_VERSION_TAG, net.minecraft.nbt.Tag.TAG_ANY_NUMERIC) ? 1945 : data.getInt(SharedConstants.DATA_VERSION_TAG); ++ final CompoundTag converted = MCDataConverter.convertTag( ++ MCTypeRegistry.POI_CHUNK, data, dataVersion, SharedConstants.getCurrentVersion().getDataVersion().getVersion() ++ ); ++ ++ // now we need to parse it ++ return new TaskResult<>(PoiChunk.parse(this.world, this.chunkX, this.chunkZ, converted), null); ++ } catch (final ThreadDeath death) { ++ throw death; ++ } catch (final Throwable thr2) { ++ LOGGER.error("Failed to run parse poi data for task: " + this.toString() + ", poi data will be lost", thr2); ++ return new TaskResult<>(PoiChunk.empty(this.world, this.chunkX, this.chunkZ), null); ++ } ++ } ++ ++ @Override ++ protected TaskResult<PoiChunk, Throwable> runOnMain(final PoiChunk data, final Throwable throwable) { ++ throw new UnsupportedOperationException(); ++ } ++ } ++ ++ public static final class EntityDataLoadTask extends CallbackDataLoadTask<CompoundTag, CompoundTag> { ++ ++ public EntityDataLoadTask(final ChunkTaskScheduler scheduler, final ServerLevel world, final int chunkX, ++ final int chunkZ, final PrioritisedExecutor.Priority priority) { ++ super(scheduler, world, chunkX, chunkZ, RegionFileIOThread.RegionFileType.ENTITY_DATA, priority); ++ } ++ ++ @Override ++ protected boolean hasOffMain() { ++ return true; ++ } ++ ++ @Override ++ protected boolean hasOnMain() { ++ return false; ++ } ++ ++ @Override ++ protected PrioritisedExecutor.PrioritisedTask createOffMain(final Runnable run, final PrioritisedExecutor.Priority priority) { ++ return this.scheduler.loadExecutor.createTask(run, priority); ++ } ++ ++ @Override ++ protected PrioritisedExecutor.PrioritisedTask createOnMain(final Runnable run, final PrioritisedExecutor.Priority priority) { ++ throw new UnsupportedOperationException(); ++ } ++ ++ @Override ++ protected TaskResult<CompoundTag, Throwable> completeOnMainOffMain(final CompoundTag data, final Throwable throwable) { ++ throw new UnsupportedOperationException(); ++ } ++ ++ @Override ++ protected TaskResult<CompoundTag, Throwable> runOffMain(final CompoundTag data, final Throwable throwable) { ++ if (throwable != null) { ++ LOGGER.error("Failed to load entity data for task: " + this.toString() + ", entity data will be lost", throwable); ++ return new TaskResult<>(null, null); ++ } ++ ++ if (data == null || data.isEmpty()) { ++ // nothing to do ++ return new TaskResult<>(null, null); ++ } ++ ++ try { ++ // note: data comes from the I/O thread, so we need to copy it ++ return new TaskResult<>(EntityStorage.upgradeChunkTag(data.copy()), null); ++ } catch (final ThreadDeath death) { ++ throw death; ++ } catch (final Throwable thr2) { ++ LOGGER.error("Failed to run converters for entity data for task: " + this.toString() + ", entity data will be lost", thr2); ++ return new TaskResult<>(null, thr2); ++ } ++ } ++ ++ @Override ++ protected TaskResult<CompoundTag, Throwable> runOnMain(final CompoundTag data, final Throwable throwable) { ++ throw new UnsupportedOperationException(); ++ } ++ } ++} +diff --git a/src/main/java/io/papermc/paper/chunk/system/scheduling/ChunkProgressionTask.java b/src/main/java/io/papermc/paper/chunk/system/scheduling/ChunkProgressionTask.java +new file mode 100644 +index 0000000000000000000000000000000000000000..b2341328bb22f08836ef18785dc27393a36ce8d6 +--- /dev/null ++++ b/src/main/java/io/papermc/paper/chunk/system/scheduling/ChunkProgressionTask.java +@@ -0,0 +1,105 @@ ++package io.papermc.paper.chunk.system.scheduling; ++ ++import ca.spottedleaf.concurrentutil.collection.MultiThreadedQueue; ++import ca.spottedleaf.concurrentutil.executor.standard.PrioritisedExecutor; ++import ca.spottedleaf.concurrentutil.util.ConcurrentUtil; ++import net.minecraft.server.level.ServerLevel; ++import net.minecraft.world.level.chunk.ChunkAccess; ++import net.minecraft.world.level.chunk.status.ChunkStatus; ++import java.lang.invoke.VarHandle; ++import java.util.Map; ++import java.util.function.BiConsumer; ++ ++public abstract class ChunkProgressionTask { ++ ++ private final MultiThreadedQueue<BiConsumer<ChunkAccess, Throwable>> waiters = new MultiThreadedQueue<>(); ++ private ChunkAccess completedChunk; ++ private Throwable completedThrowable; ++ ++ protected final ChunkTaskScheduler scheduler; ++ protected final ServerLevel world; ++ protected final int chunkX; ++ protected final int chunkZ; ++ ++ protected volatile boolean completed; ++ protected static final VarHandle COMPLETED_HANDLE = ConcurrentUtil.getVarHandle(ChunkProgressionTask.class, "completed", boolean.class); ++ ++ protected ChunkProgressionTask(final ChunkTaskScheduler scheduler, final ServerLevel world, final int chunkX, final int chunkZ) { ++ this.scheduler = scheduler; ++ this.world = world; ++ this.chunkX = chunkX; ++ this.chunkZ = chunkZ; ++ } ++ ++ // Used only for debug json ++ public abstract boolean isScheduled(); ++ ++ // Note: It is the responsibility of the task to set the chunk's status once it has completed ++ public abstract ChunkStatus getTargetStatus(); ++ ++ /* Only executed once */ ++ /* Implementations must be prepared to handle cases where cancel() is called before schedule() */ ++ public abstract void schedule(); ++ ++ /* May be called multiple times */ ++ public abstract void cancel(); ++ ++ public abstract PrioritisedExecutor.Priority getPriority(); ++ ++ /* Schedule lock is always held for the priority update calls */ ++ ++ public abstract void lowerPriority(final PrioritisedExecutor.Priority priority); ++ ++ public abstract void setPriority(final PrioritisedExecutor.Priority priority); ++ ++ public abstract void raisePriority(final PrioritisedExecutor.Priority priority); ++ ++ public final void onComplete(final BiConsumer<ChunkAccess, Throwable> onComplete) { ++ if (!this.waiters.add(onComplete)) { ++ try { ++ onComplete.accept(this.completedChunk, this.completedThrowable); ++ } catch (final Throwable throwable) { ++ this.scheduler.unrecoverableChunkSystemFailure(this.chunkX, this.chunkZ, Map.of( ++ "Consumer", ChunkTaskScheduler.stringIfNull(onComplete), ++ "Completed throwable", ChunkTaskScheduler.stringIfNull(this.completedThrowable) ++ ), throwable); ++ if (throwable instanceof ThreadDeath) { ++ throw (ThreadDeath)throwable; ++ } ++ } ++ } ++ } ++ ++ protected final void complete(final ChunkAccess chunk, final Throwable throwable) { ++ try { ++ this.complete0(chunk, throwable); ++ } catch (final Throwable thr2) { ++ this.scheduler.unrecoverableChunkSystemFailure(this.chunkX, this.chunkZ, Map.of( ++ "Completed throwable", ChunkTaskScheduler.stringIfNull(throwable) ++ ), thr2); ++ if (thr2 instanceof ThreadDeath) { ++ throw (ThreadDeath)thr2; ++ } ++ } ++ } ++ ++ private void complete0(final ChunkAccess chunk, final Throwable throwable) { ++ if ((boolean)COMPLETED_HANDLE.getAndSet((ChunkProgressionTask)this, (boolean)true)) { ++ throw new IllegalStateException("Already completed"); ++ } ++ this.completedChunk = chunk; ++ this.completedThrowable = throwable; ++ ++ BiConsumer<ChunkAccess, Throwable> consumer; ++ while ((consumer = this.waiters.pollOrBlockAdds()) != null) { ++ consumer.accept(chunk, throwable); ++ } ++ } ++ ++ @Override ++ public String toString() { ++ return "ChunkProgressionTask{class: " + this.getClass().getName() + ", for world: " + this.world.getWorld().getName() + ++ ", chunk: (" + this.chunkX + "," + this.chunkZ + "), hashcode: " + System.identityHashCode(this) + ", priority: " + this.getPriority() + ++ ", status: " + this.getTargetStatus().toString() + ", scheduled: " + this.isScheduled() + "}"; ++ } ++} +diff --git a/src/main/java/io/papermc/paper/chunk/system/scheduling/ChunkQueue.java b/src/main/java/io/papermc/paper/chunk/system/scheduling/ChunkQueue.java +new file mode 100644 +index 0000000000000000000000000000000000000000..4cc1b3ba6d093a9683dbd8b7fe76106ae391e019 +--- /dev/null ++++ b/src/main/java/io/papermc/paper/chunk/system/scheduling/ChunkQueue.java +@@ -0,0 +1,160 @@ ++package io.papermc.paper.chunk.system.scheduling; ++ ++import it.unimi.dsi.fastutil.HashCommon; ++import it.unimi.dsi.fastutil.longs.LongLinkedOpenHashSet; ++import java.util.ArrayList; ++import java.util.List; ++import java.util.Map; ++import java.util.concurrent.ConcurrentHashMap; ++import java.util.concurrent.atomic.AtomicLong; ++ ++public final class ChunkQueue { ++ ++ public final int coordinateShift; ++ private final AtomicLong orderGenerator = new AtomicLong(); ++ private final ConcurrentHashMap<Coordinate, UnloadSection> unloadSections = new ConcurrentHashMap<>(); ++ ++ /* ++ * Note: write operations do not occur in parallel for any given section. ++ * Note: coordinateShift <= region shift in order for retrieveForCurrentRegion() to function correctly ++ */ ++ ++ public ChunkQueue(final int coordinateShift) { ++ this.coordinateShift = coordinateShift; ++ } ++ ++ public static record SectionToUnload(int sectionX, int sectionZ, Coordinate coord, long order, int count) {} ++ ++ public List<SectionToUnload> retrieveForAllRegions() { ++ final List<SectionToUnload> ret = new ArrayList<>(); ++ ++ for (final Map.Entry<Coordinate, UnloadSection> entry : this.unloadSections.entrySet()) { ++ final Coordinate coord = entry.getKey(); ++ final long key = coord.key; ++ final UnloadSection section = entry.getValue(); ++ final int sectionX = Coordinate.x(key); ++ final int sectionZ = Coordinate.z(key); ++ ++ ret.add(new SectionToUnload(sectionX, sectionZ, coord, section.order, section.chunks.size())); ++ } ++ ++ ret.sort((final SectionToUnload s1, final SectionToUnload s2) -> { ++ return Long.compare(s1.order, s2.order); ++ }); ++ ++ return ret; ++ } ++ ++ public UnloadSection getSectionUnsynchronized(final int sectionX, final int sectionZ) { ++ final Coordinate coordinate = new Coordinate(Coordinate.key(sectionX, sectionZ)); ++ return this.unloadSections.get(coordinate); ++ } ++ ++ public UnloadSection removeSection(final int sectionX, final int sectionZ) { ++ final Coordinate coordinate = new Coordinate(Coordinate.key(sectionX, sectionZ)); ++ return this.unloadSections.remove(coordinate); ++ } ++ ++ // write operation ++ public boolean addChunk(final int chunkX, final int chunkZ) { ++ final int shift = this.coordinateShift; ++ final int sectionX = chunkX >> shift; ++ final int sectionZ = chunkZ >> shift; ++ final Coordinate coordinate = new Coordinate(Coordinate.key(sectionX, sectionZ)); ++ final long chunkKey = Coordinate.key(chunkX, chunkZ); ++ ++ UnloadSection section = this.unloadSections.get(coordinate); ++ if (section == null) { ++ section = new UnloadSection(this.orderGenerator.getAndIncrement()); ++ // write operations do not occur in parallel for a given section ++ this.unloadSections.put(coordinate, section); ++ } ++ ++ return section.chunks.add(chunkKey); ++ } ++ ++ // write operation ++ public boolean removeChunk(final int chunkX, final int chunkZ) { ++ final int shift = this.coordinateShift; ++ final int sectionX = chunkX >> shift; ++ final int sectionZ = chunkZ >> shift; ++ final Coordinate coordinate = new Coordinate(Coordinate.key(sectionX, sectionZ)); ++ final long chunkKey = Coordinate.key(chunkX, chunkZ); ++ ++ final UnloadSection section = this.unloadSections.get(coordinate); ++ ++ if (section == null) { ++ return false; ++ } ++ ++ if (!section.chunks.remove(chunkKey)) { ++ return false; ++ } ++ ++ if (section.chunks.isEmpty()) { ++ this.unloadSections.remove(coordinate); ++ } ++ ++ return true; ++ } ++ ++ public static final class UnloadSection { ++ ++ public final long order; ++ public final LongLinkedOpenHashSet chunks = new LongLinkedOpenHashSet(); ++ ++ public UnloadSection(final long order) { ++ this.order = order; ++ } ++ } ++ ++ private static final class Coordinate implements Comparable<Coordinate> { ++ ++ public final long key; ++ ++ public Coordinate(final long key) { ++ this.key = key; ++ } ++ ++ public Coordinate(final int x, final int z) { ++ this.key = key(x, z); ++ } ++ ++ public static long key(final int x, final int z) { ++ return ((long)z << 32) | (x & 0xFFFFFFFFL); ++ } ++ ++ public static int x(final long key) { ++ return (int)key; ++ } ++ ++ public static int z(final long key) { ++ return (int)(key >>> 32); ++ } ++ ++ @Override ++ public int hashCode() { ++ return (int)HashCommon.mix(this.key); ++ } ++ ++ @Override ++ public boolean equals(final Object obj) { ++ if (this == obj) { ++ return true; ++ } ++ ++ if (!(obj instanceof Coordinate other)) { ++ return false; ++ } ++ ++ return this.key == other.key; ++ } ++ ++ // This class is intended for HashMap/ConcurrentHashMap usage, which do treeify bin nodes if the chain ++ // is too large. So we should implement compareTo to help. ++ @Override ++ public int compareTo(final Coordinate other) { ++ return Long.compare(this.key, other.key); ++ } ++ } ++} +diff --git a/src/main/java/io/papermc/paper/chunk/system/scheduling/ChunkTaskScheduler.java b/src/main/java/io/papermc/paper/chunk/system/scheduling/ChunkTaskScheduler.java +new file mode 100644 +index 0000000000000000000000000000000000000000..049e20407033073b06fcdeb46c38485f4926d778 +--- /dev/null ++++ b/src/main/java/io/papermc/paper/chunk/system/scheduling/ChunkTaskScheduler.java +@@ -0,0 +1,883 @@ ++package io.papermc.paper.chunk.system.scheduling; ++ ++import ca.spottedleaf.concurrentutil.executor.standard.PrioritisedExecutor; ++import ca.spottedleaf.concurrentutil.executor.standard.PrioritisedThreadPool; ++import ca.spottedleaf.concurrentutil.executor.standard.PrioritisedThreadedTaskQueue; ++import ca.spottedleaf.concurrentutil.lock.ReentrantAreaLock; ++import ca.spottedleaf.concurrentutil.util.ConcurrentUtil; ++import com.mojang.logging.LogUtils; ++import io.papermc.paper.chunk.system.io.RegionFileIOThread; ++import io.papermc.paper.chunk.system.scheduling.queue.RadiusAwarePrioritisedExecutor; ++import io.papermc.paper.configuration.GlobalConfiguration; ++import io.papermc.paper.util.CoordinateUtils; ++import io.papermc.paper.util.TickThread; ++import java.util.function.BooleanSupplier; ++import net.minecraft.CrashReport; ++import net.minecraft.CrashReportCategory; ++import net.minecraft.ReportedException; ++import io.papermc.paper.util.MCUtil; ++import net.minecraft.server.MinecraftServer; ++import net.minecraft.server.level.ChunkMap; ++import net.minecraft.server.level.FullChunkStatus; ++import net.minecraft.server.level.ServerLevel; ++import net.minecraft.server.level.TicketType; ++import net.minecraft.world.level.ChunkPos; ++import net.minecraft.world.level.chunk.ChunkAccess; ++import net.minecraft.world.level.chunk.status.ChunkStatus; ++import net.minecraft.world.level.chunk.LevelChunk; ++import org.bukkit.Bukkit; ++import org.slf4j.Logger; ++import java.io.File; ++import java.util.ArrayDeque; ++import java.util.ArrayList; ++import java.util.Arrays; ++import java.util.Collections; ++import java.util.List; ++import java.util.Map; ++import java.util.Objects; ++import java.util.concurrent.atomic.AtomicBoolean; ++import java.util.concurrent.atomic.AtomicLong; ++import java.util.function.Consumer; ++ ++public final class ChunkTaskScheduler { ++ ++ private static final Logger LOGGER = LogUtils.getClassLogger(); ++ ++ static int newChunkSystemIOThreads; ++ static int newChunkSystemWorkerThreads; ++ static int newChunkSystemGenParallelism; ++ static int newChunkSystemLoadParallelism; ++ ++ public static ca.spottedleaf.concurrentutil.executor.standard.PrioritisedThreadPool workerThreads; ++ ++ private static boolean initialised = false; ++ ++ public static void init(final GlobalConfiguration.ChunkSystem config) { ++ if (initialised) { ++ return; ++ } ++ initialised = true; ++ newChunkSystemIOThreads = config.ioThreads; ++ newChunkSystemWorkerThreads = config.workerThreads; ++ if (newChunkSystemIOThreads < 0) { ++ newChunkSystemIOThreads = 1; ++ } else { ++ newChunkSystemIOThreads = Math.max(1, newChunkSystemIOThreads); ++ } ++ int defaultWorkerThreads = Runtime.getRuntime().availableProcessors() / 2; ++ if (defaultWorkerThreads <= 4) { ++ defaultWorkerThreads = defaultWorkerThreads <= 3 ? 1 : 2; ++ } else { ++ defaultWorkerThreads = defaultWorkerThreads / 2; ++ } ++ defaultWorkerThreads = Integer.getInteger("Paper.WorkerThreadCount", Integer.valueOf(defaultWorkerThreads)); ++ ++ if (newChunkSystemWorkerThreads < 0) { ++ newChunkSystemWorkerThreads = defaultWorkerThreads; ++ } else { ++ newChunkSystemWorkerThreads = Math.max(1, newChunkSystemWorkerThreads); ++ } ++ ++ String newChunkSystemGenParallelism = config.genParallelism; ++ if (newChunkSystemGenParallelism.equalsIgnoreCase("default")) { ++ newChunkSystemGenParallelism = "true"; ++ } ++ boolean useParallelGen; ++ if (newChunkSystemGenParallelism.equalsIgnoreCase("on") || newChunkSystemGenParallelism.equalsIgnoreCase("enabled") ++ || newChunkSystemGenParallelism.equalsIgnoreCase("true")) { ++ useParallelGen = true; ++ } else if (newChunkSystemGenParallelism.equalsIgnoreCase("off") || newChunkSystemGenParallelism.equalsIgnoreCase("disabled") ++ || newChunkSystemGenParallelism.equalsIgnoreCase("false")) { ++ useParallelGen = false; ++ } else { ++ throw new IllegalStateException("Invalid option for gen-parallelism: must be one of [on, off, enabled, disabled, true, false, default]"); ++ } ++ ++ ChunkTaskScheduler.newChunkSystemGenParallelism = useParallelGen ? newChunkSystemWorkerThreads : 1; ++ ChunkTaskScheduler.newChunkSystemLoadParallelism = newChunkSystemWorkerThreads; ++ ++ RegionFileIOThread.init(newChunkSystemIOThreads); ++ workerThreads = new ca.spottedleaf.concurrentutil.executor.standard.PrioritisedThreadPool( ++ "Paper Chunk System Worker Pool", newChunkSystemWorkerThreads, ++ (final Thread thread, final Integer id) -> { ++ thread.setPriority(Thread.NORM_PRIORITY - 2); ++ thread.setName("Tuinity Chunk System Worker #" + id.intValue()); ++ thread.setUncaughtExceptionHandler(io.papermc.paper.chunk.system.scheduling.NewChunkHolder.CHUNKSYSTEM_UNCAUGHT_EXCEPTION_HANDLER); ++ }, (long)(20.0e6)); // 20ms ++ ++ LOGGER.info("Chunk system is using " + newChunkSystemIOThreads + " I/O threads, " + newChunkSystemWorkerThreads + " worker threads, and gen parallelism of " + ChunkTaskScheduler.newChunkSystemGenParallelism + " threads"); ++ } ++ ++ public final ServerLevel world; ++ public final PrioritisedThreadPool workers; ++ public final RadiusAwarePrioritisedExecutor radiusAwareScheduler; ++ public final PrioritisedThreadPool.PrioritisedPoolExecutor parallelGenExecutor; ++ private final PrioritisedThreadPool.PrioritisedPoolExecutor radiusAwareGenExecutor; ++ public final PrioritisedThreadPool.PrioritisedPoolExecutor loadExecutor; ++ ++ private final PrioritisedThreadedTaskQueue mainThreadExecutor = new PrioritisedThreadedTaskQueue(); ++ ++ public final ChunkHolderManager chunkHolderManager; ++ ++ static { ++ ChunkStatus.EMPTY.writeRadius = 0; ++ ChunkStatus.STRUCTURE_STARTS.writeRadius = 0; ++ ChunkStatus.STRUCTURE_REFERENCES.writeRadius = 0; ++ ChunkStatus.BIOMES.writeRadius = 0; ++ ChunkStatus.NOISE.writeRadius = 0; ++ ChunkStatus.SURFACE.writeRadius = 0; ++ ChunkStatus.CARVERS.writeRadius = 0; ++ ChunkStatus.FEATURES.writeRadius = 1; ++ ChunkStatus.INITIALIZE_LIGHT.writeRadius = 0; ++ ChunkStatus.LIGHT.writeRadius = 2; ++ ChunkStatus.SPAWN.writeRadius = 0; ++ ChunkStatus.FULL.writeRadius = 0; ++ ++ /* ++ It's important that the neighbour read radius is taken into account. If _any_ later status is using some chunk as ++ a neighbour, it must be also safe if that neighbour is being generated. i.e for any status later than FEATURES, ++ for a status to be parallel safe it must not read the block data from its neighbours. ++ */ ++ final List<ChunkStatus> parallelCapableStatus = Arrays.asList( ++ // No-op executor. ++ ChunkStatus.EMPTY, ++ ++ // This is parallel capable, as CB has fixed the concurrency issue with stronghold generations. ++ // Does not touch neighbour chunks. ++ ChunkStatus.STRUCTURE_STARTS, ++ ++ // Surprisingly this is parallel capable. It is simply reading the already-created structure starts ++ // into the structure references for the chunk. So while it reads from it neighbours, its neighbours ++ // will not change, even if executed in parallel. ++ ChunkStatus.STRUCTURE_REFERENCES, ++ ++ // Safe. Mojang runs it in parallel as well. ++ ChunkStatus.BIOMES, ++ ++ // Safe. Mojang runs it in parallel as well. ++ ChunkStatus.NOISE, ++ ++ // Parallel safe. Only touches the target chunk. Biome retrieval is now noise based, which is ++ // completely thread-safe. ++ ChunkStatus.SURFACE, ++ ++ // No global state is modified in the carvers. It only touches the specified chunk. So it is parallel safe. ++ ChunkStatus.CARVERS, ++ ++ // FEATURES is not parallel safe. It writes to neighbours. ++ ++ // no-op executor ++ ChunkStatus.INITIALIZE_LIGHT ++ ++ // LIGHT is not parallel safe. It also doesn't run on the generation executor, so no point. ++ ++ // Only writes to the specified chunk. State is not read by later statuses. Parallel safe. ++ // Note: it may look unsafe because it writes to a worldgenregion, but the region size is always 0 - ++ // see the task margin. ++ // However, if the neighbouring FEATURES chunk is unloaded, but then fails to load in again (for whatever ++ // reason), then it would write to this chunk - and since this status reads blocks from itself, it's not ++ // safe to execute this in parallel. ++ // SPAWN ++ ++ // FULL is executed on main. ++ ); ++ ++ for (final ChunkStatus status : parallelCapableStatus) { ++ status.isParallelCapable = true; ++ } ++ } ++ ++ private static final int[] ACCESS_RADIUS_TABLE = new int[ChunkStatus.getStatusList().size()]; ++ private static final int[] MAX_ACCESS_RADIUS_TABLE = new int[ACCESS_RADIUS_TABLE.length]; ++ static { ++ Arrays.fill(ACCESS_RADIUS_TABLE, -1); ++ } ++ ++ private static int getAccessRadius0(final ChunkStatus genStatus) { ++ if (genStatus == ChunkStatus.EMPTY) { ++ return 0; ++ } ++ ++ final int radius = Math.max(genStatus.loadRange, genStatus.getRange()); ++ int maxRange = radius; ++ ++ for (int dist = 1; dist <= radius; ++dist) { ++ final ChunkStatus requiredNeighbourStatus = ChunkMap.getDependencyStatus(genStatus, radius); ++ final int rad = ACCESS_RADIUS_TABLE[requiredNeighbourStatus.getIndex()]; ++ if (rad == -1) { ++ throw new IllegalStateException(); ++ } ++ ++ maxRange = Math.max(maxRange, dist + rad); ++ } ++ ++ return maxRange; ++ } ++ ++ private static int maxAccessRadius; ++ ++ static { ++ final List<ChunkStatus> statuses = ChunkStatus.getStatusList(); ++ for (int i = 0, len = statuses.size(); i < len; ++i) { ++ ACCESS_RADIUS_TABLE[i] = getAccessRadius0(statuses.get(i)); ++ } ++ int max = 0; ++ for (int i = 0, len = statuses.size(); i < len; ++i) { ++ MAX_ACCESS_RADIUS_TABLE[i] = max = Math.max(ACCESS_RADIUS_TABLE[i], max); ++ } ++ maxAccessRadius = max; ++ } ++ ++ public static int getMaxAccessRadius() { ++ return maxAccessRadius; ++ } ++ ++ public static int getAccessRadius(final ChunkStatus genStatus) { ++ return ACCESS_RADIUS_TABLE[genStatus.getIndex()]; ++ } ++ ++ public static int getAccessRadius(final FullChunkStatus status) { ++ return (status.ordinal() - 1) + getAccessRadius(ChunkStatus.FULL); ++ } ++ ++ final ReentrantAreaLock schedulingLockArea; ++ private final int lockShift; ++ ++ public final int getChunkSystemLockShift() { ++ return this.lockShift; ++ } ++ // Folia end - use area based lock to reduce contention ++ ++ public ChunkTaskScheduler(final ServerLevel world, final PrioritisedThreadPool workers) { ++ this.world = world; ++ this.workers = workers; ++ // must be >= region shift (in paper, doesn't exist) and must be >= ticket propagator section shift ++ // it must be >= region shift since the regioniser assumes ticket updates do not occur in parallel for the region sections ++ // it must be >= ticket propagator section shift so that the ticket propagator can assume that owning a position implies owning ++ // the entire section ++ // we just take the max, as we want the smallest shift that satisfies these properties ++ this.lockShift = Math.max(world.getRegionChunkShift(), ThreadedTicketLevelPropagator.SECTION_SHIFT); ++ this.schedulingLockArea = new ReentrantAreaLock(this.getChunkSystemLockShift()); ++ ++ final String worldName = world.getWorld().getName(); ++ this.parallelGenExecutor = workers.createExecutor("Chunk parallel generation executor for world '" + worldName + "'", Math.max(1, newChunkSystemGenParallelism)); ++ this.radiusAwareGenExecutor = ++ newChunkSystemGenParallelism <= 1 ? this.parallelGenExecutor : workers.createExecutor("Chunk radius aware generator for world '" + worldName + "'", newChunkSystemGenParallelism); ++ this.loadExecutor = workers.createExecutor("Chunk load executor for world '" + worldName + "'", newChunkSystemLoadParallelism); ++ this.radiusAwareScheduler = new RadiusAwarePrioritisedExecutor(this.radiusAwareGenExecutor, Math.max(1, newChunkSystemGenParallelism)); ++ this.chunkHolderManager = new ChunkHolderManager(world, this); ++ } ++ ++ private final AtomicBoolean failedChunkSystem = new AtomicBoolean(); ++ ++ public static Object stringIfNull(final Object obj) { ++ return obj == null ? "null" : obj; ++ } ++ ++ public void unrecoverableChunkSystemFailure(final int chunkX, final int chunkZ, final Map<String, Object> objectsOfInterest, final Throwable thr) { ++ final NewChunkHolder holder = this.chunkHolderManager.getChunkHolder(chunkX, chunkZ); ++ LOGGER.error("Chunk system error at chunk (" + chunkX + "," + chunkZ + "), holder: " + holder + ", exception:", new Throwable(thr)); ++ ++ if (this.failedChunkSystem.getAndSet(true)) { ++ return; ++ } ++ ++ final ReportedException reportedException = thr instanceof ReportedException ? (ReportedException)thr : new ReportedException(new CrashReport("Chunk system error", thr)); ++ ++ CrashReportCategory crashReportCategory = reportedException.getReport().addCategory("Chunk system details"); ++ crashReportCategory.setDetail("Chunk coordinate", new ChunkPos(chunkX, chunkZ).toString()); ++ crashReportCategory.setDetail("ChunkHolder", Objects.toString(holder)); ++ crashReportCategory.setDetail("unrecoverableChunkSystemFailure caller thread", Thread.currentThread().getName()); ++ ++ crashReportCategory = reportedException.getReport().addCategory("Chunk System Objects of Interest"); ++ for (final Map.Entry<String, Object> entry : objectsOfInterest.entrySet()) { ++ if (entry.getValue() instanceof Throwable thrObject) { ++ crashReportCategory.setDetailError(Objects.toString(entry.getKey()), thrObject); ++ } else { ++ crashReportCategory.setDetail(Objects.toString(entry.getKey()), Objects.toString(entry.getValue())); ++ } ++ } ++ ++ final Runnable crash = () -> { ++ throw new RuntimeException("Chunk system crash propagated from unrecoverableChunkSystemFailure", reportedException); ++ }; ++ ++ // this may not be good enough, specifically thanks to stupid ass plugins swallowing exceptions ++ this.scheduleChunkTask(chunkX, chunkZ, crash, PrioritisedExecutor.Priority.BLOCKING); ++ // so, make the main thread pick it up ++ MinecraftServer.chunkSystemCrash = new RuntimeException("Chunk system crash propagated from unrecoverableChunkSystemFailure", reportedException); ++ } ++ ++ public boolean executeMainThreadTask() { ++ TickThread.ensureTickThread("Cannot execute main thread task off-main"); ++ return this.mainThreadExecutor.executeTask(); ++ } ++ ++ public void raisePriority(final int x, final int z, final PrioritisedExecutor.Priority priority) { ++ this.chunkHolderManager.raisePriority(x, z, priority); ++ } ++ ++ public void setPriority(final int x, final int z, final PrioritisedExecutor.Priority priority) { ++ this.chunkHolderManager.setPriority(x, z, priority); ++ } ++ ++ public void lowerPriority(final int x, final int z, final PrioritisedExecutor.Priority priority) { ++ this.chunkHolderManager.lowerPriority(x, z, priority); ++ } ++ ++ private final AtomicLong chunkLoadCounter = new AtomicLong(); ++ ++ public void scheduleTickingState(final int chunkX, final int chunkZ, final FullChunkStatus toStatus, ++ final boolean addTicket, final PrioritisedExecutor.Priority priority, ++ final Consumer<LevelChunk> onComplete) { ++ if (!TickThread.isTickThread()) { ++ this.scheduleChunkTask(chunkX, chunkZ, () -> { ++ ChunkTaskScheduler.this.scheduleTickingState(chunkX, chunkZ, toStatus, addTicket, priority, onComplete); ++ }, priority); ++ return; ++ } ++ final int accessRadius = getAccessRadius(toStatus); ++ if (this.chunkHolderManager.ticketLockArea.isHeldByCurrentThread(chunkX, chunkZ, accessRadius)) { ++ throw new IllegalStateException("Cannot schedule chunk load during ticket level update"); ++ } ++ if (this.schedulingLockArea.isHeldByCurrentThread(chunkX, chunkZ, accessRadius)) { ++ throw new IllegalStateException("Cannot schedule chunk loading recursively"); ++ } ++ ++ if (toStatus == FullChunkStatus.INACCESSIBLE) { ++ throw new IllegalArgumentException("Cannot wait for INACCESSIBLE status"); ++ } ++ ++ final int minLevel = 33 - (toStatus.ordinal() - 1); ++ final Long chunkReference = addTicket ? Long.valueOf(this.chunkLoadCounter.getAndIncrement()) : null; ++ final long chunkKey = CoordinateUtils.getChunkKey(chunkX, chunkZ); ++ ++ if (addTicket) { ++ this.chunkHolderManager.addTicketAtLevel(TicketType.CHUNK_LOAD, chunkKey, minLevel, chunkReference); ++ this.chunkHolderManager.processTicketUpdates(); ++ } ++ ++ final Consumer<LevelChunk> loadCallback = (final LevelChunk chunk) -> { ++ try { ++ if (onComplete != null) { ++ onComplete.accept(chunk); ++ } ++ } finally { ++ if (addTicket) { ++ ChunkTaskScheduler.this.chunkHolderManager.addAndRemoveTickets(chunkKey, ++ TicketType.UNKNOWN, minLevel, new ChunkPos(chunkKey), ++ TicketType.CHUNK_LOAD, minLevel, chunkReference ++ ); ++ } ++ } ++ }; ++ ++ final boolean scheduled; ++ final LevelChunk chunk; ++ final ReentrantAreaLock.Node ticketLock = this.chunkHolderManager.ticketLockArea.lock(chunkX, chunkZ, accessRadius); ++ try { ++ final ReentrantAreaLock.Node schedulingLock = this.schedulingLockArea.lock(chunkX, chunkZ, accessRadius); ++ try { ++ final NewChunkHolder chunkHolder = this.chunkHolderManager.getChunkHolder(chunkKey); ++ if (chunkHolder == null || chunkHolder.getTicketLevel() > minLevel) { ++ scheduled = false; ++ chunk = null; ++ } else { ++ final FullChunkStatus currStatus = chunkHolder.getChunkStatus(); ++ if (currStatus.isOrAfter(toStatus)) { ++ scheduled = false; ++ chunk = (LevelChunk)chunkHolder.getCurrentChunk(); ++ } else { ++ scheduled = true; ++ chunk = null; ++ ++ final int radius = toStatus.ordinal() - 1; // 0 -> BORDER, 1 -> TICKING, 2 -> ENTITY_TICKING ++ for (int dz = -radius; dz <= radius; ++dz) { ++ for (int dx = -radius; dx <= radius; ++dx) { ++ final NewChunkHolder neighbour = ++ (dx | dz) == 0 ? chunkHolder : this.chunkHolderManager.getChunkHolder(dx + chunkX, dz + chunkZ); ++ if (neighbour != null) { ++ neighbour.raisePriority(priority); ++ } ++ } ++ } ++ ++ // ticket level should schedule for us ++ chunkHolder.addFullStatusConsumer(toStatus, loadCallback); ++ } ++ } ++ } finally { ++ this.schedulingLockArea.unlock(schedulingLock); ++ } ++ } finally { ++ this.chunkHolderManager.ticketLockArea.unlock(ticketLock); ++ } ++ ++ if (!scheduled) { ++ // couldn't schedule ++ try { ++ loadCallback.accept(chunk); ++ } catch (final ThreadDeath thr) { ++ throw thr; ++ } catch (final Throwable thr) { ++ LOGGER.error("Failed to process chunk full status callback", thr); ++ } ++ } ++ } ++ ++ public void scheduleChunkLoad(final int chunkX, final int chunkZ, final boolean gen, final ChunkStatus toStatus, final boolean addTicket, ++ final PrioritisedExecutor.Priority priority, final Consumer<ChunkAccess> onComplete) { ++ if (gen) { ++ this.scheduleChunkLoad(chunkX, chunkZ, toStatus, addTicket, priority, onComplete); ++ return; ++ } ++ this.scheduleChunkLoad(chunkX, chunkZ, ChunkStatus.EMPTY, addTicket, priority, (final ChunkAccess chunk) -> { ++ if (chunk == null) { ++ onComplete.accept(null); ++ } else { ++ if (chunk.getStatus().isOrAfter(toStatus)) { ++ this.scheduleChunkLoad(chunkX, chunkZ, toStatus, addTicket, priority, onComplete); ++ } else { ++ onComplete.accept(null); ++ } ++ } ++ }); ++ } ++ ++ // only appropriate to use with ServerLevel#syncLoadNonFull ++ public boolean beginChunkLoadForNonFullSync(final int chunkX, final int chunkZ, final ChunkStatus toStatus, ++ final PrioritisedExecutor.Priority priority) { ++ final int accessRadius = getAccessRadius(toStatus); ++ final long chunkKey = CoordinateUtils.getChunkKey(chunkX, chunkZ); ++ final int minLevel = 33 + ChunkStatus.getDistance(toStatus); ++ final List<ChunkProgressionTask> tasks = new ArrayList<>(); ++ final ca.spottedleaf.concurrentutil.lock.ReentrantAreaLock.Node ticketLock = this.chunkHolderManager.ticketLockArea.lock(chunkX, chunkZ, accessRadius); // Folia - use area based lock to reduce contention ++ try { ++ final ca.spottedleaf.concurrentutil.lock.ReentrantAreaLock.Node schedulingLock = this.schedulingLockArea.lock(chunkX, chunkZ, accessRadius); // Folia - use area based lock to reduce contention ++ try { ++ final NewChunkHolder chunkHolder = this.chunkHolderManager.getChunkHolder(chunkKey); ++ if (chunkHolder == null || chunkHolder.getTicketLevel() > minLevel) { ++ return false; ++ } else { ++ final ChunkStatus genStatus = chunkHolder.getCurrentGenStatus(); ++ if (genStatus != null && genStatus.isOrAfter(toStatus)) { ++ return true; ++ } else { ++ chunkHolder.raisePriority(priority); ++ ++ if (!chunkHolder.upgradeGenTarget(toStatus)) { ++ this.schedule(chunkX, chunkZ, toStatus, chunkHolder, tasks); ++ } ++ } ++ } ++ } finally { ++ this.schedulingLockArea.unlock(schedulingLock); ++ } ++ } finally { ++ this.chunkHolderManager.ticketLockArea.unlock(ticketLock); ++ } ++ ++ for (int i = 0, len = tasks.size(); i < len; ++i) { ++ tasks.get(i).schedule(); ++ } ++ ++ return true; ++ } ++ ++ public void scheduleChunkLoad(final int chunkX, final int chunkZ, final ChunkStatus toStatus, final boolean addTicket, ++ final PrioritisedExecutor.Priority priority, final Consumer<ChunkAccess> onComplete) { ++ if (!TickThread.isTickThread()) { ++ this.scheduleChunkTask(chunkX, chunkZ, () -> { ++ ChunkTaskScheduler.this.scheduleChunkLoad(chunkX, chunkZ, toStatus, addTicket, priority, onComplete); ++ }, priority); ++ return; ++ } ++ final int accessRadius = getAccessRadius(toStatus); ++ if (this.chunkHolderManager.ticketLockArea.isHeldByCurrentThread(chunkX, chunkZ, accessRadius)) { ++ throw new IllegalStateException("Cannot schedule chunk load during ticket level update"); ++ } ++ if (this.schedulingLockArea.isHeldByCurrentThread(chunkX, chunkZ, accessRadius)) { ++ throw new IllegalStateException("Cannot schedule chunk loading recursively"); ++ } ++ ++ if (toStatus == ChunkStatus.FULL) { ++ this.scheduleTickingState(chunkX, chunkZ, FullChunkStatus.FULL, addTicket, priority, (Consumer)onComplete); ++ return; ++ } ++ ++ final int minLevel = 33 + ChunkStatus.getDistance(toStatus); ++ final Long chunkReference = addTicket ? Long.valueOf(this.chunkLoadCounter.getAndIncrement()) : null; ++ final long chunkKey = CoordinateUtils.getChunkKey(chunkX, chunkZ); ++ ++ if (addTicket) { ++ this.chunkHolderManager.addTicketAtLevel(TicketType.CHUNK_LOAD, chunkKey, minLevel, chunkReference); ++ this.chunkHolderManager.processTicketUpdates(); ++ } ++ ++ final Consumer<ChunkAccess> loadCallback = (final ChunkAccess chunk) -> { ++ try { ++ if (onComplete != null) { ++ onComplete.accept(chunk); ++ } ++ } finally { ++ if (addTicket) { ++ ChunkTaskScheduler.this.chunkHolderManager.addAndRemoveTickets(chunkKey, ++ TicketType.UNKNOWN, minLevel, new ChunkPos(chunkKey), ++ TicketType.CHUNK_LOAD, minLevel, chunkReference ++ ); ++ } ++ } ++ }; ++ ++ final List<ChunkProgressionTask> tasks = new ArrayList<>(); ++ ++ final boolean scheduled; ++ final ChunkAccess chunk; ++ final ReentrantAreaLock.Node ticketLock = this.chunkHolderManager.ticketLockArea.lock(chunkX, chunkZ, accessRadius); ++ try { ++ final ReentrantAreaLock.Node schedulingLock = this.schedulingLockArea.lock(chunkX, chunkZ, accessRadius); ++ try { ++ final NewChunkHolder chunkHolder = this.chunkHolderManager.getChunkHolder(chunkKey); ++ if (chunkHolder == null || chunkHolder.getTicketLevel() > minLevel) { ++ scheduled = false; ++ chunk = null; ++ } else { ++ final ChunkStatus genStatus = chunkHolder.getCurrentGenStatus(); ++ if (genStatus != null && genStatus.isOrAfter(toStatus)) { ++ scheduled = false; ++ chunk = chunkHolder.getCurrentChunk(); ++ } else { ++ scheduled = true; ++ chunk = null; ++ chunkHolder.raisePriority(priority); ++ ++ if (!chunkHolder.upgradeGenTarget(toStatus)) { ++ this.schedule(chunkX, chunkZ, toStatus, chunkHolder, tasks); ++ } ++ chunkHolder.addStatusConsumer(toStatus, loadCallback); ++ } ++ } ++ } finally { ++ this.schedulingLockArea.unlock(schedulingLock); ++ } ++ } finally { ++ this.chunkHolderManager.ticketLockArea.unlock(ticketLock); ++ } ++ ++ for (int i = 0, len = tasks.size(); i < len; ++i) { ++ tasks.get(i).schedule(); ++ } ++ ++ if (!scheduled) { ++ // couldn't schedule ++ try { ++ loadCallback.accept(chunk); ++ } catch (final ThreadDeath thr) { ++ throw thr; ++ } catch (final Throwable thr) { ++ LOGGER.error("Failed to process chunk status callback", thr); ++ } ++ } ++ } ++ ++ private ChunkProgressionTask createTask(final int chunkX, final int chunkZ, final ChunkAccess chunk, ++ final NewChunkHolder chunkHolder, final List<ChunkAccess> neighbours, ++ final ChunkStatus toStatus, final PrioritisedExecutor.Priority initialPriority) { ++ if (toStatus == ChunkStatus.EMPTY) { ++ return new ChunkLoadTask(this, this.world, chunkX, chunkZ, chunkHolder, initialPriority); ++ } ++ if (toStatus == ChunkStatus.LIGHT) { ++ return new ChunkLightTask(this, this.world, chunkX, chunkZ, chunk, initialPriority); ++ } ++ if (toStatus == ChunkStatus.FULL) { ++ return new ChunkFullTask(this, this.world, chunkX, chunkZ, chunkHolder, chunk, initialPriority); ++ } ++ ++ return new ChunkUpgradeGenericStatusTask(this, this.world, chunkX, chunkZ, chunk, neighbours, toStatus, initialPriority); ++ } ++ ++ ChunkProgressionTask schedule(final int chunkX, final int chunkZ, final ChunkStatus targetStatus, final NewChunkHolder chunkHolder, ++ final List<ChunkProgressionTask> allTasks) { ++ return this.schedule(chunkX, chunkZ, targetStatus, chunkHolder, allTasks, chunkHolder.getEffectivePriority()); ++ } ++ ++ // rets new task scheduled for the _specified_ chunk ++ // note: this must hold the scheduling lock ++ // minPriority is only used to pass the priority through to neighbours, as priority calculation has not yet been done ++ // schedule will ignore the generation target, so it should be checked by the caller to ensure the target is not regressed! ++ private ChunkProgressionTask schedule(final int chunkX, final int chunkZ, final ChunkStatus targetStatus, ++ final NewChunkHolder chunkHolder, final List<ChunkProgressionTask> allTasks, ++ final PrioritisedExecutor.Priority minPriority) { ++ if (!this.schedulingLockArea.isHeldByCurrentThread(chunkX, chunkZ, getAccessRadius(targetStatus))) { ++ throw new IllegalStateException("Not holding scheduling lock"); ++ } ++ ++ if (chunkHolder.hasGenerationTask()) { ++ chunkHolder.upgradeGenTarget(targetStatus); ++ return null; ++ } ++ ++ final PrioritisedExecutor.Priority requestedPriority = PrioritisedExecutor.Priority.max(minPriority, chunkHolder.getEffectivePriority()); ++ final ChunkStatus currentGenStatus = chunkHolder.getCurrentGenStatus(); ++ final ChunkAccess chunk = chunkHolder.getCurrentChunk(); ++ ++ if (currentGenStatus == null) { ++ // not yet loaded ++ final ChunkProgressionTask task = this.createTask( ++ chunkX, chunkZ, chunk, chunkHolder, Collections.emptyList(), ChunkStatus.EMPTY, requestedPriority ++ ); ++ ++ allTasks.add(task); ++ ++ final List<NewChunkHolder> chunkHolderNeighbours = new ArrayList<>(1); ++ chunkHolderNeighbours.add(chunkHolder); ++ ++ chunkHolder.setGenerationTarget(targetStatus); ++ chunkHolder.setGenerationTask(task, ChunkStatus.EMPTY, chunkHolderNeighbours); ++ ++ return task; ++ } ++ ++ if (currentGenStatus.isOrAfter(targetStatus)) { ++ // nothing to do ++ return null; ++ } ++ ++ // we know for sure now that we want to schedule _something_, so set the target ++ chunkHolder.setGenerationTarget(targetStatus); ++ ++ final ChunkStatus chunkRealStatus = chunk.getStatus(); ++ final ChunkStatus toStatus = currentGenStatus.getNextStatus(); ++ ++ // if this chunk has already generated up to or past the specified status, then we don't ++ // need the neighbours AT ALL. ++ final int neighbourReadRadius = chunkRealStatus.isOrAfter(toStatus) ? toStatus.loadRange : toStatus.getRange(); ++ ++ boolean unGeneratedNeighbours = false; ++ ++ // copied from MCUtil.getSpiralOutChunks ++ for (int r = 1; r <= neighbourReadRadius; r++) { ++ int x = -r; ++ int z = r; ++ ++ // Iterates the edge of half of the box; then negates for other half. ++ while (x <= r && z > -r) { ++ final int radius = Math.max(Math.abs(x), Math.abs(z)); ++ final ChunkStatus requiredNeighbourStatus = ChunkMap.getDependencyStatus(toStatus, radius); ++ ++ unGeneratedNeighbours |= this.checkNeighbour( ++ chunkX + x, chunkZ + z, requiredNeighbourStatus, chunkHolder, allTasks, requestedPriority ++ ); ++ unGeneratedNeighbours |= this.checkNeighbour( ++ chunkX - x, chunkZ - z, requiredNeighbourStatus, chunkHolder, allTasks, requestedPriority ++ ); ++ ++ if (x < r) { ++ x++; ++ } else { ++ z--; ++ } ++ } ++ } ++ ++ if (unGeneratedNeighbours) { ++ // can't schedule, but neighbour completion will schedule for us when they're ALL done ++ ++ // propagate our priority to neighbours ++ chunkHolder.recalculateNeighbourPriorities(); ++ return null; ++ } ++ ++ // need to gather neighbours ++ ++ final List<ChunkAccess> neighbours; ++ final List<NewChunkHolder> chunkHolderNeighbours; ++ if (neighbourReadRadius <= 0) { ++ neighbours = new ArrayList<>(1); ++ chunkHolderNeighbours = new ArrayList<>(1); ++ neighbours.add(chunk); ++ chunkHolderNeighbours.add(chunkHolder); ++ } else { ++ // the iteration order is _very_ important, as all generation statuses expect a certain order such that: ++ // chunkAtRelative = neighbours.get(relX + relZ * (2 * radius + 1)) ++ neighbours = new ArrayList<>((2 * neighbourReadRadius + 1) * (2 * neighbourReadRadius + 1)); ++ chunkHolderNeighbours = new ArrayList<>((2 * neighbourReadRadius + 1) * (2 * neighbourReadRadius + 1)); ++ for (int dz = -neighbourReadRadius; dz <= neighbourReadRadius; ++dz) { ++ for (int dx = -neighbourReadRadius; dx <= neighbourReadRadius; ++dx) { ++ final NewChunkHolder holder = (dx | dz) == 0 ? chunkHolder : this.chunkHolderManager.getChunkHolder(dx + chunkX, dz + chunkZ); ++ neighbours.add(holder.getChunkForNeighbourAccess()); ++ chunkHolderNeighbours.add(holder); ++ } ++ } ++ } ++ ++ final ChunkProgressionTask task = this.createTask(chunkX, chunkZ, chunk, chunkHolder, neighbours, toStatus, chunkHolder.getEffectivePriority()); ++ allTasks.add(task); ++ ++ chunkHolder.setGenerationTask(task, toStatus, chunkHolderNeighbours); ++ ++ return task; ++ } ++ ++ // rets true if the neighbour is not at the required status, false otherwise ++ private boolean checkNeighbour(final int chunkX, final int chunkZ, final ChunkStatus requiredStatus, final NewChunkHolder center, ++ final List<ChunkProgressionTask> tasks, final PrioritisedExecutor.Priority minPriority) { ++ final NewChunkHolder chunkHolder = this.chunkHolderManager.getChunkHolder(chunkX, chunkZ); ++ ++ if (chunkHolder == null) { ++ throw new IllegalStateException("Missing chunkholder when required"); ++ } ++ ++ final ChunkStatus holderStatus = chunkHolder.getCurrentGenStatus(); ++ if (holderStatus != null && holderStatus.isOrAfter(requiredStatus)) { ++ return false; ++ } ++ ++ if (chunkHolder.hasFailedGeneration()) { ++ return true; ++ } ++ ++ center.addGenerationBlockingNeighbour(chunkHolder); ++ chunkHolder.addWaitingNeighbour(center, requiredStatus); ++ ++ if (chunkHolder.upgradeGenTarget(requiredStatus)) { ++ return true; ++ } ++ ++ // not at status required, so we need to schedule its generation ++ this.schedule( ++ chunkX, chunkZ, requiredStatus, chunkHolder, tasks, minPriority ++ ); ++ ++ return true; ++ } ++ ++ /** ++ * @deprecated Chunk tasks must be tied to coordinates in the future ++ */ ++ @Deprecated ++ public PrioritisedExecutor.PrioritisedTask scheduleChunkTask(final Runnable run) { ++ return this.scheduleChunkTask(run, PrioritisedExecutor.Priority.NORMAL); ++ } ++ ++ /** ++ * @deprecated Chunk tasks must be tied to coordinates in the future ++ */ ++ @Deprecated ++ public PrioritisedExecutor.PrioritisedTask scheduleChunkTask(final Runnable run, final PrioritisedExecutor.Priority priority) { ++ return this.mainThreadExecutor.queueRunnable(run, priority); ++ } ++ ++ public PrioritisedExecutor.PrioritisedTask createChunkTask(final int chunkX, final int chunkZ, final Runnable run) { ++ return this.createChunkTask(chunkX, chunkZ, run, PrioritisedExecutor.Priority.NORMAL); ++ } ++ ++ public PrioritisedExecutor.PrioritisedTask createChunkTask(final int chunkX, final int chunkZ, final Runnable run, ++ final PrioritisedExecutor.Priority priority) { ++ return this.mainThreadExecutor.createTask(run, priority); ++ } ++ ++ public PrioritisedExecutor.PrioritisedTask scheduleChunkTask(final int chunkX, final int chunkZ, final Runnable run) { ++ return this.mainThreadExecutor.queueRunnable(run); ++ } ++ ++ public PrioritisedExecutor.PrioritisedTask scheduleChunkTask(final int chunkX, final int chunkZ, final Runnable run, ++ final PrioritisedExecutor.Priority priority) { ++ return this.mainThreadExecutor.queueRunnable(run, priority); ++ } ++ ++ public void executeTasksUntil(final BooleanSupplier exit) { ++ if (Bukkit.isPrimaryThread()) { ++ this.mainThreadExecutor.executeConditionally(exit); ++ } else { ++ long counter = 1L; ++ while (!exit.getAsBoolean()) { ++ counter = ConcurrentUtil.linearLongBackoff(counter, 100_000L, 5_000_000L); // 100us, 5ms ++ } ++ } ++ } ++ ++ public boolean halt(final boolean sync, final long maxWaitNS) { ++ this.radiusAwareGenExecutor.halt(); ++ this.parallelGenExecutor.halt(); ++ this.loadExecutor.halt(); ++ final long time = System.nanoTime(); ++ if (sync) { ++ for (long failures = 9L;; failures = ConcurrentUtil.linearLongBackoff(failures, 500_000L, 50_000_000L)) { ++ if ( ++ !this.radiusAwareGenExecutor.isActive() && ++ !this.parallelGenExecutor.isActive() && ++ !this.loadExecutor.isActive() ++ ) { ++ return true; ++ } ++ if ((System.nanoTime() - time) >= maxWaitNS) { ++ return false; ++ } ++ } ++ } ++ ++ return true; ++ } ++ ++ public static final ArrayDeque<ChunkInfo> WAITING_CHUNKS = new ArrayDeque<>(); // stack ++ ++ public static final class ChunkInfo { ++ ++ public final int chunkX; ++ public final int chunkZ; ++ public final ServerLevel world; ++ ++ public ChunkInfo(final int chunkX, final int chunkZ, final ServerLevel world) { ++ this.chunkX = chunkX; ++ this.chunkZ = chunkZ; ++ this.world = world; ++ } ++ ++ @Override ++ public String toString() { ++ return "[( " + this.chunkX + "," + this.chunkZ + ") in '" + this.world.getWorld().getName() + "']"; ++ } ++ } ++ ++ public static void pushChunkWait(final ServerLevel world, final int chunkX, final int chunkZ) { ++ synchronized (WAITING_CHUNKS) { ++ WAITING_CHUNKS.push(new ChunkInfo(chunkX, chunkZ, world)); ++ } ++ } ++ ++ public static void popChunkWait() { ++ synchronized (WAITING_CHUNKS) { ++ WAITING_CHUNKS.pop(); ++ } ++ } ++ ++ public static ChunkInfo[] getChunkInfos() { ++ synchronized (WAITING_CHUNKS) { ++ return WAITING_CHUNKS.toArray(new ChunkInfo[0]); ++ } ++ } ++ ++ public static void dumpAllChunkLoadInfo(final boolean longPrint) { ++ final ChunkInfo[] chunkInfos = getChunkInfos(); ++ if (chunkInfos.length > 0) { ++ LOGGER.error("Chunk wait task info below: "); ++ for (final ChunkInfo chunkInfo : chunkInfos) { ++ final NewChunkHolder holder = chunkInfo.world.chunkTaskScheduler.chunkHolderManager.getChunkHolder(chunkInfo.chunkX, chunkInfo.chunkZ); ++ LOGGER.error("Chunk wait: " + chunkInfo); ++ LOGGER.error("Chunk holder: " + holder); ++ } ++ ++ if (longPrint) { ++ final File file = new File(new File(new File("."), "debug"), "chunks-watchdog.txt"); ++ LOGGER.error("Writing chunk information dump to " + file); ++ try { ++ MCUtil.dumpChunks(file, true); ++ LOGGER.error("Successfully written chunk information!"); ++ } catch (final Throwable thr) { ++ MinecraftServer.LOGGER.warn("Failed to dump chunk information to file " + file.toString(), thr); ++ } ++ } ++ } ++ } ++} +diff --git a/src/main/java/io/papermc/paper/chunk/system/scheduling/ChunkUpgradeGenericStatusTask.java b/src/main/java/io/papermc/paper/chunk/system/scheduling/ChunkUpgradeGenericStatusTask.java +new file mode 100644 +index 0000000000000000000000000000000000000000..bd0d0c4436f357392e13d9efd4412886385a6924 +--- /dev/null ++++ b/src/main/java/io/papermc/paper/chunk/system/scheduling/ChunkUpgradeGenericStatusTask.java +@@ -0,0 +1,214 @@ ++package io.papermc.paper.chunk.system.scheduling; ++ ++import ca.spottedleaf.concurrentutil.executor.standard.PrioritisedExecutor; ++import ca.spottedleaf.concurrentutil.util.ConcurrentUtil; ++import com.mojang.logging.LogUtils; ++import net.minecraft.server.level.ChunkMap; ++import net.minecraft.server.level.ChunkResult; ++import net.minecraft.server.level.ServerChunkCache; ++import net.minecraft.server.level.ServerLevel; ++import net.minecraft.world.level.chunk.ChunkAccess; ++import net.minecraft.world.level.chunk.status.ChunkStatus; ++import net.minecraft.world.level.chunk.ProtoChunk; ++import net.minecraft.world.level.chunk.status.WorldGenContext; ++import org.slf4j.Logger; ++import java.lang.invoke.VarHandle; ++import java.util.List; ++import java.util.Map; ++import java.util.concurrent.CompletableFuture; ++ ++public final class ChunkUpgradeGenericStatusTask extends ChunkProgressionTask implements Runnable { ++ ++ private static final Logger LOGGER = LogUtils.getClassLogger(); ++ ++ protected final ChunkAccess fromChunk; ++ protected final ChunkStatus fromStatus; ++ protected final ChunkStatus toStatus; ++ protected final List<ChunkAccess> neighbours; ++ ++ protected final PrioritisedExecutor.PrioritisedTask generateTask; ++ ++ public ChunkUpgradeGenericStatusTask(final ChunkTaskScheduler scheduler, final ServerLevel world, final int chunkX, ++ final int chunkZ, final ChunkAccess chunk, final List<ChunkAccess> neighbours, ++ final ChunkStatus toStatus, final PrioritisedExecutor.Priority priority) { ++ super(scheduler, world, chunkX, chunkZ); ++ if (!PrioritisedExecutor.Priority.isValidPriority(priority)) { ++ throw new IllegalArgumentException("Invalid priority " + priority); ++ } ++ this.fromChunk = chunk; ++ this.fromStatus = chunk.getStatus(); ++ this.toStatus = toStatus; ++ this.neighbours = neighbours; ++ if (this.toStatus.isParallelCapable) { ++ this.generateTask = this.scheduler.parallelGenExecutor.createTask(this, priority); ++ } else { ++ this.generateTask = this.scheduler.radiusAwareScheduler.createTask(chunkX, chunkZ, this.toStatus.writeRadius, this, priority); ++ } ++ } ++ ++ @Override ++ public ChunkStatus getTargetStatus() { ++ return this.toStatus; ++ } ++ ++ private boolean isEmptyTask() { ++ // must use fromStatus here to avoid any race condition with run() overwriting the status ++ final boolean generation = !this.fromStatus.isOrAfter(this.toStatus); ++ return (generation && this.toStatus.isEmptyGenStatus()) || (!generation && this.toStatus.isEmptyLoadStatus()); ++ } ++ ++ @Override ++ public void run() { ++ final ChunkAccess chunk = this.fromChunk; ++ ++ final ServerChunkCache serverChunkCache = this.world.chunkSource; ++ final ChunkMap chunkMap = serverChunkCache.chunkMap; ++ ++ final CompletableFuture<ChunkAccess> completeFuture; ++ ++ final boolean generation; ++ boolean completing = false; ++ ++ // note: should optimise the case where the chunk does not need to execute the status, because ++ // schedule() calls this synchronously if it will run through that path ++ ++ final WorldGenContext ctx = new WorldGenContext( ++ this.world, ++ chunkMap.generator, ++ chunkMap.getWorldGenContext().structureManager(), ++ serverChunkCache.getLightEngine() ++ ); ++ try { ++ generation = !chunk.getStatus().isOrAfter(this.toStatus); ++ if (generation) { ++ if (this.toStatus.isEmptyGenStatus()) { ++ if (chunk instanceof ProtoChunk) { ++ ((ProtoChunk)chunk).setStatus(this.toStatus); ++ } ++ completing = true; ++ this.complete(chunk, null); ++ return; ++ } ++ completeFuture = this.toStatus.generate(ctx, Runnable::run, null, this.neighbours) ++ .whenComplete((final ChunkAccess either, final Throwable throwable) -> { ++ if (either instanceof ProtoChunk proto) { ++ proto.setStatus(ChunkUpgradeGenericStatusTask.this.toStatus); ++ } ++ } ++ ); ++ } else { ++ if (this.toStatus.isEmptyLoadStatus()) { ++ completing = true; ++ this.complete(chunk, null); ++ return; ++ } ++ completeFuture = this.toStatus.load(ctx, null, chunk); ++ } ++ } catch (final Throwable throwable) { ++ if (!completing) { ++ this.complete(null, throwable); ++ ++ if (throwable instanceof ThreadDeath) { ++ throw (ThreadDeath)throwable; ++ } ++ return; ++ } ++ ++ this.scheduler.unrecoverableChunkSystemFailure(this.chunkX, this.chunkZ, Map.of( ++ "Target status", ChunkTaskScheduler.stringIfNull(this.toStatus), ++ "From status", ChunkTaskScheduler.stringIfNull(this.fromStatus), ++ "Generation task", this ++ ), throwable); ++ ++ if (!(throwable instanceof ThreadDeath)) { ++ LOGGER.error("Failed to complete status for chunk: status:" + this.toStatus + ", chunk: (" + this.chunkX + "," + this.chunkZ + "), world: " + this.world.getWorld().getName(), throwable); ++ } else { ++ // ensure the chunk system can respond, then die ++ throw (ThreadDeath)throwable; ++ } ++ return; ++ } ++ ++ if (!completeFuture.isDone() && !this.toStatus.warnedAboutNoImmediateComplete.getAndSet(true)) { ++ LOGGER.warn("Future status not complete after scheduling: " + this.toStatus.toString() + ", generate: " + generation); ++ } ++ ++ final ChunkAccess newChunk; ++ ++ try { ++ newChunk = completeFuture.join(); ++ } catch (final Throwable throwable) { ++ this.complete(null, throwable); ++ // ensure the chunk system can respond, then die ++ if (throwable instanceof ThreadDeath) { ++ throw (ThreadDeath)throwable; ++ } ++ return; ++ } ++ ++ if (newChunk == null) { ++ this.complete(null, new IllegalStateException("Chunk for status: " + ChunkUpgradeGenericStatusTask.this.toStatus.toString() + ", generation: " + generation + " should not be null! Future: " + completeFuture).fillInStackTrace()); ++ return; ++ } ++ ++ this.complete(newChunk, null); ++ } ++ ++ protected volatile boolean scheduled; ++ protected static final VarHandle SCHEDULED_HANDLE = ConcurrentUtil.getVarHandle(ChunkUpgradeGenericStatusTask.class, "scheduled", boolean.class); ++ ++ @Override ++ public boolean isScheduled() { ++ return this.scheduled; ++ } ++ ++ @Override ++ public void schedule() { ++ if ((boolean)SCHEDULED_HANDLE.getAndSet((ChunkUpgradeGenericStatusTask)this, true)) { ++ throw new IllegalStateException("Cannot double call schedule()"); ++ } ++ if (this.isEmptyTask()) { ++ if (this.generateTask.cancel()) { ++ this.run(); ++ } ++ } else { ++ this.generateTask.queue(); ++ } ++ } ++ ++ @Override ++ public void cancel() { ++ if (this.generateTask.cancel()) { ++ this.complete(null, null); ++ } ++ } ++ ++ @Override ++ public PrioritisedExecutor.Priority getPriority() { ++ return this.generateTask.getPriority(); ++ } ++ ++ @Override ++ public void lowerPriority(final PrioritisedExecutor.Priority priority) { ++ if (!PrioritisedExecutor.Priority.isValidPriority(priority)) { ++ throw new IllegalArgumentException("Invalid priority " + priority); ++ } ++ this.generateTask.lowerPriority(priority); ++ } ++ ++ @Override ++ public void setPriority(final PrioritisedExecutor.Priority priority) { ++ if (!PrioritisedExecutor.Priority.isValidPriority(priority)) { ++ throw new IllegalArgumentException("Invalid priority " + priority); ++ } ++ this.generateTask.setPriority(priority); ++ } ++ ++ @Override ++ public void raisePriority(final PrioritisedExecutor.Priority priority) { ++ if (!PrioritisedExecutor.Priority.isValidPriority(priority)) { ++ throw new IllegalArgumentException("Invalid priority " + priority); ++ } ++ this.generateTask.raisePriority(priority); ++ } ++} +diff --git a/src/main/java/io/papermc/paper/chunk/system/scheduling/GenericDataLoadTask.java b/src/main/java/io/papermc/paper/chunk/system/scheduling/GenericDataLoadTask.java +new file mode 100644 +index 0000000000000000000000000000000000000000..396d72c00e47cf1669ae20dc839c1c961b1f262a +--- /dev/null ++++ b/src/main/java/io/papermc/paper/chunk/system/scheduling/GenericDataLoadTask.java +@@ -0,0 +1,746 @@ ++package io.papermc.paper.chunk.system.scheduling; ++ ++import ca.spottedleaf.concurrentutil.completable.Completable; ++import ca.spottedleaf.concurrentutil.executor.Cancellable; ++import ca.spottedleaf.concurrentutil.executor.standard.DelayedPrioritisedTask; ++import ca.spottedleaf.concurrentutil.executor.standard.PrioritisedExecutor; ++import ca.spottedleaf.concurrentutil.util.ConcurrentUtil; ++import com.mojang.logging.LogUtils; ++import io.papermc.paper.chunk.system.io.RegionFileIOThread; ++import net.minecraft.nbt.CompoundTag; ++import net.minecraft.server.level.ServerLevel; ++import org.slf4j.Logger; ++import java.lang.invoke.VarHandle; ++import java.util.Map; ++import java.util.concurrent.atomic.AtomicBoolean; ++import java.util.concurrent.atomic.AtomicLong; ++import java.util.function.BiConsumer; ++ ++public abstract class GenericDataLoadTask<OnMain,FinalCompletion> { ++ ++ private static final Logger LOGGER = LogUtils.getClassLogger(); ++ ++ protected static final CompoundTag CANCELLED_DATA = new CompoundTag(); ++ ++ // reference count is the upper 32 bits ++ protected final AtomicLong stageAndReferenceCount = new AtomicLong(STAGE_NOT_STARTED); ++ ++ protected static final long STAGE_MASK = 0xFFFFFFFFL; ++ protected static final long STAGE_CANCELLED = 0xFFFFFFFFL; ++ protected static final long STAGE_NOT_STARTED = 0L; ++ protected static final long STAGE_LOADING = 1L; ++ protected static final long STAGE_PROCESSING = 2L; ++ protected static final long STAGE_COMPLETED = 3L; ++ ++ // for loading data off disk ++ protected final LoadDataFromDiskTask loadDataFromDiskTask; ++ // processing off-main ++ protected final PrioritisedExecutor.PrioritisedTask processOffMain; ++ // processing on-main ++ protected final PrioritisedExecutor.PrioritisedTask processOnMain; ++ ++ protected final ChunkTaskScheduler scheduler; ++ protected final ServerLevel world; ++ protected final int chunkX; ++ protected final int chunkZ; ++ protected final RegionFileIOThread.RegionFileType type; ++ ++ public GenericDataLoadTask(final ChunkTaskScheduler scheduler, final ServerLevel world, final int chunkX, ++ final int chunkZ, final RegionFileIOThread.RegionFileType type, ++ final PrioritisedExecutor.Priority priority) { ++ this.scheduler = scheduler; ++ this.world = world; ++ this.chunkX = chunkX; ++ this.chunkZ = chunkZ; ++ this.type = type; ++ ++ final ProcessOnMainTask mainTask; ++ if (this.hasOnMain()) { ++ mainTask = new ProcessOnMainTask(); ++ this.processOnMain = this.createOnMain(mainTask, priority); ++ } else { ++ mainTask = null; ++ this.processOnMain = null; ++ } ++ ++ final ProcessOffMainTask offMainTask; ++ if (this.hasOffMain()) { ++ offMainTask = new ProcessOffMainTask(mainTask); ++ this.processOffMain = this.createOffMain(offMainTask, priority); ++ } else { ++ offMainTask = null; ++ this.processOffMain = null; ++ } ++ ++ if (this.processOffMain == null && this.processOnMain == null) { ++ throw new IllegalStateException("Illegal class implementation: " + this.getClass().getName() + ", should be able to schedule at least one task!"); ++ } ++ ++ this.loadDataFromDiskTask = new LoadDataFromDiskTask(world, chunkX, chunkZ, type, new DataLoadCallback(offMainTask, mainTask), priority); ++ } ++ ++ public static final record TaskResult<L, R>(L left, R right) {} ++ ++ protected abstract boolean hasOffMain(); ++ ++ protected abstract boolean hasOnMain(); ++ ++ protected abstract PrioritisedExecutor.PrioritisedTask createOffMain(final Runnable run, final PrioritisedExecutor.Priority priority); ++ ++ protected abstract PrioritisedExecutor.PrioritisedTask createOnMain(final Runnable run, final PrioritisedExecutor.Priority priority); ++ ++ protected abstract TaskResult<OnMain, Throwable> runOffMain(final CompoundTag data, final Throwable throwable); ++ ++ protected abstract TaskResult<FinalCompletion, Throwable> runOnMain(final OnMain data, final Throwable throwable); ++ ++ protected abstract void onComplete(final TaskResult<FinalCompletion,Throwable> result); ++ ++ protected abstract TaskResult<FinalCompletion, Throwable> completeOnMainOffMain(final OnMain data, final Throwable throwable); ++ ++ @Override ++ public String toString() { ++ return "GenericDataLoadTask{class: " + this.getClass().getName() + ", world: " + this.world.getWorld().getName() + ++ ", chunk: (" + this.chunkX + "," + this.chunkZ + "), hashcode: " + System.identityHashCode(this) + ", priority: " + this.getPriority() + ++ ", type: " + this.type.toString() + "}"; ++ } ++ ++ public PrioritisedExecutor.Priority getPriority() { ++ if (this.processOnMain != null) { ++ return this.processOnMain.getPriority(); ++ } else { ++ return this.processOffMain.getPriority(); ++ } ++ } ++ ++ public void lowerPriority(final PrioritisedExecutor.Priority priority) { ++ // can't lower I/O tasks, we don't know what they affect ++ if (this.processOffMain != null) { ++ this.processOffMain.lowerPriority(priority); ++ } ++ if (this.processOnMain != null) { ++ this.processOnMain.lowerPriority(priority); ++ } ++ } ++ ++ public void setPriority(final PrioritisedExecutor.Priority priority) { ++ // can't lower I/O tasks, we don't know what they affect ++ this.loadDataFromDiskTask.raisePriority(priority); ++ if (this.processOffMain != null) { ++ this.processOffMain.setPriority(priority); ++ } ++ if (this.processOnMain != null) { ++ this.processOnMain.setPriority(priority); ++ } ++ } ++ ++ public void raisePriority(final PrioritisedExecutor.Priority priority) { ++ // can't lower I/O tasks, we don't know what they affect ++ this.loadDataFromDiskTask.raisePriority(priority); ++ if (this.processOffMain != null) { ++ this.processOffMain.raisePriority(priority); ++ } ++ if (this.processOnMain != null) { ++ this.processOnMain.raisePriority(priority); ++ } ++ } ++ ++ // returns whether scheduleNow() needs to be called ++ public boolean schedule(final boolean delay) { ++ if (this.stageAndReferenceCount.get() != STAGE_NOT_STARTED || ++ !this.stageAndReferenceCount.compareAndSet(STAGE_NOT_STARTED, (1L << 32) | STAGE_LOADING)) { ++ // try and increment reference count ++ int failures = 0; ++ for (long curr = this.stageAndReferenceCount.get();;) { ++ if ((curr & STAGE_MASK) == STAGE_CANCELLED || (curr & STAGE_MASK) == STAGE_COMPLETED) { ++ // cancelled or completed, nothing to do here ++ return false; ++ } ++ ++ if (curr == (curr = this.stageAndReferenceCount.compareAndExchange(curr, curr + (1L << 32)))) { ++ // successful ++ return false; ++ } ++ ++ ++failures; ++ for (int i = 0; i < failures; ++i) { ++ ConcurrentUtil.backoff(); ++ } ++ } ++ } ++ ++ if (!delay) { ++ this.scheduleNow(); ++ return false; ++ } ++ return true; ++ } ++ ++ public void scheduleNow() { ++ this.loadDataFromDiskTask.schedule(); // will schedule the rest ++ } ++ ++ // assumes the current stage cannot be completed ++ // returns false if cancelled, returns true if can proceed ++ private boolean advanceStage(final long expect, final long to) { ++ int failures = 0; ++ for (long curr = this.stageAndReferenceCount.get();;) { ++ if ((curr & STAGE_MASK) != expect) { ++ // must be cancelled ++ return false; ++ } ++ ++ final long newVal = (curr & ~STAGE_MASK) | to; ++ if (curr == (curr = this.stageAndReferenceCount.compareAndExchange(curr, newVal))) { ++ return true; ++ } ++ ++ ++failures; ++ for (int i = 0; i < failures; ++i) { ++ ConcurrentUtil.backoff(); ++ } ++ } ++ } ++ ++ public boolean cancel() { ++ int failures = 0; ++ for (long curr = this.stageAndReferenceCount.get();;) { ++ if ((curr & STAGE_MASK) == STAGE_COMPLETED || (curr & STAGE_MASK) == STAGE_CANCELLED) { ++ return false; ++ } ++ ++ if ((curr & STAGE_MASK) == STAGE_NOT_STARTED || (curr & ~STAGE_MASK) == (1L << 32)) { ++ // no other references, so we can cancel ++ final long newVal = STAGE_CANCELLED; ++ if (curr == (curr = this.stageAndReferenceCount.compareAndExchange(curr, newVal))) { ++ this.loadDataFromDiskTask.cancel(); ++ if (this.processOffMain != null) { ++ this.processOffMain.cancel(); ++ } ++ if (this.processOnMain != null) { ++ this.processOnMain.cancel(); ++ } ++ this.onComplete(null); ++ return true; ++ } ++ } else { ++ if ((curr & ~STAGE_MASK) == (0L << 32)) { ++ throw new IllegalStateException("Reference count cannot be zero here"); ++ } ++ // just decrease the reference count ++ final long newVal = curr - (1L << 32); ++ if (curr == (curr = this.stageAndReferenceCount.compareAndExchange(curr, newVal))) { ++ return false; ++ } ++ } ++ ++ ++failures; ++ for (int i = 0; i < failures; ++i) { ++ ConcurrentUtil.backoff(); ++ } ++ } ++ } ++ ++ protected final class DataLoadCallback implements BiConsumer<CompoundTag, Throwable> { ++ ++ protected final ProcessOffMainTask offMainTask; ++ protected final ProcessOnMainTask onMainTask; ++ ++ public DataLoadCallback(final ProcessOffMainTask offMainTask, final ProcessOnMainTask onMainTask) { ++ this.offMainTask = offMainTask; ++ this.onMainTask = onMainTask; ++ } ++ ++ @Override ++ public void accept(final CompoundTag compoundTag, final Throwable throwable) { ++ if (GenericDataLoadTask.this.stageAndReferenceCount.get() == STAGE_CANCELLED) { ++ // don't try to schedule further ++ return; ++ } ++ ++ try { ++ if (compoundTag == CANCELLED_DATA) { ++ // cancelled, except this isn't possible ++ LOGGER.error("Data callback says cancelled, but stage does not?"); ++ return; ++ } ++ ++ // get off of the regionfile callback ASAP, no clue what locks are held right now... ++ if (GenericDataLoadTask.this.processOffMain != null) { ++ this.offMainTask.data = compoundTag; ++ this.offMainTask.throwable = throwable; ++ GenericDataLoadTask.this.processOffMain.queue(); ++ return; ++ } else { ++ // no off-main task, so go straight to main ++ this.onMainTask.data = (OnMain)compoundTag; ++ this.onMainTask.throwable = throwable; ++ GenericDataLoadTask.this.processOnMain.queue(); ++ } ++ } catch (final ThreadDeath death) { ++ throw death; ++ } catch (final Throwable thr2) { ++ LOGGER.error("Failed I/O callback for task: " + GenericDataLoadTask.this.toString(), thr2); ++ GenericDataLoadTask.this.scheduler.unrecoverableChunkSystemFailure( ++ GenericDataLoadTask.this.chunkX, GenericDataLoadTask.this.chunkZ, Map.of( ++ "Callback throwable", ChunkTaskScheduler.stringIfNull(throwable) ++ ), thr2); ++ } ++ } ++ } ++ ++ protected final class ProcessOffMainTask implements Runnable { ++ ++ protected CompoundTag data; ++ protected Throwable throwable; ++ protected final ProcessOnMainTask schedule; ++ ++ public ProcessOffMainTask(final ProcessOnMainTask schedule) { ++ this.schedule = schedule; ++ } ++ ++ @Override ++ public void run() { ++ if (!GenericDataLoadTask.this.advanceStage(STAGE_LOADING, this.schedule == null ? STAGE_COMPLETED : STAGE_PROCESSING)) { ++ // cancelled ++ return; ++ } ++ final TaskResult<OnMain, Throwable> newData = GenericDataLoadTask.this.runOffMain(this.data, this.throwable); ++ ++ if (GenericDataLoadTask.this.stageAndReferenceCount.get() == STAGE_CANCELLED) { ++ // don't try to schedule further ++ return; ++ } ++ ++ if (this.schedule != null) { ++ final TaskResult<FinalCompletion, Throwable> syncComplete = GenericDataLoadTask.this.completeOnMainOffMain(newData.left, newData.right); ++ ++ if (syncComplete != null) { ++ if (GenericDataLoadTask.this.advanceStage(STAGE_PROCESSING, STAGE_COMPLETED)) { ++ GenericDataLoadTask.this.onComplete(syncComplete); ++ } // else: cancelled ++ return; ++ } ++ ++ this.schedule.data = newData.left; ++ this.schedule.throwable = newData.right; ++ ++ GenericDataLoadTask.this.processOnMain.queue(); ++ } else { ++ GenericDataLoadTask.this.onComplete((TaskResult<FinalCompletion, Throwable>)newData); ++ } ++ } ++ } ++ ++ protected final class ProcessOnMainTask implements Runnable { ++ ++ protected OnMain data; ++ protected Throwable throwable; ++ ++ @Override ++ public void run() { ++ if (!GenericDataLoadTask.this.advanceStage(STAGE_PROCESSING, STAGE_COMPLETED)) { ++ // cancelled ++ return; ++ } ++ final TaskResult<FinalCompletion, Throwable> result = GenericDataLoadTask.this.runOnMain(this.data, this.throwable); ++ ++ GenericDataLoadTask.this.onComplete(result); ++ } ++ } ++ ++ public static final class LoadDataFromDiskTask { ++ ++ protected volatile int priority; ++ protected static final VarHandle PRIORITY_HANDLE = ConcurrentUtil.getVarHandle(LoadDataFromDiskTask.class, "priority", int.class); ++ ++ protected static final int PRIORITY_EXECUTED = Integer.MIN_VALUE >>> 0; ++ protected static final int PRIORITY_LOAD_SCHEDULED = Integer.MIN_VALUE >>> 1; ++ protected static final int PRIORITY_UNLOAD_SCHEDULED = Integer.MIN_VALUE >>> 2; ++ ++ protected static final int PRIORITY_FLAGS = ~Character.MAX_VALUE; ++ ++ protected final int getPriorityVolatile() { ++ return (int)PRIORITY_HANDLE.getVolatile((LoadDataFromDiskTask)this); ++ } ++ ++ protected final int compareAndExchangePriorityVolatile(final int expect, final int update) { ++ return (int)PRIORITY_HANDLE.compareAndExchange((LoadDataFromDiskTask)this, (int)expect, (int)update); ++ } ++ ++ protected final int getAndOrPriorityVolatile(final int val) { ++ return (int)PRIORITY_HANDLE.getAndBitwiseOr((LoadDataFromDiskTask)this, (int)val); ++ } ++ ++ protected final void setPriorityPlain(final int val) { ++ PRIORITY_HANDLE.set((LoadDataFromDiskTask)this, (int)val); ++ } ++ ++ private final ServerLevel world; ++ private final int chunkX; ++ private final int chunkZ; ++ ++ private final RegionFileIOThread.RegionFileType type; ++ private Cancellable dataLoadTask; ++ private Cancellable dataUnloadCancellable; ++ private DelayedPrioritisedTask dataUnloadTask; ++ ++ private final BiConsumer<CompoundTag, Throwable> onComplete; ++ ++ // onComplete should be caller sensitive, it may complete synchronously with schedule() - which does ++ // hold a priority lock. ++ public LoadDataFromDiskTask(final ServerLevel world, final int chunkX, final int chunkZ, ++ final RegionFileIOThread.RegionFileType type, ++ final BiConsumer<CompoundTag, Throwable> onComplete, ++ final PrioritisedExecutor.Priority priority) { ++ if (!PrioritisedExecutor.Priority.isValidPriority(priority)) { ++ throw new IllegalArgumentException("Invalid priority " + priority); ++ } ++ this.world = world; ++ this.chunkX = chunkX; ++ this.chunkZ = chunkZ; ++ this.type = type; ++ this.onComplete = onComplete; ++ this.setPriorityPlain(priority.priority); ++ } ++ ++ private void complete(final CompoundTag data, final Throwable throwable) { ++ try { ++ this.onComplete.accept(data, throwable); ++ } catch (final Throwable thr2) { ++ this.world.chunkTaskScheduler.unrecoverableChunkSystemFailure(this.chunkX, this.chunkZ, Map.of( ++ "Completed throwable", ChunkTaskScheduler.stringIfNull(throwable), ++ "Regionfile type", ChunkTaskScheduler.stringIfNull(this.type) ++ ), thr2); ++ if (thr2 instanceof ThreadDeath) { ++ throw (ThreadDeath)thr2; ++ } ++ } ++ } ++ ++ protected boolean markExecuting() { ++ return (this.getAndOrPriorityVolatile(PRIORITY_EXECUTED) & PRIORITY_EXECUTED) == 0; ++ } ++ ++ protected boolean isMarkedExecuted() { ++ return (this.getPriorityVolatile() & PRIORITY_EXECUTED) != 0; ++ } ++ ++ public void lowerPriority(final PrioritisedExecutor.Priority priority) { ++ if (!PrioritisedExecutor.Priority.isValidPriority(priority)) { ++ throw new IllegalArgumentException("Invalid priority " + priority); ++ } ++ ++ int failures = 0; ++ for (int curr = this.getPriorityVolatile();;) { ++ if ((curr & PRIORITY_EXECUTED) != 0) { ++ // cancelled or executed ++ return; ++ } ++ ++ if ((curr & PRIORITY_LOAD_SCHEDULED) != 0) { ++ RegionFileIOThread.lowerPriority(this.world, this.chunkX, this.chunkZ, this.type, priority); ++ return; ++ } ++ ++ if ((curr & PRIORITY_UNLOAD_SCHEDULED) != 0) { ++ if (this.dataUnloadTask != null) { ++ this.dataUnloadTask.lowerPriority(priority); ++ } ++ // no return - we need to propagate priority ++ } ++ ++ if (!priority.isHigherPriority(curr & ~PRIORITY_FLAGS)) { ++ return; ++ } ++ ++ if (curr == (curr = this.compareAndExchangePriorityVolatile(curr, priority.priority | (curr & PRIORITY_FLAGS)))) { ++ return; ++ } ++ ++ // failed, retry ++ ++ ++failures; ++ for (int i = 0; i < failures; ++i) { ++ ConcurrentUtil.backoff(); ++ } ++ } ++ } ++ ++ public void setPriority(final PrioritisedExecutor.Priority priority) { ++ if (!PrioritisedExecutor.Priority.isValidPriority(priority)) { ++ throw new IllegalArgumentException("Invalid priority " + priority); ++ } ++ ++ int failures = 0; ++ for (int curr = this.getPriorityVolatile();;) { ++ if ((curr & PRIORITY_EXECUTED) != 0) { ++ // cancelled or executed ++ return; ++ } ++ ++ if ((curr & PRIORITY_LOAD_SCHEDULED) != 0) { ++ RegionFileIOThread.setPriority(this.world, this.chunkX, this.chunkZ, this.type, priority); ++ return; ++ } ++ ++ if ((curr & PRIORITY_UNLOAD_SCHEDULED) != 0) { ++ if (this.dataUnloadTask != null) { ++ this.dataUnloadTask.setPriority(priority); ++ } ++ // no return - we need to propagate priority ++ } ++ ++ if (curr == (curr = this.compareAndExchangePriorityVolatile(curr, priority.priority | (curr & PRIORITY_FLAGS)))) { ++ return; ++ } ++ ++ // failed, retry ++ ++ ++failures; ++ for (int i = 0; i < failures; ++i) { ++ ConcurrentUtil.backoff(); ++ } ++ } ++ } ++ ++ public void raisePriority(final PrioritisedExecutor.Priority priority) { ++ if (!PrioritisedExecutor.Priority.isValidPriority(priority)) { ++ throw new IllegalArgumentException("Invalid priority " + priority); ++ } ++ ++ int failures = 0; ++ for (int curr = this.getPriorityVolatile();;) { ++ if ((curr & PRIORITY_EXECUTED) != 0) { ++ // cancelled or executed ++ return; ++ } ++ ++ if ((curr & PRIORITY_LOAD_SCHEDULED) != 0) { ++ RegionFileIOThread.raisePriority(this.world, this.chunkX, this.chunkZ, this.type, priority); ++ return; ++ } ++ ++ if ((curr & PRIORITY_UNLOAD_SCHEDULED) != 0) { ++ if (this.dataUnloadTask != null) { ++ this.dataUnloadTask.raisePriority(priority); ++ } ++ // no return - we need to propagate priority ++ } ++ ++ if (!priority.isLowerPriority(curr & ~PRIORITY_FLAGS)) { ++ return; ++ } ++ ++ if (curr == (curr = this.compareAndExchangePriorityVolatile(curr, priority.priority | (curr & PRIORITY_FLAGS)))) { ++ return; ++ } ++ ++ // failed, retry ++ ++ ++failures; ++ for (int i = 0; i < failures; ++i) { ++ ConcurrentUtil.backoff(); ++ } ++ } ++ } ++ ++ public void cancel() { ++ if ((this.getAndOrPriorityVolatile(PRIORITY_EXECUTED) & PRIORITY_EXECUTED) != 0) { ++ // cancelled or executed already ++ return; ++ } ++ ++ // OK if we miss the field read, the task cannot complete if the cancelled bit is set and ++ // the write to dataLoadTask will check for the cancelled bit ++ if (this.dataUnloadCancellable != null) { ++ this.dataUnloadCancellable.cancel(); ++ } ++ ++ if (this.dataLoadTask != null) { ++ this.dataLoadTask.cancel(); ++ } ++ ++ this.complete(CANCELLED_DATA, null); ++ } ++ ++ private final AtomicBoolean scheduled = new AtomicBoolean(); ++ ++ public void schedule() { ++ if (this.scheduled.getAndSet(true)) { ++ throw new IllegalStateException("schedule() called twice"); ++ } ++ int priority = this.getPriorityVolatile(); ++ ++ if ((priority & PRIORITY_EXECUTED) != 0) { ++ // cancelled ++ return; ++ } ++ ++ final BiConsumer<CompoundTag, Throwable> consumer = (final CompoundTag data, final Throwable thr) -> { ++ // because cancelScheduled() cannot actually stop this task from executing in every case, we need ++ // to mark complete here to ensure we do not double complete ++ if (LoadDataFromDiskTask.this.markExecuting()) { ++ LoadDataFromDiskTask.this.complete(data, thr); ++ } // else: cancelled ++ }; ++ ++ final PrioritisedExecutor.Priority initialPriority = PrioritisedExecutor.Priority.getPriority(priority); ++ boolean scheduledUnload = false; ++ ++ final NewChunkHolder holder = this.world.chunkTaskScheduler.chunkHolderManager.getChunkHolder(this.chunkX, this.chunkZ); ++ if (holder != null) { ++ final BiConsumer<CompoundTag, Throwable> unloadConsumer = (final CompoundTag data, final Throwable thr) -> { ++ if (data != null) { ++ consumer.accept(data, null); ++ } else { ++ // need to schedule task ++ LoadDataFromDiskTask.this.schedule(false, consumer, PrioritisedExecutor.Priority.getPriority(LoadDataFromDiskTask.this.getPriorityVolatile() & ~PRIORITY_FLAGS)); ++ } ++ }; ++ Cancellable unloadCancellable = null; ++ CompoundTag syncComplete = null; ++ final NewChunkHolder.UnloadTask unloadTask = holder.getUnloadTask(this.type); // can be null if no task exists ++ final Completable<CompoundTag> unloadCompletable = unloadTask == null ? null : unloadTask.completable(); ++ if (unloadCompletable != null) { ++ unloadCancellable = unloadCompletable.addAsynchronousWaiter(unloadConsumer); ++ if (unloadCancellable == null) { ++ syncComplete = unloadCompletable.getResult(); ++ } ++ } ++ ++ if (syncComplete != null) { ++ consumer.accept(syncComplete, null); ++ return; ++ } ++ ++ if (unloadCancellable != null) { ++ scheduledUnload = true; ++ this.dataUnloadCancellable = unloadCancellable; ++ this.dataUnloadTask = unloadTask.task(); ++ } ++ } ++ ++ this.schedule(scheduledUnload, consumer, initialPriority); ++ } ++ ++ private void schedule(final boolean scheduledUnload, final BiConsumer<CompoundTag, Throwable> consumer, final PrioritisedExecutor.Priority initialPriority) { ++ int priority = this.getPriorityVolatile(); ++ ++ if ((priority & PRIORITY_EXECUTED) != 0) { ++ // cancelled ++ return; ++ } ++ ++ if (!scheduledUnload) { ++ this.dataLoadTask = RegionFileIOThread.loadDataAsync( ++ this.world, this.chunkX, this.chunkZ, this.type, consumer, ++ initialPriority.isHigherPriority(PrioritisedExecutor.Priority.NORMAL), initialPriority ++ ); ++ } ++ ++ int failures = 0; ++ for (;;) { ++ if (priority == (priority = this.compareAndExchangePriorityVolatile(priority, priority | (scheduledUnload ? PRIORITY_UNLOAD_SCHEDULED : PRIORITY_LOAD_SCHEDULED)))) { ++ return; ++ } ++ ++ if ((priority & PRIORITY_EXECUTED) != 0) { ++ // cancelled or executed ++ if (this.dataUnloadCancellable != null) { ++ this.dataUnloadCancellable.cancel(); ++ } ++ ++ if (this.dataLoadTask != null) { ++ this.dataLoadTask.cancel(); ++ } ++ return; ++ } ++ ++ if (scheduledUnload) { ++ if (this.dataUnloadTask != null) { ++ this.dataUnloadTask.setPriority(PrioritisedExecutor.Priority.getPriority(priority & ~PRIORITY_FLAGS)); ++ } ++ } else { ++ RegionFileIOThread.setPriority(this.world, this.chunkX, this.chunkZ, this.type, PrioritisedExecutor.Priority.getPriority(priority & ~PRIORITY_FLAGS)); ++ } ++ ++ ++failures; ++ for (int i = 0; i < failures; ++i) { ++ ConcurrentUtil.backoff(); ++ } ++ } ++ } ++ ++ /* ++ private static final class LoadDataPriorityHolder extends PriorityHolder { ++ ++ protected final LoadDataFromDiskTask task; ++ ++ protected LoadDataPriorityHolder(final PrioritisedExecutor.Priority priority, final LoadDataFromDiskTask task) { ++ super(priority); ++ this.task = task; ++ } ++ ++ @Override ++ protected void cancelScheduled() { ++ final Cancellable dataLoadTask = this.task.dataLoadTask; ++ if (dataLoadTask != null) { ++ // OK if we miss the field read, the task cannot complete if the cancelled bit is set and ++ // the write to dataLoadTask will check for the cancelled bit ++ this.task.dataLoadTask.cancel(); ++ } ++ this.task.complete(CANCELLED_DATA, null); ++ } ++ ++ @Override ++ protected PrioritisedExecutor.Priority getScheduledPriority() { ++ final LoadDataFromDiskTask task = this.task; ++ return RegionFileIOThread.getPriority(task.world, task.chunkX, task.chunkZ, task.type); ++ } ++ ++ @Override ++ protected void scheduleTask(final PrioritisedExecutor.Priority priority) { ++ final LoadDataFromDiskTask task = this.task; ++ final BiConsumer<CompoundTag, Throwable> consumer = (final CompoundTag data, final Throwable thr) -> { ++ // because cancelScheduled() cannot actually stop this task from executing in every case, we need ++ // to mark complete here to ensure we do not double complete ++ if (LoadDataPriorityHolder.this.markExecuting()) { ++ LoadDataPriorityHolder.this.task.complete(data, thr); ++ } // else: cancelled ++ }; ++ task.dataLoadTask = RegionFileIOThread.loadDataAsync( ++ task.world, task.chunkX, task.chunkZ, task.type, consumer, ++ priority.isHigherPriority(PrioritisedExecutor.Priority.NORMAL), priority ++ ); ++ if (this.isMarkedExecuted()) { ++ // if we are marked as completed, it could be: ++ // 1. we were cancelled ++ // 2. the consumer was completed ++ // in the 2nd case, cancel() does nothing ++ // in the 1st case, we ensure cancel() is called as it is possible for the cancelling thread ++ // to miss the field write here ++ task.dataLoadTask.cancel(); ++ } ++ } ++ ++ @Override ++ protected void lowerPriorityScheduled(final PrioritisedExecutor.Priority priority) { ++ final LoadDataFromDiskTask task = this.task; ++ RegionFileIOThread.lowerPriority(task.world, task.chunkX, task.chunkZ, task.type, priority); ++ } ++ ++ @Override ++ protected void setPriorityScheduled(final PrioritisedExecutor.Priority priority) { ++ final LoadDataFromDiskTask task = this.task; ++ RegionFileIOThread.setPriority(task.world, task.chunkX, task.chunkZ, task.type, priority); ++ } ++ ++ @Override ++ protected void raisePriorityScheduled(final PrioritisedExecutor.Priority priority) { ++ final LoadDataFromDiskTask task = this.task; ++ RegionFileIOThread.raisePriority(task.world, task.chunkX, task.chunkZ, task.type, priority); ++ } ++ } ++ */ ++ } ++} +diff --git a/src/main/java/io/papermc/paper/chunk/system/scheduling/NewChunkHolder.java b/src/main/java/io/papermc/paper/chunk/system/scheduling/NewChunkHolder.java +new file mode 100644 +index 0000000000000000000000000000000000000000..56b07a3306e5735816c8d89601b519cb0db6379a +--- /dev/null ++++ b/src/main/java/io/papermc/paper/chunk/system/scheduling/NewChunkHolder.java +@@ -0,0 +1,2106 @@ ++package io.papermc.paper.chunk.system.scheduling; ++ ++import ca.spottedleaf.concurrentutil.completable.Completable; ++import ca.spottedleaf.concurrentutil.executor.Cancellable; ++import ca.spottedleaf.concurrentutil.executor.standard.DelayedPrioritisedTask; ++import ca.spottedleaf.concurrentutil.executor.standard.PrioritisedExecutor; ++import ca.spottedleaf.concurrentutil.lock.ReentrantAreaLock; ++import ca.spottedleaf.concurrentutil.util.ConcurrentUtil; ++import com.google.gson.JsonArray; ++import com.google.gson.JsonElement; ++import com.google.gson.JsonObject; ++import com.google.gson.JsonPrimitive; ++import com.mojang.logging.LogUtils; ++import io.papermc.paper.chunk.system.io.RegionFileIOThread; ++import io.papermc.paper.chunk.system.poi.PoiChunk; ++import io.papermc.paper.util.CoordinateUtils; ++import io.papermc.paper.util.TickThread; ++import io.papermc.paper.util.WorldUtil; ++import io.papermc.paper.world.ChunkEntitySlices; ++import it.unimi.dsi.fastutil.objects.Reference2ObjectLinkedOpenHashMap; ++import it.unimi.dsi.fastutil.objects.Reference2ObjectMap; ++import it.unimi.dsi.fastutil.objects.Reference2ObjectOpenHashMap; ++import it.unimi.dsi.fastutil.objects.ReferenceLinkedOpenHashSet; ++import net.minecraft.nbt.CompoundTag; ++import net.minecraft.server.level.ChunkHolder; ++import net.minecraft.server.level.ChunkLevel; ++import net.minecraft.server.level.FullChunkStatus; ++import net.minecraft.server.level.ServerLevel; ++import net.minecraft.server.level.TicketType; ++import net.minecraft.world.entity.Entity; ++import net.minecraft.world.level.ChunkPos; ++import net.minecraft.world.level.chunk.ChunkAccess; ++import net.minecraft.world.level.chunk.status.ChunkStatus; ++import net.minecraft.world.level.chunk.ImposterProtoChunk; ++import net.minecraft.world.level.chunk.LevelChunk; ++import net.minecraft.world.level.chunk.storage.ChunkSerializer; ++import net.minecraft.world.level.chunk.storage.EntityStorage; ++import org.slf4j.Logger; ++import java.lang.invoke.VarHandle; ++import java.util.ArrayList; ++import java.util.Iterator; ++import java.util.List; ++import java.util.Map; ++import java.util.Objects; ++import java.util.concurrent.atomic.AtomicBoolean; ++import java.util.function.Consumer; ++ ++public final class NewChunkHolder { ++ ++ private static final Logger LOGGER = LogUtils.getClassLogger(); ++ ++ public static final Thread.UncaughtExceptionHandler CHUNKSYSTEM_UNCAUGHT_EXCEPTION_HANDLER = new Thread.UncaughtExceptionHandler() { ++ @Override ++ public void uncaughtException(final Thread thread, final Throwable throwable) { ++ if (!(throwable instanceof ThreadDeath)) { ++ LOGGER.error("Uncaught exception in thread " + thread.getName(), throwable); ++ } ++ } ++ }; ++ ++ public final ServerLevel world; ++ public final int chunkX; ++ public final int chunkZ; ++ ++ public final ChunkTaskScheduler scheduler; ++ ++ // load/unload state ++ ++ // chunk data state ++ ++ private ChunkEntitySlices entityChunk; ++ // entity chunk that is loaded, but not yet deserialized ++ private CompoundTag pendingEntityChunk; ++ ++ ChunkEntitySlices loadInEntityChunk(final boolean transientChunk) { ++ TickThread.ensureTickThread(this.world, this.chunkX, this.chunkZ, "Cannot sync load entity data off-main"); ++ final CompoundTag entityChunk; ++ final ChunkEntitySlices ret; ++ final ReentrantAreaLock.Node schedulingLock = this.scheduler.schedulingLockArea.lock(this.chunkX, this.chunkZ); ++ try { ++ if (this.entityChunk != null && (transientChunk || !this.entityChunk.isTransient())) { ++ return this.entityChunk; ++ } ++ final CompoundTag pendingEntityChunk = this.pendingEntityChunk; ++ if (!transientChunk && pendingEntityChunk == null) { ++ throw new IllegalStateException("Must load entity data from disk before loading in the entity chunk!"); ++ } ++ ++ if (this.entityChunk == null) { ++ ret = this.entityChunk = new ChunkEntitySlices( ++ this.world, this.chunkX, this.chunkZ, this.getChunkStatus(), ++ WorldUtil.getMinSection(this.world), WorldUtil.getMaxSection(this.world) ++ ); ++ ++ ret.setTransient(transientChunk); ++ ++ this.world.getEntityLookup().entitySectionLoad(this.chunkX, this.chunkZ, ret); ++ } else { ++ // transientChunk = false here ++ ret = this.entityChunk; ++ this.entityChunk.setTransient(false); ++ } ++ ++ if (!transientChunk) { ++ this.pendingEntityChunk = null; ++ entityChunk = pendingEntityChunk == EMPTY_ENTITY_CHUNK ? null : pendingEntityChunk; ++ } else { ++ entityChunk = null; ++ } ++ } finally { ++ this.scheduler.schedulingLockArea.unlock(schedulingLock); ++ } ++ ++ if (!transientChunk) { ++ if (entityChunk != null) { ++ final List<Entity> entities = EntityStorage.readEntities(this.world, entityChunk); ++ ++ this.world.getEntityLookup().addEntityChunkEntities(entities, new ChunkPos(this.chunkX, this.chunkZ)); ++ } ++ } ++ ++ return ret; ++ } ++ ++ // needed to distinguish whether the entity chunk has been read from disk but is empty or whether it has _not_ ++ // been read from disk ++ private static final CompoundTag EMPTY_ENTITY_CHUNK = new CompoundTag(); ++ ++ private ChunkLoadTask.EntityDataLoadTask entityDataLoadTask; ++ // note: if entityDataLoadTask is cancelled, but on its completion entityDataLoadTaskWaiters.size() != 0, ++ // then the task is rescheduled ++ private List<GenericDataLoadTaskCallback> entityDataLoadTaskWaiters; ++ ++ public ChunkLoadTask.EntityDataLoadTask getEntityDataLoadTask() { ++ return this.entityDataLoadTask; ++ } ++ ++ // must hold schedule lock for the two below functions ++ ++ // returns only if the data has been loaded from disk, DOES NOT relate to whether it has been deserialized ++ // or added into the world (or even into entityChunk) ++ public boolean isEntityChunkNBTLoaded() { ++ return (this.entityChunk != null && !this.entityChunk.isTransient()) || this.pendingEntityChunk != null; ++ } ++ ++ private void completeEntityLoad(final GenericDataLoadTask.TaskResult<CompoundTag, Throwable> result) { ++ final List<GenericDataLoadTaskCallback> completeWaiters; ++ ChunkLoadTask.EntityDataLoadTask entityDataLoadTask = null; ++ boolean scheduleEntityTask = false; ++ ReentrantAreaLock.Node schedulingLock = this.scheduler.schedulingLockArea.lock(this.chunkX, this.chunkZ); ++ try { ++ final List<GenericDataLoadTaskCallback> waiters = this.entityDataLoadTaskWaiters; ++ this.entityDataLoadTask = null; ++ if (result != null) { ++ this.entityDataLoadTaskWaiters = null; ++ this.pendingEntityChunk = result.left() == null ? EMPTY_ENTITY_CHUNK : result.left(); ++ if (result.right() != null) { ++ LOGGER.error("Unhandled entity data load exception, data data will be lost: ", result.right()); ++ } ++ ++ for (final GenericDataLoadTaskCallback callback : waiters) { ++ callback.markCompleted(); ++ } ++ ++ completeWaiters = waiters; ++ } else { ++ // cancelled ++ completeWaiters = null; ++ ++ // need to re-schedule? ++ if (waiters.isEmpty()) { ++ this.entityDataLoadTaskWaiters = null; ++ // no tasks to schedule _for_ ++ } else { ++ entityDataLoadTask = this.entityDataLoadTask = new ChunkLoadTask.EntityDataLoadTask( ++ this.scheduler, this.world, this.chunkX, this.chunkZ, this.getEffectivePriority() ++ ); ++ entityDataLoadTask.addCallback(this::completeEntityLoad); ++ // need one schedule() per waiter ++ for (final GenericDataLoadTaskCallback callback : waiters) { ++ scheduleEntityTask |= entityDataLoadTask.schedule(true); ++ } ++ } ++ } ++ } finally { ++ this.scheduler.schedulingLockArea.unlock(schedulingLock); ++ } ++ ++ if (scheduleEntityTask) { ++ entityDataLoadTask.scheduleNow(); ++ } ++ ++ // avoid holding the scheduling lock while completing ++ if (completeWaiters != null) { ++ for (final GenericDataLoadTaskCallback callback : completeWaiters) { ++ callback.acceptCompleted(result); ++ } ++ } ++ ++ schedulingLock = this.scheduler.schedulingLockArea.lock(this.chunkX, this.chunkZ); ++ try { ++ this.checkUnload(); ++ } finally { ++ this.scheduler.schedulingLockArea.unlock(schedulingLock); ++ } ++ } ++ ++ // note: it is guaranteed that the consumer cannot be called for the entirety that the schedule lock is held ++ // however, when the consumer is invoked, it will hold the schedule lock ++ public GenericDataLoadTaskCallback getOrLoadEntityData(final Consumer<GenericDataLoadTask.TaskResult<CompoundTag, Throwable>> consumer) { ++ if (this.isEntityChunkNBTLoaded()) { ++ throw new IllegalStateException("Cannot load entity data, it is already loaded"); ++ } ++ // why not just acquire the lock? because the caller NEEDS to call isEntityChunkNBTLoaded before this! ++ if (!this.scheduler.schedulingLockArea.isHeldByCurrentThread(this.chunkX, this.chunkZ)) { ++ throw new IllegalStateException("Must hold scheduling lock"); ++ } ++ ++ final GenericDataLoadTaskCallback ret = new EntityDataLoadTaskCallback((Consumer)consumer, this); ++ ++ if (this.entityDataLoadTask == null) { ++ this.entityDataLoadTask = new ChunkLoadTask.EntityDataLoadTask( ++ this.scheduler, this.world, this.chunkX, this.chunkZ, this.getEffectivePriority() ++ ); ++ this.entityDataLoadTask.addCallback(this::completeEntityLoad); ++ this.entityDataLoadTaskWaiters = new ArrayList<>(); ++ } ++ this.entityDataLoadTaskWaiters.add(ret); ++ if (this.entityDataLoadTask.schedule(true)) { ++ ret.schedule = this.entityDataLoadTask; ++ } ++ this.checkUnload(); ++ ++ return ret; ++ } ++ ++ private static final class EntityDataLoadTaskCallback extends GenericDataLoadTaskCallback { ++ ++ public EntityDataLoadTaskCallback(final Consumer<GenericDataLoadTask.TaskResult<?, Throwable>> consumer, final NewChunkHolder chunkHolder) { ++ super(consumer, chunkHolder); ++ } ++ ++ @Override ++ void internalCancel() { ++ this.chunkHolder.entityDataLoadTaskWaiters.remove(this); ++ this.chunkHolder.entityDataLoadTask.cancel(); ++ } ++ } ++ ++ private PoiChunk poiChunk; ++ ++ private ChunkLoadTask.PoiDataLoadTask poiDataLoadTask; ++ // note: if entityDataLoadTask is cancelled, but on its completion entityDataLoadTaskWaiters.size() != 0, ++ // then the task is rescheduled ++ private List<GenericDataLoadTaskCallback> poiDataLoadTaskWaiters; ++ ++ public ChunkLoadTask.PoiDataLoadTask getPoiDataLoadTask() { ++ return this.poiDataLoadTask; ++ } ++ ++ // must hold schedule lock for the two below functions ++ ++ public boolean isPoiChunkLoaded() { ++ return this.poiChunk != null; ++ } ++ ++ private void completePoiLoad(final GenericDataLoadTask.TaskResult<PoiChunk, Throwable> result) { ++ final List<GenericDataLoadTaskCallback> completeWaiters; ++ ChunkLoadTask.PoiDataLoadTask poiDataLoadTask = null; ++ boolean schedulePoiTask = false; ++ ReentrantAreaLock.Node schedulingLock = this.scheduler.schedulingLockArea.lock(this.chunkX, this.chunkZ); ++ try { ++ final List<GenericDataLoadTaskCallback> waiters = this.poiDataLoadTaskWaiters; ++ this.poiDataLoadTask = null; ++ if (result != null) { ++ this.poiDataLoadTaskWaiters = null; ++ this.poiChunk = result.left(); ++ if (result.right() != null) { ++ LOGGER.error("Unhandled poi load exception, poi data will be lost: ", result.right()); ++ } ++ ++ for (final GenericDataLoadTaskCallback callback : waiters) { ++ callback.markCompleted(); ++ } ++ ++ completeWaiters = waiters; ++ } else { ++ // cancelled ++ completeWaiters = null; ++ ++ // need to re-schedule? ++ if (waiters.isEmpty()) { ++ this.poiDataLoadTaskWaiters = null; ++ // no tasks to schedule _for_ ++ } else { ++ poiDataLoadTask = this.poiDataLoadTask = new ChunkLoadTask.PoiDataLoadTask( ++ this.scheduler, this.world, this.chunkX, this.chunkZ, this.getEffectivePriority() ++ ); ++ poiDataLoadTask.addCallback(this::completePoiLoad); ++ // need one schedule() per waiter ++ for (final GenericDataLoadTaskCallback callback : waiters) { ++ schedulePoiTask |= poiDataLoadTask.schedule(true); ++ } ++ } ++ } ++ } finally { ++ this.scheduler.schedulingLockArea.unlock(schedulingLock); ++ } ++ ++ if (schedulePoiTask) { ++ poiDataLoadTask.scheduleNow(); ++ } ++ ++ // avoid holding the scheduling lock while completing ++ if (completeWaiters != null) { ++ for (final GenericDataLoadTaskCallback callback : completeWaiters) { ++ callback.acceptCompleted(result); ++ } ++ } ++ schedulingLock = this.scheduler.schedulingLockArea.lock(this.chunkX, this.chunkZ); ++ try { ++ this.checkUnload(); ++ } finally { ++ this.scheduler.schedulingLockArea.unlock(schedulingLock); ++ } ++ } ++ ++ // note: it is guaranteed that the consumer cannot be called for the entirety that the schedule lock is held ++ // however, when the consumer is invoked, it will hold the schedule lock ++ public GenericDataLoadTaskCallback getOrLoadPoiData(final Consumer<GenericDataLoadTask.TaskResult<PoiChunk, Throwable>> consumer) { ++ if (this.isPoiChunkLoaded()) { ++ throw new IllegalStateException("Cannot load poi data, it is already loaded"); ++ } ++ // why not just acquire the lock? because the caller NEEDS to call isPoiChunkLoaded before this! ++ if (!this.scheduler.schedulingLockArea.isHeldByCurrentThread(this.chunkX, this.chunkZ)) { ++ throw new IllegalStateException("Must hold scheduling lock"); ++ } ++ ++ final GenericDataLoadTaskCallback ret = new PoiDataLoadTaskCallback((Consumer)consumer, this); ++ ++ if (this.poiDataLoadTask == null) { ++ this.poiDataLoadTask = new ChunkLoadTask.PoiDataLoadTask( ++ this.scheduler, this.world, this.chunkX, this.chunkZ, this.getEffectivePriority() ++ ); ++ this.poiDataLoadTask.addCallback(this::completePoiLoad); ++ this.poiDataLoadTaskWaiters = new ArrayList<>(); ++ } ++ this.poiDataLoadTaskWaiters.add(ret); ++ if (this.poiDataLoadTask.schedule(true)) { ++ ret.schedule = this.poiDataLoadTask; ++ } ++ this.checkUnload(); ++ ++ return ret; ++ } ++ ++ private static final class PoiDataLoadTaskCallback extends GenericDataLoadTaskCallback { ++ ++ public PoiDataLoadTaskCallback(final Consumer<GenericDataLoadTask.TaskResult<?, Throwable>> consumer, final NewChunkHolder chunkHolder) { ++ super(consumer, chunkHolder); ++ } ++ ++ @Override ++ void internalCancel() { ++ this.chunkHolder.poiDataLoadTaskWaiters.remove(this); ++ this.chunkHolder.poiDataLoadTask.cancel(); ++ } ++ } ++ ++ public static abstract class GenericDataLoadTaskCallback implements Cancellable { ++ ++ protected final Consumer<GenericDataLoadTask.TaskResult<?, Throwable>> consumer; ++ protected final NewChunkHolder chunkHolder; ++ protected boolean completed; ++ protected GenericDataLoadTask<?, ?> schedule; ++ protected final AtomicBoolean scheduled = new AtomicBoolean(); ++ ++ public GenericDataLoadTaskCallback(final Consumer<GenericDataLoadTask.TaskResult<?, Throwable>> consumer, ++ final NewChunkHolder chunkHolder) { ++ this.consumer = consumer; ++ this.chunkHolder = chunkHolder; ++ } ++ ++ public void schedule() { ++ if (this.scheduled.getAndSet(true)) { ++ throw new IllegalStateException("Double calling schedule()"); ++ } ++ if (this.schedule != null) { ++ this.schedule.scheduleNow(); ++ this.schedule = null; ++ } ++ } ++ ++ boolean isCompleted() { ++ return this.completed; ++ } ++ ++ // must hold scheduling lock ++ private boolean setCompleted() { ++ if (this.completed) { ++ return false; ++ } ++ return this.completed = true; ++ } ++ ++ // must hold scheduling lock ++ void markCompleted() { ++ if (this.completed) { ++ throw new IllegalStateException("May not be completed here"); ++ } ++ this.completed = true; ++ } ++ ++ void acceptCompleted(final GenericDataLoadTask.TaskResult<?, Throwable> result) { ++ if (result != null) { ++ if (this.completed) { ++ this.consumer.accept(result); ++ } else { ++ throw new IllegalStateException("Cannot be uncompleted at this point"); ++ } ++ } else { ++ throw new NullPointerException("Result cannot be null (cancelled)"); ++ } ++ } ++ ++ // holds scheduling lock ++ abstract void internalCancel(); ++ ++ @Override ++ public boolean cancel() { ++ final NewChunkHolder holder = this.chunkHolder; // Folia - use area based lock to reduce contention ++ final ReentrantAreaLock.Node schedulingLock = holder.scheduler.schedulingLockArea.lock(holder.chunkX, holder.chunkZ); ++ try { ++ if (!this.completed) { ++ this.completed = true; ++ this.internalCancel(); ++ return true; ++ } ++ return false; ++ } finally { ++ holder.scheduler.schedulingLockArea.unlock(schedulingLock); ++ } ++ } ++ } ++ ++ private ChunkAccess currentChunk; ++ ++ // generation status state ++ ++ /** ++ * Current status the chunk has been brought up to by the chunk system. null indicates no work at all ++ */ ++ private ChunkStatus currentGenStatus; ++ ++ // This allows unsynchronised access to the chunk and last gen status ++ private volatile ChunkCompletion lastChunkCompletion; ++ ++ public ChunkCompletion getLastChunkCompletion() { ++ return this.lastChunkCompletion; ++ } ++ ++ public static final record ChunkCompletion(ChunkAccess chunk, ChunkStatus genStatus) {}; ++ ++ /** ++ * The target final chunk status the chunk system will bring the chunk to. ++ */ ++ private ChunkStatus requestedGenStatus; ++ ++ private ChunkProgressionTask generationTask; ++ private ChunkStatus generationTaskStatus; ++ ++ /** ++ * contains the neighbours that this chunk generation is blocking on ++ */ ++ protected final ReferenceLinkedOpenHashSet<NewChunkHolder> neighboursBlockingGenTask = new ReferenceLinkedOpenHashSet<>(4); ++ ++ /** ++ * map of ChunkHolder -> Required Status for this chunk ++ */ ++ protected final Reference2ObjectLinkedOpenHashMap<NewChunkHolder, ChunkStatus> neighboursWaitingForUs = new Reference2ObjectLinkedOpenHashMap<>(); ++ ++ public void addGenerationBlockingNeighbour(final NewChunkHolder neighbour) { ++ this.neighboursBlockingGenTask.add(neighbour); ++ } ++ ++ public void addWaitingNeighbour(final NewChunkHolder neighbour, final ChunkStatus requiredStatus) { ++ final boolean wasEmpty = this.neighboursWaitingForUs.isEmpty(); ++ this.neighboursWaitingForUs.put(neighbour, requiredStatus); ++ if (wasEmpty) { ++ this.checkUnload(); ++ } ++ } ++ ++ // priority state ++ ++ // the target priority for this chunk to generate at ++ // TODO this will screw over scheduling at lower priorities to neighbours, fix ++ private PrioritisedExecutor.Priority priority = PrioritisedExecutor.Priority.NORMAL; ++ private boolean priorityLocked; ++ ++ // the priority neighbouring chunks have requested this chunk generate at ++ private PrioritisedExecutor.Priority neighbourRequestedPriority = PrioritisedExecutor.Priority.IDLE; ++ ++ public PrioritisedExecutor.Priority getEffectivePriority() { ++ return PrioritisedExecutor.Priority.max(this.priority, this.neighbourRequestedPriority); ++ } ++ ++ protected void recalculateNeighbourRequestedPriority() { ++ if (this.neighboursWaitingForUs.isEmpty()) { ++ this.neighbourRequestedPriority = PrioritisedExecutor.Priority.IDLE; ++ return; ++ } ++ ++ PrioritisedExecutor.Priority max = PrioritisedExecutor.Priority.IDLE; ++ ++ for (final NewChunkHolder holder : this.neighboursWaitingForUs.keySet()) { ++ final PrioritisedExecutor.Priority neighbourPriority = holder.getEffectivePriority(); ++ if (neighbourPriority.isHigherPriority(max)) { ++ max = neighbourPriority; ++ } ++ } ++ ++ final PrioritisedExecutor.Priority current = this.getEffectivePriority(); ++ this.neighbourRequestedPriority = max; ++ final PrioritisedExecutor.Priority next = this.getEffectivePriority(); ++ ++ if (current == next) { ++ return; ++ } ++ ++ // our effective priority has changed, so change our task ++ if (this.generationTask != null) { ++ this.generationTask.setPriority(next); ++ } ++ ++ // now propagate this to our neighbours ++ this.recalculateNeighbourPriorities(); ++ } ++ ++ public void recalculateNeighbourPriorities() { ++ for (final NewChunkHolder holder : this.neighboursBlockingGenTask) { ++ holder.recalculateNeighbourRequestedPriority(); ++ } ++ } ++ ++ // must hold scheduling lock ++ public void raisePriority(final PrioritisedExecutor.Priority priority) { ++ if (this.priority != null && this.priority.isHigherOrEqualPriority(priority)) { ++ return; ++ } ++ this.setPriority(priority); ++ } ++ ++ private void lockPriority() { ++ this.priority = PrioritisedExecutor.Priority.NORMAL; ++ this.priorityLocked = true; ++ } ++ ++ // must hold scheduling lock ++ public void setPriority(final PrioritisedExecutor.Priority priority) { ++ if (this.priorityLocked) { ++ return; ++ } ++ final PrioritisedExecutor.Priority old = this.getEffectivePriority(); ++ this.priority = priority; ++ final PrioritisedExecutor.Priority newPriority = this.getEffectivePriority(); ++ ++ if (old != newPriority) { ++ if (this.generationTask != null) { ++ this.generationTask.setPriority(newPriority); ++ } ++ } ++ ++ this.recalculateNeighbourPriorities(); ++ } ++ ++ // must hold scheduling lock ++ public void lowerPriority(final PrioritisedExecutor.Priority priority) { ++ if (this.priority != null && this.priority.isLowerOrEqualPriority(priority)) { ++ return; ++ } ++ this.setPriority(priority); ++ } ++ ++ // error handling state ++ private ChunkStatus failedGenStatus; ++ private Throwable genTaskException; ++ private Thread genTaskFailedThread; ++ ++ private boolean failedLightUpdate; ++ ++ public void failedLightUpdate() { ++ this.failedLightUpdate = true; ++ } ++ ++ public boolean hasFailedGeneration() { ++ return this.genTaskException != null; ++ } ++ ++ // ticket level state ++ private int oldTicketLevel = ChunkLevel.MAX_LEVEL + 1; ++ private int currentTicketLevel = ChunkLevel.MAX_LEVEL + 1; ++ ++ public int getTicketLevel() { ++ return this.currentTicketLevel; ++ } ++ ++ public final ChunkHolder vanillaChunkHolder; ++ ++ public NewChunkHolder(final ServerLevel world, final int chunkX, final int chunkZ, final ChunkTaskScheduler scheduler) { ++ this.world = world; ++ this.chunkX = chunkX; ++ this.chunkZ = chunkZ; ++ this.scheduler = scheduler; ++ this.vanillaChunkHolder = new ChunkHolder(new ChunkPos(chunkX, chunkZ), world, world.getLightEngine(), world.chunkSource.chunkMap, this); ++ } ++ ++ protected ImposterProtoChunk wrappedChunkForNeighbour; ++ ++ // holds scheduling lock ++ public ChunkAccess getChunkForNeighbourAccess() { ++ // Vanilla overrides the status futures with an imposter chunk to prevent writes to full chunks ++ // But we don't store per-status futures, so we need this hack ++ if (this.wrappedChunkForNeighbour != null) { ++ return this.wrappedChunkForNeighbour; ++ } ++ final ChunkAccess ret = this.currentChunk; ++ return ret instanceof LevelChunk fullChunk ? this.wrappedChunkForNeighbour = new ImposterProtoChunk(fullChunk, false) : ret; ++ } ++ ++ public ChunkAccess getCurrentChunk() { ++ return this.currentChunk; ++ } ++ ++ int getCurrentTicketLevel() { ++ return this.currentTicketLevel; ++ } ++ ++ void updateTicketLevel(final int toLevel) { ++ this.currentTicketLevel = toLevel; ++ } ++ ++ private int totalNeighboursUsingThisChunk = 0; ++ ++ // holds schedule lock ++ public void addNeighbourUsingChunk() { ++ final int now = ++this.totalNeighboursUsingThisChunk; ++ ++ if (now == 1) { ++ this.checkUnload(); ++ } ++ } ++ ++ // holds schedule lock ++ public void removeNeighbourUsingChunk() { ++ final int now = --this.totalNeighboursUsingThisChunk; ++ ++ if (now == 0) { ++ this.checkUnload(); ++ } ++ ++ if (now < 0) { ++ throw new IllegalStateException("Neighbours using this chunk cannot be negative"); ++ } ++ } ++ ++ // must hold scheduling lock ++ // returns string reason for why chunk should remain loaded, null otherwise ++ public final String isSafeToUnload() { ++ // is ticket level below threshold? ++ if (this.oldTicketLevel <= ChunkHolderManager.MAX_TICKET_LEVEL) { ++ return "ticket_level"; ++ } ++ ++ // are we being used by another chunk for generation? ++ if (this.totalNeighboursUsingThisChunk != 0) { ++ return "neighbours_generating"; ++ } ++ ++ // are we going to be used by another chunk for generation? ++ if (!this.neighboursWaitingForUs.isEmpty()) { ++ return "neighbours_waiting"; ++ } ++ ++ // chunk must be marked inaccessible (i.e unloaded to plugins) ++ if (this.getChunkStatus() != FullChunkStatus.INACCESSIBLE) { ++ return "fullchunkstatus"; ++ } ++ ++ // are we currently generating anything, or have requested generation? ++ if (this.generationTask != null) { ++ return "generating"; ++ } ++ if (this.requestedGenStatus != null) { ++ return "requested_generation"; ++ } ++ ++ // entity data requested? ++ if (this.entityDataLoadTask != null) { ++ return "entity_data_requested"; ++ } ++ ++ // poi data requested? ++ if (this.poiDataLoadTask != null) { ++ return "poi_data_requested"; ++ } ++ ++ // are we pending serialization? ++ if (this.entityDataUnload != null) { ++ return "entity_serialization"; ++ } ++ if (this.poiDataUnload != null) { ++ return "poi_serialization"; ++ } ++ if (this.chunkDataUnload != null) { ++ return "chunk_serialization"; ++ } ++ ++ // Note: light tasks do not need a check, as they add a ticket. ++ ++ // nothing is using this chunk, so it should be unloaded ++ return null; ++ } ++ ++ /** Unloaded from chunk map */ ++ boolean killed; ++ ++ // must hold scheduling lock ++ private void checkUnload() { ++ if (this.killed) { ++ return; ++ } ++ if (this.isSafeToUnload() == null) { ++ // ensure in unload queue ++ this.scheduler.chunkHolderManager.unloadQueue.addChunk(this.chunkX, this.chunkZ); ++ } else { ++ // ensure not in unload queue ++ this.scheduler.chunkHolderManager.unloadQueue.removeChunk(this.chunkX, this.chunkZ); ++ } ++ } ++ ++ static final record UnloadState(NewChunkHolder holder, ChunkAccess chunk, ChunkEntitySlices entityChunk, PoiChunk poiChunk) {}; ++ ++ // note: these are completed with null to indicate that no write occurred ++ // they are also completed with null to indicate a null write occurred ++ private UnloadTask chunkDataUnload; ++ private UnloadTask entityDataUnload; ++ private UnloadTask poiDataUnload; ++ ++ public static final record UnloadTask(Completable<CompoundTag> completable, DelayedPrioritisedTask task) {} ++ ++ public UnloadTask getUnloadTask(final RegionFileIOThread.RegionFileType type) { ++ switch (type) { ++ case CHUNK_DATA: ++ return this.chunkDataUnload; ++ case ENTITY_DATA: ++ return this.entityDataUnload; ++ case POI_DATA: ++ return this.poiDataUnload; ++ default: ++ throw new IllegalStateException("Unknown regionfile type " + type); ++ } ++ } ++ ++ private UnloadState unloadState; ++ ++ // holds schedule lock ++ UnloadState unloadStage1() { ++ // because we hold the scheduling lock, we cannot actually unload anything ++ // so we need to null this chunk's state ++ ChunkAccess chunk = this.currentChunk; ++ ChunkEntitySlices entityChunk = this.entityChunk; ++ PoiChunk poiChunk = this.poiChunk; ++ // chunk state ++ this.currentChunk = null; ++ this.currentGenStatus = null; ++ this.wrappedChunkForNeighbour = null; ++ this.lastChunkCompletion = null; ++ // entity chunk state ++ this.entityChunk = null; ++ this.pendingEntityChunk = null; ++ ++ // poi chunk state ++ this.poiChunk = null; ++ ++ // priority state ++ this.priorityLocked = false; ++ ++ if (chunk != null) { ++ this.chunkDataUnload = new UnloadTask(new Completable<>(), new DelayedPrioritisedTask(PrioritisedExecutor.Priority.NORMAL)); ++ } ++ if (poiChunk != null) { ++ this.poiDataUnload = new UnloadTask(new Completable<>(), null); ++ } ++ if (entityChunk != null) { ++ this.entityDataUnload = new UnloadTask(new Completable<>(), null); ++ } ++ ++ return this.unloadState = (chunk != null || entityChunk != null || poiChunk != null) ? new UnloadState(this, chunk, entityChunk, poiChunk) : null; ++ } ++ ++ // data is null if failed or does not need to be saved ++ void completeAsyncChunkDataSave(final CompoundTag data) { ++ if (data != null) { ++ RegionFileIOThread.scheduleSave(this.world, this.chunkX, this.chunkZ, data, RegionFileIOThread.RegionFileType.CHUNK_DATA); ++ } ++ this.chunkDataUnload.completable().complete(data); ++ final ReentrantAreaLock.Node schedulingLock = this.scheduler.schedulingLockArea.lock(this.chunkX, this.chunkZ); ++ try { ++ // can only write to these fields while holding the schedule lock ++ this.chunkDataUnload = null; ++ this.checkUnload(); ++ } finally { ++ this.scheduler.schedulingLockArea.unlock(schedulingLock); ++ } ++ } ++ ++ void unloadStage2(final UnloadState state) { ++ this.unloadState = null; ++ final ChunkAccess chunk = state.chunk(); ++ final ChunkEntitySlices entityChunk = state.entityChunk(); ++ final PoiChunk poiChunk = state.poiChunk(); ++ ++ final boolean shouldLevelChunkNotSave = (chunk instanceof LevelChunk levelChunk && levelChunk.mustNotSave); ++ ++ // unload chunk data ++ if (chunk != null) { ++ if (chunk instanceof LevelChunk levelChunk) { ++ levelChunk.setLoaded(false); ++ } ++ ++ if (!shouldLevelChunkNotSave) { ++ this.saveChunk(chunk, true); ++ } else { ++ this.completeAsyncChunkDataSave(null); ++ } ++ ++ if (chunk instanceof LevelChunk levelChunk) { ++ this.world.unload(levelChunk); ++ } ++ } ++ ++ // unload entity data ++ if (entityChunk != null) { ++ this.saveEntities(entityChunk, true); ++ // yes this is a hack to pass the compound tag through... ++ final CompoundTag lastEntityUnload = this.lastEntityUnload; ++ this.lastEntityUnload = null; ++ ++ if (entityChunk.unload()) { ++ final ReentrantAreaLock.Node schedulingLock = this.scheduler.schedulingLockArea.lock(this.chunkX, this.chunkZ); ++ try { ++ entityChunk.setTransient(true); ++ this.entityChunk = entityChunk; ++ } finally { ++ this.scheduler.schedulingLockArea.unlock(schedulingLock); ++ } ++ } else { ++ this.world.getEntityLookup().entitySectionUnload(this.chunkX, this.chunkZ); ++ } ++ // we need to delay the callback until after determining transience, otherwise a potential loader could ++ // set entityChunk before we do ++ this.entityDataUnload.completable().complete(lastEntityUnload); ++ } ++ ++ // unload poi data ++ if (poiChunk != null) { ++ if (poiChunk.isDirty() && !shouldLevelChunkNotSave) { ++ this.savePOI(poiChunk, true); ++ } else { ++ this.poiDataUnload.completable().complete(null); ++ } ++ ++ if (poiChunk.isLoaded()) { ++ this.world.getPoiManager().onUnload(CoordinateUtils.getChunkKey(this.chunkX, this.chunkZ)); ++ } ++ } ++ } ++ ++ boolean unloadStage3() { ++ // can only write to these while holding the schedule lock, and we instantly complete them in stage2 ++ this.poiDataUnload = null; ++ this.entityDataUnload = null; ++ ++ // we need to check if anything has been loaded in the meantime (or if we have transient entities) ++ if (this.entityChunk != null || this.poiChunk != null || this.currentChunk != null) { ++ return false; ++ } ++ ++ return this.isSafeToUnload() == null; ++ } ++ ++ private void cancelGenTask() { ++ if (this.generationTask != null) { ++ this.generationTask.cancel(); ++ } else { ++ // otherwise, we are blocking on neighbours, so remove them ++ if (!this.neighboursBlockingGenTask.isEmpty()) { ++ for (final NewChunkHolder neighbour : this.neighboursBlockingGenTask) { ++ if (neighbour.neighboursWaitingForUs.remove(this) == null) { ++ throw new IllegalStateException("Corrupt state"); ++ } ++ if (neighbour.neighboursWaitingForUs.isEmpty()) { ++ neighbour.checkUnload(); ++ } ++ } ++ this.neighboursBlockingGenTask.clear(); ++ this.checkUnload(); ++ } ++ } ++ } ++ ++ // holds: ticket level update lock ++ // holds: schedule lock ++ public void processTicketLevelUpdate(final List<ChunkProgressionTask> scheduledTasks, final List<NewChunkHolder> changedLoadStatus) { ++ final int oldLevel = this.oldTicketLevel; ++ final int newLevel = this.currentTicketLevel; ++ ++ if (oldLevel == newLevel) { ++ return; ++ } ++ ++ this.oldTicketLevel = newLevel; ++ ++ final FullChunkStatus oldState = ChunkLevel.fullStatus(oldLevel); ++ final FullChunkStatus newState = ChunkLevel.fullStatus(newLevel); ++ final boolean oldUnloaded = oldLevel > ChunkHolderManager.MAX_TICKET_LEVEL; ++ final boolean newUnloaded = newLevel > ChunkHolderManager.MAX_TICKET_LEVEL; ++ ++ final ChunkStatus maxGenerationStatusOld = ChunkLevel.generationStatus(oldLevel); ++ final ChunkStatus maxGenerationStatusNew = ChunkLevel.generationStatus(newLevel); ++ ++ // check for cancellations from downgrading ticket level ++ if (this.requestedGenStatus != null && !newState.isOrAfter(FullChunkStatus.FULL) && newLevel > oldLevel) { ++ // note: cancel() may invoke onChunkGenComplete synchronously here ++ if (newUnloaded) { ++ // need to cancel all tasks ++ // note: requested status must be set to null here before cancellation, to indicate to the ++ // completion logic that we do not want rescheduling to occur ++ this.requestedGenStatus = null; ++ this.cancelGenTask(); ++ } else { ++ final ChunkStatus toCancel = maxGenerationStatusNew.getNextStatus(); ++ final ChunkStatus currentRequestedStatus = this.requestedGenStatus; ++ ++ if (currentRequestedStatus.isOrAfter(toCancel)) { ++ // we do have to cancel something here ++ // clamp requested status to the maximum ++ if (this.currentGenStatus != null && this.currentGenStatus.isOrAfter(maxGenerationStatusNew)) { ++ // already generated to status, so we must cancel ++ this.requestedGenStatus = null; ++ this.cancelGenTask(); ++ } else { ++ // not generated to status, so we may have to cancel ++ // note: gen task is always 1 status above current gen status if not null ++ this.requestedGenStatus = maxGenerationStatusNew; ++ if (this.generationTaskStatus != null && this.generationTaskStatus.isOrAfter(toCancel)) { ++ // TOOD is this even possible? i don't think so ++ throw new IllegalStateException("?????"); ++ } ++ } ++ } ++ } ++ } ++ ++ if (newState != oldState) { ++ if (newState.isOrAfter(oldState)) { ++ // status upgrade ++ if (!oldState.isOrAfter(FullChunkStatus.FULL) && newState.isOrAfter(FullChunkStatus.FULL)) { ++ // may need to schedule full load ++ if (this.currentGenStatus != ChunkStatus.FULL) { ++ if (this.requestedGenStatus != null) { ++ this.requestedGenStatus = ChunkStatus.FULL; ++ } else { ++ this.scheduler.schedule( ++ this.chunkX, this.chunkZ, ChunkStatus.FULL, this, scheduledTasks ++ ); ++ } ++ } else { ++ // now we are fully loaded ++ this.queueBorderFullStatus(true, changedLoadStatus); ++ } ++ } ++ } else { ++ // status downgrade ++ if (!newState.isOrAfter(FullChunkStatus.ENTITY_TICKING) && oldState.isOrAfter(FullChunkStatus.ENTITY_TICKING)) { ++ this.completeFullStatusConsumers(FullChunkStatus.ENTITY_TICKING, null); ++ } ++ ++ if (!newState.isOrAfter(FullChunkStatus.BLOCK_TICKING) && oldState.isOrAfter(FullChunkStatus.BLOCK_TICKING)) { ++ this.completeFullStatusConsumers(FullChunkStatus.BLOCK_TICKING, null); ++ } ++ ++ if (!newState.isOrAfter(FullChunkStatus.FULL) && oldState.isOrAfter(FullChunkStatus.FULL)) { ++ this.completeFullStatusConsumers(FullChunkStatus.FULL, null); ++ } ++ } ++ } ++ ++ if (oldState != newState) { ++ if (this.onTicketUpdate(oldState, newState)) { ++ changedLoadStatus.add(this); ++ } ++ } ++ ++ if (oldUnloaded != newUnloaded) { ++ this.checkUnload(); ++ } ++ } ++ ++ /* ++ For full chunks, vanilla just loads chunks around it up to FEATURES, 1 radius ++ ++ For ticking chunks, it updates the persistent entity manager (soon to be completely nuked by EntitySliceManager, which ++ will also need to be updated but with far less implications) ++ It also shoves the scheduled block ticks into the tick scheduler ++ ++ For entity ticking chunks, updates the entity manager (see above) ++ */ ++ ++ static final int NEIGHBOUR_RADIUS = 2; ++ private long fullNeighbourChunksLoadedBitset; ++ ++ private static int getFullNeighbourIndex(final int relativeX, final int relativeZ) { ++ // index = (relativeX + NEIGHBOUR_CACHE_RADIUS) + (relativeZ + NEIGHBOUR_CACHE_RADIUS) * (NEIGHBOUR_CACHE_RADIUS * 2 + 1) ++ // optimised variant of the above by moving some of the ops to compile time ++ return relativeX + (relativeZ * (NEIGHBOUR_RADIUS * 2 + 1)) + (NEIGHBOUR_RADIUS + NEIGHBOUR_RADIUS * ((NEIGHBOUR_RADIUS * 2 + 1))); ++ } ++ public final boolean isNeighbourFullLoaded(final int relativeX, final int relativeZ) { ++ return (this.fullNeighbourChunksLoadedBitset & (1L << getFullNeighbourIndex(relativeX, relativeZ))) != 0; ++ } ++ ++ // returns true if this chunk changed full status ++ public final boolean setNeighbourFullLoaded(final int relativeX, final int relativeZ) { ++ final long before = this.fullNeighbourChunksLoadedBitset; ++ final int index = getFullNeighbourIndex(relativeX, relativeZ); ++ this.fullNeighbourChunksLoadedBitset |= (1L << index); ++ return this.onNeighbourChange(before, this.fullNeighbourChunksLoadedBitset); ++ } ++ ++ // returns true if this chunk changed full status ++ public final boolean setNeighbourFullUnloaded(final int relativeX, final int relativeZ) { ++ final long before = this.fullNeighbourChunksLoadedBitset; ++ final int index = getFullNeighbourIndex(relativeX, relativeZ); ++ this.fullNeighbourChunksLoadedBitset &= ~(1L << index); ++ return this.onNeighbourChange(before, this.fullNeighbourChunksLoadedBitset); ++ } ++ ++ public static boolean areNeighboursFullLoaded(final long bitset, final int radius) { ++ // index = relativeX + (relativeZ * (NEIGHBOUR_CACHE_RADIUS * 2 + 1)) + (NEIGHBOUR_CACHE_RADIUS + NEIGHBOUR_CACHE_RADIUS * ((NEIGHBOUR_CACHE_RADIUS * 2 + 1))) ++ switch (radius) { ++ case 0: { ++ return (bitset & (1L << getFullNeighbourIndex(0, 0))) != 0L; ++ } ++ case 1: { ++ long mask = 0L; ++ for (int dx = -1; dx <= 1; ++dx) { ++ for (int dz = -1; dz <= 1; ++dz) { ++ mask |= (1L << getFullNeighbourIndex(dx, dz)); ++ } ++ } ++ return (bitset & mask) == mask; ++ } ++ case 2: { ++ long mask = 0L; ++ for (int dx = -2; dx <= 2; ++dx) { ++ for (int dz = -2; dz <= 2; ++dz) { ++ mask |= (1L << getFullNeighbourIndex(dx, dz)); ++ } ++ } ++ return (bitset & mask) == mask; ++ } ++ ++ default: { ++ throw new IllegalArgumentException("Radius not recognized: " + radius); ++ } ++ } ++ } ++ ++ // upper 16 bits are pending status, lower 16 bits are current status ++ private volatile long chunkStatus; ++ private static final long PENDING_STATUS_MASK = Long.MIN_VALUE >> 31; ++ private static final FullChunkStatus[] CHUNK_STATUS_BY_ID = FullChunkStatus.values(); ++ private static final VarHandle CHUNK_STATUS_HANDLE = ConcurrentUtil.getVarHandle(NewChunkHolder.class, "chunkStatus", long.class); ++ ++ public static FullChunkStatus getCurrentChunkStatus(final long encoded) { ++ return CHUNK_STATUS_BY_ID[(int)encoded]; ++ } ++ ++ public static FullChunkStatus getPendingChunkStatus(final long encoded) { ++ return CHUNK_STATUS_BY_ID[(int)(encoded >>> 32)]; ++ } ++ ++ public FullChunkStatus getChunkStatus() { ++ return getCurrentChunkStatus(((long)CHUNK_STATUS_HANDLE.getVolatile((NewChunkHolder)this))); ++ } ++ ++ public boolean isEntityTickingReady() { ++ return this.getChunkStatus().isOrAfter(FullChunkStatus.ENTITY_TICKING); ++ } ++ ++ public boolean isTickingReady() { ++ return this.getChunkStatus().isOrAfter(FullChunkStatus.BLOCK_TICKING); ++ } ++ ++ public boolean isFullChunkReady() { ++ return this.getChunkStatus().isOrAfter(FullChunkStatus.FULL); ++ } ++ ++ private static FullChunkStatus getStatusForBitset(final long bitset) { ++ if (areNeighboursFullLoaded(bitset, 2)) { ++ return FullChunkStatus.ENTITY_TICKING; ++ } else if (areNeighboursFullLoaded(bitset, 1)) { ++ return FullChunkStatus.BLOCK_TICKING; ++ } else if (areNeighboursFullLoaded(bitset, 0)) { ++ return FullChunkStatus.FULL; ++ } else { ++ return FullChunkStatus.INACCESSIBLE; ++ } ++ } ++ ++ // note: only while updating ticket level, so holds ticket update lock + scheduling lock ++ protected final boolean onTicketUpdate(final FullChunkStatus oldState, final FullChunkStatus newState) { ++ if (oldState == newState) { ++ return false; ++ } ++ ++ // preserve border request after full status complete, as it does not set anything in the bitset ++ FullChunkStatus byNeighbours = getStatusForBitset(this.fullNeighbourChunksLoadedBitset); ++ if (byNeighbours == FullChunkStatus.INACCESSIBLE && newState.isOrAfter(FullChunkStatus.FULL) && this.currentGenStatus == ChunkStatus.FULL) { ++ byNeighbours = FullChunkStatus.FULL; ++ } ++ ++ final FullChunkStatus toSet; ++ ++ if (newState.isOrAfter(byNeighbours)) { ++ // must clamp to neighbours level, even though we have the ticket level ++ toSet = byNeighbours; ++ } else { ++ // must clamp to ticket level, even though we have the neighbours ++ toSet = newState; ++ } ++ ++ long curr = (long)CHUNK_STATUS_HANDLE.getVolatile((NewChunkHolder)this); ++ ++ if (curr == ((long)toSet.ordinal() | ((long)toSet.ordinal() << 32))) { ++ // nothing to do ++ return false; ++ } ++ ++ int failures = 0; ++ for (;;) { ++ final long update = (curr & ~PENDING_STATUS_MASK) | ((long)toSet.ordinal() << 32); ++ if (curr == (curr = (long)CHUNK_STATUS_HANDLE.compareAndExchange((NewChunkHolder)this, curr, update))) { ++ return true; ++ } ++ ++ ++failures; ++ for (int i = 0; i < failures; ++i) { ++ ConcurrentUtil.backoff(); ++ } ++ } ++ } ++ ++ protected final boolean onNeighbourChange(final long bitsetBefore, final long bitsetAfter) { ++ FullChunkStatus oldState = getStatusForBitset(bitsetBefore); ++ FullChunkStatus newState = getStatusForBitset(bitsetAfter); ++ final FullChunkStatus currStateTicketLevel = ChunkLevel.fullStatus(this.oldTicketLevel); ++ if (oldState.isOrAfter(currStateTicketLevel)) { ++ oldState = currStateTicketLevel; ++ } ++ if (newState.isOrAfter(currStateTicketLevel)) { ++ newState = currStateTicketLevel; ++ } ++ // preserve border request after full status complete, as it does not set anything in the bitset ++ if (newState == FullChunkStatus.INACCESSIBLE && currStateTicketLevel.isOrAfter(FullChunkStatus.FULL) && this.currentGenStatus == ChunkStatus.FULL) { ++ newState = FullChunkStatus.FULL; ++ } ++ ++ if (oldState == newState) { ++ return false; ++ } ++ ++ int failures = 0; ++ for (long curr = (long)CHUNK_STATUS_HANDLE.getVolatile((NewChunkHolder)this);;) { ++ final long update = (curr & ~PENDING_STATUS_MASK) | ((long)newState.ordinal() << 32); ++ if (curr == (curr = (long)CHUNK_STATUS_HANDLE.compareAndExchange((NewChunkHolder)this, curr, update))) { ++ return true; ++ } ++ ++ ++failures; ++ for (int i = 0; i < failures; ++i) { ++ ConcurrentUtil.backoff(); ++ } ++ } ++ } ++ ++ private boolean queueBorderFullStatus(final boolean loaded, final List<NewChunkHolder> changedFullStatus) { ++ final FullChunkStatus toStatus = loaded ? FullChunkStatus.FULL : FullChunkStatus.INACCESSIBLE; ++ ++ int failures = 0; ++ for (long curr = (long)CHUNK_STATUS_HANDLE.getVolatile((NewChunkHolder)this);;) { ++ final FullChunkStatus currPending = getPendingChunkStatus(curr); ++ if (loaded && currPending != FullChunkStatus.INACCESSIBLE) { ++ throw new IllegalStateException("Expected " + FullChunkStatus.INACCESSIBLE + " for pending, but got " + currPending); ++ } ++ ++ final long update = (curr & ~PENDING_STATUS_MASK) | ((long)toStatus.ordinal() << 32); ++ if (curr == (curr = (long)CHUNK_STATUS_HANDLE.compareAndExchange((NewChunkHolder)this, curr, update))) { ++ if ((int)(update) != (int)(update >>> 32)) { ++ changedFullStatus.add(this); ++ return true; ++ } ++ return false; ++ } ++ ++ ++failures; ++ for (int i = 0; i < failures; ++i) { ++ ConcurrentUtil.backoff(); ++ } ++ } ++ } ++ ++ // only call on main thread, must hold ticket level and scheduling lock ++ private void onFullChunkLoadChange(final boolean loaded, final List<NewChunkHolder> changedFullStatus) { ++ final ReentrantAreaLock.Node schedulingLock = this.scheduler.schedulingLockArea.lock(this.chunkX, this.chunkZ, NEIGHBOUR_RADIUS); ++ try { ++ for (int dz = -NEIGHBOUR_RADIUS; dz <= NEIGHBOUR_RADIUS; ++dz) { ++ for (int dx = -NEIGHBOUR_RADIUS; dx <= NEIGHBOUR_RADIUS; ++dx) { ++ final NewChunkHolder holder = (dx | dz) == 0 ? this : this.scheduler.chunkHolderManager.getChunkHolder(dx + this.chunkX, dz + this.chunkZ); ++ if (loaded) { ++ if (holder.setNeighbourFullLoaded(-dx, -dz)) { ++ changedFullStatus.add(holder); ++ } ++ } else { ++ if (holder != null && holder.setNeighbourFullUnloaded(-dx, -dz)) { ++ changedFullStatus.add(holder); ++ } ++ } ++ } ++ } ++ } finally { ++ this.scheduler.schedulingLockArea.unlock(schedulingLock); ++ } ++ } ++ ++ private FullChunkStatus updateCurrentState(final FullChunkStatus to) { ++ int failures = 0; ++ for (long curr = (long)CHUNK_STATUS_HANDLE.getVolatile((NewChunkHolder)this);;) { ++ final long update = (curr & PENDING_STATUS_MASK) | (long)to.ordinal(); ++ if (curr == (curr = (long)CHUNK_STATUS_HANDLE.compareAndExchange((NewChunkHolder)this, curr, update))) { ++ return getPendingChunkStatus(curr); ++ } ++ ++ ++failures; ++ for (int i = 0; i < failures; ++i) { ++ ConcurrentUtil.backoff(); ++ } ++ } ++ } ++ ++ private void changeEntityChunkStatus(final FullChunkStatus toStatus) { ++ this.world.getEntityLookup().chunkStatusChange(this.chunkX, this.chunkZ, toStatus); ++ } ++ ++ private boolean processingFullStatus = false; ++ ++ // only to be called on the main thread, no locks need to be held ++ public boolean handleFullStatusChange(final List<NewChunkHolder> changedFullStatus) { ++ TickThread.ensureTickThread(this.world, this.chunkX, this.chunkZ, "Cannot update full status thread off-main"); ++ ++ boolean ret = false; ++ ++ if (this.processingFullStatus) { ++ // we cannot process updates recursively ++ return ret; ++ } ++ ++ // note: use opaque reads for chunk status read since we need it to be atomic ++ ++ // test if anything changed ++ long statusCheck = (long)CHUNK_STATUS_HANDLE.getOpaque((NewChunkHolder)this); ++ if ((int)statusCheck == (int)(statusCheck >>> 32)) { ++ // nothing changed ++ return ret; ++ } ++ ++ final ChunkTaskScheduler scheduler = this.scheduler; ++ final ChunkHolderManager holderManager = scheduler.chunkHolderManager; ++ final int ticketKeep; ++ final Long ticketId = Long.valueOf(holderManager.getNextStatusUpgradeId()); ++ final ReentrantAreaLock.Node ticketLock = holderManager.ticketLockArea.lock(this.chunkX, this.chunkZ); ++ try { ++ ticketKeep = this.currentTicketLevel; ++ statusCheck = (long)CHUNK_STATUS_HANDLE.getOpaque((NewChunkHolder)this); ++ // handle race condition where ticket level and target status is updated concurrently ++ if ((int)statusCheck == (int)(statusCheck >>> 32)) { ++ // nothing changed ++ return ret; ++ } ++ holderManager.addTicketAtLevel(TicketType.STATUS_UPGRADE, CoordinateUtils.getChunkKey(this.chunkX, this.chunkZ), ticketKeep, ticketId, false); ++ } finally { ++ holderManager.ticketLockArea.unlock(ticketLock); ++ } ++ ++ this.processingFullStatus = true; ++ try { ++ for (;;) { ++ final long currStateEncoded = (long)CHUNK_STATUS_HANDLE.getOpaque((NewChunkHolder)this); ++ final FullChunkStatus currState = getCurrentChunkStatus(currStateEncoded); ++ FullChunkStatus nextState = getPendingChunkStatus(currStateEncoded); ++ if (currState == nextState) { ++ if (nextState == FullChunkStatus.INACCESSIBLE) { ++ final ReentrantAreaLock.Node schedulingLock = this.scheduler.schedulingLockArea.lock(this.chunkX, this.chunkZ); ++ try { ++ this.checkUnload(); ++ } finally { ++ this.scheduler.schedulingLockArea.unlock(schedulingLock); ++ } ++ } ++ break; ++ } ++ ++ // chunks cannot downgrade state while status is pending a change ++ final LevelChunk chunk = (LevelChunk)this.currentChunk; ++ ++ // Note: we assume that only load/unload contain plugin logic ++ // plugin logic is anything stupid enough to possibly change the chunk status while it is already ++ // being changed (i.e during load it is possible it will try to set to full ticking) ++ // in order to allow this change, we also need this plugin logic to be contained strictly after all ++ // of the chunk system load callbacks are invoked ++ if (nextState.isOrAfter(currState)) { ++ // state upgrade ++ if (!currState.isOrAfter(FullChunkStatus.FULL) && nextState.isOrAfter(FullChunkStatus.FULL)) { ++ nextState = this.updateCurrentState(FullChunkStatus.FULL); ++ holderManager.ensureInAutosave(this); ++ chunk.pushChunkIntoLoadedMap(); ++ this.changeEntityChunkStatus(FullChunkStatus.FULL); ++ chunk.onChunkLoad(this); ++ this.onFullChunkLoadChange(true, changedFullStatus); ++ this.completeFullStatusConsumers(FullChunkStatus.FULL, chunk); ++ } ++ ++ if (!currState.isOrAfter(FullChunkStatus.BLOCK_TICKING) && nextState.isOrAfter(FullChunkStatus.BLOCK_TICKING)) { ++ nextState = this.updateCurrentState(FullChunkStatus.BLOCK_TICKING); ++ this.changeEntityChunkStatus(FullChunkStatus.BLOCK_TICKING); ++ chunk.onChunkTicking(this); ++ this.completeFullStatusConsumers(FullChunkStatus.BLOCK_TICKING, chunk); ++ } ++ ++ if (!currState.isOrAfter(FullChunkStatus.ENTITY_TICKING) && nextState.isOrAfter(FullChunkStatus.ENTITY_TICKING)) { ++ nextState = this.updateCurrentState(FullChunkStatus.ENTITY_TICKING); ++ this.changeEntityChunkStatus(FullChunkStatus.ENTITY_TICKING); ++ chunk.onChunkEntityTicking(this); ++ this.completeFullStatusConsumers(FullChunkStatus.ENTITY_TICKING, chunk); ++ } ++ } else { ++ if (currState.isOrAfter(FullChunkStatus.ENTITY_TICKING) && !nextState.isOrAfter(FullChunkStatus.ENTITY_TICKING)) { ++ this.changeEntityChunkStatus(FullChunkStatus.BLOCK_TICKING); ++ chunk.onChunkNotEntityTicking(this); ++ nextState = this.updateCurrentState(FullChunkStatus.BLOCK_TICKING); ++ } ++ ++ if (currState.isOrAfter(FullChunkStatus.BLOCK_TICKING) && !nextState.isOrAfter(FullChunkStatus.BLOCK_TICKING)) { ++ this.changeEntityChunkStatus(FullChunkStatus.FULL); ++ chunk.onChunkNotTicking(this); ++ nextState = this.updateCurrentState(FullChunkStatus.FULL); ++ } ++ ++ if (currState.isOrAfter(FullChunkStatus.FULL) && !nextState.isOrAfter(FullChunkStatus.FULL)) { ++ this.onFullChunkLoadChange(false, changedFullStatus); ++ this.changeEntityChunkStatus(FullChunkStatus.INACCESSIBLE); ++ chunk.onChunkUnload(this); ++ nextState = this.updateCurrentState(FullChunkStatus.INACCESSIBLE); ++ } ++ } ++ ++ ret = true; ++ } ++ } finally { ++ this.processingFullStatus = false; ++ holderManager.removeTicketAtLevel(TicketType.STATUS_UPGRADE, this.chunkX, this.chunkZ, ticketKeep, ticketId); ++ } ++ ++ return ret; ++ } ++ ++ // note: must hold scheduling lock ++ // rets true if the current requested gen status is not null (effectively, whether further scheduling is not needed) ++ boolean upgradeGenTarget(final ChunkStatus toStatus) { ++ if (toStatus == null) { ++ throw new NullPointerException("toStatus cannot be null"); ++ } ++ if (this.requestedGenStatus == null && this.generationTask == null) { ++ return false; ++ } ++ if (this.requestedGenStatus == null || !this.requestedGenStatus.isOrAfter(toStatus)) { ++ this.requestedGenStatus = toStatus; ++ } ++ return true; ++ } ++ ++ public void setGenerationTarget(final ChunkStatus toStatus) { ++ this.requestedGenStatus = toStatus; ++ } ++ ++ public boolean hasGenerationTask() { ++ return this.generationTask != null; ++ } ++ ++ public ChunkStatus getCurrentGenStatus() { ++ return this.currentGenStatus; ++ } ++ ++ public ChunkStatus getRequestedGenStatus() { ++ return this.requestedGenStatus; ++ } ++ ++ private final Reference2ObjectOpenHashMap<ChunkStatus, List<Consumer<ChunkAccess>>> statusWaiters = new Reference2ObjectOpenHashMap<>(); ++ ++ void addStatusConsumer(final ChunkStatus status, final Consumer<ChunkAccess> consumer) { ++ this.statusWaiters.computeIfAbsent(status, (final ChunkStatus keyInMap) -> { ++ return new ArrayList<>(4); ++ }).add(consumer); ++ } ++ ++ private void completeStatusConsumers(ChunkStatus status, final ChunkAccess chunk) { ++ // need to tell future statuses to complete if cancelled ++ do { ++ this.completeStatusConsumers0(status, chunk); ++ } while (chunk == null && status != (status = status.getNextStatus())); ++ } ++ ++ private void completeStatusConsumers0(final ChunkStatus status, final ChunkAccess chunk) { ++ final List<Consumer<ChunkAccess>> consumers; ++ consumers = this.statusWaiters.remove(status); ++ ++ if (consumers == null) { ++ return; ++ } ++ ++ // must be scheduled to main, we do not trust the callback to not do anything stupid ++ this.scheduler.scheduleChunkTask(this.chunkX, this.chunkZ, () -> { ++ for (final Consumer<ChunkAccess> consumer : consumers) { ++ try { ++ consumer.accept(chunk); ++ } catch (final ThreadDeath thr) { ++ throw thr; ++ } catch (final Throwable thr) { ++ LOGGER.error("Failed to process chunk status callback", thr); ++ } ++ } ++ }, PrioritisedExecutor.Priority.HIGHEST); ++ } ++ ++ private final Reference2ObjectOpenHashMap<FullChunkStatus, List<Consumer<LevelChunk>>> fullStatusWaiters = new Reference2ObjectOpenHashMap<>(); ++ ++ void addFullStatusConsumer(final FullChunkStatus status, final Consumer<LevelChunk> consumer) { ++ this.fullStatusWaiters.computeIfAbsent(status, (final FullChunkStatus keyInMap) -> { ++ return new ArrayList<>(4); ++ }).add(consumer); ++ } ++ ++ private void completeFullStatusConsumers(FullChunkStatus status, final LevelChunk chunk) { ++ // need to tell future statuses to complete if cancelled ++ final FullChunkStatus max = CHUNK_STATUS_BY_ID[CHUNK_STATUS_BY_ID.length - 1]; ++ ++ for (;;) { ++ this.completeFullStatusConsumers0(status, chunk); ++ if (chunk != null || status == max) { ++ break; ++ } ++ status = CHUNK_STATUS_BY_ID[status.ordinal() + 1]; ++ } ++ } ++ ++ private void completeFullStatusConsumers0(final FullChunkStatus status, final LevelChunk chunk) { ++ final List<Consumer<LevelChunk>> consumers; ++ consumers = this.fullStatusWaiters.remove(status); ++ ++ if (consumers == null) { ++ return; ++ } ++ ++ // must be scheduled to main, we do not trust the callback to not do anything stupid ++ this.scheduler.scheduleChunkTask(this.chunkX, this.chunkZ, () -> { ++ for (final Consumer<LevelChunk> consumer : consumers) { ++ try { ++ consumer.accept(chunk); ++ } catch (final ThreadDeath thr) { ++ throw thr; ++ } catch (final Throwable thr) { ++ LOGGER.error("Failed to process chunk status callback", thr); ++ } ++ } ++ }, PrioritisedExecutor.Priority.HIGHEST); ++ } ++ ++ // note: must hold scheduling lock ++ private void onChunkGenComplete(final ChunkAccess newChunk, final ChunkStatus newStatus, ++ final List<ChunkProgressionTask> scheduleList, final List<NewChunkHolder> changedLoadStatus) { ++ if (!this.neighboursBlockingGenTask.isEmpty()) { ++ throw new IllegalStateException("Cannot have neighbours blocking this gen task"); ++ } ++ if (newChunk != null || (this.requestedGenStatus == null || !this.requestedGenStatus.isOrAfter(newStatus))) { ++ this.completeStatusConsumers(newStatus, newChunk); ++ } ++ // done now, clear state (must be done before scheduling new tasks) ++ this.generationTask = null; ++ this.generationTaskStatus = null; ++ if (newChunk == null) { ++ // task was cancelled ++ // should be careful as this could be called while holding the schedule lock and/or inside the ++ // ticket level update ++ // while a task may be cancelled, it is possible for it to be later re-scheduled ++ // however, because generationTask is only set to null on _completion_, the scheduler leaves ++ // the rescheduling logic to us here ++ final ChunkStatus requestedGenStatus = this.requestedGenStatus; ++ this.requestedGenStatus = null; ++ if (requestedGenStatus != null) { ++ // it looks like it has been requested, so we must reschedule ++ if (!this.neighboursWaitingForUs.isEmpty()) { ++ for (final Iterator<Reference2ObjectMap.Entry<NewChunkHolder, ChunkStatus>> iterator = this.neighboursWaitingForUs.reference2ObjectEntrySet().fastIterator(); iterator.hasNext();) { ++ final Reference2ObjectMap.Entry<NewChunkHolder, ChunkStatus> entry = iterator.next(); ++ ++ final NewChunkHolder chunkHolder = entry.getKey(); ++ final ChunkStatus toStatus = entry.getValue(); ++ ++ if (!requestedGenStatus.isOrAfter(toStatus)) { ++ // if we were cancelled, we are responsible for removing the waiter ++ if (!chunkHolder.neighboursBlockingGenTask.remove(this)) { ++ throw new IllegalStateException("Corrupt state"); ++ } ++ if (chunkHolder.neighboursBlockingGenTask.isEmpty()) { ++ chunkHolder.checkUnload(); ++ } ++ iterator.remove(); ++ continue; ++ } ++ } ++ } ++ ++ // note: only after generationTask -> null, generationTaskStatus -> null, and requestedGenStatus -> null ++ this.scheduler.schedule( ++ this.chunkX, this.chunkZ, requestedGenStatus, this, scheduleList ++ ); ++ ++ // return, can't do anything further ++ return; ++ } ++ ++ if (!this.neighboursWaitingForUs.isEmpty()) { ++ for (final NewChunkHolder chunkHolder : this.neighboursWaitingForUs.keySet()) { ++ if (!chunkHolder.neighboursBlockingGenTask.remove(this)) { ++ throw new IllegalStateException("Corrupt state"); ++ } ++ if (chunkHolder.neighboursBlockingGenTask.isEmpty()) { ++ chunkHolder.checkUnload(); ++ } ++ } ++ this.neighboursWaitingForUs.clear(); ++ } ++ // reset priority, we have nothing left to generate to ++ this.setPriority(PrioritisedExecutor.Priority.NORMAL); ++ this.checkUnload(); ++ return; ++ } ++ ++ this.currentChunk = newChunk; ++ this.currentGenStatus = newStatus; ++ this.lastChunkCompletion = new ChunkCompletion(newChunk, newStatus); ++ ++ final ChunkStatus requestedGenStatus = this.requestedGenStatus; ++ ++ List<NewChunkHolder> needsScheduling = null; ++ boolean recalculatePriority = false; ++ for (final Iterator<Reference2ObjectMap.Entry<NewChunkHolder, ChunkStatus>> iterator ++ = this.neighboursWaitingForUs.reference2ObjectEntrySet().fastIterator(); iterator.hasNext();) { ++ final Reference2ObjectMap.Entry<NewChunkHolder, ChunkStatus> entry = iterator.next(); ++ final NewChunkHolder neighbour = entry.getKey(); ++ final ChunkStatus requiredStatus = entry.getValue(); ++ ++ if (!newStatus.isOrAfter(requiredStatus)) { ++ if (requestedGenStatus == null || !requestedGenStatus.isOrAfter(requiredStatus)) { ++ // if we're cancelled, still need to clear this map ++ if (!neighbour.neighboursBlockingGenTask.remove(this)) { ++ throw new IllegalStateException("Neighbour is not waiting for us?"); ++ } ++ if (neighbour.neighboursBlockingGenTask.isEmpty()) { ++ neighbour.checkUnload(); ++ } ++ ++ iterator.remove(); ++ } ++ continue; ++ } ++ ++ // doesn't matter what isCancelled is here, we need to schedule if we can ++ ++ recalculatePriority = true; ++ if (!neighbour.neighboursBlockingGenTask.remove(this)) { ++ throw new IllegalStateException("Neighbour is not waiting for us?"); ++ } ++ ++ if (neighbour.neighboursBlockingGenTask.isEmpty()) { ++ if (neighbour.requestedGenStatus != null) { ++ if (needsScheduling == null) { ++ needsScheduling = new ArrayList<>(); ++ } ++ needsScheduling.add(neighbour); ++ } else { ++ neighbour.checkUnload(); ++ } ++ } ++ ++ // remove last; access to entry will throw if removed ++ iterator.remove(); ++ } ++ ++ if (newStatus == ChunkStatus.FULL) { ++ this.lockPriority(); ++ // must use oldTicketLevel, we hold the schedule lock but not the ticket level lock ++ // however, schedule lock needs to be held for ticket level callback, so we're fine here ++ if (ChunkLevel.fullStatus(this.oldTicketLevel).isOrAfter(FullChunkStatus.FULL)) { ++ this.queueBorderFullStatus(true, changedLoadStatus); ++ } ++ } ++ ++ if (recalculatePriority) { ++ this.recalculateNeighbourRequestedPriority(); ++ } ++ ++ if (requestedGenStatus != null && !newStatus.isOrAfter(requestedGenStatus)) { ++ this.scheduleNeighbours(needsScheduling, scheduleList); ++ ++ // we need to schedule more tasks now ++ this.scheduler.schedule( ++ this.chunkX, this.chunkZ, requestedGenStatus, this, scheduleList ++ ); ++ } else { ++ // we're done now ++ if (requestedGenStatus != null) { ++ this.requestedGenStatus = null; ++ } ++ // reached final stage, so stop scheduling now ++ this.setPriority(PrioritisedExecutor.Priority.NORMAL); ++ this.checkUnload(); ++ ++ this.scheduleNeighbours(needsScheduling, scheduleList); ++ } ++ } ++ ++ private void scheduleNeighbours(final List<NewChunkHolder> needsScheduling, final List<ChunkProgressionTask> scheduleList) { ++ if (needsScheduling != null) { ++ for (int i = 0, len = needsScheduling.size(); i < len; ++i) { ++ final NewChunkHolder neighbour = needsScheduling.get(i); ++ ++ this.scheduler.schedule( ++ neighbour.chunkX, neighbour.chunkZ, neighbour.requestedGenStatus, neighbour, scheduleList ++ ); ++ } ++ } ++ } ++ ++ public void setGenerationTask(final ChunkProgressionTask generationTask, final ChunkStatus taskStatus, ++ final List<NewChunkHolder> neighbours) { ++ if (this.generationTask != null || (this.currentGenStatus != null && this.currentGenStatus.isOrAfter(taskStatus))) { ++ throw new IllegalStateException("Currently generating or provided task is trying to generate to a level we are already at!"); ++ } ++ if (this.requestedGenStatus == null || !this.requestedGenStatus.isOrAfter(taskStatus)) { ++ throw new IllegalStateException("Cannot schedule generation task when not requested"); ++ } ++ this.generationTask = generationTask; ++ this.generationTaskStatus = taskStatus; ++ ++ for (int i = 0, len = neighbours.size(); i < len; ++i) { ++ neighbours.get(i).addNeighbourUsingChunk(); ++ } ++ ++ this.checkUnload(); ++ ++ generationTask.onComplete((final ChunkAccess access, final Throwable thr) -> { ++ if (generationTask != this.generationTask) { ++ throw new IllegalStateException( ++ "Cannot complete generation task '" + generationTask + "' because we are waiting on '" + this.generationTask + "' instead!" ++ ); ++ } ++ if (thr != null) { ++ if (this.genTaskException != null) { ++ // first one is probably the TRUE problem ++ return; ++ } ++ // don't set generation task to null, so that scheduling will not attempt to create another task and it ++ // will automatically block any further scheduling usage of this chunk as it will wait forever for a failed ++ // task to complete ++ this.genTaskException = thr; ++ this.failedGenStatus = taskStatus; ++ this.genTaskFailedThread = Thread.currentThread(); ++ ++ this.scheduler.unrecoverableChunkSystemFailure(this.chunkX, this.chunkZ, Map.of( ++ "Generation task", ChunkTaskScheduler.stringIfNull(generationTask), ++ "Task to status", ChunkTaskScheduler.stringIfNull(taskStatus) ++ ), thr); ++ return; ++ } ++ ++ final boolean scheduleTasks; ++ List<ChunkProgressionTask> tasks = ChunkHolderManager.getCurrentTicketUpdateScheduling(); ++ if (tasks == null) { ++ scheduleTasks = true; ++ tasks = new ArrayList<>(); ++ } else { ++ scheduleTasks = false; ++ // we are currently updating ticket levels, so we already hold the schedule lock ++ // this means we have to leave the ticket level update to handle the scheduling ++ } ++ final List<NewChunkHolder> changedLoadStatus = new ArrayList<>(); ++ // theoretically, we could schedule a chunk at the max radius which performs another max radius access. So we need to double the radius. ++ final ReentrantAreaLock.Node schedulingLock = this.scheduler.schedulingLockArea.lock(this.chunkX, this.chunkZ, 2 * ChunkTaskScheduler.getMaxAccessRadius()); ++ try { ++ for (int i = 0, len = neighbours.size(); i < len; ++i) { ++ neighbours.get(i).removeNeighbourUsingChunk(); ++ } ++ this.onChunkGenComplete(access, taskStatus, tasks, changedLoadStatus); ++ } finally { ++ this.scheduler.schedulingLockArea.unlock(schedulingLock); ++ } ++ this.scheduler.chunkHolderManager.addChangedStatuses(changedLoadStatus); ++ ++ if (scheduleTasks) { ++ // can't hold the lock while scheduling, so we have to build the tasks and then schedule after ++ for (int i = 0, len = tasks.size(); i < len; ++i) { ++ tasks.get(i).schedule(); ++ } ++ } ++ }); ++ } ++ ++ public PoiChunk getPoiChunk() { ++ return this.poiChunk; ++ } ++ ++ public ChunkEntitySlices getEntityChunk() { ++ return this.entityChunk; ++ } ++ ++ public long lastAutoSave; ++ ++ public static final record SaveStat(boolean savedChunk, boolean savedEntityChunk, boolean savedPoiChunk) {} ++ ++ public SaveStat save(final boolean shutdown, final boolean unloading) { ++ TickThread.ensureTickThread(this.world, this.chunkX, this.chunkZ, "Cannot save data off-main"); ++ ++ ChunkAccess chunk = this.getCurrentChunk(); ++ PoiChunk poi = this.getPoiChunk(); ++ ChunkEntitySlices entities = this.getEntityChunk(); ++ boolean executedUnloadTask = false; ++ ++ if (shutdown) { ++ // make sure that the async unloads complete ++ if (this.unloadState != null) { ++ // must have errored during unload ++ chunk = this.unloadState.chunk(); ++ poi = this.unloadState.poiChunk(); ++ entities = this.unloadState.entityChunk(); ++ } ++ final UnloadTask chunkUnloadTask = this.chunkDataUnload; ++ final DelayedPrioritisedTask chunkDataUnloadTask = chunkUnloadTask == null ? null : chunkUnloadTask.task(); ++ if (chunkDataUnloadTask != null) { ++ final PrioritisedExecutor.PrioritisedTask unloadTask = chunkDataUnloadTask.getTask(); ++ if (unloadTask != null) { ++ executedUnloadTask = unloadTask.execute(); ++ } ++ } ++ } ++ ++ boolean canSaveChunk = !(chunk instanceof LevelChunk levelChunk && levelChunk.mustNotSave) && ++ (chunk != null && ((shutdown || chunk instanceof LevelChunk) && chunk.isUnsaved())); ++ boolean canSavePOI = !(chunk instanceof LevelChunk levelChunk && levelChunk.mustNotSave) && (poi != null && poi.isDirty()); ++ boolean canSaveEntities = entities != null; ++ ++ try (co.aikar.timings.Timing ignored = this.world.timings.chunkSave.startTiming()) { // Paper ++ if (canSaveChunk) { ++ canSaveChunk = this.saveChunk(chunk, unloading); ++ } ++ if (canSavePOI) { ++ canSavePOI = this.savePOI(poi, unloading); ++ } ++ if (canSaveEntities) { ++ // on shutdown, we need to force transient entity chunks to save ++ canSaveEntities = this.saveEntities(entities, unloading || shutdown); ++ if (unloading || shutdown) { ++ this.lastEntityUnload = null; ++ } ++ } ++ } ++ ++ return executedUnloadTask | canSaveChunk | canSaveEntities | canSavePOI ? new SaveStat(executedUnloadTask || canSaveChunk, canSaveEntities, canSavePOI): null; ++ } ++ ++ static final class AsyncChunkSerializeTask implements Runnable { ++ ++ private final ServerLevel world; ++ private final ChunkAccess chunk; ++ private final ChunkSerializer.AsyncSaveData asyncSaveData; ++ private final NewChunkHolder toComplete; ++ ++ public AsyncChunkSerializeTask(final ServerLevel world, final ChunkAccess chunk, final ChunkSerializer.AsyncSaveData asyncSaveData, ++ final NewChunkHolder toComplete) { ++ this.world = world; ++ this.chunk = chunk; ++ this.asyncSaveData = asyncSaveData; ++ this.toComplete = toComplete; ++ } ++ ++ @Override ++ public void run() { ++ final CompoundTag toSerialize; ++ try { ++ toSerialize = ChunkSerializer.saveChunk(this.world, this.chunk, this.asyncSaveData); ++ } catch (final ThreadDeath death) { ++ throw death; ++ } catch (final Throwable throwable) { ++ LOGGER.error("Failed to asynchronously save chunk " + this.chunk.getPos() + " for world '" + this.world.getWorld().getName() + "', falling back to synchronous save", throwable); ++ this.world.chunkTaskScheduler.scheduleChunkTask(this.chunk.locX, this.chunk.locZ, () -> { ++ final CompoundTag synchronousSave; ++ try { ++ synchronousSave = ChunkSerializer.saveChunk(AsyncChunkSerializeTask.this.world, AsyncChunkSerializeTask.this.chunk, AsyncChunkSerializeTask.this.asyncSaveData); ++ } catch (final ThreadDeath death) { ++ throw death; ++ } catch (final Throwable throwable2) { ++ LOGGER.error("Failed to synchronously save chunk " + AsyncChunkSerializeTask.this.chunk.getPos() + " for world '" + AsyncChunkSerializeTask.this.world.getWorld().getName() + "', chunk data will be lost", throwable2); ++ AsyncChunkSerializeTask.this.toComplete.completeAsyncChunkDataSave(null); ++ return; ++ } ++ ++ AsyncChunkSerializeTask.this.toComplete.completeAsyncChunkDataSave(synchronousSave); ++ LOGGER.info("Successfully serialized chunk " + AsyncChunkSerializeTask.this.chunk.getPos() + " for world '" + AsyncChunkSerializeTask.this.world.getWorld().getName() + "' synchronously"); ++ ++ }, PrioritisedExecutor.Priority.HIGHEST); ++ return; ++ } ++ this.toComplete.completeAsyncChunkDataSave(toSerialize); ++ } ++ ++ @Override ++ public String toString() { ++ return "AsyncChunkSerializeTask{" + ++ "chunk={pos=" + this.chunk.getPos() + ",world=\"" + this.world.getWorld().getName() + "\"}" + ++ "}"; ++ } ++ } ++ ++ private boolean saveChunk(final ChunkAccess chunk, final boolean unloading) { ++ if (!chunk.isUnsaved()) { ++ if (unloading) { ++ this.completeAsyncChunkDataSave(null); ++ } ++ return false; ++ } ++ boolean completing = false; ++ try { ++ if (unloading) { ++ try { ++ final ChunkSerializer.AsyncSaveData asyncSaveData = ChunkSerializer.getAsyncSaveData(this.world, chunk); ++ ++ final PrioritisedExecutor.PrioritisedTask task = this.scheduler.loadExecutor.createTask(new AsyncChunkSerializeTask(this.world, chunk, asyncSaveData, this)); ++ ++ this.chunkDataUnload.task().setTask(task); ++ ++ task.queue(); ++ ++ chunk.setUnsaved(false); ++ ++ return true; ++ } catch (final ThreadDeath death) { ++ throw death; ++ } catch (final Throwable thr) { ++ LOGGER.error("Failed to prepare async chunk data (" + this.chunkX + "," + this.chunkZ + ") in world '" + this.world.getWorld().getName() + "', falling back to synchronous save", thr); ++ // fall through to synchronous save ++ } ++ } ++ ++ final CompoundTag save = ChunkSerializer.saveChunk(this.world, chunk, null); ++ ++ if (unloading) { ++ completing = true; ++ this.completeAsyncChunkDataSave(save); ++ LOGGER.info("Successfully serialized chunk data (" + this.chunkX + "," + this.chunkZ + ") in world '" + this.world.getWorld().getName() + "' synchronously"); ++ } else { ++ RegionFileIOThread.scheduleSave(this.world, this.chunkX, this.chunkZ, save, RegionFileIOThread.RegionFileType.CHUNK_DATA); ++ } ++ chunk.setUnsaved(false); ++ } catch (final ThreadDeath death) { ++ throw death; ++ } catch (final Throwable thr) { ++ LOGGER.error("Failed to save chunk data (" + this.chunkX + "," + this.chunkZ + ") in world '" + this.world.getWorld().getName() + "'"); ++ if (unloading && !completing) { ++ this.completeAsyncChunkDataSave(null); ++ } ++ } ++ ++ return true; ++ } ++ ++ private boolean lastEntitySaveNull; ++ private CompoundTag lastEntityUnload; ++ private boolean saveEntities(final ChunkEntitySlices entities, final boolean unloading) { ++ try { ++ CompoundTag mergeFrom = null; ++ if (entities.isTransient()) { ++ if (!unloading) { ++ // if we're a transient chunk, we cannot save until unloading because otherwise a double save will ++ // result in double adding the entities ++ return false; ++ } ++ try { ++ mergeFrom = RegionFileIOThread.loadData(this.world, this.chunkX, this.chunkZ, RegionFileIOThread.RegionFileType.ENTITY_DATA, PrioritisedExecutor.Priority.BLOCKING); ++ } catch (final Exception ex) { ++ LOGGER.error("Cannot merge transient entities for chunk (" + this.chunkX + "," + this.chunkZ + ") in world '" + this.world.getWorld().getName() + "', data on disk will be replaced", ex); ++ } ++ } ++ ++ final CompoundTag save = entities.save(); ++ if (mergeFrom != null) { ++ if (save == null) { ++ // don't override the data on disk with nothing ++ return false; ++ } else { ++ EntityStorage.copyEntities(mergeFrom, save); ++ } ++ } ++ if (save == null && this.lastEntitySaveNull) { ++ return false; ++ } ++ ++ RegionFileIOThread.scheduleSave(this.world, this.chunkX, this.chunkZ, save, RegionFileIOThread.RegionFileType.ENTITY_DATA); ++ this.lastEntitySaveNull = save == null; ++ if (unloading) { ++ this.lastEntityUnload = save; ++ } ++ } catch (final ThreadDeath death) { ++ throw death; ++ } catch (final Throwable thr) { ++ LOGGER.error("Failed to save entity data (" + this.chunkX + "," + this.chunkZ + ") in world '" + this.world.getWorld().getName() + "'"); ++ } ++ ++ return true; ++ } ++ ++ private boolean lastPoiSaveNull; ++ private boolean savePOI(final PoiChunk poi, final boolean unloading) { ++ try { ++ final CompoundTag save = poi.save(); ++ poi.setDirty(false); ++ if (save == null && this.lastPoiSaveNull) { ++ if (unloading) { ++ this.poiDataUnload.completable().complete(null); ++ } ++ return false; ++ } ++ ++ RegionFileIOThread.scheduleSave(this.world, this.chunkX, this.chunkZ, save, RegionFileIOThread.RegionFileType.POI_DATA); ++ this.lastPoiSaveNull = save == null; ++ if (unloading) { ++ this.poiDataUnload.completable().complete(save); ++ } ++ } catch (final ThreadDeath death) { ++ throw death; ++ } catch (final Throwable thr) { ++ LOGGER.error("Failed to save poi data (" + this.chunkX + "," + this.chunkZ + ") in world '" + this.world.getWorld().getName() + "'"); ++ } ++ ++ return true; ++ } ++ ++ @Override ++ public String toString() { ++ final ChunkCompletion lastCompletion = this.lastChunkCompletion; ++ final ChunkEntitySlices entityChunk = this.entityChunk; ++ final long chunkStatus = this.chunkStatus; ++ final int fullChunkStatus = (int)chunkStatus; ++ final int pendingChunkStatus = (int)(chunkStatus >>> 32); ++ final FullChunkStatus currentFullStatus = fullChunkStatus < 0 || fullChunkStatus >= CHUNK_STATUS_BY_ID.length ? null : CHUNK_STATUS_BY_ID[fullChunkStatus]; ++ final FullChunkStatus pendingFullStatus = pendingChunkStatus < 0 || pendingChunkStatus >= CHUNK_STATUS_BY_ID.length ? null : CHUNK_STATUS_BY_ID[pendingChunkStatus]; ++ return "NewChunkHolder{" + ++ "world=" + this.world.getWorld().getName() + ++ ", chunkX=" + this.chunkX + ++ ", chunkZ=" + this.chunkZ + ++ ", entityChunkFromDisk=" + (entityChunk != null && !entityChunk.isTransient()) + ++ ", lastChunkCompletion={chunk_class=" + (lastCompletion == null || lastCompletion.chunk() == null ? "null" : lastCompletion.chunk().getClass().getName()) + ",status=" + (lastCompletion == null ? "null" : lastCompletion.genStatus()) + "}" + ++ ", currentGenStatus=" + this.currentGenStatus + ++ ", requestedGenStatus=" + this.requestedGenStatus + ++ ", generationTask=" + this.generationTask + ++ ", generationTaskStatus=" + this.generationTaskStatus + ++ ", priority=" + this.priority + ++ ", priorityLocked=" + this.priorityLocked + ++ ", neighbourRequestedPriority=" + this.neighbourRequestedPriority + ++ ", effective_priority=" + this.getEffectivePriority() + ++ ", oldTicketLevel=" + this.oldTicketLevel + ++ ", currentTicketLevel=" + this.currentTicketLevel + ++ ", totalNeighboursUsingThisChunk=" + this.totalNeighboursUsingThisChunk + ++ ", fullNeighbourChunksLoadedBitset=" + this.fullNeighbourChunksLoadedBitset + ++ ", chunkStatusRaw=" + chunkStatus + ++ ", currentChunkStatus=" + currentFullStatus + ++ ", pendingChunkStatus=" + pendingFullStatus + ++ ", is_unload_safe=" + this.isSafeToUnload() + ++ ", killed=" + this.killed + ++ '}'; ++ } ++ ++ private static JsonElement serializeCompletable(final Completable<?> completable) { ++ if (completable == null) { ++ return new JsonPrimitive("null"); ++ } ++ ++ final JsonObject ret = new JsonObject(); ++ final boolean isCompleted = completable.isCompleted(); ++ ret.addProperty("completed", Boolean.valueOf(isCompleted)); ++ ++ if (isCompleted) { ++ ret.addProperty("completed_exceptionally", Boolean.valueOf(completable.getThrowable() != null)); ++ } ++ ++ return ret; ++ } ++ ++ // holds ticket and scheduling lock ++ public JsonObject getDebugJson() { ++ final JsonObject ret = new JsonObject(); ++ ++ final ChunkCompletion lastCompletion = this.lastChunkCompletion; ++ final ChunkEntitySlices slices = this.entityChunk; ++ final PoiChunk poiChunk = this.poiChunk; ++ ++ ret.addProperty("chunkX", Integer.valueOf(this.chunkX)); ++ ret.addProperty("chunkZ", Integer.valueOf(this.chunkZ)); ++ ret.addProperty("entity_chunk", slices == null ? "null" : "transient=" + slices.isTransient()); ++ ret.addProperty("poi_chunk", "null=" + (poiChunk == null)); ++ ret.addProperty("completed_chunk_class", lastCompletion == null ? "null" : lastCompletion.chunk().getClass().getName()); ++ ret.addProperty("completed_gen_status", lastCompletion == null ? "null" : lastCompletion.genStatus().toString()); ++ ret.addProperty("priority", Objects.toString(this.priority)); ++ ret.addProperty("neighbour_requested_priority", Objects.toString(this.neighbourRequestedPriority)); ++ ret.addProperty("generation_task", Objects.toString(this.generationTask)); ++ ret.addProperty("is_safe_unload", Objects.toString(this.isSafeToUnload())); ++ ret.addProperty("old_ticket_level", Integer.valueOf(this.oldTicketLevel)); ++ ret.addProperty("current_ticket_level", Integer.valueOf(this.currentTicketLevel)); ++ ret.addProperty("neighbours_using_chunk", Integer.valueOf(this.totalNeighboursUsingThisChunk)); ++ ++ final JsonObject neighbourWaitState = new JsonObject(); ++ ret.add("neighbour_state", neighbourWaitState); ++ ++ final JsonArray blockingGenNeighbours = new JsonArray(); ++ neighbourWaitState.add("blocking_gen_task", blockingGenNeighbours); ++ for (final NewChunkHolder blockingGenNeighbour : this.neighboursBlockingGenTask) { ++ final JsonObject neighbour = new JsonObject(); ++ blockingGenNeighbours.add(neighbour); ++ ++ neighbour.addProperty("chunkX", Integer.valueOf(blockingGenNeighbour.chunkX)); ++ neighbour.addProperty("chunkZ", Integer.valueOf(blockingGenNeighbour.chunkZ)); ++ } ++ ++ final JsonArray neighboursWaitingForUs = new JsonArray(); ++ neighbourWaitState.add("neighbours_waiting_on_us", neighboursWaitingForUs); ++ for (final Reference2ObjectMap.Entry<NewChunkHolder, ChunkStatus> entry : this.neighboursWaitingForUs.reference2ObjectEntrySet()) { ++ final NewChunkHolder holder = entry.getKey(); ++ final ChunkStatus status = entry.getValue(); ++ ++ final JsonObject neighbour = new JsonObject(); ++ neighboursWaitingForUs.add(neighbour); ++ ++ ++ neighbour.addProperty("chunkX", Integer.valueOf(holder.chunkX)); ++ neighbour.addProperty("chunkZ", Integer.valueOf(holder.chunkZ)); ++ neighbour.addProperty("waiting_for", Objects.toString(status)); ++ } ++ ++ ret.addProperty("fullchunkstatus", Objects.toString(this.getChunkStatus())); ++ ret.addProperty("fullchunkstatus_raw", Long.valueOf(this.chunkStatus)); ++ ret.addProperty("generation_task", Objects.toString(this.generationTask)); ++ ret.addProperty("requested_generation", Objects.toString(this.requestedGenStatus)); ++ ret.addProperty("has_entity_load_task", Boolean.valueOf(this.entityDataLoadTask != null)); ++ ret.addProperty("has_poi_load_task", Boolean.valueOf(this.poiDataLoadTask != null)); ++ ++ final UnloadTask entityDataUnload = this.entityDataUnload; ++ final UnloadTask poiDataUnload = this.poiDataUnload; ++ final UnloadTask chunkDataUnload = this.chunkDataUnload; ++ ++ ret.add("entity_unload_completable", serializeCompletable(entityDataUnload == null ? null : entityDataUnload.completable())); ++ ret.add("poi_unload_completable", serializeCompletable(poiDataUnload == null ? null : poiDataUnload.completable())); ++ ret.add("chunk_unload_completable", serializeCompletable(chunkDataUnload == null ? null : chunkDataUnload.completable())); ++ ++ final DelayedPrioritisedTask unloadTask = chunkDataUnload == null ? null : chunkDataUnload.task(); ++ if (unloadTask == null) { ++ ret.addProperty("unload_task_priority", "null"); ++ ret.addProperty("unload_task_priority_raw", "null"); ++ } else { ++ ret.addProperty("unload_task_priority", Objects.toString(unloadTask.getPriority())); ++ ret.addProperty("unload_task_priority_raw", Integer.valueOf(unloadTask.getPriorityInternal())); ++ } ++ ++ ret.addProperty("killed", Boolean.valueOf(this.killed)); ++ ++ return ret; ++ } ++} +diff --git a/src/main/java/io/papermc/paper/chunk/system/scheduling/PriorityHolder.java b/src/main/java/io/papermc/paper/chunk/system/scheduling/PriorityHolder.java +new file mode 100644 +index 0000000000000000000000000000000000000000..b4c56bf12dc8dd17452210ece4fd67411cc6b2fd +--- /dev/null ++++ b/src/main/java/io/papermc/paper/chunk/system/scheduling/PriorityHolder.java +@@ -0,0 +1,215 @@ ++package io.papermc.paper.chunk.system.scheduling; ++ ++import ca.spottedleaf.concurrentutil.executor.standard.PrioritisedExecutor; ++import ca.spottedleaf.concurrentutil.util.ConcurrentUtil; ++import java.lang.invoke.VarHandle; ++ ++public abstract class PriorityHolder { ++ ++ protected volatile int priority; ++ protected static final VarHandle PRIORITY_HANDLE = ConcurrentUtil.getVarHandle(PriorityHolder.class, "priority", int.class); ++ ++ protected static final int PRIORITY_SCHEDULED = Integer.MIN_VALUE >>> 0; ++ protected static final int PRIORITY_EXECUTED = Integer.MIN_VALUE >>> 1; ++ ++ protected final int getPriorityVolatile() { ++ return (int)PRIORITY_HANDLE.getVolatile((PriorityHolder)this); ++ } ++ ++ protected final int compareAndExchangePriorityVolatile(final int expect, final int update) { ++ return (int)PRIORITY_HANDLE.compareAndExchange((PriorityHolder)this, (int)expect, (int)update); ++ } ++ ++ protected final int getAndOrPriorityVolatile(final int val) { ++ return (int)PRIORITY_HANDLE.getAndBitwiseOr((PriorityHolder)this, (int)val); ++ } ++ ++ protected final void setPriorityPlain(final int val) { ++ PRIORITY_HANDLE.set((PriorityHolder)this, (int)val); ++ } ++ ++ protected PriorityHolder(final PrioritisedExecutor.Priority priority) { ++ if (!PrioritisedExecutor.Priority.isValidPriority(priority)) { ++ throw new IllegalArgumentException("Invalid priority " + priority); ++ } ++ this.setPriorityPlain(priority.priority); ++ } ++ ++ // used only for debug json ++ public boolean isScheduled() { ++ return (this.getPriorityVolatile() & PRIORITY_SCHEDULED) != 0; ++ } ++ ++ // returns false if cancelled ++ protected boolean markExecuting() { ++ return (this.getAndOrPriorityVolatile(PRIORITY_EXECUTED) & PRIORITY_EXECUTED) == 0; ++ } ++ ++ protected boolean isMarkedExecuted() { ++ return (this.getPriorityVolatile() & PRIORITY_EXECUTED) != 0; ++ } ++ ++ public void cancel() { ++ if ((this.getAndOrPriorityVolatile(PRIORITY_EXECUTED) & PRIORITY_EXECUTED) != 0) { ++ // cancelled already ++ return; ++ } ++ this.cancelScheduled(); ++ } ++ ++ public void schedule() { ++ int priority = this.getPriorityVolatile(); ++ ++ if ((priority & PRIORITY_SCHEDULED) != 0) { ++ throw new IllegalStateException("schedule() called twice"); ++ } ++ ++ if ((priority & PRIORITY_EXECUTED) != 0) { ++ // cancelled ++ return; ++ } ++ ++ this.scheduleTask(PrioritisedExecutor.Priority.getPriority(priority)); ++ ++ int failures = 0; ++ for (;;) { ++ if (priority == (priority = this.compareAndExchangePriorityVolatile(priority, priority | PRIORITY_SCHEDULED))) { ++ return; ++ } ++ ++ if ((priority & PRIORITY_SCHEDULED) != 0) { ++ throw new IllegalStateException("schedule() called twice"); ++ } ++ ++ if ((priority & PRIORITY_EXECUTED) != 0) { ++ // cancelled or executed ++ return; ++ } ++ ++ this.setPriorityScheduled(PrioritisedExecutor.Priority.getPriority(priority)); ++ ++ ++failures; ++ for (int i = 0; i < failures; ++i) { ++ ConcurrentUtil.backoff(); ++ } ++ } ++ } ++ ++ public final PrioritisedExecutor.Priority getPriority() { ++ final int ret = this.getPriorityVolatile(); ++ if ((ret & PRIORITY_EXECUTED) != 0) { ++ return PrioritisedExecutor.Priority.COMPLETING; ++ } ++ if ((ret & PRIORITY_SCHEDULED) != 0) { ++ return this.getScheduledPriority(); ++ } ++ return PrioritisedExecutor.Priority.getPriority(ret); ++ } ++ ++ public final void lowerPriority(final PrioritisedExecutor.Priority priority) { ++ if (!PrioritisedExecutor.Priority.isValidPriority(priority)) { ++ throw new IllegalArgumentException("Invalid priority " + priority); ++ } ++ ++ int failures = 0; ++ for (int curr = this.getPriorityVolatile();;) { ++ if ((curr & PRIORITY_EXECUTED) != 0) { ++ return; ++ } ++ ++ if ((curr & PRIORITY_SCHEDULED) != 0) { ++ this.lowerPriorityScheduled(priority); ++ return; ++ } ++ ++ if (!priority.isLowerPriority(curr)) { ++ return; ++ } ++ ++ if (curr == (curr = this.compareAndExchangePriorityVolatile(curr, priority.priority))) { ++ return; ++ } ++ ++ // failed, retry ++ ++ ++failures; ++ for (int i = 0; i < failures; ++i) { ++ ConcurrentUtil.backoff(); ++ } ++ } ++ } ++ ++ public final void setPriority(final PrioritisedExecutor.Priority priority) { ++ if (!PrioritisedExecutor.Priority.isValidPriority(priority)) { ++ throw new IllegalArgumentException("Invalid priority " + priority); ++ } ++ ++ int failures = 0; ++ for (int curr = this.getPriorityVolatile();;) { ++ if ((curr & PRIORITY_EXECUTED) != 0) { ++ return; ++ } ++ ++ if ((curr & PRIORITY_SCHEDULED) != 0) { ++ this.setPriorityScheduled(priority); ++ return; ++ } ++ ++ if (curr == (curr = this.compareAndExchangePriorityVolatile(curr, priority.priority))) { ++ return; ++ } ++ ++ // failed, retry ++ ++ ++failures; ++ for (int i = 0; i < failures; ++i) { ++ ConcurrentUtil.backoff(); ++ } ++ } ++ } ++ ++ public final void raisePriority(final PrioritisedExecutor.Priority priority) { ++ if (!PrioritisedExecutor.Priority.isValidPriority(priority)) { ++ throw new IllegalArgumentException("Invalid priority " + priority); ++ } ++ ++ int failures = 0; ++ for (int curr = this.getPriorityVolatile();;) { ++ if ((curr & PRIORITY_EXECUTED) != 0) { ++ return; ++ } ++ ++ if ((curr & PRIORITY_SCHEDULED) != 0) { ++ this.raisePriorityScheduled(priority); ++ return; ++ } ++ ++ if (!priority.isHigherPriority(curr)) { ++ return; ++ } ++ ++ if (curr == (curr = this.compareAndExchangePriorityVolatile(curr, priority.priority))) { ++ return; ++ } ++ ++ // failed, retry ++ ++ ++failures; ++ for (int i = 0; i < failures; ++i) { ++ ConcurrentUtil.backoff(); ++ } ++ } ++ } ++ ++ protected abstract void cancelScheduled(); ++ ++ protected abstract PrioritisedExecutor.Priority getScheduledPriority(); ++ ++ protected abstract void scheduleTask(final PrioritisedExecutor.Priority priority); ++ ++ protected abstract void lowerPriorityScheduled(final PrioritisedExecutor.Priority priority); ++ ++ protected abstract void setPriorityScheduled(final PrioritisedExecutor.Priority priority); ++ ++ protected abstract void raisePriorityScheduled(final PrioritisedExecutor.Priority priority); ++} +diff --git a/src/main/java/io/papermc/paper/chunk/system/scheduling/ThreadedTicketLevelPropagator.java b/src/main/java/io/papermc/paper/chunk/system/scheduling/ThreadedTicketLevelPropagator.java +new file mode 100644 +index 0000000000000000000000000000000000000000..287240ed3b440f2f5733c368416e4276f626405d +--- /dev/null ++++ b/src/main/java/io/papermc/paper/chunk/system/scheduling/ThreadedTicketLevelPropagator.java +@@ -0,0 +1,1477 @@ ++package io.papermc.paper.chunk.system.scheduling; ++ ++import ca.spottedleaf.concurrentutil.collection.MultiThreadedQueue; ++import ca.spottedleaf.concurrentutil.lock.ReentrantAreaLock; ++import ca.spottedleaf.concurrentutil.util.ConcurrentUtil; ++import it.unimi.dsi.fastutil.HashCommon; ++import it.unimi.dsi.fastutil.longs.Long2ByteLinkedOpenHashMap; ++import it.unimi.dsi.fastutil.shorts.Short2ByteLinkedOpenHashMap; ++import it.unimi.dsi.fastutil.shorts.Short2ByteMap; ++import it.unimi.dsi.fastutil.shorts.ShortOpenHashSet; ++import java.lang.invoke.VarHandle; ++import java.util.ArrayDeque; ++import java.util.Arrays; ++import java.util.Iterator; ++import java.util.List; ++import java.util.concurrent.ConcurrentHashMap; ++import java.util.concurrent.locks.LockSupport; ++ ++public abstract class ThreadedTicketLevelPropagator { ++ ++ // sections are 64 in length ++ public static final int SECTION_SHIFT = 6; ++ public static final int SECTION_SIZE = 1 << SECTION_SHIFT; ++ private static final int LEVEL_BITS = SECTION_SHIFT; ++ private static final int LEVEL_COUNT = 1 << LEVEL_BITS; ++ private static final int MIN_SOURCE_LEVEL = 1; ++ // we limit the max source to 62 because the depropagation code _must_ attempt to depropagate ++ // a 1 level to 0; and if a source was 63 then it may cross more than 2 sections in depropagation ++ private static final int MAX_SOURCE_LEVEL = 62; ++ ++ private final UpdateQueue updateQueue; ++ private final ConcurrentHashMap<Coordinate, Section> sections = new ConcurrentHashMap<>(); ++ ++ public ThreadedTicketLevelPropagator() { ++ this.updateQueue = new UpdateQueue(); ++ } ++ ++ // must hold ticket lock for: ++ // (posX & ~(SECTION_SIZE - 1), posZ & ~(SECTION_SIZE - 1)) to (posX | (SECTION_SIZE - 1), posZ | (SECTION_SIZE - 1)) ++ public void setSource(final int posX, final int posZ, final int to) { ++ if (to < 1 || to > MAX_SOURCE_LEVEL) { ++ throw new IllegalArgumentException("Source: " + to); ++ } ++ ++ final int sectionX = posX >> SECTION_SHIFT; ++ final int sectionZ = posZ >> SECTION_SHIFT; ++ ++ final Coordinate coordinate = new Coordinate(sectionX, sectionZ); ++ Section section = this.sections.get(coordinate); ++ if (section == null) { ++ if (null != this.sections.putIfAbsent(coordinate, section = new Section(sectionX, sectionZ))) { ++ throw new IllegalStateException("Race condition while creating new section"); ++ } ++ } ++ ++ final int localIdx = (posX & (SECTION_SIZE - 1)) | ((posZ & (SECTION_SIZE - 1)) << SECTION_SHIFT); ++ final short sLocalIdx = (short)localIdx; ++ ++ final short sourceAndLevel = section.levels[localIdx]; ++ final int currentSource = (sourceAndLevel >>> 8) & 0xFF; ++ ++ if (currentSource == to) { ++ // nothing to do ++ // make sure to kill the current update, if any ++ section.queuedSources.replace(sLocalIdx, (byte)to); ++ return; ++ } ++ ++ if (section.queuedSources.put(sLocalIdx, (byte)to) == Section.NO_QUEUED_UPDATE && section.queuedSources.size() == 1) { ++ this.queueSectionUpdate(section); ++ } ++ } ++ ++ // must hold ticket lock for: ++ // (posX & ~(SECTION_SIZE - 1), posZ & ~(SECTION_SIZE - 1)) to (posX | (SECTION_SIZE - 1), posZ | (SECTION_SIZE - 1)) ++ public void removeSource(final int posX, final int posZ) { ++ final int sectionX = posX >> SECTION_SHIFT; ++ final int sectionZ = posZ >> SECTION_SHIFT; ++ ++ final Coordinate coordinate = new Coordinate(sectionX, sectionZ); ++ final Section section = this.sections.get(coordinate); ++ ++ if (section == null) { ++ return; ++ } ++ ++ final int localIdx = (posX & (SECTION_SIZE - 1)) | ((posZ & (SECTION_SIZE - 1)) << SECTION_SHIFT); ++ final short sLocalIdx = (short)localIdx; ++ ++ final int currentSource = (section.levels[localIdx] >>> 8) & 0xFF; ++ ++ if (currentSource == 0) { ++ // we use replace here so that we do not possibly multi-queue a section for an update ++ section.queuedSources.replace(sLocalIdx, (byte)0); ++ return; ++ } ++ ++ if (section.queuedSources.put(sLocalIdx, (byte)0) == Section.NO_QUEUED_UPDATE && section.queuedSources.size() == 1) { ++ this.queueSectionUpdate(section); ++ } ++ } ++ ++ private void queueSectionUpdate(final Section section) { ++ this.updateQueue.append(new UpdateQueue.UpdateQueueNode(section, null)); ++ } ++ ++ public boolean hasPendingUpdates() { ++ return !this.updateQueue.isEmpty(); ++ } ++ ++ // holds ticket lock for every chunk section represented by any position in the key set ++ // updates is modifiable and passed to processSchedulingUpdates after this call ++ protected abstract void processLevelUpdates(final Long2ByteLinkedOpenHashMap updates); ++ ++ // holds ticket lock for every chunk section represented by any position in the key set ++ // holds scheduling lock in max access radius for every position held by the ticket lock ++ // updates is cleared after this call ++ protected abstract void processSchedulingUpdates(final Long2ByteLinkedOpenHashMap updates, final List<ChunkProgressionTask> scheduledTasks, ++ final List<NewChunkHolder> changedFullStatus); ++ ++ // must hold ticket lock for every position in the sections in one radius around sectionX,sectionZ ++ public boolean performUpdate(final int sectionX, final int sectionZ, final ReentrantAreaLock schedulingLock, ++ final List<ChunkProgressionTask> scheduledTasks, final List<NewChunkHolder> changedFullStatus) { ++ if (!this.hasPendingUpdates()) { ++ return false; ++ } ++ ++ final Coordinate coordinate = new Coordinate(Coordinate.key(sectionX, sectionZ)); ++ final Section section = this.sections.get(coordinate); ++ ++ if (section == null || section.queuedSources.isEmpty()) { ++ // no section or no updates ++ return false; ++ } ++ ++ final Propagator propagator = Propagator.acquirePropagator(); ++ final boolean ret = this.performUpdate(section, null, propagator, ++ null, schedulingLock, scheduledTasks, changedFullStatus ++ ); ++ Propagator.returnPropagator(propagator); ++ return ret; ++ } ++ ++ private boolean performUpdate(final Section section, final UpdateQueue.UpdateQueueNode node, final Propagator propagator, ++ final ReentrantAreaLock ticketLock, final ReentrantAreaLock schedulingLock, ++ final List<ChunkProgressionTask> scheduledTasks, final List<NewChunkHolder> changedFullStatus) { ++ final int sectionX = section.sectionX; ++ final int sectionZ = section.sectionZ; ++ ++ final int rad1MinX = (sectionX - 1) << SECTION_SHIFT; ++ final int rad1MinZ = (sectionZ - 1) << SECTION_SHIFT; ++ final int rad1MaxX = ((sectionX + 1) << SECTION_SHIFT) | (SECTION_SIZE - 1); ++ final int rad1MaxZ = ((sectionZ + 1) << SECTION_SHIFT) | (SECTION_SIZE - 1); ++ ++ // set up encode offset first as we need to queue level changes _before_ ++ propagator.setupEncodeOffset(sectionX, sectionZ); ++ ++ final int coordinateOffset = propagator.coordinateOffset; ++ ++ final ReentrantAreaLock.Node ticketNode = ticketLock == null ? null : ticketLock.lock(rad1MinX, rad1MinZ, rad1MaxX, rad1MaxZ); ++ final boolean ret; ++ try { ++ // first, check if this update was stolen ++ if (section != this.sections.get(new Coordinate(sectionX, sectionZ))) { ++ // occurs when a stolen update deletes this section ++ // it is possible that another update is scheduled, but that one will have the correct section ++ if (node != null) { ++ this.updateQueue.remove(node); ++ } ++ return false; ++ } ++ ++ final int oldSourceSize = section.sources.size(); ++ ++ // process pending sources ++ for (final Iterator<Short2ByteMap.Entry> iterator = section.queuedSources.short2ByteEntrySet().fastIterator(); iterator.hasNext();) { ++ final Short2ByteMap.Entry entry = iterator.next(); ++ final int pos = (int)entry.getShortKey(); ++ final int posX = (pos & (SECTION_SIZE - 1)) | (sectionX << SECTION_SHIFT); ++ final int posZ = ((pos >> SECTION_SHIFT) & (SECTION_SIZE - 1)) | (sectionZ << SECTION_SHIFT); ++ final int newSource = (int)entry.getByteValue(); ++ ++ final short currentEncoded = section.levels[pos]; ++ final int currLevel = currentEncoded & 0xFF; ++ final int prevSource = (currentEncoded >>> 8) & 0xFF; ++ ++ if (prevSource == newSource) { ++ // nothing changed ++ continue; ++ } ++ ++ if ((prevSource < currLevel && newSource <= currLevel) || newSource == currLevel) { ++ // just update the source, don't need to propagate change ++ section.levels[pos] = (short)(currLevel | (newSource << 8)); ++ // level is unchanged, don't add to changed positions ++ } else { ++ // set current level and current source to new source ++ section.levels[pos] = (short)(newSource | (newSource << 8)); ++ // must add to updated positions in case this is final ++ propagator.updatedPositions.put(Coordinate.key(posX, posZ), (byte)newSource); ++ if (newSource != 0) { ++ // queue increase with new source level ++ propagator.appendToIncreaseQueue( ++ ((long)(posX + (posZ << Propagator.COORDINATE_BITS) + coordinateOffset) & ((1L << (Propagator.COORDINATE_BITS + Propagator.COORDINATE_BITS)) - 1)) | ++ ((newSource & (LEVEL_COUNT - 1L)) << (Propagator.COORDINATE_BITS + Propagator.COORDINATE_BITS)) | ++ (Propagator.ALL_DIRECTIONS_BITSET << (Propagator.COORDINATE_BITS + Propagator.COORDINATE_BITS + LEVEL_BITS)) ++ ); ++ } ++ // queue decrease with previous level ++ if (newSource < currLevel) { ++ propagator.appendToDecreaseQueue( ++ ((long)(posX + (posZ << Propagator.COORDINATE_BITS) + coordinateOffset) & ((1L << (Propagator.COORDINATE_BITS + Propagator.COORDINATE_BITS)) - 1)) | ++ ((currLevel & (LEVEL_COUNT - 1L)) << (Propagator.COORDINATE_BITS + Propagator.COORDINATE_BITS)) | ++ (Propagator.ALL_DIRECTIONS_BITSET << (Propagator.COORDINATE_BITS + Propagator.COORDINATE_BITS + LEVEL_BITS)) ++ ); ++ } ++ } ++ ++ if (newSource == 0) { ++ // prevSource != newSource, so we are removing this source ++ section.sources.remove((short)pos); ++ } else if (prevSource == 0) { ++ // prevSource != newSource, so we are adding this source ++ section.sources.add((short)pos); ++ } ++ } ++ ++ section.queuedSources.clear(); ++ ++ final int newSourceSize = section.sources.size(); ++ ++ if (oldSourceSize == 0 && newSourceSize != 0) { ++ // need to make sure the sections in 1 radius are initialised ++ for (int dz = -1; dz <= 1; ++dz) { ++ for (int dx = -1; dx <= 1; ++dx) { ++ if ((dx | dz) == 0) { ++ continue; ++ } ++ final int offX = dx + sectionX; ++ final int offZ = dz + sectionZ; ++ final Coordinate coordinate = new Coordinate(offX, offZ); ++ final Section neighbour = this.sections.computeIfAbsent(coordinate, (final Coordinate keyInMap) -> { ++ return new Section(Coordinate.x(keyInMap.key), Coordinate.z(keyInMap.key)); ++ }); ++ ++ // increase ref count ++ ++neighbour.oneRadNeighboursWithSources; ++ if (neighbour.oneRadNeighboursWithSources <= 0 || neighbour.oneRadNeighboursWithSources > 8) { ++ throw new IllegalStateException(Integer.toString(neighbour.oneRadNeighboursWithSources)); ++ } ++ } ++ } ++ } ++ ++ if (propagator.hasUpdates()) { ++ propagator.setupCaches(this, sectionX, sectionZ, 1); ++ propagator.performDecrease(); ++ // don't need try-finally, as any exception will cause the propagator to not be returned ++ propagator.destroyCaches(); ++ } ++ ++ if (newSourceSize == 0) { ++ final boolean decrementRef = oldSourceSize != 0; ++ // check for section de-init ++ for (int dz = -1; dz <= 1; ++dz) { ++ for (int dx = -1; dx <= 1; ++dx) { ++ final int offX = dx + sectionX; ++ final int offZ = dz + sectionZ; ++ final Coordinate coordinate = new Coordinate(offX, offZ); ++ final Section neighbour = this.sections.get(coordinate); ++ ++ if (neighbour == null) { ++ if (oldSourceSize == 0 && (dx | dz) != 0) { ++ // since we don't have sources, this section is allowed to null ++ continue; ++ } ++ throw new IllegalStateException("??"); ++ } ++ ++ if (decrementRef && (dx | dz) != 0) { ++ // decrease ref count, but only for neighbours ++ --neighbour.oneRadNeighboursWithSources; ++ } ++ ++ // we need to check the current section for de-init as well ++ if (neighbour.oneRadNeighboursWithSources == 0) { ++ if (neighbour.queuedSources.isEmpty() && neighbour.sources.isEmpty()) { ++ // need to de-init ++ this.sections.remove(coordinate); ++ } // else: neighbour is queued for an update, and it will de-init itself ++ } else if (neighbour.oneRadNeighboursWithSources < 0 || neighbour.oneRadNeighboursWithSources > 8) { ++ throw new IllegalStateException(Integer.toString(neighbour.oneRadNeighboursWithSources)); ++ } ++ } ++ } ++ } ++ ++ ++ ret = !propagator.updatedPositions.isEmpty(); ++ ++ if (ret) { ++ this.processLevelUpdates(propagator.updatedPositions); ++ ++ if (!propagator.updatedPositions.isEmpty()) { ++ // now we can actually update the ticket levels in the chunk holders ++ final int maxScheduleRadius = 2 * ChunkTaskScheduler.getMaxAccessRadius(); ++ ++ // allow the chunkholders to process ticket level updates without needing to acquire the schedule lock every time ++ final ReentrantAreaLock.Node schedulingNode = schedulingLock.lock( ++ rad1MinX - maxScheduleRadius, rad1MinZ - maxScheduleRadius, ++ rad1MaxX + maxScheduleRadius, rad1MaxZ + maxScheduleRadius ++ ); ++ try { ++ this.processSchedulingUpdates(propagator.updatedPositions, scheduledTasks, changedFullStatus); ++ } finally { ++ schedulingLock.unlock(schedulingNode); ++ } ++ } ++ ++ propagator.updatedPositions.clear(); ++ } ++ } finally { ++ if (ticketLock != null) { ++ ticketLock.unlock(ticketNode); ++ } ++ } ++ ++ // finished ++ if (node != null) { ++ this.updateQueue.remove(node); ++ } ++ ++ return ret; ++ } ++ ++ public boolean performUpdates(final ReentrantAreaLock ticketLock, final ReentrantAreaLock schedulingLock, ++ final List<ChunkProgressionTask> scheduledTasks, final List<NewChunkHolder> changedFullStatus) { ++ if (this.updateQueue.isEmpty()) { ++ return false; ++ } ++ ++ final long maxOrder = this.updateQueue.getLastOrder(); ++ ++ boolean updated = false; ++ Propagator propagator = null; ++ ++ for (;;) { ++ final UpdateQueue.UpdateQueueNode toUpdate = this.updateQueue.acquireNextToUpdate(maxOrder); ++ if (toUpdate == null) { ++ this.updateQueue.awaitFirst(maxOrder); ++ ++ if (!this.updateQueue.hasRemainingUpdates(maxOrder)) { ++ if (propagator != null) { ++ Propagator.returnPropagator(propagator); ++ } ++ return updated; ++ } ++ ++ continue; ++ } ++ ++ if (propagator == null) { ++ propagator = Propagator.acquirePropagator(); ++ } ++ ++ updated |= this.performUpdate(toUpdate.section, toUpdate, propagator, ticketLock, schedulingLock, scheduledTasks, changedFullStatus); ++ } ++ } ++ ++ private static final class UpdateQueue { ++ ++ private volatile UpdateQueueNode head; ++ private volatile UpdateQueueNode tail; ++ private volatile UpdateQueueNode lastUpdating; ++ ++ protected static final VarHandle HEAD_HANDLE = ConcurrentUtil.getVarHandle(UpdateQueue.class, "head", UpdateQueueNode.class); ++ protected static final VarHandle TAIL_HANDLE = ConcurrentUtil.getVarHandle(UpdateQueue.class, "tail", UpdateQueueNode.class); ++ protected static final VarHandle LAST_UPDATING = ConcurrentUtil.getVarHandle(UpdateQueue.class, "lastUpdating", UpdateQueueNode.class); ++ ++ /* head */ ++ ++ protected final void setHeadPlain(final UpdateQueueNode newHead) { ++ HEAD_HANDLE.set(this, newHead); ++ } ++ ++ protected final void setHeadOpaque(final UpdateQueueNode newHead) { ++ HEAD_HANDLE.setOpaque(this, newHead); ++ } ++ ++ protected final UpdateQueueNode getHeadPlain() { ++ return (UpdateQueueNode)HEAD_HANDLE.get(this); ++ } ++ ++ protected final UpdateQueueNode getHeadOpaque() { ++ return (UpdateQueueNode)HEAD_HANDLE.getOpaque(this); ++ } ++ ++ protected final UpdateQueueNode getHeadAcquire() { ++ return (UpdateQueueNode)HEAD_HANDLE.getAcquire(this); ++ } ++ ++ /* tail */ ++ ++ protected final void setTailPlain(final UpdateQueueNode newTail) { ++ TAIL_HANDLE.set(this, newTail); ++ } ++ ++ protected final void setTailOpaque(final UpdateQueueNode newTail) { ++ TAIL_HANDLE.setOpaque(this, newTail); ++ } ++ ++ protected final UpdateQueueNode getTailPlain() { ++ return (UpdateQueueNode)TAIL_HANDLE.get(this); ++ } ++ ++ protected final UpdateQueueNode getTailOpaque() { ++ return (UpdateQueueNode)TAIL_HANDLE.getOpaque(this); ++ } ++ ++ /* lastUpdating */ ++ ++ protected final UpdateQueueNode getLastUpdatingVolatile() { ++ return (UpdateQueueNode)LAST_UPDATING.getVolatile(this); ++ } ++ ++ protected final UpdateQueueNode compareAndExchangeLastUpdatingVolatile(final UpdateQueueNode expect, final UpdateQueueNode update) { ++ return (UpdateQueueNode)LAST_UPDATING.compareAndExchange(this, expect, update); ++ } ++ ++ public UpdateQueue() { ++ final UpdateQueueNode dummy = new UpdateQueueNode(null, null); ++ dummy.order = -1L; ++ dummy.preventAdds(); ++ ++ this.setHeadPlain(dummy); ++ this.setTailPlain(dummy); ++ } ++ ++ public boolean isEmpty() { ++ return this.peek() == null; ++ } ++ ++ public boolean hasRemainingUpdates(final long maxUpdate) { ++ final UpdateQueueNode node = this.peek(); ++ return node != null && node.order <= maxUpdate; ++ } ++ ++ public long getLastOrder() { ++ for (UpdateQueueNode tail = this.getTailOpaque(), curr = tail;;) { ++ final UpdateQueueNode next = curr.getNextVolatile(); ++ if (next == null) { ++ // try to update stale tail ++ if (this.getTailOpaque() == tail && curr != tail) { ++ this.setTailOpaque(curr); ++ } ++ return curr.order; ++ } ++ curr = next; ++ } ++ } ++ ++ public UpdateQueueNode acquireNextToUpdate(final long maxOrder) { ++ int failures = 0; ++ for (UpdateQueueNode prev = this.getLastUpdatingVolatile();;) { ++ UpdateQueueNode next = prev == null ? this.peek() : prev.next; ++ ++ if (next == null || next.order > maxOrder) { ++ return null; ++ } ++ ++ for (int i = 0; i < failures; ++i) { ++ ConcurrentUtil.backoff(); ++ } ++ ++ if (prev == (prev = this.compareAndExchangeLastUpdatingVolatile(prev, next))) { ++ return next; ++ } ++ ++ ++failures; ++ } ++ } ++ ++ public void awaitFirst(final long maxOrder) { ++ final UpdateQueueNode earliest = this.peek(); ++ if (earliest == null || earliest.order > maxOrder) { ++ return; ++ } ++ ++ final Thread currThread = Thread.currentThread(); ++ // we do not use add-blocking because we use the nullability of the section to block ++ // remove() does not begin to poll from the wait queue until the section is null'd, ++ // and so provided we check the nullability before parking there is no ordering of these operations ++ // such that remove() finishes polling from the wait queue while section is not null ++ earliest.add(currThread); ++ ++ // wait until completed ++ while (earliest.getSectionVolatile() != null) { ++ LockSupport.park(); ++ } ++ } ++ ++ public UpdateQueueNode peek() { ++ for (UpdateQueueNode head = this.getHeadOpaque(), curr = head;;) { ++ final UpdateQueueNode next = curr.getNextVolatile(); ++ final Section element = curr.getSectionVolatile(); /* Likely in sync */ ++ ++ if (element != null) { ++ if (this.getHeadOpaque() == head && curr != head) { ++ this.setHeadOpaque(curr); ++ } ++ return curr; ++ } ++ ++ if (next == null) { ++ if (this.getHeadOpaque() == head && curr != head) { ++ this.setHeadOpaque(curr); ++ } ++ return null; ++ } ++ curr = next; ++ } ++ } ++ ++ public void remove(final UpdateQueueNode node) { ++ // mark as removed ++ node.setSectionVolatile(null); ++ ++ // use peek to advance head ++ this.peek(); ++ ++ // unpark any waiters / block the wait queue ++ Thread unpark; ++ while ((unpark = node.poll()) != null) { ++ LockSupport.unpark(unpark); ++ } ++ } ++ ++ public void append(final UpdateQueueNode node) { ++ int failures = 0; ++ ++ for (UpdateQueueNode currTail = this.getTailOpaque(), curr = currTail;;) { ++ /* It has been experimentally shown that placing the read before the backoff results in significantly greater performance */ ++ /* It is likely due to a cache miss caused by another write to the next field */ ++ final UpdateQueueNode next = curr.getNextVolatile(); ++ ++ for (int i = 0; i < failures; ++i) { ++ ConcurrentUtil.backoff(); ++ } ++ ++ if (next == null) { ++ node.order = curr.order + 1L; ++ final UpdateQueueNode compared = curr.compareExchangeNextVolatile(null, node); ++ ++ if (compared == null) { ++ /* Added */ ++ /* Avoid CASing on tail more than we need to */ ++ /* CAS to avoid setting an out-of-date tail */ ++ if (this.getTailOpaque() == currTail) { ++ this.setTailOpaque(node); ++ } ++ return; ++ } ++ ++ ++failures; ++ curr = compared; ++ continue; ++ } ++ ++ if (curr == currTail) { ++ /* Tail is likely not up-to-date */ ++ curr = next; ++ } else { ++ /* Try to update to tail */ ++ if (currTail == (currTail = this.getTailOpaque())) { ++ curr = next; ++ } else { ++ curr = currTail; ++ } ++ } ++ } ++ } ++ ++ // each node also represents a set of waiters, represented by the MTQ ++ // if the queue is add-blocked, then the update is complete ++ private static final class UpdateQueueNode extends MultiThreadedQueue<Thread> { ++ private long order; ++ private Section section; ++ private volatile UpdateQueueNode next; ++ ++ protected static final VarHandle SECTION_HANDLE = ConcurrentUtil.getVarHandle(UpdateQueueNode.class, "section", Section.class); ++ protected static final VarHandle NEXT_HANDLE = ConcurrentUtil.getVarHandle(UpdateQueueNode.class, "next", UpdateQueueNode.class); ++ ++ public UpdateQueueNode(final Section section, final UpdateQueueNode next) { ++ SECTION_HANDLE.set(this, section); ++ NEXT_HANDLE.set(this, next); ++ } ++ ++ /* section */ ++ ++ protected final Section getSectionPlain() { ++ return (Section)SECTION_HANDLE.get(this); ++ } ++ ++ protected final Section getSectionVolatile() { ++ return (Section)SECTION_HANDLE.getVolatile(this); ++ } ++ ++ protected final void setSectionPlain(final Section update) { ++ SECTION_HANDLE.set(this, update); ++ } ++ ++ protected final void setSectionOpaque(final Section update) { ++ SECTION_HANDLE.setOpaque(this, update); ++ } ++ ++ protected final void setSectionVolatile(final Section update) { ++ SECTION_HANDLE.setVolatile(this, update); ++ } ++ ++ protected final Section getAndSetSectionVolatile(final Section update) { ++ return (Section)SECTION_HANDLE.getAndSet(this, update); ++ } ++ ++ protected final Section compareExchangeSectionVolatile(final Section expect, final Section update) { ++ return (Section)SECTION_HANDLE.compareAndExchange(this, expect, update); ++ } ++ ++ /* next */ ++ ++ protected final UpdateQueueNode getNextPlain() { ++ return (UpdateQueueNode)NEXT_HANDLE.get(this); ++ } ++ ++ protected final UpdateQueueNode getNextOpaque() { ++ return (UpdateQueueNode)NEXT_HANDLE.getOpaque(this); ++ } ++ ++ protected final UpdateQueueNode getNextAcquire() { ++ return (UpdateQueueNode)NEXT_HANDLE.getAcquire(this); ++ } ++ ++ protected final UpdateQueueNode getNextVolatile() { ++ return (UpdateQueueNode)NEXT_HANDLE.getVolatile(this); ++ } ++ ++ protected final void setNextPlain(final UpdateQueueNode next) { ++ NEXT_HANDLE.set(this, next); ++ } ++ ++ protected final void setNextVolatile(final UpdateQueueNode next) { ++ NEXT_HANDLE.setVolatile(this, next); ++ } ++ ++ protected final UpdateQueueNode compareExchangeNextVolatile(final UpdateQueueNode expect, final UpdateQueueNode set) { ++ return (UpdateQueueNode)NEXT_HANDLE.compareAndExchange(this, expect, set); ++ } ++ } ++ } ++ ++ private static final class Section { ++ ++ // upper 8 bits: sources, lower 8 bits: level ++ // if we REALLY wanted to get crazy, we could make the increase propagator use MethodHandles#byteArrayViewVarHandle ++ // to read and write the lower 8 bits of this array directly rather than reading, updating the bits, then writing back. ++ private final short[] levels = new short[SECTION_SIZE * SECTION_SIZE]; ++ // set of local positions that represent sources ++ private final ShortOpenHashSet sources = new ShortOpenHashSet(); ++ // map of local index to new source level ++ // the source level _cannot_ be updated in the backing storage immediately since the update ++ private static final byte NO_QUEUED_UPDATE = (byte)-1; ++ private final Short2ByteLinkedOpenHashMap queuedSources = new Short2ByteLinkedOpenHashMap(); ++ { ++ this.queuedSources.defaultReturnValue(NO_QUEUED_UPDATE); ++ } ++ private int oneRadNeighboursWithSources = 0; ++ ++ public final int sectionX; ++ public final int sectionZ; ++ ++ public Section(final int sectionX, final int sectionZ) { ++ this.sectionX = sectionX; ++ this.sectionZ = sectionZ; ++ } ++ ++ public boolean isZero() { ++ for (final short val : this.levels) { ++ if (val != 0) { ++ return false; ++ } ++ } ++ return true; ++ } ++ ++ @Override ++ public String toString() { ++ final StringBuilder ret = new StringBuilder(); ++ ++ for (int x = 0; x < SECTION_SIZE; ++x) { ++ ret.append("levels x=").append(x).append("\n"); ++ for (int z = 0; z < SECTION_SIZE; ++z) { ++ final short v = this.levels[x | (z << SECTION_SHIFT)]; ++ ret.append(v & 0xFF).append("."); ++ } ++ ret.append("\n"); ++ ret.append("sources x=").append(x).append("\n"); ++ for (int z = 0; z < SECTION_SIZE; ++z) { ++ final short v = this.levels[x | (z << SECTION_SHIFT)]; ++ ret.append((v >>> 8) & 0xFF).append("."); ++ } ++ ret.append("\n\n"); ++ } ++ ++ return ret.toString(); ++ } ++ } ++ ++ ++ private static final class Propagator { ++ ++ private static final ArrayDeque<Propagator> CACHED_PROPAGATORS = new ArrayDeque<>(); ++ private static final int MAX_PROPAGATORS = Runtime.getRuntime().availableProcessors() * 2; ++ ++ private static Propagator acquirePropagator() { ++ synchronized (CACHED_PROPAGATORS) { ++ final Propagator ret = CACHED_PROPAGATORS.pollFirst(); ++ if (ret != null) { ++ return ret; ++ } ++ } ++ return new Propagator(); ++ } ++ ++ private static void returnPropagator(final Propagator propagator) { ++ synchronized (CACHED_PROPAGATORS) { ++ if (CACHED_PROPAGATORS.size() < MAX_PROPAGATORS) { ++ CACHED_PROPAGATORS.add(propagator); ++ } ++ } ++ } ++ ++ private static final int SECTION_RADIUS = 2; ++ private static final int SECTION_CACHE_WIDTH = 2 * SECTION_RADIUS + 1; ++ // minimum number of bits to represent [0, SECTION_SIZE * SECTION_CACHE_WIDTH) ++ private static final int COORDINATE_BITS = 9; ++ private static final int COORDINATE_SIZE = 1 << COORDINATE_BITS; ++ static { ++ if ((SECTION_SIZE * SECTION_CACHE_WIDTH) > (1 << COORDINATE_BITS)) { ++ throw new IllegalStateException("Adjust COORDINATE_BITS"); ++ } ++ } ++ // index = x + (z * SECTION_CACHE_WIDTH) ++ // (this requires x >= 0 and z >= 0) ++ private final Section[] sections = new Section[SECTION_CACHE_WIDTH * SECTION_CACHE_WIDTH]; ++ ++ private int encodeOffsetX; ++ private int encodeOffsetZ; ++ ++ private int coordinateOffset; ++ ++ private int encodeSectionOffsetX; ++ private int encodeSectionOffsetZ; ++ ++ private int sectionIndexOffset; ++ ++ public final boolean hasUpdates() { ++ return this.decreaseQueueInitialLength != 0 || this.increaseQueueInitialLength != 0; ++ } ++ ++ protected final void setupEncodeOffset(final int centerSectionX, final int centerSectionZ) { ++ final int maxCoordinate = (SECTION_RADIUS * SECTION_SIZE - 1); ++ // must have that encoded >= 0 ++ // coordinates can range from [-maxCoordinate + centerSection*SECTION_SIZE, maxCoordinate + centerSection*SECTION_SIZE] ++ // we want a range of [0, maxCoordinate*2] ++ // so, 0 = -maxCoordinate + centerSection*SECTION_SIZE + offset ++ this.encodeOffsetX = maxCoordinate - (centerSectionX << SECTION_SHIFT); ++ this.encodeOffsetZ = maxCoordinate - (centerSectionZ << SECTION_SHIFT); ++ ++ // encoded coordinates range from [0, SECTION_SIZE * SECTION_CACHE_WIDTH) ++ // coordinate index = (x + encodeOffsetX) + ((z + encodeOffsetZ) << COORDINATE_BITS) ++ this.coordinateOffset = this.encodeOffsetX + (this.encodeOffsetZ << COORDINATE_BITS); ++ ++ // need encoded values to be >= 0 ++ // so, 0 = (-SECTION_RADIUS + centerSectionX) + encodeOffset ++ this.encodeSectionOffsetX = SECTION_RADIUS - centerSectionX; ++ this.encodeSectionOffsetZ = SECTION_RADIUS - centerSectionZ; ++ ++ // section index = (secX + encodeSectionOffsetX) + ((secZ + encodeSectionOffsetZ) * SECTION_CACHE_WIDTH) ++ this.sectionIndexOffset = this.encodeSectionOffsetX + (this.encodeSectionOffsetZ * SECTION_CACHE_WIDTH); ++ } ++ ++ // must hold ticket lock for (centerSectionX,centerSectionZ) in radius rad ++ // must call setupEncodeOffset ++ protected final void setupCaches(final ThreadedTicketLevelPropagator propagator, ++ final int centerSectionX, final int centerSectionZ, ++ final int rad) { ++ for (int dz = -rad; dz <= rad; ++dz) { ++ for (int dx = -rad; dx <= rad; ++dx) { ++ final int sectionX = centerSectionX + dx; ++ final int sectionZ = centerSectionZ + dz; ++ final Coordinate coordinate = new Coordinate(sectionX, sectionZ); ++ final Section section = propagator.sections.get(coordinate); ++ ++ if (section == null) { ++ throw new IllegalStateException("Section at " + coordinate + " should not be null"); ++ } ++ ++ this.setSectionInCache(sectionX, sectionZ, section); ++ } ++ } ++ } ++ ++ protected final void setSectionInCache(final int sectionX, final int sectionZ, final Section section) { ++ this.sections[sectionX + SECTION_CACHE_WIDTH*sectionZ + this.sectionIndexOffset] = section; ++ } ++ ++ protected final Section getSection(final int sectionX, final int sectionZ) { ++ return this.sections[sectionX + SECTION_CACHE_WIDTH*sectionZ + this.sectionIndexOffset]; ++ } ++ ++ protected final int getLevel(final int posX, final int posZ) { ++ final Section section = this.sections[(posX >> SECTION_SHIFT) + SECTION_CACHE_WIDTH*(posZ >> SECTION_SHIFT) + this.sectionIndexOffset]; ++ if (section != null) { ++ return (int)section.levels[(posX & (SECTION_SIZE - 1)) | ((posZ & (SECTION_SIZE - 1)) << SECTION_SHIFT)] & 0xFF; ++ } ++ ++ return 0; ++ } ++ ++ protected final void setLevel(final int posX, final int posZ, final int to) { ++ final Section section = this.sections[(posX >> SECTION_SHIFT) + SECTION_CACHE_WIDTH*(posZ >> SECTION_SHIFT) + this.sectionIndexOffset]; ++ if (section != null) { ++ final int index = (posX & (SECTION_SIZE - 1)) | ((posZ & (SECTION_SIZE - 1)) << SECTION_SHIFT); ++ final short level = section.levels[index]; ++ section.levels[index] = (short)((level & ~0xFF) | (to & 0xFF)); ++ this.updatedPositions.put(Coordinate.key(posX, posZ), (byte)to); ++ } ++ } ++ ++ protected final void destroyCaches() { ++ Arrays.fill(this.sections, null); ++ } ++ ++ // contains: ++ // lower (COORDINATE_BITS(9) + COORDINATE_BITS(9) = 18) bits encoded position: (x | (z << COORDINATE_BITS)) ++ // next LEVEL_BITS (6) bits: propagated level [0, 63] ++ // propagation directions bitset (16 bits): ++ protected static final long ALL_DIRECTIONS_BITSET = ( ++ // z = -1 ++ (1L << ((1 - 1) | ((1 - 1) << 2))) | ++ (1L << ((1 + 0) | ((1 - 1) << 2))) | ++ (1L << ((1 + 1) | ((1 - 1) << 2))) | ++ ++ // z = 0 ++ (1L << ((1 - 1) | ((1 + 0) << 2))) | ++ //(1L << ((1 + 0) | ((1 + 0) << 2))) | // exclude (0,0) ++ (1L << ((1 + 1) | ((1 + 0) << 2))) | ++ ++ // z = 1 ++ (1L << ((1 - 1) | ((1 + 1) << 2))) | ++ (1L << ((1 + 0) | ((1 + 1) << 2))) | ++ (1L << ((1 + 1) | ((1 + 1) << 2))) ++ ); ++ ++ private void ex(int bitset) { ++ for (int i = 0, len = Integer.bitCount(bitset); i < len; ++i) { ++ final int set = Integer.numberOfTrailingZeros(bitset); ++ final int tailingBit = (-bitset) & bitset; ++ // XOR to remove the trailing bit ++ bitset ^= tailingBit; ++ ++ // the encoded value set is (x_val) | (z_val << 2), totaling 4 bits ++ // thus, the bitset is 16 bits wide where each one represents a direction to propagate and the ++ // index of the set bit is the encoded value ++ // the encoded coordinate has 3 valid states: ++ // 0b00 (0) -> -1 ++ // 0b01 (1) -> 0 ++ // 0b10 (2) -> 1 ++ // the decode operation then is val - 1, and the encode operation is val + 1 ++ final int xOff = (set & 3) - 1; ++ final int zOff = ((set >>> 2) & 3) - 1; ++ System.out.println("Encoded: (" + xOff + "," + zOff + ")"); ++ } ++ } ++ ++ private void ch(long bs, int shift) { ++ int bitset = (int)(bs >>> shift); ++ for (int i = 0, len = Integer.bitCount(bitset); i < len; ++i) { ++ final int set = Integer.numberOfTrailingZeros(bitset); ++ final int tailingBit = (-bitset) & bitset; ++ // XOR to remove the trailing bit ++ bitset ^= tailingBit; ++ ++ // the encoded value set is (x_val) | (z_val << 2), totaling 4 bits ++ // thus, the bitset is 16 bits wide where each one represents a direction to propagate and the ++ // index of the set bit is the encoded value ++ // the encoded coordinate has 3 valid states: ++ // 0b00 (0) -> -1 ++ // 0b01 (1) -> 0 ++ // 0b10 (2) -> 1 ++ // the decode operation then is val - 1, and the encode operation is val + 1 ++ final int xOff = (set & 3) - 1; ++ final int zOff = ((set >>> 2) & 3) - 1; ++ if (Math.abs(xOff) > 1 || Math.abs(zOff) > 1 || (xOff | zOff) == 0) { ++ throw new IllegalStateException(); ++ } ++ } ++ } ++ ++ // whether the increase propagator needs to write the propagated level to the position, used to avoid cascading ++ // updates for sources ++ protected static final long FLAG_WRITE_LEVEL = Long.MIN_VALUE >>> 1; ++ // whether the propagation needs to check if its current level is equal to the expected level ++ // used only in increase propagation ++ protected static final long FLAG_RECHECK_LEVEL = Long.MIN_VALUE >>> 0; ++ ++ protected long[] increaseQueue = new long[SECTION_SIZE * SECTION_SIZE * 2]; ++ protected int increaseQueueInitialLength; ++ protected long[] decreaseQueue = new long[SECTION_SIZE * SECTION_SIZE * 2]; ++ protected int decreaseQueueInitialLength; ++ ++ protected final Long2ByteLinkedOpenHashMap updatedPositions = new Long2ByteLinkedOpenHashMap(); ++ ++ protected final long[] resizeIncreaseQueue() { ++ return this.increaseQueue = Arrays.copyOf(this.increaseQueue, this.increaseQueue.length * 2); ++ } ++ ++ protected final long[] resizeDecreaseQueue() { ++ return this.decreaseQueue = Arrays.copyOf(this.decreaseQueue, this.decreaseQueue.length * 2); ++ } ++ ++ protected final void appendToIncreaseQueue(final long value) { ++ final int idx = this.increaseQueueInitialLength++; ++ long[] queue = this.increaseQueue; ++ if (idx >= queue.length) { ++ queue = this.resizeIncreaseQueue(); ++ queue[idx] = value; ++ return; ++ } else { ++ queue[idx] = value; ++ return; ++ } ++ } ++ ++ protected final void appendToDecreaseQueue(final long value) { ++ final int idx = this.decreaseQueueInitialLength++; ++ long[] queue = this.decreaseQueue; ++ if (idx >= queue.length) { ++ queue = this.resizeDecreaseQueue(); ++ queue[idx] = value; ++ return; ++ } else { ++ queue[idx] = value; ++ return; ++ } ++ } ++ ++ protected final void performIncrease() { ++ long[] queue = this.increaseQueue; ++ int queueReadIndex = 0; ++ int queueLength = this.increaseQueueInitialLength; ++ this.increaseQueueInitialLength = 0; ++ final int decodeOffsetX = -this.encodeOffsetX; ++ final int decodeOffsetZ = -this.encodeOffsetZ; ++ final int encodeOffset = this.coordinateOffset; ++ final int sectionOffset = this.sectionIndexOffset; ++ ++ final Long2ByteLinkedOpenHashMap updatedPositions = this.updatedPositions; ++ ++ while (queueReadIndex < queueLength) { ++ final long queueValue = queue[queueReadIndex++]; ++ ++ final int posX = ((int)queueValue & (COORDINATE_SIZE - 1)) + decodeOffsetX; ++ final int posZ = (((int)queueValue >>> COORDINATE_BITS) & (COORDINATE_SIZE - 1)) + decodeOffsetZ; ++ final int propagatedLevel = ((int)queueValue >>> (COORDINATE_BITS + COORDINATE_BITS)) & (LEVEL_COUNT - 1); ++ // note: the above code requires coordinate bits * 2 < 32 ++ // bitset is 16 bits ++ int propagateDirectionBitset = (int)(queueValue >>> (COORDINATE_BITS + COORDINATE_BITS + LEVEL_BITS)) & ((1 << 16) - 1); ++ ++ if ((queueValue & FLAG_RECHECK_LEVEL) != 0L) { ++ if (this.getLevel(posX, posZ) != propagatedLevel) { ++ // not at the level we expect, so something changed. ++ continue; ++ } ++ } else if ((queueValue & FLAG_WRITE_LEVEL) != 0L) { ++ // these are used to restore sources after a propagation decrease ++ this.setLevel(posX, posZ, propagatedLevel); ++ } ++ ++ // this bitset represents the values that we have not propagated to ++ // this bitset lets us determine what directions the neighbours we set should propagate to, in most cases ++ // significantly reducing the total number of ops ++ // since we propagate in a 1 radius, we need a 2 radius bitset to hold all possible values we would possibly need ++ // but if we use only 5x5 bits, then we need to use div/mod to retrieve coordinates from the bitset, so instead ++ // we use an 8x8 bitset and luckily that can be fit into only one long value (64 bits) ++ // to make things easy, we use positions [0, 4] in the bitset, with current position being 2 ++ // index = x | (z << 3) ++ ++ // to start, we eliminate everything 1 radius from the current position as the previous propagator ++ // must guarantee that either we propagate everything in 1 radius or we partially propagate for 1 radius ++ // but the rest not propagated are already handled ++ long currentPropagation = ~( ++ // z = -1 ++ (1L << ((2 - 1) | ((2 - 1) << 3))) | ++ (1L << ((2 + 0) | ((2 - 1) << 3))) | ++ (1L << ((2 + 1) | ((2 - 1) << 3))) | ++ ++ // z = 0 ++ (1L << ((2 - 1) | ((2 + 0) << 3))) | ++ (1L << ((2 + 0) | ((2 + 0) << 3))) | ++ (1L << ((2 + 1) | ((2 + 0) << 3))) | ++ ++ // z = 1 ++ (1L << ((2 - 1) | ((2 + 1) << 3))) | ++ (1L << ((2 + 0) | ((2 + 1) << 3))) | ++ (1L << ((2 + 1) | ((2 + 1) << 3))) ++ ); ++ ++ final int toPropagate = propagatedLevel - 1; ++ ++ // we could use while (propagateDirectionBitset != 0), but it's not a predictable branch. By counting ++ // the bits, the cpu loop predictor should perfectly predict the loop. ++ for (int l = 0, len = Integer.bitCount(propagateDirectionBitset); l < len; ++l) { ++ final int set = Integer.numberOfTrailingZeros(propagateDirectionBitset); ++ final int tailingBit = (-propagateDirectionBitset) & propagateDirectionBitset; ++ propagateDirectionBitset ^= tailingBit; ++ ++ // pDecode is from [0, 2], and 1 must be subtracted to fully decode the offset ++ // it has been split to save some cycles via parallelism ++ final int pDecodeX = (set & 3); ++ final int pDecodeZ = ((set >>> 2) & 3); ++ ++ // re-ordered -1 on the position decode into pos - 1 to occur in parallel with determining pDecodeX ++ final int offX = (posX - 1) + pDecodeX; ++ final int offZ = (posZ - 1) + pDecodeZ; ++ ++ final int sectionIndex = (offX >> SECTION_SHIFT) + ((offZ >> SECTION_SHIFT) * SECTION_CACHE_WIDTH) + sectionOffset; ++ final int localIndex = (offX & (SECTION_SIZE - 1)) | ((offZ & (SECTION_SIZE - 1)) << SECTION_SHIFT); ++ ++ // to retrieve a set of bits from a long value: (n_bitmask << (nstartidx)) & bitset ++ // bitset idx = x | (z << 3) ++ ++ // read three bits, so we need 7L ++ // note that generally: off - pos = (pos - 1) + pDecode - pos = pDecode - 1 ++ // nstartidx1 = x rel -1 for z rel -1 ++ // = (offX - posX - 1 + 2) | ((offZ - posZ - 1 + 2) << 3) ++ // = (pDecodeX - 1 - 1 + 2) | ((pDecodeZ - 1 - 1 + 2) << 3) ++ // = pDecodeX | (pDecodeZ << 3) = start ++ final int start = pDecodeX | (pDecodeZ << 3); ++ final long bitsetLine1 = currentPropagation & (7L << (start)); ++ ++ // nstartidx2 = x rel -1 for z rel 0 = line after line1, so we can just add 8 (row length of bitset) ++ final long bitsetLine2 = currentPropagation & (7L << (start + 8)); ++ ++ // nstartidx2 = x rel -1 for z rel 0 = line after line2, so we can just add 8 (row length of bitset) ++ final long bitsetLine3 = currentPropagation & (7L << (start + (8 + 8))); ++ ++ // remove ("take") lines from bitset ++ currentPropagation ^= (bitsetLine1 | bitsetLine2 | bitsetLine3); ++ ++ // now try to propagate ++ final Section section = this.sections[sectionIndex]; ++ ++ // lower 8 bits are current level, next upper 7 bits are source level, next 1 bit is updated source flag ++ final short currentStoredLevel = section.levels[localIndex]; ++ final int currentLevel = currentStoredLevel & 0xFF; ++ ++ if (currentLevel >= toPropagate) { ++ continue; // already at the level we want ++ } ++ ++ // update level ++ section.levels[localIndex] = (short)((currentStoredLevel & ~0xFF) | (toPropagate & 0xFF)); ++ updatedPositions.putAndMoveToLast(Coordinate.key(offX, offZ), (byte)toPropagate); ++ ++ // queue next ++ if (toPropagate > 1) { ++ // now combine into one bitset to pass to child ++ // the child bitset is 4x4, so we just shift each line by 4 ++ // add the propagation bitset offset to each line to make it easy to OR it into the propagation queue value ++ final long childPropagation = ++ ((bitsetLine1 >>> (start)) << (COORDINATE_BITS + COORDINATE_BITS + LEVEL_BITS)) | // z = -1 ++ ((bitsetLine2 >>> (start + 8)) << (4 + COORDINATE_BITS + COORDINATE_BITS + LEVEL_BITS)) | // z = 0 ++ ((bitsetLine3 >>> (start + (8 + 8))) << (4 + 4 + COORDINATE_BITS + COORDINATE_BITS + LEVEL_BITS)); // z = 1 ++ ++ // don't queue update if toPropagate cannot propagate anything to neighbours ++ // (for increase, propagating 0 to neighbours is useless) ++ if (queueLength >= queue.length) { ++ queue = this.resizeIncreaseQueue(); ++ } ++ queue[queueLength++] = ++ ((long)(offX + (offZ << COORDINATE_BITS) + encodeOffset) & ((1L << (COORDINATE_BITS + COORDINATE_BITS)) - 1)) | ++ ((toPropagate & (LEVEL_COUNT - 1L)) << (COORDINATE_BITS + COORDINATE_BITS)) | ++ childPropagation; //(ALL_DIRECTIONS_BITSET << (COORDINATE_BITS + COORDINATE_BITS + LEVEL_BITS)); ++ continue; ++ } ++ continue; ++ } ++ } ++ } ++ ++ protected final void performDecrease() { ++ long[] queue = this.decreaseQueue; ++ long[] increaseQueue = this.increaseQueue; ++ int queueReadIndex = 0; ++ int queueLength = this.decreaseQueueInitialLength; ++ this.decreaseQueueInitialLength = 0; ++ int increaseQueueLength = this.increaseQueueInitialLength; ++ final int decodeOffsetX = -this.encodeOffsetX; ++ final int decodeOffsetZ = -this.encodeOffsetZ; ++ final int encodeOffset = this.coordinateOffset; ++ final int sectionOffset = this.sectionIndexOffset; ++ ++ final Long2ByteLinkedOpenHashMap updatedPositions = this.updatedPositions; ++ ++ while (queueReadIndex < queueLength) { ++ final long queueValue = queue[queueReadIndex++]; ++ ++ final int posX = ((int)queueValue & (COORDINATE_SIZE - 1)) + decodeOffsetX; ++ final int posZ = (((int)queueValue >>> COORDINATE_BITS) & (COORDINATE_SIZE - 1)) + decodeOffsetZ; ++ final int propagatedLevel = ((int)queueValue >>> (COORDINATE_BITS + COORDINATE_BITS)) & (LEVEL_COUNT - 1); ++ // note: the above code requires coordinate bits * 2 < 32 ++ // bitset is 16 bits ++ int propagateDirectionBitset = (int)(queueValue >>> (COORDINATE_BITS + COORDINATE_BITS + LEVEL_BITS)) & ((1 << 16) - 1); ++ ++ // this bitset represents the values that we have not propagated to ++ // this bitset lets us determine what directions the neighbours we set should propagate to, in most cases ++ // significantly reducing the total number of ops ++ // since we propagate in a 1 radius, we need a 2 radius bitset to hold all possible values we would possibly need ++ // but if we use only 5x5 bits, then we need to use div/mod to retrieve coordinates from the bitset, so instead ++ // we use an 8x8 bitset and luckily that can be fit into only one long value (64 bits) ++ // to make things easy, we use positions [0, 4] in the bitset, with current position being 2 ++ // index = x | (z << 3) ++ ++ // to start, we eliminate everything 1 radius from the current position as the previous propagator ++ // must guarantee that either we propagate everything in 1 radius or we partially propagate for 1 radius ++ // but the rest not propagated are already handled ++ long currentPropagation = ~( ++ // z = -1 ++ (1L << ((2 - 1) | ((2 - 1) << 3))) | ++ (1L << ((2 + 0) | ((2 - 1) << 3))) | ++ (1L << ((2 + 1) | ((2 - 1) << 3))) | ++ ++ // z = 0 ++ (1L << ((2 - 1) | ((2 + 0) << 3))) | ++ (1L << ((2 + 0) | ((2 + 0) << 3))) | ++ (1L << ((2 + 1) | ((2 + 0) << 3))) | ++ ++ // z = 1 ++ (1L << ((2 - 1) | ((2 + 1) << 3))) | ++ (1L << ((2 + 0) | ((2 + 1) << 3))) | ++ (1L << ((2 + 1) | ((2 + 1) << 3))) ++ ); ++ ++ final int toPropagate = propagatedLevel - 1; ++ ++ // we could use while (propagateDirectionBitset != 0), but it's not a predictable branch. By counting ++ // the bits, the cpu loop predictor should perfectly predict the loop. ++ for (int l = 0, len = Integer.bitCount(propagateDirectionBitset); l < len; ++l) { ++ final int set = Integer.numberOfTrailingZeros(propagateDirectionBitset); ++ final int tailingBit = (-propagateDirectionBitset) & propagateDirectionBitset; ++ propagateDirectionBitset ^= tailingBit; ++ ++ ++ // pDecode is from [0, 2], and 1 must be subtracted to fully decode the offset ++ // it has been split to save some cycles via parallelism ++ final int pDecodeX = (set & 3); ++ final int pDecodeZ = ((set >>> 2) & 3); ++ ++ // re-ordered -1 on the position decode into pos - 1 to occur in parallel with determining pDecodeX ++ final int offX = (posX - 1) + pDecodeX; ++ final int offZ = (posZ - 1) + pDecodeZ; ++ ++ final int sectionIndex = (offX >> SECTION_SHIFT) + ((offZ >> SECTION_SHIFT) * SECTION_CACHE_WIDTH) + sectionOffset; ++ final int localIndex = (offX & (SECTION_SIZE - 1)) | ((offZ & (SECTION_SIZE - 1)) << SECTION_SHIFT); ++ ++ // to retrieve a set of bits from a long value: (n_bitmask << (nstartidx)) & bitset ++ // bitset idx = x | (z << 3) ++ ++ // read three bits, so we need 7L ++ // note that generally: off - pos = (pos - 1) + pDecode - pos = pDecode - 1 ++ // nstartidx1 = x rel -1 for z rel -1 ++ // = (offX - posX - 1 + 2) | ((offZ - posZ - 1 + 2) << 3) ++ // = (pDecodeX - 1 - 1 + 2) | ((pDecodeZ - 1 - 1 + 2) << 3) ++ // = pDecodeX | (pDecodeZ << 3) = start ++ final int start = pDecodeX | (pDecodeZ << 3); ++ final long bitsetLine1 = currentPropagation & (7L << (start)); ++ ++ // nstartidx2 = x rel -1 for z rel 0 = line after line1, so we can just add 8 (row length of bitset) ++ final long bitsetLine2 = currentPropagation & (7L << (start + 8)); ++ ++ // nstartidx2 = x rel -1 for z rel 0 = line after line2, so we can just add 8 (row length of bitset) ++ final long bitsetLine3 = currentPropagation & (7L << (start + (8 + 8))); ++ ++ // now try to propagate ++ final Section section = this.sections[sectionIndex]; ++ ++ // lower 8 bits are current level, next upper 7 bits are source level, next 1 bit is updated source flag ++ final short currentStoredLevel = section.levels[localIndex]; ++ final int currentLevel = currentStoredLevel & 0xFF; ++ final int sourceLevel = (currentStoredLevel >>> 8) & 0xFF; ++ ++ if (currentLevel == 0) { ++ continue; // already at the level we want ++ } ++ ++ if (currentLevel > toPropagate) { ++ // it looks like another source propagated here, so re-propagate it ++ if (increaseQueueLength >= increaseQueue.length) { ++ increaseQueue = this.resizeIncreaseQueue(); ++ } ++ increaseQueue[increaseQueueLength++] = ++ ((long)(offX + (offZ << COORDINATE_BITS) + encodeOffset) & ((1L << (COORDINATE_BITS + COORDINATE_BITS)) - 1)) | ++ ((currentLevel & (LEVEL_COUNT - 1L)) << (COORDINATE_BITS + COORDINATE_BITS)) | ++ (FLAG_RECHECK_LEVEL | (ALL_DIRECTIONS_BITSET << (COORDINATE_BITS + COORDINATE_BITS + LEVEL_BITS))); ++ continue; ++ } ++ ++ // remove ("take") lines from bitset ++ // can't do this during decrease, TODO WHY? ++ //currentPropagation ^= (bitsetLine1 | bitsetLine2 | bitsetLine3); ++ ++ // update level ++ section.levels[localIndex] = (short)((currentStoredLevel & ~0xFF)); ++ updatedPositions.putAndMoveToLast(Coordinate.key(offX, offZ), (byte)0); ++ ++ if (sourceLevel != 0) { ++ // re-propagate source ++ // note: do not set recheck level, or else the propagation will fail ++ if (increaseQueueLength >= increaseQueue.length) { ++ increaseQueue = this.resizeIncreaseQueue(); ++ } ++ increaseQueue[increaseQueueLength++] = ++ ((long)(offX + (offZ << COORDINATE_BITS) + encodeOffset) & ((1L << (COORDINATE_BITS + COORDINATE_BITS)) - 1)) | ++ ((sourceLevel & (LEVEL_COUNT - 1L)) << (COORDINATE_BITS + COORDINATE_BITS)) | ++ (FLAG_WRITE_LEVEL | (ALL_DIRECTIONS_BITSET << (COORDINATE_BITS + COORDINATE_BITS + LEVEL_BITS))); ++ } ++ ++ // queue next ++ // note: targetLevel > 0 here, since toPropagate >= currentLevel and currentLevel > 0 ++ // now combine into one bitset to pass to child ++ // the child bitset is 4x4, so we just shift each line by 4 ++ // add the propagation bitset offset to each line to make it easy to OR it into the propagation queue value ++ final long childPropagation = ++ ((bitsetLine1 >>> (start)) << (COORDINATE_BITS + COORDINATE_BITS + LEVEL_BITS)) | // z = -1 ++ ((bitsetLine2 >>> (start + 8)) << (4 + COORDINATE_BITS + COORDINATE_BITS + LEVEL_BITS)) | // z = 0 ++ ((bitsetLine3 >>> (start + (8 + 8))) << (4 + 4 + COORDINATE_BITS + COORDINATE_BITS + LEVEL_BITS)); // z = 1 ++ ++ // don't queue update if toPropagate cannot propagate anything to neighbours ++ // (for increase, propagating 0 to neighbours is useless) ++ if (queueLength >= queue.length) { ++ queue = this.resizeDecreaseQueue(); ++ } ++ queue[queueLength++] = ++ ((long)(offX + (offZ << COORDINATE_BITS) + encodeOffset) & ((1L << (COORDINATE_BITS + COORDINATE_BITS)) - 1)) | ++ ((toPropagate & (LEVEL_COUNT - 1L)) << (COORDINATE_BITS + COORDINATE_BITS)) | ++ (ALL_DIRECTIONS_BITSET << (COORDINATE_BITS + COORDINATE_BITS + LEVEL_BITS)); //childPropagation; ++ continue; ++ } ++ } ++ ++ // propagate sources we clobbered ++ this.increaseQueueInitialLength = increaseQueueLength; ++ this.performIncrease(); ++ } ++ } ++ ++ private static final class Coordinate implements Comparable<Coordinate> { ++ ++ public final long key; ++ ++ public Coordinate(final long key) { ++ this.key = key; ++ } ++ ++ public Coordinate(final int x, final int z) { ++ this.key = key(x, z); ++ } ++ ++ public static long key(final int x, final int z) { ++ return ((long)z << 32) | (x & 0xFFFFFFFFL); ++ } ++ ++ public static int x(final long key) { ++ return (int)key; ++ } ++ ++ public static int z(final long key) { ++ return (int)(key >>> 32); ++ } ++ ++ @Override ++ public int hashCode() { ++ return (int)HashCommon.mix(this.key); ++ } ++ ++ @Override ++ public boolean equals(final Object obj) { ++ if (this == obj) { ++ return true; ++ } ++ ++ if (!(obj instanceof Coordinate other)) { ++ return false; ++ } ++ ++ return this.key == other.key; ++ } ++ ++ // This class is intended for HashMap/ConcurrentHashMap usage, which do treeify bin nodes if the chain ++ // is too large. So we should implement compareTo to help. ++ @Override ++ public int compareTo(final Coordinate other) { ++ return Long.compare(this.key, other.key); ++ } ++ ++ @Override ++ public String toString() { ++ return "[" + x(this.key) + "," + z(this.key) + "]"; ++ } ++ } ++ ++ /* ++ private static final java.util.Random random = new java.util.Random(4L); ++ private static final List<io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.SingleUserAreaMap<Void>> walkers = ++ new java.util.ArrayList<>(); ++ static final int PLAYERS = 0; ++ static final int RAD_BLOCKS = 10000; ++ static final int RAD = RAD_BLOCKS >> 4; ++ static final int RAD_BIG_BLOCKS = 100_000; ++ static final int RAD_BIG = RAD_BIG_BLOCKS >> 4; ++ static final int VD = 4; ++ static final int BIG_PLAYERS = 50; ++ static final double WALK_CHANCE = 0.10; ++ static final double TP_CHANCE = 0.01; ++ static final int TP_BACK_PLAYERS = 200; ++ static final double TP_BACK_CHANCE = 0.25; ++ static final double TP_STEAL_CHANCE = 0.25; ++ private static final List<io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.SingleUserAreaMap<Void>> tpBack = ++ new java.util.ArrayList<>(); ++ ++ public static void main(final String[] args) { ++ final ReentrantAreaLock ticketLock = new ReentrantAreaLock(SECTION_SHIFT); ++ final ReentrantAreaLock schedulingLock = new ReentrantAreaLock(SECTION_SHIFT); ++ final Long2ByteLinkedOpenHashMap levelMap = new Long2ByteLinkedOpenHashMap(); ++ final Long2ByteLinkedOpenHashMap refMap = new Long2ByteLinkedOpenHashMap(); ++ final io.papermc.paper.util.misc.Delayed8WayDistancePropagator2D ref = new io.papermc.paper.util.misc.Delayed8WayDistancePropagator2D((final long coordinate, final byte oldLevel, final byte newLevel) -> { ++ if (newLevel == 0) { ++ refMap.remove(coordinate); ++ } else { ++ refMap.put(coordinate, newLevel); ++ } ++ }); ++ final ThreadedTicketLevelPropagator propagator = new ThreadedTicketLevelPropagator() { ++ @Override ++ protected void processLevelUpdates(Long2ByteLinkedOpenHashMap updates) { ++ for (final long key : updates.keySet()) { ++ final byte val = updates.get(key); ++ if (val == 0) { ++ levelMap.remove(key); ++ } else { ++ levelMap.put(key, val); ++ } ++ } ++ } ++ ++ @Override ++ protected void processSchedulingUpdates(Long2ByteLinkedOpenHashMap updates, List<ChunkProgressionTask> scheduledTasks, List<NewChunkHolder> changedFullStatus) {} ++ }; ++ ++ for (;;) { ++ if (walkers.isEmpty() && tpBack.isEmpty()) { ++ for (int i = 0; i < PLAYERS; ++i) { ++ int rad = i < BIG_PLAYERS ? RAD_BIG : RAD; ++ int posX = random.nextInt(-rad, rad + 1); ++ int posZ = random.nextInt(-rad, rad + 1); ++ ++ io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.SingleUserAreaMap<Void> map = new io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.SingleUserAreaMap<>(null) { ++ @Override ++ protected void addCallback(Void parameter, int chunkX, int chunkZ) { ++ int src = 45 - 31 + 1; ++ ref.setSource(chunkX, chunkZ, src); ++ propagator.setSource(chunkX, chunkZ, src); ++ } ++ ++ @Override ++ protected void removeCallback(Void parameter, int chunkX, int chunkZ) { ++ ref.removeSource(chunkX, chunkZ); ++ propagator.removeSource(chunkX, chunkZ); ++ } ++ }; ++ ++ map.add(posX, posZ, VD); ++ ++ walkers.add(map); ++ } ++ for (int i = 0; i < TP_BACK_PLAYERS; ++i) { ++ int rad = RAD_BIG; ++ int posX = random.nextInt(-rad, rad + 1); ++ int posZ = random.nextInt(-rad, rad + 1); ++ ++ io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.SingleUserAreaMap<Void> map = new io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.SingleUserAreaMap<>(null) { ++ @Override ++ protected void addCallback(Void parameter, int chunkX, int chunkZ) { ++ int src = 45 - 31 + 1; ++ ref.setSource(chunkX, chunkZ, src); ++ propagator.setSource(chunkX, chunkZ, src); ++ } ++ ++ @Override ++ protected void removeCallback(Void parameter, int chunkX, int chunkZ) { ++ ref.removeSource(chunkX, chunkZ); ++ propagator.removeSource(chunkX, chunkZ); ++ } ++ }; ++ ++ map.add(posX, posZ, random.nextInt(1, 63)); ++ ++ tpBack.add(map); ++ } ++ } else { ++ for (int i = 0; i < PLAYERS; ++i) { ++ if (random.nextDouble() > WALK_CHANCE) { ++ continue; ++ } ++ ++ io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.SingleUserAreaMap<Void> map = walkers.get(i); ++ ++ int updateX = random.nextInt(-1, 2); ++ int updateZ = random.nextInt(-1, 2); ++ ++ map.update(map.lastChunkX + updateX, map.lastChunkZ + updateZ, VD); ++ } ++ ++ for (int i = 0; i < PLAYERS; ++i) { ++ if (random.nextDouble() > TP_CHANCE) { ++ continue; ++ } ++ ++ int rad = i < BIG_PLAYERS ? RAD_BIG : RAD; ++ int posX = random.nextInt(-rad, rad + 1); ++ int posZ = random.nextInt(-rad, rad + 1); ++ ++ io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.SingleUserAreaMap<Void> map = walkers.get(i); ++ ++ map.update(posX, posZ, VD); ++ } ++ ++ for (int i = 0; i < TP_BACK_PLAYERS; ++i) { ++ if (random.nextDouble() > TP_BACK_CHANCE) { ++ continue; ++ } ++ ++ io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.SingleUserAreaMap<Void> map = tpBack.get(i); ++ ++ map.update(-map.lastChunkX, -map.lastChunkZ, random.nextInt(1, 63)); ++ ++ if (random.nextDouble() > TP_STEAL_CHANCE) { ++ propagator.performUpdate( ++ map.lastChunkX >> SECTION_SHIFT, map.lastChunkZ >> SECTION_SHIFT, schedulingLock, null, null ++ ); ++ propagator.performUpdate( ++ (-map.lastChunkX >> SECTION_SHIFT), (-map.lastChunkZ >> SECTION_SHIFT), schedulingLock, null, null ++ ); ++ } ++ } ++ } ++ ++ ref.propagateUpdates(); ++ propagator.performUpdates(ticketLock, schedulingLock, null, null); ++ ++ if (!refMap.equals(levelMap)) { ++ throw new IllegalStateException("Error!"); ++ } ++ } ++ } ++ */ ++} +diff --git a/src/main/java/io/papermc/paper/chunk/system/scheduling/queue/RadiusAwarePrioritisedExecutor.java b/src/main/java/io/papermc/paper/chunk/system/scheduling/queue/RadiusAwarePrioritisedExecutor.java +new file mode 100644 +index 0000000000000000000000000000000000000000..f7b0e2564ac4bd2db1d2b2bdc230c9f52f8a21b7 +--- /dev/null ++++ b/src/main/java/io/papermc/paper/chunk/system/scheduling/queue/RadiusAwarePrioritisedExecutor.java +@@ -0,0 +1,667 @@ ++package io.papermc.paper.chunk.system.scheduling.queue; ++ ++import ca.spottedleaf.concurrentutil.executor.standard.PrioritisedExecutor; ++import io.papermc.paper.util.CoordinateUtils; ++import it.unimi.dsi.fastutil.longs.Long2ReferenceOpenHashMap; ++import it.unimi.dsi.fastutil.objects.ReferenceOpenHashSet; ++import java.util.ArrayList; ++import java.util.Comparator; ++import java.util.List; ++import java.util.PriorityQueue; ++ ++public class RadiusAwarePrioritisedExecutor { ++ ++ private static final Comparator<DependencyNode> DEPENDENCY_NODE_COMPARATOR = (final DependencyNode t1, final DependencyNode t2) -> { ++ return Long.compare(t1.id, t2.id); ++ }; ++ ++ private final DependencyTree[] queues = new DependencyTree[PrioritisedExecutor.Priority.TOTAL_SCHEDULABLE_PRIORITIES]; ++ private static final int NO_TASKS_QUEUED = -1; ++ private int selectedQueue = NO_TASKS_QUEUED; ++ private boolean canQueueTasks = true; ++ ++ public RadiusAwarePrioritisedExecutor(final PrioritisedExecutor executor, final int maxToSchedule) { ++ for (int i = 0; i < this.queues.length; ++i) { ++ this.queues[i] = new DependencyTree(this, executor, maxToSchedule, i); ++ } ++ } ++ ++ private boolean canQueueTasks() { ++ return this.canQueueTasks; ++ } ++ ++ private List<PrioritisedExecutor.PrioritisedTask> treeFinished() { ++ this.canQueueTasks = true; ++ for (int priority = 0; priority < this.queues.length; ++priority) { ++ final DependencyTree queue = this.queues[priority]; ++ if (queue.hasWaitingTasks()) { ++ final List<PrioritisedExecutor.PrioritisedTask> ret = queue.tryPushTasks(); ++ ++ if (ret == null || ret.isEmpty()) { ++ // this happens when the tasks in the wait queue were purged ++ // in this case, the queue was actually empty, we just had to purge it ++ // if we set the selected queue without scheduling any tasks, the queue will never be unselected ++ // as that requires a scheduled task completing... ++ continue; ++ } ++ ++ this.selectedQueue = priority; ++ return ret; ++ } ++ } ++ ++ this.selectedQueue = NO_TASKS_QUEUED; ++ ++ return null; ++ } ++ ++ private List<PrioritisedExecutor.PrioritisedTask> queue(final Task task, final PrioritisedExecutor.Priority priority) { ++ final int priorityId = priority.priority; ++ final DependencyTree queue = this.queues[priorityId]; ++ ++ final DependencyNode node = new DependencyNode(task, queue); ++ ++ if (task.dependencyNode != null) { ++ throw new IllegalStateException(); ++ } ++ task.dependencyNode = node; ++ ++ queue.pushNode(node); ++ ++ if (this.selectedQueue == NO_TASKS_QUEUED) { ++ this.canQueueTasks = true; ++ this.selectedQueue = priorityId; ++ return queue.tryPushTasks(); ++ } ++ ++ if (!this.canQueueTasks) { ++ return null; ++ } ++ ++ if (PrioritisedExecutor.Priority.isHigherPriority(priorityId, this.selectedQueue)) { ++ // prevent the lower priority tree from queueing more tasks ++ this.canQueueTasks = false; ++ return null; ++ } ++ ++ // priorityId != selectedQueue: lower priority, don't care - treeFinished will pick it up ++ return priorityId == this.selectedQueue ? queue.tryPushTasks() : null; ++ } ++ ++ public PrioritisedExecutor.PrioritisedTask createTask(final int chunkX, final int chunkZ, final int radius, ++ final Runnable run, final PrioritisedExecutor.Priority priority) { ++ if (radius < 0) { ++ throw new IllegalArgumentException("Radius must be > 0: " + radius); ++ } ++ return new Task(this, chunkX, chunkZ, radius, run, priority); ++ } ++ ++ public PrioritisedExecutor.PrioritisedTask createTask(final int chunkX, final int chunkZ, final int radius, ++ final Runnable run) { ++ return this.createTask(chunkX, chunkZ, radius, run, PrioritisedExecutor.Priority.NORMAL); ++ } ++ ++ public PrioritisedExecutor.PrioritisedTask queueTask(final int chunkX, final int chunkZ, final int radius, ++ final Runnable run, final PrioritisedExecutor.Priority priority) { ++ final PrioritisedExecutor.PrioritisedTask ret = this.createTask(chunkX, chunkZ, radius, run, priority); ++ ++ ret.queue(); ++ ++ return ret; ++ } ++ ++ public PrioritisedExecutor.PrioritisedTask queueTask(final int chunkX, final int chunkZ, final int radius, ++ final Runnable run) { ++ final PrioritisedExecutor.PrioritisedTask ret = this.createTask(chunkX, chunkZ, radius, run); ++ ++ ret.queue(); ++ ++ return ret; ++ } ++ ++ public PrioritisedExecutor.PrioritisedTask createInfiniteRadiusTask(final Runnable run, final PrioritisedExecutor.Priority priority) { ++ return new Task(this, 0, 0, -1, run, priority); ++ } ++ ++ public PrioritisedExecutor.PrioritisedTask createInfiniteRadiusTask(final Runnable run) { ++ return this.createInfiniteRadiusTask(run, PrioritisedExecutor.Priority.NORMAL); ++ } ++ ++ public PrioritisedExecutor.PrioritisedTask queueInfiniteRadiusTask(final Runnable run, final PrioritisedExecutor.Priority priority) { ++ final PrioritisedExecutor.PrioritisedTask ret = this.createInfiniteRadiusTask(run, priority); ++ ++ ret.queue(); ++ ++ return ret; ++ } ++ ++ public PrioritisedExecutor.PrioritisedTask queueInfiniteRadiusTask(final Runnable run) { ++ final PrioritisedExecutor.PrioritisedTask ret = this.createInfiniteRadiusTask(run, PrioritisedExecutor.Priority.NORMAL); ++ ++ ret.queue(); ++ ++ return ret; ++ } ++ ++ // all accesses must be synchronised by the radius aware object ++ private static final class DependencyTree { ++ ++ private final RadiusAwarePrioritisedExecutor scheduler; ++ private final PrioritisedExecutor executor; ++ private final int maxToSchedule; ++ private final int treeIndex; ++ ++ private int currentlyExecuting; ++ private long idGenerator; ++ ++ private final PriorityQueue<DependencyNode> awaiting = new PriorityQueue<>(DEPENDENCY_NODE_COMPARATOR); ++ ++ private final PriorityQueue<DependencyNode> infiniteRadius = new PriorityQueue<>(DEPENDENCY_NODE_COMPARATOR); ++ private boolean isInfiniteRadiusScheduled; ++ ++ private final Long2ReferenceOpenHashMap<DependencyNode> nodeByPosition = new Long2ReferenceOpenHashMap<>(); ++ ++ public DependencyTree(final RadiusAwarePrioritisedExecutor scheduler, final PrioritisedExecutor executor, ++ final int maxToSchedule, final int treeIndex) { ++ this.scheduler = scheduler; ++ this.executor = executor; ++ this.maxToSchedule = maxToSchedule; ++ this.treeIndex = treeIndex; ++ } ++ ++ public boolean hasWaitingTasks() { ++ return !this.awaiting.isEmpty() || !this.infiniteRadius.isEmpty(); ++ } ++ ++ private long nextId() { ++ return this.idGenerator++; ++ } ++ ++ private boolean isExecutingAnyTasks() { ++ return this.currentlyExecuting != 0; ++ } ++ ++ private void pushNode(final DependencyNode node) { ++ if (!node.task.isFiniteRadius()) { ++ this.infiniteRadius.add(node); ++ return; ++ } ++ ++ // set up dependency for node ++ final Task task = node.task; ++ ++ final int centerX = task.chunkX; ++ final int centerZ = task.chunkZ; ++ final int radius = task.radius; ++ ++ final int minX = centerX - radius; ++ final int maxX = centerX + radius; ++ ++ final int minZ = centerZ - radius; ++ final int maxZ = centerZ + radius; ++ ++ ReferenceOpenHashSet<DependencyNode> parents = null; ++ for (int currZ = minZ; currZ <= maxZ; ++currZ) { ++ for (int currX = minX; currX <= maxX; ++currX) { ++ final DependencyNode dependency = this.nodeByPosition.put(CoordinateUtils.getChunkKey(currX, currZ), node); ++ if (dependency != null) { ++ if (parents == null) { ++ parents = new ReferenceOpenHashSet<>(); ++ } ++ if (parents.add(dependency)) { ++ // added a dependency, so we need to add as a child to the dependency ++ if (dependency.children == null) { ++ dependency.children = new ArrayList<>(); ++ } ++ dependency.children.add(node); ++ } ++ } ++ } ++ } ++ ++ if (parents == null) { ++ // no dependencies, add straight to awaiting ++ this.awaiting.add(node); ++ } else { ++ node.parents = parents.size(); ++ // we will be added to awaiting once we have no parents ++ } ++ } ++ ++ // called only when a node is returned after being executed ++ private List<PrioritisedExecutor.PrioritisedTask> returnNode(final DependencyNode node) { ++ final Task task = node.task; ++ ++ // now that the task is completed, we can push its children to the awaiting queue ++ this.pushChildren(node); ++ ++ if (task.isFiniteRadius()) { ++ // remove from dependency map ++ this.removeNodeFromMap(node); ++ } else { ++ // mark as no longer executing infinite radius ++ if (!this.isInfiniteRadiusScheduled) { ++ throw new IllegalStateException(); ++ } ++ this.isInfiniteRadiusScheduled = false; ++ } ++ ++ // decrement executing count, we are done executing this task ++ --this.currentlyExecuting; ++ ++ if (this.currentlyExecuting == 0) { ++ return this.scheduler.treeFinished(); ++ } ++ ++ return this.scheduler.canQueueTasks() ? this.tryPushTasks() : null; ++ } ++ ++ private List<PrioritisedExecutor.PrioritisedTask> tryPushTasks() { ++ // tasks are not queued, but only created here - we do hold the lock for the map ++ List<PrioritisedExecutor.PrioritisedTask> ret = null; ++ PrioritisedExecutor.PrioritisedTask pushedTask; ++ while ((pushedTask = this.tryPushTask()) != null) { ++ if (ret == null) { ++ ret = new ArrayList<>(); ++ } ++ ret.add(pushedTask); ++ } ++ ++ return ret; ++ } ++ ++ private void removeNodeFromMap(final DependencyNode node) { ++ final Task task = node.task; ++ ++ final int centerX = task.chunkX; ++ final int centerZ = task.chunkZ; ++ final int radius = task.radius; ++ ++ final int minX = centerX - radius; ++ final int maxX = centerX + radius; ++ ++ final int minZ = centerZ - radius; ++ final int maxZ = centerZ + radius; ++ ++ for (int currZ = minZ; currZ <= maxZ; ++currZ) { ++ for (int currX = minX; currX <= maxX; ++currX) { ++ this.nodeByPosition.remove(CoordinateUtils.getChunkKey(currX, currZ), node); ++ } ++ } ++ } ++ ++ private void pushChildren(final DependencyNode node) { ++ // add all the children that we can into awaiting ++ final List<DependencyNode> children = node.children; ++ if (children != null) { ++ for (int i = 0, len = children.size(); i < len; ++i) { ++ final DependencyNode child = children.get(i); ++ int newParents = --child.parents; ++ if (newParents == 0) { ++ // no more dependents, we can push to awaiting ++ // even if the child is purged, we need to push it so that its children will be pushed ++ this.awaiting.add(child); ++ } else if (newParents < 0) { ++ throw new IllegalStateException(); ++ } ++ } ++ } ++ } ++ ++ private DependencyNode pollAwaiting() { ++ final DependencyNode ret = this.awaiting.poll(); ++ if (ret == null) { ++ return ret; ++ } ++ ++ if (ret.parents != 0) { ++ throw new IllegalStateException(); ++ } ++ ++ if (ret.purged) { ++ // need to manually remove from state here ++ this.pushChildren(ret); ++ this.removeNodeFromMap(ret); ++ } // else: delay children push until the task has finished ++ ++ return ret; ++ } ++ ++ private DependencyNode pollInfinite() { ++ return this.infiniteRadius.poll(); ++ } ++ ++ public PrioritisedExecutor.PrioritisedTask tryPushTask() { ++ if (this.currentlyExecuting >= this.maxToSchedule || this.isInfiniteRadiusScheduled) { ++ return null; ++ } ++ ++ DependencyNode firstInfinite; ++ while ((firstInfinite = this.infiniteRadius.peek()) != null && firstInfinite.purged) { ++ this.pollInfinite(); ++ } ++ ++ DependencyNode firstAwaiting; ++ while ((firstAwaiting = this.awaiting.peek()) != null && firstAwaiting.purged) { ++ this.pollAwaiting(); ++ } ++ ++ if (firstInfinite == null && firstAwaiting == null) { ++ return null; ++ } ++ ++ // firstAwaiting compared to firstInfinite ++ final int compare; ++ ++ if (firstAwaiting == null) { ++ // we choose first infinite, or infinite < awaiting ++ compare = 1; ++ } else if (firstInfinite == null) { ++ // we choose first awaiting, or awaiting < infinite ++ compare = -1; ++ } else { ++ compare = DEPENDENCY_NODE_COMPARATOR.compare(firstAwaiting, firstInfinite); ++ } ++ ++ if (compare >= 0) { ++ if (this.currentlyExecuting != 0) { ++ // don't queue infinite task while other tasks are executing in parallel ++ return null; ++ } ++ ++this.currentlyExecuting; ++ this.pollInfinite(); ++ this.isInfiniteRadiusScheduled = true; ++ return firstInfinite.task.pushTask(this.executor); ++ } else { ++ ++this.currentlyExecuting; ++ this.pollAwaiting(); ++ return firstAwaiting.task.pushTask(this.executor); ++ } ++ } ++ } ++ ++ private static final class DependencyNode { ++ ++ private final Task task; ++ private final DependencyTree tree; ++ ++ // dependency tree fields ++ // (must hold lock on the scheduler to use) ++ // null is the same as empty, we just use it so that we don't allocate the set unless we need to ++ private List<DependencyNode> children; ++ // 0 indicates that this task is considered "awaiting" ++ private int parents; ++ // false -> scheduled and not cancelled ++ // true -> scheduled but cancelled ++ private boolean purged; ++ private final long id; ++ ++ public DependencyNode(final Task task, final DependencyTree tree) { ++ this.task = task; ++ this.id = tree.nextId(); ++ this.tree = tree; ++ } ++ } ++ ++ private static final class Task implements PrioritisedExecutor.PrioritisedTask, Runnable { ++ ++ // task specific fields ++ private final RadiusAwarePrioritisedExecutor scheduler; ++ private final int chunkX; ++ private final int chunkZ; ++ private final int radius; ++ private Runnable run; ++ private PrioritisedExecutor.Priority priority; ++ ++ private DependencyNode dependencyNode; ++ private PrioritisedExecutor.PrioritisedTask queuedTask; ++ ++ private Task(final RadiusAwarePrioritisedExecutor scheduler, final int chunkX, final int chunkZ, final int radius, ++ final Runnable run, final PrioritisedExecutor.Priority priority) { ++ this.scheduler = scheduler; ++ this.chunkX = chunkX; ++ this.chunkZ = chunkZ; ++ this.radius = radius; ++ this.run = run; ++ this.priority = priority; ++ } ++ ++ private boolean isFiniteRadius() { ++ return this.radius >= 0; ++ } ++ ++ private PrioritisedExecutor.PrioritisedTask pushTask(final PrioritisedExecutor executor) { ++ return this.queuedTask = executor.createTask(this, this.priority); ++ } ++ ++ private void executeTask() { ++ final Runnable run = this.run; ++ this.run = null; ++ run.run(); ++ } ++ ++ private static void scheduleTasks(final List<PrioritisedExecutor.PrioritisedTask> toSchedule) { ++ if (toSchedule != null) { ++ for (int i = 0, len = toSchedule.size(); i < len; ++i) { ++ toSchedule.get(i).queue(); ++ } ++ } ++ } ++ ++ private void returnNode() { ++ final List<PrioritisedExecutor.PrioritisedTask> toSchedule; ++ synchronized (this.scheduler) { ++ final DependencyNode node = this.dependencyNode; ++ this.dependencyNode = null; ++ toSchedule = node.tree.returnNode(node); ++ } ++ ++ scheduleTasks(toSchedule); ++ } ++ ++ @Override ++ public void run() { ++ final Runnable run = this.run; ++ this.run = null; ++ try { ++ run.run(); ++ } finally { ++ this.returnNode(); ++ } ++ } ++ ++ @Override ++ public boolean queue() { ++ final List<PrioritisedExecutor.PrioritisedTask> toSchedule; ++ synchronized (this.scheduler) { ++ if (this.queuedTask != null || this.dependencyNode != null || this.priority == PrioritisedExecutor.Priority.COMPLETING) { ++ return false; ++ } ++ ++ toSchedule = this.scheduler.queue(this, this.priority); ++ } ++ ++ scheduleTasks(toSchedule); ++ return true; ++ } ++ ++ @Override ++ public boolean cancel() { ++ final PrioritisedExecutor.PrioritisedTask task; ++ synchronized (this.scheduler) { ++ if ((task = this.queuedTask) == null) { ++ if (this.priority == PrioritisedExecutor.Priority.COMPLETING) { ++ return false; ++ } ++ ++ this.priority = PrioritisedExecutor.Priority.COMPLETING; ++ if (this.dependencyNode != null) { ++ this.dependencyNode.purged = true; ++ this.dependencyNode = null; ++ } ++ ++ return true; ++ } ++ } ++ ++ if (task.cancel()) { ++ // must manually return the node ++ this.run = null; ++ this.returnNode(); ++ return true; ++ } ++ return false; ++ } ++ ++ @Override ++ public boolean execute() { ++ final PrioritisedExecutor.PrioritisedTask task; ++ synchronized (this.scheduler) { ++ if ((task = this.queuedTask) == null) { ++ if (this.priority == PrioritisedExecutor.Priority.COMPLETING) { ++ return false; ++ } ++ ++ this.priority = PrioritisedExecutor.Priority.COMPLETING; ++ if (this.dependencyNode != null) { ++ this.dependencyNode.purged = true; ++ this.dependencyNode = null; ++ } ++ // fall through to execution logic ++ } ++ } ++ ++ if (task != null) { ++ // will run the return node logic automatically ++ return task.execute(); ++ } else { ++ // don't run node removal/insertion logic, we aren't actually removed from the dependency tree ++ this.executeTask(); ++ return true; ++ } ++ } ++ ++ @Override ++ public PrioritisedExecutor.Priority getPriority() { ++ final PrioritisedExecutor.PrioritisedTask task; ++ synchronized (this.scheduler) { ++ if ((task = this.queuedTask) == null) { ++ return this.priority; ++ } ++ } ++ ++ return task.getPriority(); ++ } ++ ++ @Override ++ public boolean setPriority(final PrioritisedExecutor.Priority priority) { ++ if (!PrioritisedExecutor.Priority.isValidPriority(priority)) { ++ throw new IllegalArgumentException("Invalid priority " + priority); ++ } ++ ++ final PrioritisedExecutor.PrioritisedTask task; ++ List<PrioritisedExecutor.PrioritisedTask> toSchedule = null; ++ synchronized (this.scheduler) { ++ if ((task = this.queuedTask) == null) { ++ if (this.priority == PrioritisedExecutor.Priority.COMPLETING) { ++ return false; ++ } ++ ++ if (this.priority == priority) { ++ return true; ++ } ++ ++ this.priority = priority; ++ if (this.dependencyNode != null) { ++ // need to re-insert node ++ this.dependencyNode.purged = true; ++ this.dependencyNode = null; ++ toSchedule = this.scheduler.queue(this, priority); ++ } ++ } ++ } ++ ++ if (task != null) { ++ return task.setPriority(priority); ++ } ++ ++ scheduleTasks(toSchedule); ++ ++ return true; ++ } ++ ++ @Override ++ public boolean raisePriority(final PrioritisedExecutor.Priority priority) { ++ if (!PrioritisedExecutor.Priority.isValidPriority(priority)) { ++ throw new IllegalArgumentException("Invalid priority " + priority); ++ } ++ ++ final PrioritisedExecutor.PrioritisedTask task; ++ List<PrioritisedExecutor.PrioritisedTask> toSchedule = null; ++ synchronized (this.scheduler) { ++ if ((task = this.queuedTask) == null) { ++ if (this.priority == PrioritisedExecutor.Priority.COMPLETING) { ++ return false; ++ } ++ ++ if (this.priority.isHigherOrEqualPriority(priority)) { ++ return true; ++ } ++ ++ this.priority = priority; ++ if (this.dependencyNode != null) { ++ // need to re-insert node ++ this.dependencyNode.purged = true; ++ this.dependencyNode = null; ++ toSchedule = this.scheduler.queue(this, priority); ++ } ++ } ++ } ++ ++ if (task != null) { ++ return task.raisePriority(priority); ++ } ++ ++ scheduleTasks(toSchedule); ++ ++ return true; ++ } ++ ++ @Override ++ public boolean lowerPriority(final PrioritisedExecutor.Priority priority) { ++ if (!PrioritisedExecutor.Priority.isValidPriority(priority)) { ++ throw new IllegalArgumentException("Invalid priority " + priority); ++ } ++ ++ final PrioritisedExecutor.PrioritisedTask task; ++ List<PrioritisedExecutor.PrioritisedTask> toSchedule = null; ++ synchronized (this.scheduler) { ++ if ((task = this.queuedTask) == null) { ++ if (this.priority == PrioritisedExecutor.Priority.COMPLETING) { ++ return false; ++ } ++ ++ if (this.priority.isLowerOrEqualPriority(priority)) { ++ return true; ++ } ++ ++ this.priority = priority; ++ if (this.dependencyNode != null) { ++ // need to re-insert node ++ this.dependencyNode.purged = true; ++ this.dependencyNode = null; ++ toSchedule = this.scheduler.queue(this, priority); ++ } ++ } ++ } ++ ++ if (task != null) { ++ return task.lowerPriority(priority); ++ } ++ ++ scheduleTasks(toSchedule); ++ ++ return true; ++ } ++ } ++} +diff --git a/src/main/java/io/papermc/paper/command/PaperCommand.java b/src/main/java/io/papermc/paper/command/PaperCommand.java +index e47fb2aa5e885162cae5cbfc9f33ff7864bf538e..b68b37274f22c2a89d723aec4d1c6be813eef73c 100644 +--- a/src/main/java/io/papermc/paper/command/PaperCommand.java ++++ b/src/main/java/io/papermc/paper/command/PaperCommand.java +@@ -43,6 +43,7 @@ public final class PaperCommand extends Command { + commands.put(Set.of("mobcaps", "playermobcaps"), new MobcapsCommand()); + commands.put(Set.of("dumplisteners"), new DumpListenersCommand()); + commands.put(Set.of("fixlight"), new FixLightCommand()); ++ commands.put(Set.of("debug", "chunkinfo", "holderinfo"), new ChunkDebugCommand()); + + return commands.entrySet().stream() + .flatMap(entry -> entry.getKey().stream().map(s -> Map.entry(s, entry.getValue()))) +diff --git a/src/main/java/io/papermc/paper/command/subcommands/ChunkDebugCommand.java b/src/main/java/io/papermc/paper/command/subcommands/ChunkDebugCommand.java +new file mode 100644 +index 0000000000000000000000000000000000000000..962d3cae6340fc11607b59355e291629618f289c +--- /dev/null ++++ b/src/main/java/io/papermc/paper/command/subcommands/ChunkDebugCommand.java +@@ -0,0 +1,265 @@ ++package io.papermc.paper.command.subcommands; ++ ++import io.papermc.paper.command.CommandUtil; ++import io.papermc.paper.command.PaperSubcommand; ++import java.io.File; ++import java.time.LocalDateTime; ++import java.time.format.DateTimeFormatter; ++import java.util.ArrayList; ++import java.util.Collections; ++import java.util.List; ++import java.util.Locale; ++import io.papermc.paper.util.MCUtil; ++import net.minecraft.server.MinecraftServer; ++import net.minecraft.server.level.ChunkHolder; ++import net.minecraft.server.level.FullChunkStatus; ++import net.minecraft.server.level.ServerLevel; ++import net.minecraft.world.level.chunk.ChunkAccess; ++import net.minecraft.world.level.chunk.ImposterProtoChunk; ++import net.minecraft.world.level.chunk.LevelChunk; ++import net.minecraft.world.level.chunk.ProtoChunk; ++import org.bukkit.Bukkit; ++import org.bukkit.command.CommandSender; ++import org.bukkit.craftbukkit.CraftWorld; ++import org.checkerframework.checker.nullness.qual.NonNull; ++import org.checkerframework.checker.nullness.qual.Nullable; ++import org.checkerframework.framework.qual.DefaultQualifier; ++ ++import static net.kyori.adventure.text.Component.text; ++import static net.kyori.adventure.text.format.NamedTextColor.BLUE; ++import static net.kyori.adventure.text.format.NamedTextColor.DARK_AQUA; ++import static net.kyori.adventure.text.format.NamedTextColor.GREEN; ++import static net.kyori.adventure.text.format.NamedTextColor.RED; ++ ++@DefaultQualifier(NonNull.class) ++public final class ChunkDebugCommand implements PaperSubcommand { ++ @Override ++ public boolean execute(final CommandSender sender, final String subCommand, final String[] args) { ++ switch (subCommand) { ++ case "debug" -> this.doDebug(sender, args); ++ case "chunkinfo" -> this.doChunkInfo(sender, args); ++ case "holderinfo" -> this.doHolderInfo(sender, args); ++ } ++ return true; ++ } ++ ++ @Override ++ public List<String> tabComplete(final CommandSender sender, final String subCommand, final String[] args) { ++ switch (subCommand) { ++ case "debug" -> { ++ if (args.length == 1) { ++ return CommandUtil.getListMatchingLast(sender, args, "help", "chunks"); ++ } ++ } ++ case "holderinfo" -> { ++ List<String> worldNames = new ArrayList<>(); ++ worldNames.add("*"); ++ for (org.bukkit.World world : Bukkit.getWorlds()) { ++ worldNames.add(world.getName()); ++ } ++ if (args.length == 1) { ++ return CommandUtil.getListMatchingLast(sender, args, worldNames); ++ } ++ } ++ case "chunkinfo" -> { ++ List<String> worldNames = new ArrayList<>(); ++ worldNames.add("*"); ++ for (org.bukkit.World world : Bukkit.getWorlds()) { ++ worldNames.add(world.getName()); ++ } ++ if (args.length == 1) { ++ return CommandUtil.getListMatchingLast(sender, args, worldNames); ++ } ++ } ++ } ++ return Collections.emptyList(); ++ } ++ ++ private void doChunkInfo(final CommandSender sender, final String[] args) { ++ List<org.bukkit.World> worlds; ++ if (args.length < 1 || args[0].equals("*")) { ++ worlds = Bukkit.getWorlds(); ++ } else { ++ worlds = new ArrayList<>(args.length); ++ for (final String arg : args) { ++ org.bukkit.@Nullable World world = Bukkit.getWorld(arg); ++ if (world == null) { ++ sender.sendMessage(text("World '" + arg + "' is invalid", RED)); ++ return; ++ } ++ worlds.add(world); ++ } ++ } ++ ++ int accumulatedTotal = 0; ++ int accumulatedInactive = 0; ++ int accumulatedBorder = 0; ++ int accumulatedTicking = 0; ++ int accumulatedEntityTicking = 0; ++ ++ for (final org.bukkit.World bukkitWorld : worlds) { ++ final ServerLevel world = ((CraftWorld) bukkitWorld).getHandle(); ++ ++ int total = 0; ++ int inactive = 0; ++ int full = 0; ++ int blockTicking = 0; ++ int entityTicking = 0; ++ ++ for (final ChunkHolder chunk : io.papermc.paper.chunk.system.ChunkSystem.getVisibleChunkHolders(world)) { ++ if (chunk.getFullChunkNowUnchecked() == null) { ++ continue; ++ } ++ ++ ++total; ++ ++ FullChunkStatus state = chunk.getFullStatus(); ++ ++ switch (state) { ++ case INACCESSIBLE -> ++inactive; ++ case FULL -> ++full; ++ case BLOCK_TICKING -> ++blockTicking; ++ case ENTITY_TICKING -> ++entityTicking; ++ } ++ } ++ ++ accumulatedTotal += total; ++ accumulatedInactive += inactive; ++ accumulatedBorder += full; ++ accumulatedTicking += blockTicking; ++ accumulatedEntityTicking += entityTicking; ++ ++ sender.sendMessage(text().append(text("Chunks in ", BLUE), text(bukkitWorld.getName(), GREEN), text(":"))); ++ sender.sendMessage(text().color(DARK_AQUA).append( ++ text("Total: ", BLUE), text(total), ++ text(" Inactive: ", BLUE), text(inactive), ++ text(" Full: ", BLUE), text(full), ++ text(" Block Ticking: ", BLUE), text(blockTicking), ++ text(" Entity Ticking: ", BLUE), text(entityTicking) ++ )); ++ } ++ if (worlds.size() > 1) { ++ sender.sendMessage(text().append(text("Chunks in ", BLUE), text("all listed worlds", GREEN), text(":", DARK_AQUA))); ++ sender.sendMessage(text().color(DARK_AQUA).append( ++ text("Total: ", BLUE), text(accumulatedTotal), ++ text(" Inactive: ", BLUE), text(accumulatedInactive), ++ text(" Full: ", BLUE), text(accumulatedBorder), ++ text(" Block Ticking: ", BLUE), text(accumulatedTicking), ++ text(" Entity Ticking: ", BLUE), text(accumulatedEntityTicking) ++ )); ++ } ++ } ++ ++ private void doHolderInfo(final CommandSender sender, final String[] args) { ++ List<org.bukkit.World> worlds; ++ if (args.length < 1 || args[0].equals("*")) { ++ worlds = Bukkit.getWorlds(); ++ } else { ++ worlds = new ArrayList<>(args.length); ++ for (final String arg : args) { ++ org.bukkit.@Nullable World world = Bukkit.getWorld(arg); ++ if (world == null) { ++ sender.sendMessage(text("World '" + arg + "' is invalid", RED)); ++ return; ++ } ++ worlds.add(world); ++ } ++ } ++ ++ int accumulatedTotal = 0; ++ int accumulatedCanUnload = 0; ++ int accumulatedNull = 0; ++ int accumulatedReadOnly = 0; ++ int accumulatedProtoChunk = 0; ++ int accumulatedFullChunk = 0; ++ ++ for (final org.bukkit.World bukkitWorld : worlds) { ++ final ServerLevel world = ((CraftWorld) bukkitWorld).getHandle(); ++ ++ int total = 0; ++ int canUnload = 0; ++ int nullChunks = 0; ++ int readOnly = 0; ++ int protoChunk = 0; ++ int fullChunk = 0; ++ ++ for (final ChunkHolder chunk : world.chunkTaskScheduler.chunkHolderManager.getOldChunkHolders()) { // Paper - change updating chunks map ++ final ChunkAccess lastChunk = chunk.getAvailableChunkNow(); ++ ++ ++total; ++ ++ if (lastChunk == null) { ++ ++nullChunks; ++ } else if (lastChunk instanceof ImposterProtoChunk) { ++ ++readOnly; ++ } else if (lastChunk instanceof ProtoChunk) { ++ ++protoChunk; ++ } else if (lastChunk instanceof LevelChunk) { ++ ++fullChunk; ++ } ++ ++ if (chunk.newChunkHolder.isSafeToUnload() == null) { ++ ++canUnload; ++ } ++ } ++ ++ accumulatedTotal += total; ++ accumulatedCanUnload += canUnload; ++ accumulatedNull += nullChunks; ++ accumulatedReadOnly += readOnly; ++ accumulatedProtoChunk += protoChunk; ++ accumulatedFullChunk += fullChunk; ++ ++ sender.sendMessage(text().append(text("Chunks in ", BLUE), text(bukkitWorld.getName(), GREEN), text(":"))); ++ sender.sendMessage(text().color(DARK_AQUA).append( ++ text("Total: ", BLUE), text(total), ++ text(" Unloadable: ", BLUE), text(canUnload), ++ text(" Null: ", BLUE), text(nullChunks), ++ text(" ReadOnly: ", BLUE), text(readOnly), ++ text(" Proto: ", BLUE), text(protoChunk), ++ text(" Full: ", BLUE), text(fullChunk) ++ )); ++ } ++ if (worlds.size() > 1) { ++ sender.sendMessage(text().append(text("Chunks in ", BLUE), text("all listed worlds", GREEN), text(":", DARK_AQUA))); ++ sender.sendMessage(text().color(DARK_AQUA).append( ++ text("Total: ", BLUE), text(accumulatedTotal), ++ text(" Unloadable: ", BLUE), text(accumulatedCanUnload), ++ text(" Null: ", BLUE), text(accumulatedNull), ++ text(" ReadOnly: ", BLUE), text(accumulatedReadOnly), ++ text(" Proto: ", BLUE), text(accumulatedProtoChunk), ++ text(" Full: ", BLUE), text(accumulatedFullChunk) ++ )); ++ } ++ } ++ ++ private void doDebug(final CommandSender sender, final String[] args) { ++ if (args.length < 1) { ++ sender.sendMessage(text("Use /paper debug [chunks] help for more information on a specific command", RED)); ++ return; ++ } ++ ++ final String debugType = args[0].toLowerCase(Locale.ENGLISH); ++ switch (debugType) { ++ case "chunks" -> { ++ if (args.length >= 2 && args[1].toLowerCase(Locale.ENGLISH).equals("help")) { ++ sender.sendMessage(text("Use /paper debug chunks [world] to dump loaded chunk information to a file", RED)); ++ break; ++ } ++ File file = new File(new File(new File("."), "debug"), ++ "chunks-" + DateTimeFormatter.ofPattern("yyyy-MM-dd_HH.mm.ss").format(LocalDateTime.now()) + ".txt"); ++ sender.sendMessage(text("Writing chunk information dump to " + file, GREEN)); ++ try { ++ MCUtil.dumpChunks(file, false); ++ sender.sendMessage(text("Successfully written chunk information!", GREEN)); ++ } catch (Throwable thr) { ++ MinecraftServer.LOGGER.warn("Failed to dump chunk information to file " + file.toString(), thr); ++ sender.sendMessage(text("Failed to dump chunk information, see console", RED)); ++ } ++ } ++ // "help" & default ++ default -> sender.sendMessage(text("Use /paper debug [chunks] help for more information on a specific command", RED)); ++ } ++ } ++ ++} +diff --git a/src/main/java/io/papermc/paper/configuration/GlobalConfiguration.java b/src/main/java/io/papermc/paper/configuration/GlobalConfiguration.java +index 481cfe3a291196c0391c2ec8560e566e0e1e2fb8..30fe1c0645a07d663b08c0f988a1ab3a750bf7c4 100644 +--- a/src/main/java/io/papermc/paper/configuration/GlobalConfiguration.java ++++ b/src/main/java/io/papermc/paper/configuration/GlobalConfiguration.java +@@ -29,6 +29,45 @@ public class GlobalConfiguration extends ConfigurationPart { + public static GlobalConfiguration get() { + return instance; + } ++ ++ public ChunkLoadingBasic chunkLoadingBasic; ++ ++ public class ChunkLoadingBasic extends ConfigurationPart { ++ @Comment("The maximum rate in chunks per second that the server will send to any individual player. Set to -1 to disable this limit.") ++ public double playerMaxChunkSendRate = 75.0; ++ ++ @Comment( ++ "The maximum rate at which chunks will load for any individual player. " + ++ "Note that this setting also affects chunk generations, since a chunk load is always first issued to test if a" + ++ "chunk is already generated. Set to -1 to disable this limit." ++ ) ++ public double playerMaxChunkLoadRate = 100.0; ++ ++ @Comment("The maximum rate at which chunks will generate for any individual player. Set to -1 to disable this limit.") ++ public double playerMaxChunkGenerateRate = -1.0; ++ } ++ ++ public ChunkLoadingAdvanced chunkLoadingAdvanced; ++ ++ public class ChunkLoadingAdvanced extends ConfigurationPart { ++ @Comment( ++ "Set to true if the server will match the chunk send radius that clients have configured" + ++ "in their view distance settings if the client is less-than the server's send distance." ++ ) ++ public boolean autoConfigSendDistance = true; ++ ++ @Comment( ++ "Specifies the maximum amount of concurrent chunk loads that an individual player can have." + ++ "Set to 0 to let the server configure it automatically per player, or set it to -1 to disable the limit." ++ ) ++ public int playerMaxConcurrentChunkLoads = 0; ++ ++ @Comment( ++ "Specifies the maximum amount of concurrent chunk generations that an individual player can have." + ++ "Set to 0 to let the server configure it automatically per player, or set it to -1 to disable the limit." ++ ) ++ public int playerMaxConcurrentChunkGenerates = 0; ++ } + static void set(GlobalConfiguration instance) { + GlobalConfiguration.instance = instance; + } +@@ -130,21 +169,6 @@ public class GlobalConfiguration extends ConfigurationPart { + public int incomingPacketThreshold = 300; + } + +- public ChunkLoading chunkLoading; +- +- public class ChunkLoading extends ConfigurationPart { +- public int minLoadRadius = 2; +- public int maxConcurrentSends = 2; +- public boolean autoconfigSendDistance = true; +- public double targetPlayerChunkSendRate = 100.0; +- public double globalMaxChunkSendRate = -1.0; +- public boolean enableFrustumPriority = false; +- public double globalMaxChunkLoadRate = -1.0; +- public double playerMaxConcurrentLoads = 20.0; +- public double globalMaxConcurrentLoads = 500.0; +- public double playerMaxChunkLoadRate = -1.0; +- } +- + public UnsupportedSettings unsupportedSettings; + + public class UnsupportedSettings extends ConfigurationPart { +@@ -203,7 +227,7 @@ public class GlobalConfiguration extends ConfigurationPart { + + @PostProcess + private void postProcess() { +- //io.papermc.paper.chunk.system.scheduling.ChunkTaskScheduler.init(this); ++ io.papermc.paper.chunk.system.scheduling.ChunkTaskScheduler.init(this); + } + } + +diff --git a/src/main/java/io/papermc/paper/threadedregions/TickRegions.java b/src/main/java/io/papermc/paper/threadedregions/TickRegions.java +new file mode 100644 +index 0000000000000000000000000000000000000000..d5d39e9c1f326e91010237b0db80d527ac52f4d6 +--- /dev/null ++++ b/src/main/java/io/papermc/paper/threadedregions/TickRegions.java +@@ -0,0 +1,9 @@ ++package io.papermc.paper.threadedregions; ++ ++// placeholder class for Folia ++public class TickRegions { ++ ++ public static int getRegionChunkShift() { ++ return 4; ++ } ++} +diff --git a/src/main/java/io/papermc/paper/util/IntervalledCounter.java b/src/main/java/io/papermc/paper/util/IntervalledCounter.java +index cea9c098ade00ee87b8efc8164ab72f5279758f0..197224e31175252d8438a8df585bbb65f2288d7f 100644 +--- a/src/main/java/io/papermc/paper/util/IntervalledCounter.java ++++ b/src/main/java/io/papermc/paper/util/IntervalledCounter.java +@@ -2,6 +2,8 @@ package io.papermc.paper.util; + + public final class IntervalledCounter { + ++ private static final int INITIAL_SIZE = 8; ++ + protected long[] times; + protected long[] counts; + protected final long interval; +@@ -11,8 +13,8 @@ public final class IntervalledCounter { + protected int tail; // exclusive + + public IntervalledCounter(final long interval) { +- this.times = new long[8]; +- this.counts = new long[8]; ++ this.times = new long[INITIAL_SIZE]; ++ this.counts = new long[INITIAL_SIZE]; + this.interval = interval; + } + +@@ -67,13 +69,13 @@ public final class IntervalledCounter { + this.tail = nextTail; + } + +- public void updateAndAdd(final int count) { ++ public void updateAndAdd(final long count) { + final long currTime = System.nanoTime(); + this.updateCurrentTime(currTime); + this.addTime(currTime, count); + } + +- public void updateAndAdd(final int count, final long currTime) { ++ public void updateAndAdd(final long count, final long currTime) { + this.updateCurrentTime(currTime); + this.addTime(currTime, count); + } +@@ -93,9 +95,13 @@ public final class IntervalledCounter { + this.tail = size; + + if (tail >= head) { ++ // sequentially ordered from [head, tail) + System.arraycopy(oldElements, head, newElements, 0, size); + System.arraycopy(oldCounts, head, newCounts, 0, size); + } else { ++ // ordered from [head, length) ++ // then followed by [0, tail) ++ + System.arraycopy(oldElements, head, newElements, 0, oldElements.length - head); + System.arraycopy(oldElements, 0, newElements, oldElements.length - head, tail); + +@@ -106,10 +112,18 @@ public final class IntervalledCounter { + + // returns in units per second + public double getRate() { +- return this.size() / (this.interval * 1.0e-9); ++ return (double)this.sum / ((double)this.interval * 1.0E-9); ++ } ++ ++ public long getInterval() { ++ return this.interval; + } + +- public long size() { ++ public long getSum() { + return this.sum; + } ++ ++ public int totalDataPoints() { ++ return this.tail >= this.head ? (this.tail - this.head) : (this.tail + (this.counts.length - this.head)); ++ } + } +diff --git a/src/main/java/io/papermc/paper/util/MCUtil.java b/src/main/java/io/papermc/paper/util/MCUtil.java +index 5c401c7e30ed5f6f32b1ad6523537aa46173cff5..e5c2e53388ff61e4aeae22a74b525d9a26ea0200 100644 +--- a/src/main/java/io/papermc/paper/util/MCUtil.java ++++ b/src/main/java/io/papermc/paper/util/MCUtil.java +@@ -7,17 +7,30 @@ import com.google.common.util.concurrent.ThreadFactoryBuilder; + import io.papermc.paper.math.BlockPosition; + import io.papermc.paper.math.FinePosition; + import io.papermc.paper.math.Position; ++import com.google.gson.JsonArray; ++import com.google.gson.JsonObject; ++import com.google.gson.internal.Streams; ++import com.google.gson.stream.JsonWriter; ++import com.mojang.datafixers.util.Either; + import it.unimi.dsi.fastutil.objects.ObjectRBTreeSet; + import java.lang.ref.Cleaner; ++import it.unimi.dsi.fastutil.objects.ReferenceArrayList; + import net.minecraft.core.BlockPos; + import net.minecraft.core.Direction; + import net.minecraft.core.Vec3i; + import net.minecraft.server.MinecraftServer; ++import net.minecraft.server.level.ChunkHolder; ++import net.minecraft.server.level.ChunkMap; ++import net.minecraft.server.level.DistanceManager; + import net.minecraft.server.level.ServerLevel; ++import net.minecraft.server.level.ServerPlayer; ++import net.minecraft.server.level.Ticket; + import net.minecraft.world.entity.Entity; + import net.minecraft.world.level.ChunkPos; + import net.minecraft.world.level.ClipContext; + import net.minecraft.world.level.Level; ++import net.minecraft.world.level.chunk.ChunkAccess; ++import net.minecraft.world.level.chunk.status.ChunkStatus; + import net.minecraft.world.phys.Vec3; + import org.apache.commons.lang.exception.ExceptionUtils; + import com.mojang.authlib.GameProfile; +@@ -30,8 +43,11 @@ import org.spigotmc.AsyncCatcher; + + import javax.annotation.Nonnull; + import javax.annotation.Nullable; ++import java.io.*; ++import java.nio.charset.StandardCharsets; + import java.util.List; + import java.util.Queue; ++import java.util.Set; + import java.util.concurrent.CompletableFuture; + import java.util.concurrent.ExecutionException; + import java.util.concurrent.LinkedBlockingQueue; +@@ -532,6 +548,98 @@ public final class MCUtil { + } + } + ++ public static ChunkStatus getChunkStatus(ChunkHolder chunk) { ++ return chunk.getChunkHolderStatus(); ++ } ++ ++ public static void dumpChunks(File file, boolean watchdog) throws IOException { ++ file.getParentFile().mkdirs(); ++ file.createNewFile(); ++ ReferenceArrayList<org.bukkit.World> worlds = new ReferenceArrayList<>(org.bukkit.Bukkit.getWorlds()); ++ ReferenceArrayList<org.bukkit.World> loadedWorlds = new ReferenceArrayList<>(worlds); ++ JsonObject data = new JsonObject(); ++ ++ data.addProperty("server-version", org.bukkit.Bukkit.getVersion()); ++ data.addProperty("data-version", 1); ++ ++ { ++ JsonArray players = new JsonArray(); ++ data.add("all-players", players); ++ List<ServerPlayer> playerList = MinecraftServer.getServer().getPlayerList().players; ++ for (ServerPlayer player : playerList) { ++ JsonObject playerData = new JsonObject(); ++ players.add(playerData); ++ ++ Level playerWorld = player.level(); ++ org.bukkit.World craftWorld = playerWorld.getWorld(); ++ Entity.RemovalReason removalReason = player.getRemovalReason(); ++ ++ playerData.addProperty("name", player.getScoreboardName()); ++ playerData.addProperty("x", player.getX()); ++ playerData.addProperty("y", player.getY()); ++ playerData.addProperty("z", player.getZ()); ++ playerData.addProperty("world", playerWorld == null ? "null world" : craftWorld.getName()); ++ playerData.addProperty("removalReason", removalReason == null ? "null" : removalReason.name()); ++ ++ if (!worlds.contains(craftWorld)) { ++ worlds.add(craftWorld); ++ } ++ } ++ } ++ ++ JsonArray chunkWaitInformation = new JsonArray(); ++ data.add("chunk-wait-infos", chunkWaitInformation); ++ ++ for (io.papermc.paper.chunk.system.scheduling.ChunkTaskScheduler.ChunkInfo chunkInfo : io.papermc.paper.chunk.system.scheduling.ChunkTaskScheduler.getChunkInfos()) { ++ chunkWaitInformation.add(chunkInfo.toString()); ++ } ++ ++ JsonArray worldsData = new JsonArray(); ++ ++ for (org.bukkit.World bukkitWorld : worlds) { ++ JsonObject worldData = new JsonObject(); ++ ++ ServerLevel world = ((org.bukkit.craftbukkit.CraftWorld)bukkitWorld).getHandle(); ++ List<ServerPlayer> players = world.players(); ++ ++ worldData.addProperty("is-loaded", loadedWorlds.contains(bukkitWorld)); ++ worldData.addProperty("name", world.getWorld().getName()); ++ worldData.addProperty("view-distance", world.getWorld().getViewDistance()); // Paper - replace chunk loader system ++ worldData.addProperty("tick-view-distance", world.getWorld().getSimulationDistance()); // Paper - replace chunk loader system ++ ++ JsonArray playersData = new JsonArray(); ++ ++ for (ServerPlayer player : players) { ++ JsonObject playerData = new JsonObject(); ++ ++ playerData.addProperty("name", player.getScoreboardName()); ++ playerData.addProperty("x", player.getX()); ++ playerData.addProperty("y", player.getY()); ++ playerData.addProperty("z", player.getZ()); ++ ++ playersData.add(playerData); ++ } ++ ++ worldData.add("players", playersData); ++ worldData.add("chunk-data", watchdog ? world.chunkTaskScheduler.chunkHolderManager.getDebugJsonForWatchdog() : world.chunkTaskScheduler.chunkHolderManager.getDebugJson()); ++ worldsData.add(worldData); ++ } ++ ++ data.add("worlds", worldsData); ++ ++ StringWriter stringWriter = new StringWriter(); ++ JsonWriter jsonWriter = new JsonWriter(stringWriter); ++ jsonWriter.setIndent(" "); ++ jsonWriter.setLenient(false); ++ Streams.write(data, jsonWriter); ++ ++ String fileData = stringWriter.toString(); ++ ++ try (PrintStream out = new PrintStream(new FileOutputStream(file), false, StandardCharsets.UTF_8)) { ++ out.print(fileData); ++ } ++ } ++ + public static int getTicketLevelFor(net.minecraft.world.level.chunk.status.ChunkStatus status) { + return net.minecraft.server.level.ChunkMap.MAX_VIEW_DISTANCE + net.minecraft.world.level.chunk.status.ChunkStatus.getDistance(status); + } +diff --git a/src/main/java/io/papermc/paper/util/TickThread.java b/src/main/java/io/papermc/paper/util/TickThread.java +index 73e83d56a340f0c7dcb8ff737d621003e72c6de4..bdaf062f9b66ceab303a0807eca301342886a8ea 100644 +--- a/src/main/java/io/papermc/paper/util/TickThread.java ++++ b/src/main/java/io/papermc/paper/util/TickThread.java +@@ -1,12 +1,20 @@ + package io.papermc.paper.util; + ++import net.minecraft.core.BlockPos; + import net.minecraft.server.MinecraftServer; + import net.minecraft.server.level.ServerLevel; ++import net.minecraft.server.level.ServerPlayer; ++import net.minecraft.server.network.ServerGamePacketListenerImpl; ++import net.minecraft.util.Mth; + import net.minecraft.world.entity.Entity; ++import net.minecraft.world.level.ChunkPos; ++import net.minecraft.world.level.Level; ++import net.minecraft.world.phys.AABB; ++import net.minecraft.world.phys.Vec3; + import org.bukkit.Bukkit; + import java.util.concurrent.atomic.AtomicInteger; + +-public final class TickThread extends Thread { ++public class TickThread extends Thread { + + public static final boolean STRICT_THREAD_CHECKS = Boolean.getBoolean("paper.strict-thread-checks"); + +@@ -16,6 +24,10 @@ public final class TickThread extends Thread { + } + } + ++ /** ++ * @deprecated ++ */ ++ @Deprecated + public static void softEnsureTickThread(final String reason) { + if (!STRICT_THREAD_CHECKS) { + return; +@@ -23,6 +35,10 @@ public final class TickThread extends Thread { + ensureTickThread(reason); + } + ++ /** ++ * @deprecated ++ */ ++ @Deprecated + public static void ensureTickThread(final String reason) { + if (!isTickThread()) { + MinecraftServer.LOGGER.error("Thread " + Thread.currentThread().getName() + " failed main thread check: " + reason, new Throwable()); +@@ -30,6 +46,20 @@ public final class TickThread extends Thread { + } + } + ++ public static void ensureTickThread(final ServerLevel world, final BlockPos pos, final String reason) { ++ if (!isTickThreadFor(world, pos)) { ++ MinecraftServer.LOGGER.error("Thread " + Thread.currentThread().getName() + " failed main thread check: " + reason, new Throwable()); ++ throw new IllegalStateException(reason); ++ } ++ } ++ ++ public static void ensureTickThread(final ServerLevel world, final ChunkPos pos, final String reason) { ++ if (!isTickThreadFor(world, pos)) { ++ MinecraftServer.LOGGER.error("Thread " + Thread.currentThread().getName() + " failed main thread check: " + reason, new Throwable()); ++ throw new IllegalStateException(reason); ++ } ++ } ++ + public static void ensureTickThread(final ServerLevel world, final int chunkX, final int chunkZ, final String reason) { + if (!isTickThreadFor(world, chunkX, chunkZ)) { + MinecraftServer.LOGGER.error("Thread " + Thread.currentThread().getName() + " failed main thread check: " + reason, new Throwable()); +@@ -44,6 +74,20 @@ public final class TickThread extends Thread { + } + } + ++ public static void ensureTickThread(final ServerLevel world, final AABB aabb, final String reason) { ++ if (!isTickThreadFor(world, aabb)) { ++ MinecraftServer.LOGGER.error("Thread " + Thread.currentThread().getName() + " failed main thread check: " + reason, new Throwable()); ++ throw new IllegalStateException(reason); ++ } ++ } ++ ++ public static void ensureTickThread(final ServerLevel world, final double blockX, final double blockZ, final String reason) { ++ if (!isTickThreadFor(world, blockX, blockZ)) { ++ MinecraftServer.LOGGER.error("Thread " + Thread.currentThread().getName() + " failed main thread check: " + reason, new Throwable()); ++ throw new IllegalStateException(reason); ++ } ++ } ++ + public final int id; /* We don't override getId as the spec requires that it be unique (with respect to all other threads) */ + + private static final AtomicInteger ID_GENERATOR = new AtomicInteger(); +@@ -66,13 +110,45 @@ public final class TickThread extends Thread { + } + + public static boolean isTickThread() { +- return Bukkit.isPrimaryThread(); ++ return Thread.currentThread() instanceof TickThread; ++ } ++ ++ public static boolean isShutdownThread() { ++ return false; ++ } ++ ++ public static boolean isTickThreadFor(final ServerLevel world, final BlockPos pos) { ++ return isTickThread(); ++ } ++ ++ public static boolean isTickThreadFor(final ServerLevel world, final ChunkPos pos) { ++ return isTickThread(); ++ } ++ ++ public static boolean isTickThreadFor(final ServerLevel world, final Vec3 pos) { ++ return isTickThread(); + } + + public static boolean isTickThreadFor(final ServerLevel world, final int chunkX, final int chunkZ) { + return isTickThread(); + } + ++ public static boolean isTickThreadFor(final ServerLevel world, final AABB aabb) { ++ return isTickThread(); ++ } ++ ++ public static boolean isTickThreadFor(final ServerLevel world, final double blockX, final double blockZ) { ++ return isTickThread(); ++ } ++ ++ public static boolean isTickThreadFor(final ServerLevel world, final Vec3 position, final Vec3 deltaMovement, final int buffer) { ++ return isTickThread(); ++ } ++ ++ public static boolean isTickThreadFor(final ServerLevel world, final int fromChunkX, final int fromChunkZ, final int toChunkX, final int toChunkZ) { ++ return isTickThread(); ++ } ++ + public static boolean isTickThreadFor(final ServerLevel world, final int chunkX, final int chunkZ, final int radius) { + return isTickThread(); + } +diff --git a/src/main/java/io/papermc/paper/world/ChunkEntitySlices.java b/src/main/java/io/papermc/paper/world/ChunkEntitySlices.java +new file mode 100644 +index 0000000000000000000000000000000000000000..c78cbec447032de9fe69748591bef6be300160ed +--- /dev/null ++++ b/src/main/java/io/papermc/paper/world/ChunkEntitySlices.java +@@ -0,0 +1,607 @@ ++package io.papermc.paper.world; ++ ++import com.destroystokyo.paper.util.maplist.EntityList; ++import io.papermc.paper.chunk.system.entity.EntityLookup; ++import io.papermc.paper.util.TickThread; ++import it.unimi.dsi.fastutil.objects.Reference2ObjectMap; ++import it.unimi.dsi.fastutil.objects.Reference2ObjectOpenHashMap; ++import net.minecraft.nbt.CompoundTag; ++import net.minecraft.server.level.ChunkHolder; ++import net.minecraft.server.level.FullChunkStatus; ++import net.minecraft.server.level.ServerLevel; ++import net.minecraft.util.Mth; ++import net.minecraft.world.entity.Entity; ++import net.minecraft.world.entity.EntityType; ++import net.minecraft.world.entity.boss.EnderDragonPart; ++import net.minecraft.world.entity.boss.enderdragon.EnderDragon; ++import net.minecraft.world.level.ChunkPos; ++import net.minecraft.world.level.chunk.storage.EntityStorage; ++import net.minecraft.world.level.entity.Visibility; ++import net.minecraft.world.phys.AABB; ++import org.bukkit.craftbukkit.event.CraftEventFactory; ++import java.util.ArrayList; ++import java.util.Arrays; ++import java.util.Iterator; ++import java.util.List; ++import java.util.function.Predicate; ++import org.bukkit.event.entity.EntityRemoveEvent; ++ ++public final class ChunkEntitySlices { ++ ++ protected final int minSection; ++ protected final int maxSection; ++ public final int chunkX; ++ public final int chunkZ; ++ protected final ServerLevel world; ++ ++ protected final EntityCollectionBySection allEntities; ++ protected final EntityCollectionBySection hardCollidingEntities; ++ protected final Reference2ObjectOpenHashMap<Class<? extends Entity>, EntityCollectionBySection> entitiesByClass; ++ protected final EntityList entities = new EntityList(); ++ ++ public FullChunkStatus status; ++ ++ protected boolean isTransient; ++ ++ public boolean isTransient() { ++ return this.isTransient; ++ } ++ ++ public void setTransient(final boolean value) { ++ this.isTransient = value; ++ } ++ ++ // TODO implement container search optimisations ++ ++ public ChunkEntitySlices(final ServerLevel world, final int chunkX, final int chunkZ, final FullChunkStatus status, ++ final int minSection, final int maxSection) { // inclusive, inclusive ++ this.minSection = minSection; ++ this.maxSection = maxSection; ++ this.chunkX = chunkX; ++ this.chunkZ = chunkZ; ++ this.world = world; ++ ++ this.allEntities = new EntityCollectionBySection(this); ++ this.hardCollidingEntities = new EntityCollectionBySection(this); ++ this.entitiesByClass = new Reference2ObjectOpenHashMap<>(); ++ ++ this.status = status; ++ } ++ ++ // Paper start - optimise CraftChunk#getEntities ++ public org.bukkit.entity.Entity[] getChunkEntities() { ++ List<org.bukkit.entity.Entity> ret = new java.util.ArrayList<>(); ++ final Entity[] entities = this.entities.getRawData(); ++ for (int i = 0, size = Math.min(entities.length, this.entities.size()); i < size; ++i) { ++ final Entity entity = entities[i]; ++ if (entity == null) { ++ continue; ++ } ++ final org.bukkit.entity.Entity bukkit = entity.getBukkitEntity(); ++ if (bukkit != null && bukkit.isValid()) { ++ ret.add(bukkit); ++ } ++ } ++ ++ return ret.toArray(new org.bukkit.entity.Entity[0]); ++ } ++ ++ public CompoundTag save() { ++ final int len = this.entities.size(); ++ if (len == 0) { ++ return null; ++ } ++ ++ final Entity[] rawData = this.entities.getRawData(); ++ final List<Entity> collectedEntities = new ArrayList<>(len); ++ for (int i = 0; i < len; ++i) { ++ final Entity entity = rawData[i]; ++ if (entity.shouldBeSaved()) { ++ collectedEntities.add(entity); ++ } ++ } ++ ++ if (collectedEntities.isEmpty()) { ++ return null; ++ } ++ ++ return EntityStorage.saveEntityChunk(collectedEntities, new ChunkPos(this.chunkX, this.chunkZ), this.world); ++ } ++ ++ // returns true if this chunk has transient entities remaining ++ public boolean unload() { ++ final int len = this.entities.size(); ++ final Entity[] collectedEntities = Arrays.copyOf(this.entities.getRawData(), len); ++ ++ for (int i = 0; i < len; ++i) { ++ final Entity entity = collectedEntities[i]; ++ if (entity.isRemoved()) { ++ // removed by us below ++ continue; ++ } ++ if (entity.shouldBeSaved()) { ++ entity.setRemoved(Entity.RemovalReason.UNLOADED_TO_CHUNK, EntityRemoveEvent.Cause.UNLOAD); ++ if (entity.isVehicle()) { ++ // we cannot assume that these entities are contained within this chunk, because entities can ++ // desync - so we need to remove them all ++ for (final Entity passenger : entity.getIndirectPassengers()) { ++ passenger.setRemoved(Entity.RemovalReason.UNLOADED_TO_CHUNK, EntityRemoveEvent.Cause.UNLOAD); ++ } ++ } ++ } ++ } ++ ++ return this.entities.size() != 0; ++ } ++ ++ private List<Entity> getAllEntities() { ++ final int len = this.entities.size(); ++ if (len == 0) { ++ return new ArrayList<>(); ++ } ++ ++ final Entity[] rawData = this.entities.getRawData(); ++ final List<Entity> collectedEntities = new ArrayList<>(len); ++ for (int i = 0; i < len; ++i) { ++ collectedEntities.add(rawData[i]); ++ } ++ ++ return collectedEntities; ++ } ++ ++ public void callEntitiesLoadEvent() { ++ CraftEventFactory.callEntitiesLoadEvent(this.world, new ChunkPos(this.chunkX, this.chunkZ), this.getAllEntities()); ++ } ++ ++ public void callEntitiesUnloadEvent() { ++ CraftEventFactory.callEntitiesUnloadEvent(this.world, new ChunkPos(this.chunkX, this.chunkZ), this.getAllEntities()); ++ } ++ // Paper end - optimise CraftChunk#getEntities ++ ++ public boolean isEmpty() { ++ return this.entities.size() == 0; ++ } ++ ++ public void mergeInto(final ChunkEntitySlices slices) { ++ final Entity[] entities = this.entities.getRawData(); ++ for (int i = 0, size = Math.min(entities.length, this.entities.size()); i < size; ++i) { ++ final Entity entity = entities[i]; ++ slices.addEntity(entity, entity.sectionY); ++ } ++ } ++ ++ private boolean preventStatusUpdates; ++ public boolean startPreventingStatusUpdates() { ++ final boolean ret = this.preventStatusUpdates; ++ this.preventStatusUpdates = true; ++ return ret; ++ } ++ ++ public boolean isPreventingStatusUpdates() { ++ return this.preventStatusUpdates; ++ } ++ ++ public void stopPreventingStatusUpdates(final boolean prev) { ++ this.preventStatusUpdates = prev; ++ } ++ ++ public void updateStatus(final FullChunkStatus status, final EntityLookup lookup) { ++ this.status = status; ++ ++ final Entity[] entities = this.entities.getRawData(); ++ ++ for (int i = 0, size = this.entities.size(); i < size; ++i) { ++ final Entity entity = entities[i]; ++ ++ final Visibility oldVisibility = EntityLookup.getEntityStatus(entity); ++ entity.chunkStatus = status; ++ final Visibility newVisibility = EntityLookup.getEntityStatus(entity); ++ ++ lookup.entityStatusChange(entity, this, oldVisibility, newVisibility, false, false, false); ++ } ++ } ++ ++ public boolean addEntity(final Entity entity, final int chunkSection) { ++ if (!this.entities.add(entity)) { ++ return false; ++ } ++ entity.chunkStatus = this.status; ++ final int sectionIndex = chunkSection - this.minSection; ++ ++ this.allEntities.addEntity(entity, sectionIndex); ++ ++ if (entity.hardCollides()) { ++ this.hardCollidingEntities.addEntity(entity, sectionIndex); ++ } ++ ++ for (final Iterator<Reference2ObjectMap.Entry<Class<? extends Entity>, EntityCollectionBySection>> iterator = ++ this.entitiesByClass.reference2ObjectEntrySet().fastIterator(); iterator.hasNext();) { ++ final Reference2ObjectMap.Entry<Class<? extends Entity>, EntityCollectionBySection> entry = iterator.next(); ++ ++ if (entry.getKey().isInstance(entity)) { ++ entry.getValue().addEntity(entity, sectionIndex); ++ } ++ } ++ ++ return true; ++ } ++ ++ public boolean removeEntity(final Entity entity, final int chunkSection) { ++ if (!this.entities.remove(entity)) { ++ return false; ++ } ++ entity.chunkStatus = null; ++ final int sectionIndex = chunkSection - this.minSection; ++ ++ this.allEntities.removeEntity(entity, sectionIndex); ++ ++ if (entity.hardCollides()) { ++ this.hardCollidingEntities.removeEntity(entity, sectionIndex); ++ } ++ ++ for (final Iterator<Reference2ObjectMap.Entry<Class<? extends Entity>, EntityCollectionBySection>> iterator = ++ this.entitiesByClass.reference2ObjectEntrySet().fastIterator(); iterator.hasNext();) { ++ final Reference2ObjectMap.Entry<Class<? extends Entity>, EntityCollectionBySection> entry = iterator.next(); ++ ++ if (entry.getKey().isInstance(entity)) { ++ entry.getValue().removeEntity(entity, sectionIndex); ++ } ++ } ++ ++ return true; ++ } ++ ++ public void getHardCollidingEntities(final Entity except, final AABB box, final List<Entity> into, final Predicate<? super Entity> predicate) { ++ this.hardCollidingEntities.getEntities(except, box, into, predicate); ++ } ++ ++ public void getEntities(final Entity except, final AABB box, final List<Entity> into, final Predicate<? super Entity> predicate) { ++ this.allEntities.getEntitiesWithEnderDragonParts(except, box, into, predicate); ++ } ++ ++ public void getEntitiesWithoutDragonParts(final Entity except, final AABB box, final List<Entity> into, final Predicate<? super Entity> predicate) { ++ this.allEntities.getEntities(except, box, into, predicate); ++ } ++ ++ public <T extends Entity> void getEntities(final EntityType<?> type, final AABB box, final List<? super T> into, ++ final Predicate<? super T> predicate) { ++ this.allEntities.getEntities(type, box, (List)into, (Predicate)predicate); ++ } ++ ++ protected EntityCollectionBySection initClass(final Class<? extends Entity> clazz) { ++ final EntityCollectionBySection ret = new EntityCollectionBySection(this); ++ ++ for (int sectionIndex = 0; sectionIndex < this.allEntities.entitiesBySection.length; ++sectionIndex) { ++ final BasicEntityList<Entity> sectionEntities = this.allEntities.entitiesBySection[sectionIndex]; ++ if (sectionEntities == null) { ++ continue; ++ } ++ ++ final Entity[] storage = sectionEntities.storage; ++ ++ for (int i = 0, len = Math.min(storage.length, sectionEntities.size()); i < len; ++i) { ++ final Entity entity = storage[i]; ++ ++ if (clazz.isInstance(entity)) { ++ ret.addEntity(entity, sectionIndex); ++ } ++ } ++ } ++ ++ return ret; ++ } ++ ++ public <T extends Entity> void getEntities(final Class<? extends T> clazz, final Entity except, final AABB box, final List<? super T> into, ++ final Predicate<? super T> predicate) { ++ EntityCollectionBySection collection = this.entitiesByClass.get(clazz); ++ if (collection != null) { ++ collection.getEntitiesWithEnderDragonParts(except, clazz, box, (List)into, (Predicate)predicate); ++ } else { ++ this.entitiesByClass.putIfAbsent(clazz, collection = this.initClass(clazz)); ++ collection.getEntitiesWithEnderDragonParts(except, clazz, box, (List)into, (Predicate)predicate); ++ } ++ } ++ ++ protected static final class BasicEntityList<E extends Entity> { ++ ++ protected static final Entity[] EMPTY = new Entity[0]; ++ protected static final int DEFAULT_CAPACITY = 4; ++ ++ protected E[] storage; ++ protected int size; ++ ++ public BasicEntityList() { ++ this(0); ++ } ++ ++ public BasicEntityList(final int cap) { ++ this.storage = (E[])(cap <= 0 ? EMPTY : new Entity[cap]); ++ } ++ ++ public boolean isEmpty() { ++ return this.size == 0; ++ } ++ ++ public int size() { ++ return this.size; ++ } ++ ++ private void resize() { ++ if (this.storage == EMPTY) { ++ this.storage = (E[])new Entity[DEFAULT_CAPACITY]; ++ } else { ++ this.storage = Arrays.copyOf(this.storage, this.storage.length * 2); ++ } ++ } ++ ++ public void add(final E entity) { ++ final int idx = this.size++; ++ if (idx >= this.storage.length) { ++ this.resize(); ++ this.storage[idx] = entity; ++ } else { ++ this.storage[idx] = entity; ++ } ++ } ++ ++ public int indexOf(final E entity) { ++ final E[] storage = this.storage; ++ ++ for (int i = 0, len = Math.min(this.storage.length, this.size); i < len; ++i) { ++ if (storage[i] == entity) { ++ return i; ++ } ++ } ++ ++ return -1; ++ } ++ ++ public boolean remove(final E entity) { ++ final int idx = this.indexOf(entity); ++ if (idx == -1) { ++ return false; ++ } ++ ++ final int size = --this.size; ++ final E[] storage = this.storage; ++ if (idx != size) { ++ System.arraycopy(storage, idx + 1, storage, idx, size - idx); ++ } ++ ++ storage[size] = null; ++ ++ return true; ++ } ++ ++ public boolean has(final E entity) { ++ return this.indexOf(entity) != -1; ++ } ++ } ++ ++ protected static final class EntityCollectionBySection { ++ ++ protected final ChunkEntitySlices manager; ++ protected final long[] nonEmptyBitset; ++ protected final BasicEntityList<Entity>[] entitiesBySection; ++ protected int count; ++ ++ public EntityCollectionBySection(final ChunkEntitySlices manager) { ++ this.manager = manager; ++ ++ final int sectionCount = manager.maxSection - manager.minSection + 1; ++ ++ this.nonEmptyBitset = new long[(sectionCount + (Long.SIZE - 1)) >>> 6]; // (sectionCount + (Long.SIZE - 1)) / Long.SIZE ++ this.entitiesBySection = new BasicEntityList[sectionCount]; ++ } ++ ++ public void addEntity(final Entity entity, final int sectionIndex) { ++ BasicEntityList<Entity> list = this.entitiesBySection[sectionIndex]; ++ ++ if (list != null && list.has(entity)) { ++ return; ++ } ++ ++ if (list == null) { ++ this.entitiesBySection[sectionIndex] = list = new BasicEntityList<>(); ++ this.nonEmptyBitset[sectionIndex >>> 6] |= (1L << (sectionIndex & (Long.SIZE - 1))); ++ } ++ ++ list.add(entity); ++ ++this.count; ++ } ++ ++ public void removeEntity(final Entity entity, final int sectionIndex) { ++ final BasicEntityList<Entity> list = this.entitiesBySection[sectionIndex]; ++ ++ if (list == null || !list.remove(entity)) { ++ return; ++ } ++ ++ --this.count; ++ ++ if (list.isEmpty()) { ++ this.entitiesBySection[sectionIndex] = null; ++ this.nonEmptyBitset[sectionIndex >>> 6] ^= (1L << (sectionIndex & (Long.SIZE - 1))); ++ } ++ } ++ ++ public void getEntities(final Entity except, final AABB box, final List<Entity> into, final Predicate<? super Entity> predicate) { ++ if (this.count == 0) { ++ return; ++ } ++ ++ final int minSection = this.manager.minSection; ++ final int maxSection = this.manager.maxSection; ++ ++ final int min = Mth.clamp(Mth.floor(box.minY - 2.0) >> 4, minSection, maxSection); ++ final int max = Mth.clamp(Mth.floor(box.maxY + 2.0) >> 4, minSection, maxSection); ++ ++ final BasicEntityList<Entity>[] entitiesBySection = this.entitiesBySection; ++ ++ for (int section = min; section <= max; ++section) { ++ final BasicEntityList<Entity> list = entitiesBySection[section - minSection]; ++ ++ if (list == null) { ++ continue; ++ } ++ ++ final Entity[] storage = list.storage; ++ ++ for (int i = 0, len = Math.min(storage.length, list.size()); i < len; ++i) { ++ final Entity entity = storage[i]; ++ ++ if (entity == null || entity == except || !entity.getBoundingBox().intersects(box)) { ++ continue; ++ } ++ ++ if (predicate != null && !predicate.test(entity)) { ++ continue; ++ } ++ ++ into.add(entity); ++ } ++ } ++ } ++ ++ public void getEntitiesWithEnderDragonParts(final Entity except, final AABB box, final List<Entity> into, ++ final Predicate<? super Entity> predicate) { ++ if (this.count == 0) { ++ return; ++ } ++ ++ final int minSection = this.manager.minSection; ++ final int maxSection = this.manager.maxSection; ++ ++ final int min = Mth.clamp(Mth.floor(box.minY - 2.0) >> 4, minSection, maxSection); ++ final int max = Mth.clamp(Mth.floor(box.maxY + 2.0) >> 4, minSection, maxSection); ++ ++ final BasicEntityList<Entity>[] entitiesBySection = this.entitiesBySection; ++ ++ for (int section = min; section <= max; ++section) { ++ final BasicEntityList<Entity> list = entitiesBySection[section - minSection]; ++ ++ if (list == null) { ++ continue; ++ } ++ ++ final Entity[] storage = list.storage; ++ ++ for (int i = 0, len = Math.min(storage.length, list.size()); i < len; ++i) { ++ final Entity entity = storage[i]; ++ ++ if (entity == null || entity == except || !entity.getBoundingBox().intersects(box)) { ++ continue; ++ } ++ ++ if (predicate == null || predicate.test(entity)) { ++ into.add(entity); ++ } // else: continue to test the ender dragon parts ++ ++ if (entity instanceof EnderDragon) { ++ for (final EnderDragonPart part : ((EnderDragon)entity).subEntities) { ++ if (part == except || !part.getBoundingBox().intersects(box)) { ++ continue; ++ } ++ ++ if (predicate != null && !predicate.test(part)) { ++ continue; ++ } ++ ++ into.add(part); ++ } ++ } ++ } ++ } ++ } ++ ++ public void getEntitiesWithEnderDragonParts(final Entity except, final Class<?> clazz, final AABB box, final List<Entity> into, ++ final Predicate<? super Entity> predicate) { ++ if (this.count == 0) { ++ return; ++ } ++ ++ final int minSection = this.manager.minSection; ++ final int maxSection = this.manager.maxSection; ++ ++ final int min = Mth.clamp(Mth.floor(box.minY - 2.0) >> 4, minSection, maxSection); ++ final int max = Mth.clamp(Mth.floor(box.maxY + 2.0) >> 4, minSection, maxSection); ++ ++ final BasicEntityList<Entity>[] entitiesBySection = this.entitiesBySection; ++ ++ for (int section = min; section <= max; ++section) { ++ final BasicEntityList<Entity> list = entitiesBySection[section - minSection]; ++ ++ if (list == null) { ++ continue; ++ } ++ ++ final Entity[] storage = list.storage; ++ ++ for (int i = 0, len = Math.min(storage.length, list.size()); i < len; ++i) { ++ final Entity entity = storage[i]; ++ ++ if (entity == null || entity == except || !entity.getBoundingBox().intersects(box)) { ++ continue; ++ } ++ ++ if (predicate == null || predicate.test(entity)) { ++ into.add(entity); ++ } // else: continue to test the ender dragon parts ++ ++ if (entity instanceof EnderDragon) { ++ for (final EnderDragonPart part : ((EnderDragon)entity).subEntities) { ++ if (part == except || !part.getBoundingBox().intersects(box) || !clazz.isInstance(part)) { ++ continue; ++ } ++ ++ if (predicate != null && !predicate.test(part)) { ++ continue; ++ } ++ ++ into.add(part); ++ } ++ } ++ } ++ } ++ } ++ ++ public <T extends Entity> void getEntities(final EntityType<?> type, final AABB box, final List<? super T> into, ++ final Predicate<? super T> predicate) { ++ if (this.count == 0) { ++ return; ++ } ++ ++ final int minSection = this.manager.minSection; ++ final int maxSection = this.manager.maxSection; ++ ++ final int min = Mth.clamp(Mth.floor(box.minY - 2.0) >> 4, minSection, maxSection); ++ final int max = Mth.clamp(Mth.floor(box.maxY + 2.0) >> 4, minSection, maxSection); ++ ++ final BasicEntityList<Entity>[] entitiesBySection = this.entitiesBySection; ++ ++ for (int section = min; section <= max; ++section) { ++ final BasicEntityList<Entity> list = entitiesBySection[section - minSection]; ++ ++ if (list == null) { ++ continue; ++ } ++ ++ final Entity[] storage = list.storage; ++ ++ for (int i = 0, len = Math.min(storage.length, list.size()); i < len; ++i) { ++ final Entity entity = storage[i]; ++ ++ if (entity == null || (type != null && entity.getType() != type) || !entity.getBoundingBox().intersects(box)) { ++ continue; ++ } ++ ++ if (predicate != null && !predicate.test((T)entity)) { ++ continue; ++ } ++ ++ into.add((T)entity); ++ } ++ } ++ } ++ } ++} +diff --git a/src/main/java/net/minecraft/server/Main.java b/src/main/java/net/minecraft/server/Main.java +index c33f85b570f159ab465b5a10a8044a81f2797f43..244a19ecd0234fa1d7a6ecfea20751595688605d 100644 +--- a/src/main/java/net/minecraft/server/Main.java ++++ b/src/main/java/net/minecraft/server/Main.java +@@ -320,6 +320,7 @@ public class Main { + + convertable_conversionsession.saveDataTag(iregistrycustom_dimension, savedata); + */ ++ Class.forName(net.minecraft.world.entity.npc.VillagerTrades.class.getName()); // Paper - load this sync so it won't fail later async + final DedicatedServer dedicatedserver = (DedicatedServer) MinecraftServer.spin((thread) -> { + DedicatedServer dedicatedserver1 = new DedicatedServer(optionset, worldLoader.get(), thread, convertable_conversionsession, resourcepackrepository, worldstem, dedicatedserversettings, DataFixers.getDataFixer(), services, LoggerChunkProgressListener::createFromGameruleRadius); + +diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java +index 325ba58a1c79fd928ac22d8f1ef93605357300d2..498fc4ab46eac994f2a65c79eebddca2813f0b65 100644 +--- a/src/main/java/net/minecraft/server/MinecraftServer.java ++++ b/src/main/java/net/minecraft/server/MinecraftServer.java +@@ -318,7 +318,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa + + public static <S extends MinecraftServer> S spin(Function<Thread, S> serverFactory) { + AtomicReference<S> atomicreference = new AtomicReference(); +- Thread thread = new Thread(() -> { ++ Thread thread = new io.papermc.paper.util.TickThread(() -> { // Paper - rewrite chunk system + ((MinecraftServer) atomicreference.get()).runServer(); + }, "Server thread"); + +@@ -654,7 +654,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa + this.forceDifficulty(); + for (ServerLevel worldserver : this.getAllLevels()) { + this.prepareLevels(worldserver.getChunkSource().chunkMap.progressListener, worldserver); +- worldserver.entityManager.tick(); // SPIGOT-6526: Load pending entities so they are available to the API ++ //worldserver.entityManager.tick(); // SPIGOT-6526: Load pending entities so they are available to the API // Paper - rewrite chunk system, not required to "tick" anything + this.server.getPluginManager().callEvent(new org.bukkit.event.world.WorldLoadEvent(worldserver.getWorld())); + } + +@@ -864,6 +864,12 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa + public abstract boolean shouldRconBroadcast(); + + public boolean saveAllChunks(boolean suppressLogs, boolean flush, boolean force) { ++ // Paper start - rewrite chunk system - add close param ++ // This allows us to avoid double saving chunks by closing instead of saving then closing ++ return this.saveAllChunks(suppressLogs, flush, force, false); ++ } ++ public boolean saveAllChunks(boolean suppressLogs, boolean flush, boolean force, boolean close) { ++ // Paper end - rewrite chunk system - add close param + boolean flag3 = false; + + for (Iterator iterator = this.getAllLevels().iterator(); iterator.hasNext(); flag3 = true) { +@@ -872,8 +878,12 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa + if (!suppressLogs) { + MinecraftServer.LOGGER.info("Saving chunks for level '{}'/{}", worldserver, worldserver.dimension().location()); + } +- +- worldserver.save((ProgressListener) null, flush, worldserver.noSave && !force); ++ // Paper start - rewrite chunk system ++ worldserver.save((ProgressListener) null, flush, worldserver.noSave && !force, close); ++ if (flush) { ++ MinecraftServer.LOGGER.info("ThreadedAnvilChunkStorage ({}): All chunks are saved", worldserver.getChunkSource().chunkMap.getStorageName()); ++ } ++ // Paper end - rewrite chunk system + } + + // CraftBukkit start - moved to WorldServer.save +@@ -892,7 +902,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa + while (iterator1.hasNext()) { + ServerLevel worldserver2 = (ServerLevel) iterator1.next(); + +- MinecraftServer.LOGGER.info("ThreadedAnvilChunkStorage ({}): All chunks are saved", worldserver2.getChunkSource().chunkMap.getStorageName()); ++ //MinecraftServer.LOGGER.info("ThreadedAnvilChunkStorage ({}): All chunks are saved", worldserver2.getChunkSource().chunkMap.getStorageName()); // Paper - move up + } + + MinecraftServer.LOGGER.info("ThreadedAnvilChunkStorage: All dimensions are saved"); +@@ -974,36 +984,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa + } + } + +- while (this.levels.values().stream().anyMatch((worldserver1) -> { +- return worldserver1.getChunkSource().chunkMap.hasWork(); +- })) { +- this.nextTickTimeNanos = Util.getNanos() + TimeUtil.NANOSECONDS_PER_MILLISECOND; +- iterator = this.getAllLevels().iterator(); +- +- while (iterator.hasNext()) { +- worldserver = (ServerLevel) iterator.next(); +- worldserver.getChunkSource().removeTicketsOnClosing(); +- worldserver.getChunkSource().tick(() -> { +- return true; +- }, false); +- } +- +- this.waitUntilNextTick(); +- } +- +- this.saveAllChunks(false, true, false); +- iterator = this.getAllLevels().iterator(); +- +- while (iterator.hasNext()) { +- worldserver = (ServerLevel) iterator.next(); +- if (worldserver != null) { +- try { +- worldserver.close(); +- } catch (IOException ioexception) { +- MinecraftServer.LOGGER.error("Exception closing the level", ioexception); +- } +- } +- } ++ this.saveAllChunks(false, true, false, true); // Paper - rewrite chunk system - move closing into here + + this.isSaving = false; + this.resources.close(); +@@ -1023,6 +1004,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa + } + // Spigot end + ++ io.papermc.paper.chunk.system.io.RegionFileIOThread.close(true); // Paper - rewrite chunk system + } + + public String getLocalIp() { +@@ -1115,6 +1097,8 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa + // Paper end + // Spigot End + ++ public static volatile RuntimeException chunkSystemCrash; // Paper - rewrite chunk system ++ + protected void runServer() { + try { + if (!this.initServer()) { +@@ -1143,6 +1127,12 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa + // Paper end - Add onboarding message for initial server start + + while (this.running) { ++ // Paper start - rewrite chunk system ++ // guarantee that nothing can stop the server from halting if it can at least still tick ++ if (this.chunkSystemCrash != null) { ++ throw this.chunkSystemCrash; ++ } ++ // Paper end - rewrite chunk system + long i; + + if (!this.isPaused() && this.tickRateManager.isSprinting() && this.tickRateManager.checkShouldSprintThisTick()) { +@@ -1305,6 +1295,11 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa + } + + private boolean haveTime() { ++ // Paper start ++ if (this.forceTicks) { ++ return true; ++ } ++ // Paper end + // CraftBukkit start + if (isOversleep) return canOversleep(); // Paper - because of our changes, this logic is broken + return this.forceTicks || this.runningTask() || Util.getNanos() < (this.mayHaveDelayedTasks ? this.delayedTasksMaxNextTickTimeNanos : this.nextTickTimeNanos); +@@ -1567,7 +1562,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa + // Paper start - Folia scheduler API + ((io.papermc.paper.threadedregions.scheduler.FoliaGlobalRegionScheduler) Bukkit.getGlobalRegionScheduler()).tick(); + getAllLevels().forEach(level -> { +- for (final Entity entity : level.getEntities().getAll()) { ++ for (final Entity entity : level.getEntityLookup().getAllCopy()) { // Paper - rewrite chunk system + if (entity.isRemoved()) { + continue; + } +@@ -2625,6 +2620,13 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa + + } + ++ // Paper start - rewrite chunk system ++ @Override ++ public boolean isSameThread() { ++ return io.papermc.paper.util.TickThread.isTickThread(); ++ } ++ // Paper end - rewrite chunk system ++ + // CraftBukkit start + public boolean isDebugging() { + return false; +diff --git a/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java b/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java +index 00679b76715fde4b90a999fd11cca40d048b1349..89c2c26afc5f06c4f57716cadbebabb8854f3635 100644 +--- a/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java ++++ b/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java +@@ -473,7 +473,34 @@ public class DedicatedServer extends MinecraftServer implements ServerInterface + return this.getProperties().allowNether; + } + ++ static final java.util.concurrent.atomic.AtomicInteger ASYNC_DEBUG_CHUNKS_COUNT = new java.util.concurrent.atomic.AtomicInteger(); // Paper - rewrite chunk system ++ + public void handleConsoleInput(String command, CommandSourceStack commandSource) { ++ // Paper start - rewrite chunk system ++ if (command.equalsIgnoreCase("paper debug chunks --async")) { ++ LOGGER.info("Scheduling async debug chunks"); ++ Runnable run = () -> { ++ LOGGER.info("Async debug chunks executing"); ++ io.papermc.paper.chunk.system.scheduling.ChunkTaskScheduler.dumpAllChunkLoadInfo(false); ++ CommandSender sender = MinecraftServer.getServer().console; ++ java.io.File file = new java.io.File(new java.io.File(new java.io.File("."), "debug"), ++ "chunks-" + java.time.format.DateTimeFormatter.ofPattern("yyyy-MM-dd_HH.mm.ss").format(java.time.LocalDateTime.now()) + ".txt"); ++ sender.sendMessage(net.kyori.adventure.text.Component.text("Writing chunk information dump to " + file, net.kyori.adventure.text.format.NamedTextColor.GREEN)); ++ try { ++ io.papermc.paper.util.MCUtil.dumpChunks(file, true); ++ sender.sendMessage(net.kyori.adventure.text.Component.text("Successfully written chunk information!", net.kyori.adventure.text.format.NamedTextColor.GREEN)); ++ } catch (Throwable thr) { ++ MinecraftServer.LOGGER.warn("Failed to dump chunk information to file " + file.toString(), thr); ++ sender.sendMessage(net.kyori.adventure.text.Component.text("Failed to dump chunk information, see console", net.kyori.adventure.text.format.NamedTextColor.RED)); ++ } ++ }; ++ Thread t = new Thread(run); ++ t.setName("Async debug thread #" + ASYNC_DEBUG_CHUNKS_COUNT.getAndIncrement()); ++ t.setDaemon(true); ++ t.start(); ++ return; ++ } ++ // Paper end - rewrite chunk system + this.serverCommandQueue.add(new ConsoleInput(command, commandSource)); // Paper - Perf: use proper queue + } + +diff --git a/src/main/java/net/minecraft/server/level/ChunkHolder.java b/src/main/java/net/minecraft/server/level/ChunkHolder.java +index 88729d92878f98729eb5669cce5ae5b1418865a1..13d15a135dd0373bef4a5ac9ffb56dbbf53353a0 100644 +--- a/src/main/java/net/minecraft/server/level/ChunkHolder.java ++++ b/src/main/java/net/minecraft/server/level/ChunkHolder.java +@@ -46,17 +46,12 @@ public class ChunkHolder { + public static final ChunkResult<ChunkAccess> NOT_DONE_YET = ChunkResult.error("Not done yet"); + private static final CompletableFuture<ChunkResult<LevelChunk>> UNLOADED_LEVEL_CHUNK_FUTURE = CompletableFuture.completedFuture(ChunkHolder.UNLOADED_LEVEL_CHUNK); + private static final List<ChunkStatus> CHUNK_STATUSES = ChunkStatus.getStatusList(); +- private final AtomicReferenceArray<CompletableFuture<ChunkResult<ChunkAccess>>> futures; ++ // Paper - rewrite chunk system + private final LevelHeightAccessor levelHeightAccessor; +- private volatile CompletableFuture<ChunkResult<LevelChunk>> fullChunkFuture; private int fullChunkCreateCount; private volatile boolean isFullChunkReady; // Paper - cache chunk ticking stage +- private volatile CompletableFuture<ChunkResult<LevelChunk>> tickingChunkFuture; private volatile boolean isTickingReady; // Paper - cache chunk ticking stage +- private volatile CompletableFuture<ChunkResult<LevelChunk>> entityTickingChunkFuture; private volatile boolean isEntityTickingReady; // Paper - cache chunk ticking stage +- public CompletableFuture<ChunkAccess> chunkToSave; // Paper - public ++ // Paper - rewrite chunk system + @Nullable + private final DebugBuffer<ChunkHolder.ChunkSaveDebug> chunkToSaveHistory; +- public int oldTicketLevel; +- private int ticketLevel; +- private int queueLevel; ++ // Paper - rewrite chunk system + public final ChunkPos pos; + private boolean hasChangedSections; + private final ShortSet[] changedBlocksPerSection; +@@ -65,11 +60,20 @@ public class ChunkHolder { + private final LevelLightEngine lightEngine; + private final ChunkHolder.LevelChangeListener onLevelChange; + public final ChunkHolder.PlayerProvider playerProvider; +- private boolean wasAccessibleSinceLastSave; +- private CompletableFuture<Void> pendingFullStateConfirmation; +- private CompletableFuture<?> sendSync; ++ // Paper - rewrite chunk system + + private final ChunkMap chunkMap; // Paper ++ // Paper start - no-tick view distance ++ public final LevelChunk getSendingChunk() { ++ // it's important that we use getChunkAtIfLoadedImmediately to mirror the chunk sending logic used ++ // in Chunk's neighbour callback ++ LevelChunk ret = this.chunkMap.level.getChunkSource().getChunkAtIfLoadedImmediately(this.pos.x, this.pos.z); ++ if (ret != null && ret.areNeighboursLoaded(1)) { ++ return ret; ++ } ++ return null; ++ } ++ // Paper end - no-tick view distance + + // Paper start + public void onChunkAdd() { +@@ -81,147 +85,131 @@ public class ChunkHolder { + } + // Paper end + +- public ChunkHolder(ChunkPos pos, int level, LevelHeightAccessor world, LevelLightEngine lightingProvider, ChunkHolder.LevelChangeListener levelUpdateListener, ChunkHolder.PlayerProvider playersWatchingChunkProvider) { +- this.futures = new AtomicReferenceArray(ChunkHolder.CHUNK_STATUSES.size()); +- this.fullChunkFuture = ChunkHolder.UNLOADED_LEVEL_CHUNK_FUTURE; +- this.tickingChunkFuture = ChunkHolder.UNLOADED_LEVEL_CHUNK_FUTURE; +- this.entityTickingChunkFuture = ChunkHolder.UNLOADED_LEVEL_CHUNK_FUTURE; +- this.chunkToSave = CompletableFuture.completedFuture(null); // CraftBukkit - decompile error ++ public final io.papermc.paper.chunk.system.scheduling.NewChunkHolder newChunkHolder; // Paper - rewrite chunk system ++ ++ // Paper start - replace player chunk loader ++ private final com.destroystokyo.paper.util.maplist.ReferenceList<ServerPlayer> playersSentChunkTo = new com.destroystokyo.paper.util.maplist.ReferenceList<>(); ++ ++ public void addPlayer(ServerPlayer player) { ++ if (!this.playersSentChunkTo.add(player)) { ++ throw new IllegalStateException("Already sent chunk " + this.pos + " in world '" + this.chunkMap.level.getWorld().getName() + "' to player " + player); ++ } ++ } ++ ++ public void removePlayer(ServerPlayer player) { ++ if (!this.playersSentChunkTo.remove(player)) { ++ throw new IllegalStateException("Have not sent chunk " + this.pos + " in world '" + this.chunkMap.level.getWorld().getName() + "' to player " + player); ++ } ++ } ++ ++ public boolean hasChunkBeenSent() { ++ return this.playersSentChunkTo.size() != 0; ++ } ++ ++ public boolean hasBeenSent(ServerPlayer to) { ++ return this.playersSentChunkTo.contains(to); ++ } ++ // Paper end - replace player chunk loader ++ public ChunkHolder(ChunkPos pos, LevelHeightAccessor world, LevelLightEngine lightingProvider, ChunkHolder.PlayerProvider playersWatchingChunkProvider, io.papermc.paper.chunk.system.scheduling.NewChunkHolder newChunkHolder) { // Paper - rewrite chunk system ++ this.newChunkHolder = newChunkHolder; // Paper - rewrite chunk system + this.chunkToSaveHistory = null; + this.blockChangedLightSectionFilter = new BitSet(); + this.skyChangedLightSectionFilter = new BitSet(); +- this.pendingFullStateConfirmation = CompletableFuture.completedFuture(null); // CraftBukkit - decompile error +- this.sendSync = CompletableFuture.completedFuture(null); // CraftBukkit - decompile error ++ // Paper - rewrite chunk system + this.pos = pos; + this.levelHeightAccessor = world; + this.lightEngine = lightingProvider; +- this.onLevelChange = levelUpdateListener; ++ this.onLevelChange = null; // Paper - rewrite chunk system + this.playerProvider = playersWatchingChunkProvider; +- this.oldTicketLevel = ChunkLevel.MAX_LEVEL + 1; +- this.ticketLevel = this.oldTicketLevel; +- this.queueLevel = this.oldTicketLevel; +- this.setTicketLevel(level); ++ // Paper - rewrite chunk system + this.changedBlocksPerSection = new ShortSet[world.getSectionsCount()]; + this.chunkMap = (ChunkMap)playersWatchingChunkProvider; // Paper + } + + // Paper start + public @Nullable ChunkAccess getAvailableChunkNow() { +- // TODO can we just getStatusFuture(EMPTY)? +- for (ChunkStatus curr = ChunkStatus.FULL, next = curr.getParent(); curr != next; curr = next, next = next.getParent()) { +- CompletableFuture<ChunkResult<ChunkAccess>> future = this.getFutureIfPresentUnchecked(curr); +- ChunkResult<ChunkAccess> either = future.getNow(null); +- if (either == null || either.isSuccess()) { +- continue; +- } +- return either.orElseThrow(IllegalStateException::new); +- } +- return null; ++ return this.newChunkHolder.getCurrentChunk(); // Paper - rewrite chunk system + } + // Paper end + // CraftBukkit start + public LevelChunk getFullChunkNow() { +- // Note: We use the oldTicketLevel for isLoaded checks. +- if (!ChunkLevel.fullStatus(this.oldTicketLevel).isOrAfter(FullChunkStatus.FULL)) return null; +- return this.getFullChunkNowUnchecked(); ++ // Paper start - rewrite chunk system ++ if (!this.isFullChunkReady() || !(this.getAvailableChunkNow() instanceof LevelChunk chunk)) return null; // instanceof to avoid a race condition on off-main threads ++ return chunk; ++ // Paper end - rewrite chunk system + } + + public LevelChunk getFullChunkNowUnchecked() { +- CompletableFuture<ChunkResult<ChunkAccess>> statusFuture = this.getFutureIfPresentUnchecked(ChunkStatus.FULL); +- ChunkResult<ChunkAccess> either = statusFuture.getNow(null); +- return (either == null) ? null : (LevelChunk) either.orElse(null); ++ // Paper start - rewrite chunk system ++ return this.getAvailableChunkNow() instanceof LevelChunk chunk ? chunk : null; ++ // Paper end - rewrite chunk system + } + // CraftBukkit end + + public CompletableFuture<ChunkResult<ChunkAccess>> getFutureIfPresentUnchecked(ChunkStatus leastStatus) { +- CompletableFuture<ChunkResult<ChunkAccess>> completablefuture = (CompletableFuture) this.futures.get(leastStatus.getIndex()); +- +- return completablefuture == null ? ChunkHolder.UNLOADED_CHUNK_FUTURE : completablefuture; ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + public CompletableFuture<ChunkResult<ChunkAccess>> getFutureIfPresent(ChunkStatus leastStatus) { +- return ChunkLevel.generationStatus(this.ticketLevel).isOrAfter(leastStatus) ? this.getFutureIfPresentUnchecked(leastStatus) : ChunkHolder.UNLOADED_CHUNK_FUTURE; ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + public final CompletableFuture<ChunkResult<LevelChunk>> getTickingChunkFuture() { // Paper - final for inline +- return this.tickingChunkFuture; ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + public final CompletableFuture<ChunkResult<LevelChunk>> getEntityTickingChunkFuture() { // Paper - final for inline +- return this.entityTickingChunkFuture; ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk systemv + } + + public final CompletableFuture<ChunkResult<LevelChunk>> getFullChunkFuture() { // Paper - final for inline +- return this.fullChunkFuture; ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk systemv + } + + @Nullable + public final LevelChunk getTickingChunk() { // Paper - final for inline +- return (LevelChunk) ((ChunkResult) this.getTickingChunkFuture().getNow(ChunkHolder.UNLOADED_LEVEL_CHUNK)).orElse(null); // CraftBukkit - decompile error ++ // Paper start - rewrite chunk system ++ if (!this.isTickingReady()) { ++ return null; ++ } ++ return (LevelChunk)this.getAvailableChunkNow(); ++ // Paper end - rewrite chunk system + } + + public CompletableFuture<?> getChunkSendSyncFuture() { +- return this.sendSync; ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + @Nullable + public LevelChunk getChunkToSend() { +- return !this.sendSync.isDone() ? null : this.getTickingChunk(); ++ return this.getSendingChunk(); // Paper - rewrite chunk system + } + + @Nullable + public ChunkStatus getLastAvailableStatus() { +- for (int i = ChunkHolder.CHUNK_STATUSES.size() - 1; i >= 0; --i) { +- ChunkStatus chunkstatus = (ChunkStatus) ChunkHolder.CHUNK_STATUSES.get(i); +- CompletableFuture<ChunkResult<ChunkAccess>> completablefuture = this.getFutureIfPresentUnchecked(chunkstatus); +- +- if (((ChunkResult) completablefuture.getNow(ChunkHolder.UNLOADED_CHUNK)).isSuccess()) { +- return chunkstatus; +- } +- } +- +- return null; ++ return this.newChunkHolder.getCurrentGenStatus(); // Paper - rewrite chunk system + } + + // Paper start + public @Nullable ChunkStatus getChunkHolderStatus() { +- for (ChunkStatus curr = ChunkStatus.FULL, next = curr.getParent(); curr != next; curr = next, next = next.getParent()) { +- CompletableFuture<ChunkResult<ChunkAccess>> future = this.getFutureIfPresentUnchecked(curr); +- ChunkResult<ChunkAccess> either = future.getNow(null); +- if (either == null || !either.isSuccess()) { +- continue; +- } +- return curr; +- } +- +- return null; ++ return this.newChunkHolder.getCurrentGenStatus(); // Paper - rewrite chunk system + } + // Paper end + + @Nullable + public ChunkAccess getLastAvailable() { +- for (int i = ChunkHolder.CHUNK_STATUSES.size() - 1; i >= 0; --i) { +- ChunkStatus chunkstatus = (ChunkStatus) ChunkHolder.CHUNK_STATUSES.get(i); +- CompletableFuture<ChunkResult<ChunkAccess>> completablefuture = this.getFutureIfPresentUnchecked(chunkstatus); +- +- if (!completablefuture.isCompletedExceptionally()) { +- ChunkAccess ichunkaccess = (ChunkAccess) ((ChunkResult) completablefuture.getNow(ChunkHolder.UNLOADED_CHUNK)).orElse((Object) null); +- +- if (ichunkaccess != null) { +- return ichunkaccess; +- } +- } +- } +- +- return null; ++ return this.newChunkHolder.getCurrentChunk(); // Paper - rewrite chunk system + } + +- public final CompletableFuture<ChunkAccess> getChunkToSave() { // Paper - final for inline +- return this.chunkToSave; +- } ++ // Paper - rewrite chunk system + + public void blockChanged(BlockPos pos) { +- LevelChunk chunk = this.getTickingChunk(); ++ // Paper start - replace player chunk loader ++ if (this.playersSentChunkTo.size() == 0) { ++ return; ++ } ++ // Paper end - replace player chunk loader ++ LevelChunk chunk = this.getSendingChunk(); // Paper - no-tick view distance + + if (chunk != null) { + int i = this.levelHeightAccessor.getSectionIndex(pos.getY()); +@@ -237,13 +225,13 @@ public class ChunkHolder { + } + + public void sectionLightChanged(LightLayer lightType, int y) { +- ChunkAccess ichunkaccess = (ChunkAccess) ((ChunkResult) this.getFutureIfPresent(ChunkStatus.INITIALIZE_LIGHT).getNow(ChunkHolder.UNLOADED_CHUNK)).orElse(null); // CraftBukkit - decompile error ++ ChunkAccess ichunkaccess = this.getAvailableChunkNow(); // Paper - rewrite chunk system + + if (ichunkaccess != null) { + ichunkaccess.setUnsaved(true); +- LevelChunk chunk = this.getTickingChunk(); ++ LevelChunk chunk = this.getSendingChunk(); // Paper - rewrite chunk system + +- if (chunk != null) { ++ if (this.playersSentChunkTo.size() != 0 && chunk != null) { // Paper - replace player chunk loader + int j = this.lightEngine.getMinLightSection(); + int k = this.lightEngine.getMaxLightSection(); + +@@ -263,7 +251,7 @@ public class ChunkHolder { + + // Paper start - starlight + public void broadcast(Packet<?> packet, boolean onChunkViewEdge) { +- this.broadcast(this.playerProvider.getPlayers(this.pos, onChunkViewEdge), packet); ++ this.broadcast(this.getPlayers(onChunkViewEdge), packet); // Paper - rewrite chunk system + } + // Paper end - starlight + +@@ -273,7 +261,7 @@ public class ChunkHolder { + List list; + + if (!this.skyChangedLightSectionFilter.isEmpty() || !this.blockChangedLightSectionFilter.isEmpty()) { +- list = this.playerProvider.getPlayers(this.pos, true); ++ list = this.getPlayers(true); // Paper - rewrite chunk system + if (!list.isEmpty()) { + ClientboundLightUpdatePacket packetplayoutlightupdate = new ClientboundLightUpdatePacket(chunk.getPos(), this.lightEngine, this.skyChangedLightSectionFilter, this.blockChangedLightSectionFilter); + +@@ -285,7 +273,7 @@ public class ChunkHolder { + } + + if (this.hasChangedSections) { +- list = this.playerProvider.getPlayers(this.pos, false); ++ list = this.getPlayers(false); // Paper - rewrite chunk system + + for (int i = 0; i < this.changedBlocksPerSection.length; ++i) { + ShortSet shortset = this.changedBlocksPerSection[i]; +@@ -343,75 +331,33 @@ public class ChunkHolder { + + } + +- private void broadcast(List<ServerPlayer> players, Packet<?> packet) { +- players.forEach((entityplayer) -> { +- entityplayer.connection.send(packet); +- }); +- } +- +- public CompletableFuture<ChunkResult<ChunkAccess>> getOrScheduleFuture(ChunkStatus targetStatus, ChunkMap chunkStorage) { +- int i = targetStatus.getIndex(); +- CompletableFuture<ChunkResult<ChunkAccess>> completablefuture = (CompletableFuture) this.futures.get(i); ++ // Paper start - rewrite chunk system ++ public List<ServerPlayer> getPlayers(boolean onlyOnWatchDistanceEdge) { ++ List<ServerPlayer> ret = new java.util.ArrayList<>(); + +- if (completablefuture != null) { +- ChunkResult<ChunkAccess> chunkresult = (ChunkResult) completablefuture.getNow(ChunkHolder.NOT_DONE_YET); +- +- if (chunkresult == null) { +- String s = String.valueOf(targetStatus); +- String s1 = "value in future for status: " + s + " was incorrectly set to null at chunk: " + String.valueOf(this.pos); +- +- throw chunkStorage.debugFuturesAndCreateReportedException(new IllegalStateException("null value previously set for chunk status"), s1); +- } +- +- if (chunkresult == ChunkHolder.NOT_DONE_YET || chunkresult.isSuccess()) { +- return completablefuture; ++ for (int i = 0, len = this.playersSentChunkTo.size(); i < len; ++i) { ++ ServerPlayer player = this.playersSentChunkTo.getUnchecked(i); ++ if (onlyOnWatchDistanceEdge && !this.chunkMap.level.playerChunkLoader.isChunkSent(player, this.pos.x, this.pos.z, onlyOnWatchDistanceEdge)) { ++ continue; + } ++ ret.add(player); + } + +- if (ChunkLevel.generationStatus(this.ticketLevel).isOrAfter(targetStatus)) { +- CompletableFuture<ChunkResult<ChunkAccess>> completablefuture1 = chunkStorage.schedule(this, targetStatus); +- +- this.updateChunkToSave(completablefuture1, "schedule " + String.valueOf(targetStatus)); +- this.futures.set(i, completablefuture1); +- return completablefuture1; +- } else { +- return completablefuture == null ? ChunkHolder.UNLOADED_CHUNK_FUTURE : completablefuture; +- } ++ return ret; + } ++ // Paper end - rewrite chunk system + +- protected void addSaveDependency(String thenDesc, CompletableFuture<?> then) { +- if (this.chunkToSaveHistory != null) { +- this.chunkToSaveHistory.push(new ChunkHolder.ChunkSaveDebug(Thread.currentThread(), then, thenDesc)); +- } + +- this.chunkToSave = this.chunkToSave.thenCombine(then, (ichunkaccess, object) -> { +- return ichunkaccess; +- }); +- } +- +- private void updateChunkToSave(CompletableFuture<? extends ChunkResult<? extends ChunkAccess>> then, String thenDesc) { +- if (this.chunkToSaveHistory != null) { +- this.chunkToSaveHistory.push(new ChunkHolder.ChunkSaveDebug(Thread.currentThread(), then, thenDesc)); +- } +- +- this.chunkToSave = this.chunkToSave.thenCombine(then, (ichunkaccess, chunkresult) -> { +- return (ChunkAccess) ChunkResult.orElse(chunkresult, ichunkaccess); ++ private void broadcast(List<ServerPlayer> players, Packet<?> packet) { ++ players.forEach((entityplayer) -> { ++ entityplayer.connection.send(packet); + }); + } + +- public void addSendDependency(CompletableFuture<?> postProcessingFuture) { +- if (this.sendSync.isDone()) { +- this.sendSync = postProcessingFuture; +- } else { +- this.sendSync = this.sendSync.thenCombine(postProcessingFuture, (object, object1) -> { +- return null; +- }); +- } +- +- } ++ // Paper - rewrite chunk system + + public FullChunkStatus getFullStatus() { +- return ChunkLevel.fullStatus(this.ticketLevel); ++ return this.newChunkHolder.getChunkStatus(); // Paper - rewrite chunk system + } + + public final ChunkPos getPos() { // Paper - final for inline +@@ -419,238 +365,17 @@ public class ChunkHolder { + } + + public final int getTicketLevel() { // Paper - final for inline +- return this.ticketLevel; +- } +- +- public int getQueueLevel() { +- return this.queueLevel; +- } +- +- private void setQueueLevel(int level) { +- this.queueLevel = level; +- } +- +- public void setTicketLevel(int level) { +- this.ticketLevel = level; +- } +- +- private void scheduleFullChunkPromotion(ChunkMap playerchunkmap, CompletableFuture<ChunkResult<LevelChunk>> completablefuture, Executor executor, FullChunkStatus fullchunkstatus) { +- this.pendingFullStateConfirmation.cancel(false); +- CompletableFuture<Void> completablefuture1 = new CompletableFuture(); +- +- completablefuture1.thenRunAsync(() -> { +- playerchunkmap.onFullChunkStatusChange(this.pos, fullchunkstatus); +- }, executor); +- this.pendingFullStateConfirmation = completablefuture1; +- completablefuture.thenAccept((chunkresult) -> { +- chunkresult.ifSuccess((chunk) -> { +- completablefuture1.complete(null); // CraftBukkit - decompile error +- }); +- }); +- } +- +- private void demoteFullChunk(ChunkMap playerchunkmap, FullChunkStatus fullchunkstatus) { +- this.pendingFullStateConfirmation.cancel(false); +- playerchunkmap.onFullChunkStatusChange(this.pos, fullchunkstatus); +- } +- +- protected void updateFutures(ChunkMap chunkStorage, Executor executor) { +- ChunkStatus chunkstatus = ChunkLevel.generationStatus(this.oldTicketLevel); +- ChunkStatus chunkstatus1 = ChunkLevel.generationStatus(this.ticketLevel); +- boolean flag = ChunkLevel.isLoaded(this.oldTicketLevel); +- boolean flag1 = ChunkLevel.isLoaded(this.ticketLevel); +- FullChunkStatus fullchunkstatus = ChunkLevel.fullStatus(this.oldTicketLevel); +- FullChunkStatus fullchunkstatus1 = ChunkLevel.fullStatus(this.ticketLevel); +- // CraftBukkit start +- // ChunkUnloadEvent: Called before the chunk is unloaded: isChunkLoaded is still true and chunk can still be modified by plugins. +- if (fullchunkstatus.isOrAfter(FullChunkStatus.FULL) && !fullchunkstatus1.isOrAfter(FullChunkStatus.FULL)) { +- this.getFutureIfPresentUnchecked(ChunkStatus.FULL).thenAccept((either) -> { +- LevelChunk chunk = (LevelChunk) either.orElse(null); +- if (chunk != null) { +- chunkStorage.callbackExecutor.execute(() -> { +- // Minecraft will apply the chunks tick lists to the world once the chunk got loaded, and then store the tick +- // lists again inside the chunk once the chunk becomes inaccessible and set the chunk's needsSaving flag. +- // These actions may however happen deferred, so we manually set the needsSaving flag already here. +- chunk.setUnsaved(true); +- chunk.unloadCallback(); +- }); +- } +- }).exceptionally((throwable) -> { +- // ensure exceptions are printed, by default this is not the case +- MinecraftServer.LOGGER.error("Failed to schedule unload callback for chunk " + ChunkHolder.this.pos, throwable); +- return null; +- }); +- +- // Run callback right away if the future was already done +- chunkStorage.callbackExecutor.run(); +- } +- // CraftBukkit end +- +- if (flag) { +- ChunkResult<ChunkAccess> chunkresult = ChunkResult.error(() -> { +- return "Unloaded ticket level " + String.valueOf(this.pos); +- }); +- +- for (int i = flag1 ? chunkstatus1.getIndex() + 1 : 0; i <= chunkstatus.getIndex(); ++i) { +- CompletableFuture<ChunkResult<ChunkAccess>> completablefuture = (CompletableFuture) this.futures.get(i); +- +- if (completablefuture == null) { +- this.futures.set(i, CompletableFuture.completedFuture(chunkresult)); +- } +- } +- } +- +- boolean flag2 = fullchunkstatus.isOrAfter(FullChunkStatus.FULL); +- boolean flag3 = fullchunkstatus1.isOrAfter(FullChunkStatus.FULL); +- +- this.wasAccessibleSinceLastSave |= flag3; +- if (!flag2 && flag3) { +- int expectCreateCount = ++this.fullChunkCreateCount; // Paper +- this.fullChunkFuture = chunkStorage.prepareAccessibleChunk(this); +- this.scheduleFullChunkPromotion(chunkStorage, this.fullChunkFuture, executor, FullChunkStatus.FULL); +- // Paper start - cache ticking ready status +- this.fullChunkFuture.thenAccept(chunkResult -> { +- chunkResult.ifSuccess(chunk -> { +- if (ChunkHolder.this.fullChunkCreateCount == expectCreateCount) { +- ChunkHolder.this.isFullChunkReady = true; +- io.papermc.paper.chunk.system.ChunkSystem.onChunkBorder(chunk, this); +- } +- }); +- }); +- this.updateChunkToSave(this.fullChunkFuture, "full"); +- } +- +- if (flag2 && !flag3) { +- // Paper start +- if (this.isFullChunkReady) { +- io.papermc.paper.chunk.system.ChunkSystem.onChunkNotBorder(this.fullChunkFuture.join().orElseThrow(IllegalStateException::new), this); // Paper +- } +- // Paper end +- this.fullChunkFuture.complete(ChunkHolder.UNLOADED_LEVEL_CHUNK); +- this.fullChunkFuture = ChunkHolder.UNLOADED_LEVEL_CHUNK_FUTURE; +- ++this.fullChunkCreateCount; // Paper - cache ticking ready status +- this.isFullChunkReady = false; // Paper - cache ticking ready status +- } +- +- boolean flag4 = fullchunkstatus.isOrAfter(FullChunkStatus.BLOCK_TICKING); +- boolean flag5 = fullchunkstatus1.isOrAfter(FullChunkStatus.BLOCK_TICKING); +- +- if (!flag4 && flag5) { +- this.tickingChunkFuture = chunkStorage.prepareTickingChunk(this); +- this.scheduleFullChunkPromotion(chunkStorage, this.tickingChunkFuture, executor, FullChunkStatus.BLOCK_TICKING); +- // Paper start - cache ticking ready status +- this.tickingChunkFuture.thenAccept(chunkResult -> { +- chunkResult.ifSuccess(chunk -> { +- // note: Here is a very good place to add callbacks to logic waiting on this. +- ChunkHolder.this.isTickingReady = true; +- io.papermc.paper.chunk.system.ChunkSystem.onChunkTicking(chunk, this); +- }); +- }); +- // Paper end +- this.updateChunkToSave(this.tickingChunkFuture, "ticking"); +- } +- +- if (flag4 && !flag5) { +- // Paper start +- if (this.isTickingReady) { +- io.papermc.paper.chunk.system.ChunkSystem.onChunkNotTicking(this.tickingChunkFuture.join().orElseThrow(IllegalStateException::new), this); // Paper +- } +- // Paper end +- this.tickingChunkFuture.complete(ChunkHolder.UNLOADED_LEVEL_CHUNK); this.isTickingReady = false; // Paper - cache chunk ticking stage +- this.tickingChunkFuture = ChunkHolder.UNLOADED_LEVEL_CHUNK_FUTURE; +- } +- +- boolean flag6 = fullchunkstatus.isOrAfter(FullChunkStatus.ENTITY_TICKING); +- boolean flag7 = fullchunkstatus1.isOrAfter(FullChunkStatus.ENTITY_TICKING); +- +- if (!flag6 && flag7) { +- if (this.entityTickingChunkFuture != ChunkHolder.UNLOADED_LEVEL_CHUNK_FUTURE) { +- throw (IllegalStateException) Util.pauseInIde(new IllegalStateException()); +- } +- +- this.entityTickingChunkFuture = chunkStorage.prepareEntityTickingChunk(this); +- this.scheduleFullChunkPromotion(chunkStorage, this.entityTickingChunkFuture, executor, FullChunkStatus.ENTITY_TICKING); +- // Paper start - cache ticking ready status +- this.entityTickingChunkFuture.thenAccept(chunkResult -> { +- chunkResult.ifSuccess(chunk -> { +- ChunkHolder.this.isEntityTickingReady = true; +- io.papermc.paper.chunk.system.ChunkSystem.onChunkEntityTicking(chunk, this); +- }); +- }); +- // Paper end +- this.updateChunkToSave(this.entityTickingChunkFuture, "entity ticking"); +- } +- +- if (flag6 && !flag7) { +- // Paper start +- if (this.isEntityTickingReady) { +- io.papermc.paper.chunk.system.ChunkSystem.onChunkNotEntityTicking(this.entityTickingChunkFuture.join().orElseThrow(IllegalStateException::new), this); +- } +- // Paper end +- this.entityTickingChunkFuture.complete(ChunkHolder.UNLOADED_LEVEL_CHUNK); this.isEntityTickingReady = false; // Paper - cache chunk ticking stage +- this.entityTickingChunkFuture = ChunkHolder.UNLOADED_LEVEL_CHUNK_FUTURE; +- } +- +- if (!fullchunkstatus1.isOrAfter(fullchunkstatus)) { +- this.demoteFullChunk(chunkStorage, fullchunkstatus1); +- } +- +- this.onLevelChange.onLevelChange(this.pos, this::getQueueLevel, this.ticketLevel, this::setQueueLevel); +- this.oldTicketLevel = this.ticketLevel; +- // CraftBukkit start +- // ChunkLoadEvent: Called after the chunk is loaded: isChunkLoaded returns true and chunk is ready to be modified by plugins. +- if (!fullchunkstatus.isOrAfter(FullChunkStatus.FULL) && fullchunkstatus1.isOrAfter(FullChunkStatus.FULL)) { +- this.getFutureIfPresentUnchecked(ChunkStatus.FULL).thenAccept((either) -> { +- LevelChunk chunk = (LevelChunk) either.orElse(null); +- if (chunk != null) { +- chunkStorage.callbackExecutor.execute(() -> { +- chunk.loadCallback(); +- }); +- } +- }).exceptionally((throwable) -> { +- // ensure exceptions are printed, by default this is not the case +- MinecraftServer.LOGGER.error("Failed to schedule load callback for chunk " + ChunkHolder.this.pos, throwable); +- return null; +- }); +- +- // Run callback right away if the future was already done +- chunkStorage.callbackExecutor.run(); +- } +- // CraftBukkit end +- } +- +- public boolean wasAccessibleSinceLastSave() { +- return this.wasAccessibleSinceLastSave; ++ return this.newChunkHolder.getTicketLevel(); // Paper - rewrite chunk system + } + +- public void refreshAccessibility() { +- this.wasAccessibleSinceLastSave = ChunkLevel.fullStatus(this.ticketLevel).isOrAfter(FullChunkStatus.FULL); +- } ++ // Paper - rewrite chunk system + + public void replaceProtoChunk(ImposterProtoChunk chunk) { +- for (int i = 0; i < this.futures.length(); ++i) { +- CompletableFuture<ChunkResult<ChunkAccess>> completablefuture = (CompletableFuture) this.futures.get(i); +- +- if (completablefuture != null) { +- ChunkAccess ichunkaccess = (ChunkAccess) ((ChunkResult) completablefuture.getNow(ChunkHolder.UNLOADED_CHUNK)).orElse((Object) null); +- +- if (ichunkaccess instanceof ProtoChunk) { +- this.futures.set(i, CompletableFuture.completedFuture(ChunkResult.of(chunk))); +- } +- } +- } +- +- this.updateChunkToSave(CompletableFuture.completedFuture(ChunkResult.of(chunk.getWrapped())), "replaceProto"); ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + public List<Pair<ChunkStatus, CompletableFuture<ChunkResult<ChunkAccess>>>> getAllFutures() { +- List<Pair<ChunkStatus, CompletableFuture<ChunkResult<ChunkAccess>>>> list = new ArrayList(); +- +- for (int i = 0; i < ChunkHolder.CHUNK_STATUSES.size(); ++i) { +- list.add(Pair.of((ChunkStatus) ChunkHolder.CHUNK_STATUSES.get(i), (CompletableFuture) this.futures.get(i))); +- } +- +- return list; ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + @FunctionalInterface +@@ -670,15 +395,15 @@ public class ChunkHolder { + + // Paper start + public final boolean isEntityTickingReady() { +- return this.isEntityTickingReady; ++ return this.newChunkHolder.isEntityTickingReady(); // Paper - rewrite chunk system + } + + public final boolean isTickingReady() { +- return this.isTickingReady; ++ return this.newChunkHolder.isTickingReady(); // Paper - rewrite chunk system + } + + public final boolean isFullChunkReady() { +- return this.isFullChunkReady; ++ return this.newChunkHolder.isFullChunkReady(); // Paper - rewrite chunk system + } + // Paper end + } +diff --git a/src/main/java/net/minecraft/server/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java +index d3f63185edd1db9fab3887ea3f08982435b3a23c..721b63f7471ace33ae22f4205f554ee3be0e033d 100644 +--- a/src/main/java/net/minecraft/server/level/ChunkMap.java ++++ b/src/main/java/net/minecraft/server/level/ChunkMap.java +@@ -122,10 +122,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider + public static final int MIN_VIEW_DISTANCE = 2; + public static final int MAX_VIEW_DISTANCE = 32; + public static final int FORCED_TICKET_LEVEL = ChunkLevel.byStatus(FullChunkStatus.ENTITY_TICKING); +- public final Long2ObjectLinkedOpenHashMap<ChunkHolder> updatingChunkMap = new Long2ObjectLinkedOpenHashMap(); +- public volatile Long2ObjectLinkedOpenHashMap<ChunkHolder> visibleChunkMap; +- private final Long2ObjectLinkedOpenHashMap<ChunkHolder> pendingUnloads; +- private final LongSet entitiesInLevel; ++ // Paper - rewrite chunk system + public final ServerLevel level; + private final ThreadedLevelLightEngine lightEngine; + public final BlockableEventLoop<Runnable> mainThreadExecutor; // Paper - public +@@ -134,11 +131,9 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider + private final ChunkGeneratorStructureState chunkGeneratorState; + public final Supplier<DimensionDataStorage> overworldDataStorage; + private final PoiManager poiManager; +- public final LongSet toDrop; ++ // Paper - rewrite chunk system + private boolean modified; +- private final ChunkTaskPriorityQueueSorter queueSorter; +- private final ProcessorHandle<ChunkTaskPriorityQueueSorter.Message<Runnable>> worldgenMailbox; +- private final ProcessorHandle<ChunkTaskPriorityQueueSorter.Message<Runnable>> mainThreadMailbox; ++ // Paper - rewrite chunk system + public final ChunkProgressListener progressListener; + private final ChunkStatusUpdateListener chunkStatusListener; + public final ChunkMap.ChunkDistanceManager distanceManager; +@@ -150,28 +145,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider + private final Long2LongMap chunkSaveCooldowns; + private final Queue<Runnable> unloadQueue; + public int serverViewDistance; +- private WorldGenContext worldGenContext; +- +- // CraftBukkit start - recursion-safe executor for Chunk loadCallback() and unloadCallback() +- public final CallbackExecutor callbackExecutor = new CallbackExecutor(); +- public static final class CallbackExecutor implements java.util.concurrent.Executor, Runnable { +- +- private final java.util.Queue<Runnable> queue = new java.util.ArrayDeque<>(); +- +- @Override +- public void execute(Runnable runnable) { +- this.queue.add(runnable); +- } +- +- @Override +- public void run() { +- Runnable task; +- while ((task = this.queue.poll()) != null) { +- task.run(); +- } +- } +- }; +- // CraftBukkit end ++ private WorldGenContext worldGenContext; public final WorldGenContext getWorldGenContext() { return this.worldGenContext; } // Paper - rewrite chunk system + + // Paper start - distance maps + private final com.destroystokyo.paper.util.misc.PooledLinkedHashSets<ServerPlayer> pooledLinkedPlayerHashSets = new com.destroystokyo.paper.util.misc.PooledLinkedHashSets<>(); +@@ -181,6 +155,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider + int chunkZ = io.papermc.paper.util.MCUtil.getChunkCoordinate(player.getZ()); + // Note: players need to be explicitly added to distance maps before they can be updated + this.nearbyPlayers.addPlayer(player); ++ this.level.playerChunkLoader.addPlayer(player); // Paper - replace chunk loader + } + + void removePlayerFromDistanceMaps(ServerPlayer player) { +@@ -188,6 +163,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider + int chunkZ = io.papermc.paper.util.MCUtil.getChunkCoordinate(player.getZ()); + // Note: players need to be explicitly added to distance maps before they can be updated + this.nearbyPlayers.removePlayer(player); ++ this.level.playerChunkLoader.removePlayer(player); // Paper - replace chunk loader + } + + void updateMaps(ServerPlayer player) { +@@ -195,6 +171,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider + int chunkZ = io.papermc.paper.util.MCUtil.getChunkCoordinate(player.getZ()); + // Note: players need to be explicitly added to distance maps before they can be updated + this.nearbyPlayers.tickPlayer(player); ++ this.level.playerChunkLoader.updatePlayer(player); // Paper - replace chunk loader + } + // Paper end + // Paper start +@@ -224,17 +201,14 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider + } + + public final ChunkHolder getUnloadingChunkHolder(int chunkX, int chunkZ) { +- return this.pendingUnloads.get(io.papermc.paper.util.CoordinateUtils.getChunkKey(chunkX, chunkZ)); ++ return null; // Paper - rewrite chunk system + } + public final io.papermc.paper.util.player.NearbyPlayers nearbyPlayers; + // Paper end + + public ChunkMap(ServerLevel world, LevelStorageSource.LevelStorageAccess session, DataFixer dataFixer, StructureTemplateManager structureTemplateManager, Executor executor, BlockableEventLoop<Runnable> mainThreadExecutor, LightChunkGetter chunkProvider, ChunkGenerator chunkGenerator, ChunkProgressListener worldGenerationProgressListener, ChunkStatusUpdateListener chunkStatusChangeListener, Supplier<DimensionDataStorage> persistentStateManagerFactory, int viewDistance, boolean dsync) { + super(new RegionStorageInfo(session.getLevelId(), world.dimension(), "chunk"), session.getDimensionPath(world.dimension()).resolve("region"), dataFixer, dsync); +- this.visibleChunkMap = this.updatingChunkMap.clone(); +- this.pendingUnloads = new Long2ObjectLinkedOpenHashMap(); +- this.entitiesInLevel = new LongOpenHashSet(); +- this.toDrop = new LongOpenHashSet(); ++ // Paper - rewrite chunk system + this.tickingGenerated = new AtomicInteger(); + this.playerMap = new PlayerMap(); + this.entityMap = new Int2ObjectOpenHashMap(); +@@ -263,19 +237,17 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider + + this.chunkGeneratorState = chunkGenerator.createState(iregistrycustom.lookupOrThrow(Registries.STRUCTURE_SET), this.randomState, j, world.spigotConfig); // Spigot + this.mainThreadExecutor = mainThreadExecutor; +- ProcessorMailbox<Runnable> threadedmailbox = ProcessorMailbox.create(executor, "worldgen"); ++ // Paper - rewrite chunk system + + Objects.requireNonNull(mainThreadExecutor); +- ProcessorHandle<Runnable> mailbox = ProcessorHandle.of("main", mainThreadExecutor::tell); ++ // Paper - rewrite chunk system + + this.progressListener = worldGenerationProgressListener; + this.chunkStatusListener = chunkStatusChangeListener; +- ProcessorMailbox<Runnable> threadedmailbox1 = ProcessorMailbox.create(executor, "light"); ++ // Paper - rewrite chunk system + +- this.queueSorter = new ChunkTaskPriorityQueueSorter(ImmutableList.of(threadedmailbox, mailbox, threadedmailbox1), executor, Integer.MAX_VALUE); +- this.worldgenMailbox = this.queueSorter.getProcessor(threadedmailbox, false); +- this.mainThreadMailbox = this.queueSorter.getProcessor(mailbox, false); +- this.lightEngine = new ThreadedLevelLightEngine(chunkProvider, this, this.level.dimensionType().hasSkyLight(), threadedmailbox1, this.queueSorter.getProcessor(threadedmailbox1, false)); ++ // Paper - rewrite chunk system ++ this.lightEngine = new ThreadedLevelLightEngine(chunkProvider, this, this.level.dimensionType().hasSkyLight(), null, null); // Paper - rewrite chunk system + this.distanceManager = new ChunkMap.ChunkDistanceManager(executor, mainThreadExecutor); + this.overworldDataStorage = persistentStateManagerFactory; + this.poiManager = new PoiManager(new RegionStorageInfo(session.getLevelId(), world.dimension(), "poi"), path.resolve("poi"), dataFixer, dsync, iregistrycustom, world); +@@ -333,23 +305,15 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider + } + + boolean isChunkTracked(ServerPlayer player, int chunkX, int chunkZ) { +- return player.getChunkTrackingView().contains(chunkX, chunkZ) && !player.connection.chunkSender.isPending(ChunkPos.asLong(chunkX, chunkZ)); ++ // Paper start - rewrite player chunk loader ++ return this.level.playerChunkLoader.isChunkSent(player, chunkX, chunkZ); ++ // Paper end - rewrite player chunk loader + } + + private boolean isChunkOnTrackedBorder(ServerPlayer player, int chunkX, int chunkZ) { +- if (!this.isChunkTracked(player, chunkX, chunkZ)) { +- return false; +- } else { +- for (int k = -1; k <= 1; ++k) { +- for (int l = -1; l <= 1; ++l) { +- if ((k != 0 || l != 0) && !this.isChunkTracked(player, chunkX + k, chunkZ + l)) { +- return true; +- } +- } +- } +- +- return false; +- } ++ // Paper start - rewrite player chunk loader ++ return this.level.playerChunkLoader.isChunkSent(player, chunkX, chunkZ, true); ++ // Paper end - rewrite player chunk loader + } + + protected ThreadedLevelLightEngine getLightEngine() { +@@ -358,20 +322,22 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider + + @Nullable + protected ChunkHolder getUpdatingChunkIfPresent(long pos) { +- return (ChunkHolder) this.updatingChunkMap.get(pos); ++ // Paper start - rewrite chunk system ++ io.papermc.paper.chunk.system.scheduling.NewChunkHolder holder = this.level.chunkTaskScheduler.chunkHolderManager.getChunkHolder(pos); ++ return holder == null ? null : holder.vanillaChunkHolder; ++ // Paper end - rewrite chunk system + } + + @Nullable + public ChunkHolder getVisibleChunkIfPresent(long pos) { +- return (ChunkHolder) this.visibleChunkMap.get(pos); ++ // Paper start - rewrite chunk system ++ io.papermc.paper.chunk.system.scheduling.NewChunkHolder holder = this.level.chunkTaskScheduler.chunkHolderManager.getChunkHolder(pos); ++ return holder == null ? null : holder.vanillaChunkHolder; ++ // Paper end - rewrite chunk system + } + + protected IntSupplier getChunkQueueLevel(long pos) { +- return () -> { +- ChunkHolder playerchunk = this.getVisibleChunkIfPresent(pos); +- +- return playerchunk == null ? ChunkTaskPriorityQueue.PRIORITY_LEVEL_COUNT - 1 : Math.min(playerchunk.getQueueLevel(), ChunkTaskPriorityQueue.PRIORITY_LEVEL_COUNT - 1); +- }; ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + public String getChunkDebugData(ChunkPos chunkPos) { +@@ -400,80 +366,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider + } + + private CompletableFuture<ChunkResult<List<ChunkAccess>>> getChunkRangeFuture(ChunkHolder centerChunk, int margin, IntFunction<ChunkStatus> distanceToStatus) { +- if (margin == 0) { +- ChunkStatus chunkstatus = (ChunkStatus) distanceToStatus.apply(0); +- +- return centerChunk.getOrScheduleFuture(chunkstatus, this).thenApply((chunkresult) -> { +- return chunkresult.map(List::of); +- }); +- } else { +- List<CompletableFuture<ChunkResult<ChunkAccess>>> list = new ArrayList(); +- List<ChunkHolder> list1 = new ArrayList(); +- ChunkPos chunkcoordintpair = centerChunk.getPos(); +- int j = chunkcoordintpair.x; +- int k = chunkcoordintpair.z; +- +- for (int l = -margin; l <= margin; ++l) { +- for (int i1 = -margin; i1 <= margin; ++i1) { +- int j1 = Math.max(Math.abs(i1), Math.abs(l)); +- ChunkPos chunkcoordintpair1 = new ChunkPos(j + i1, k + l); +- long k1 = chunkcoordintpair1.toLong(); +- ChunkHolder playerchunk1 = this.getUpdatingChunkIfPresent(k1); +- +- if (playerchunk1 == null) { +- return CompletableFuture.completedFuture(ChunkResult.error(() -> { +- return "Unloaded " + String.valueOf(chunkcoordintpair1); +- })); +- } +- +- ChunkStatus chunkstatus1 = (ChunkStatus) distanceToStatus.apply(j1); +- CompletableFuture<ChunkResult<ChunkAccess>> completablefuture = playerchunk1.getOrScheduleFuture(chunkstatus1, this); +- +- list1.add(playerchunk1); +- list.add(completablefuture); +- } +- } +- +- CompletableFuture<List<ChunkResult<ChunkAccess>>> completablefuture1 = Util.sequence(list); +- CompletableFuture<ChunkResult<List<ChunkAccess>>> completablefuture2 = completablefuture1.thenApply((list2) -> { +- List<ChunkAccess> list3 = Lists.newArrayList(); +- // CraftBukkit start - decompile error +- int cnt = 0; +- +- for (Iterator iterator = list2.iterator(); iterator.hasNext(); ++cnt) { +- final int l1 = cnt; +- // CraftBukkit end +- ChunkResult<ChunkAccess> chunkresult = (ChunkResult) iterator.next(); +- +- if (chunkresult == null) { +- throw this.debugFuturesAndCreateReportedException(new IllegalStateException("At least one of the chunk futures were null"), "n/a"); +- } +- +- ChunkAccess ichunkaccess = (ChunkAccess) chunkresult.orElse(null); // CraftBukkit - decompile error +- +- if (ichunkaccess == null) { +- return ChunkResult.error(() -> { +- String s = String.valueOf(new ChunkPos(j + l1 % (margin * 2 + 1), k + l1 / (margin * 2 + 1))); +- +- return "Unloaded " + s + " " + chunkresult.getError(); +- }); +- } +- +- list3.add(ichunkaccess); +- } +- +- return ChunkResult.of(list3); +- }); +- Iterator iterator = list1.iterator(); +- +- while (iterator.hasNext()) { +- ChunkHolder playerchunk2 = (ChunkHolder) iterator.next(); +- +- playerchunk2.addSaveDependency("getChunkRangeFuture " + String.valueOf(chunkcoordintpair) + " " + margin, completablefuture2); +- } +- +- return completablefuture2; +- } ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + public ReportedException debugFuturesAndCreateReportedException(IllegalStateException exception, String details) { +@@ -503,263 +396,72 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider + } + + public CompletableFuture<ChunkResult<LevelChunk>> prepareEntityTickingChunk(ChunkHolder chunk) { +- return this.getChunkRangeFuture(chunk, 2, (i) -> { +- return ChunkStatus.FULL; +- }).thenApplyAsync((chunkresult) -> { +- return chunkresult.map((list) -> { +- return (LevelChunk) list.get(list.size() / 2); +- }); +- }, this.mainThreadExecutor); ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + @Nullable + ChunkHolder updateChunkScheduling(long pos, int level, @Nullable ChunkHolder holder, int k) { +- if (!ChunkLevel.isLoaded(k) && !ChunkLevel.isLoaded(level)) { +- return holder; +- } else { +- if (holder != null) { +- holder.setTicketLevel(level); +- } +- +- if (holder != null) { +- if (!ChunkLevel.isLoaded(level)) { +- this.toDrop.add(pos); +- } else { +- this.toDrop.remove(pos); +- } +- } +- +- if (ChunkLevel.isLoaded(level) && holder == null) { +- holder = (ChunkHolder) this.pendingUnloads.remove(pos); +- if (holder != null) { +- holder.setTicketLevel(level); +- } else { +- holder = new ChunkHolder(new ChunkPos(pos), level, this.level, this.lightEngine, this.queueSorter, this); +- // Paper start +- io.papermc.paper.chunk.system.ChunkSystem.onChunkHolderCreate(this.level, holder); +- // Paper end +- } +- +- // Paper start +- holder.onChunkAdd(); +- // Paper end +- this.updatingChunkMap.put(pos, holder); +- this.modified = true; +- } +- +- return holder; +- } ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + @Override + public void close() throws IOException { +- try { +- this.queueSorter.close(); +- this.poiManager.close(); +- } finally { +- super.close(); +- } ++ throw new UnsupportedOperationException("Use ServerChunkCache#close"); // Paper - rewrite chunk system ++ } + ++ // Paper start - rewrite chunk system ++ protected void saveIncrementally() { ++ this.level.chunkTaskScheduler.chunkHolderManager.autoSave(); // Paper - rewrite chunk system + } ++ // Paper end - - rewrite chunk system + + protected void saveAllChunks(boolean flush) { +- if (flush) { +- List<ChunkHolder> list = io.papermc.paper.chunk.system.ChunkSystem.getVisibleChunkHolders(this.level).stream().filter(ChunkHolder::wasAccessibleSinceLastSave).peek(ChunkHolder::refreshAccessibility).toList(); // Paper +- MutableBoolean mutableboolean = new MutableBoolean(); +- +- do { +- mutableboolean.setFalse(); +- list.stream().map((playerchunk) -> { +- CompletableFuture completablefuture; +- +- do { +- completablefuture = playerchunk.getChunkToSave(); +- BlockableEventLoop iasynctaskhandler = this.mainThreadExecutor; +- +- Objects.requireNonNull(completablefuture); +- iasynctaskhandler.managedBlock(completablefuture::isDone); +- } while (completablefuture != playerchunk.getChunkToSave()); +- +- return (ChunkAccess) completablefuture.join(); +- }).filter((ichunkaccess) -> { +- return ichunkaccess instanceof ImposterProtoChunk || ichunkaccess instanceof LevelChunk; +- }).filter(this::save).forEach((ichunkaccess) -> { +- mutableboolean.setTrue(); +- }); +- } while (mutableboolean.isTrue()); +- +- this.processUnloads(() -> { +- return true; +- }); +- this.flushWorker(); +- } else { +- io.papermc.paper.chunk.system.ChunkSystem.getVisibleChunkHolders(this.level).forEach(this::saveChunkIfNeeded); +- } +- ++ this.level.chunkTaskScheduler.chunkHolderManager.saveAllChunks(flush, false, false); // Paper - rewrite chunk system + } + + protected void tick(BooleanSupplier shouldKeepTicking) { + ProfilerFiller gameprofilerfiller = this.level.getProfiler(); + ++ try (Timing ignored = this.level.timings.poiUnload.startTiming()) { // Paper + gameprofilerfiller.push("poi"); + this.poiManager.tick(shouldKeepTicking); ++ } // Paper + gameprofilerfiller.popPush("chunk_unload"); + if (!this.level.noSave()) { ++ try (Timing ignored = this.level.timings.chunkUnload.startTiming()) { // Paper + this.processUnloads(shouldKeepTicking); ++ } // Paper + } + + gameprofilerfiller.pop(); + } + + public boolean hasWork() { +- return this.lightEngine.hasLightWork() || !this.pendingUnloads.isEmpty() || io.papermc.paper.chunk.system.ChunkSystem.hasAnyChunkHolders(this.level) || this.poiManager.hasWork() || !this.toDrop.isEmpty() || !this.unloadQueue.isEmpty() || this.queueSorter.hasWork() || this.distanceManager.hasTickets(); // Paper ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + private void processUnloads(BooleanSupplier shouldKeepTicking) { +- LongIterator longiterator = this.toDrop.iterator(); +- +- for (int i = 0; longiterator.hasNext() && (shouldKeepTicking.getAsBoolean() || i < 200 || this.toDrop.size() > 2000); longiterator.remove()) { +- long j = longiterator.nextLong(); +- ChunkHolder playerchunk = (ChunkHolder) this.updatingChunkMap.remove(j); +- +- if (playerchunk != null) { +- playerchunk.onChunkRemove(); // Paper +- this.pendingUnloads.put(j, playerchunk); +- this.modified = true; +- ++i; +- this.scheduleUnload(j, playerchunk); +- } +- } +- +- int k = Math.max(0, this.unloadQueue.size() - 2000); +- +- Runnable runnable; +- +- while ((shouldKeepTicking.getAsBoolean() || k > 0) && (runnable = (Runnable) this.unloadQueue.poll()) != null) { +- --k; +- runnable.run(); +- } +- +- int l = 0; +- Iterator<ChunkHolder> objectiterator = io.papermc.paper.chunk.system.ChunkSystem.getVisibleChunkHolders(this.level).iterator(); // Paper +- +- while (l < 20 && shouldKeepTicking.getAsBoolean() && objectiterator.hasNext()) { +- if (this.saveChunkIfNeeded((ChunkHolder) objectiterator.next())) { +- ++l; +- } +- } ++ this.level.chunkTaskScheduler.chunkHolderManager.processUnloads(); // Paper - rewrite chunk system + + } + + private void scheduleUnload(long pos, ChunkHolder holder) { +- CompletableFuture<ChunkAccess> completablefuture = holder.getChunkToSave(); +- Consumer<ChunkAccess> consumer = (ichunkaccess) -> { // CraftBukkit - decompile error +- CompletableFuture<ChunkAccess> completablefuture1 = holder.getChunkToSave(); +- +- if (completablefuture1 != completablefuture) { +- this.scheduleUnload(pos, holder); +- } else { +- // Paper start +- boolean removed; +- if ((removed = this.pendingUnloads.remove(pos, holder)) && ichunkaccess != null) { +- io.papermc.paper.chunk.system.ChunkSystem.onChunkHolderDelete(this.level, holder); +- // Paper end +- if (ichunkaccess instanceof LevelChunk) { +- ((LevelChunk) ichunkaccess).setLoaded(false); +- } +- +- this.save(ichunkaccess); +- if (this.entitiesInLevel.remove(pos) && ichunkaccess instanceof LevelChunk) { +- LevelChunk chunk = (LevelChunk) ichunkaccess; +- +- this.level.unload(chunk); +- } +- +- this.lightEngine.updateChunkStatus(ichunkaccess.getPos()); +- this.lightEngine.tryScheduleUpdate(); +- this.progressListener.onStatusChange(ichunkaccess.getPos(), (ChunkStatus) null); +- this.chunkSaveCooldowns.remove(ichunkaccess.getPos().toLong()); +- } else if (removed) { // Paper start +- io.papermc.paper.chunk.system.ChunkSystem.onChunkHolderDelete(this.level, holder); +- } // Paper end +- +- } +- }; +- Queue queue = this.unloadQueue; +- +- Objects.requireNonNull(this.unloadQueue); +- completablefuture.thenAcceptAsync(consumer, queue::add).whenComplete((ovoid, throwable) -> { +- if (throwable != null) { +- ChunkMap.LOGGER.error("Failed to save chunk {}", holder.getPos(), throwable); +- } +- +- }); ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + protected boolean promoteChunkMap() { +- if (!this.modified) { +- return false; +- } else { +- this.visibleChunkMap = this.updatingChunkMap.clone(); +- this.modified = false; +- return true; +- } ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + public CompletableFuture<ChunkResult<ChunkAccess>> schedule(ChunkHolder holder, ChunkStatus requiredStatus) { +- ChunkPos chunkcoordintpair = holder.getPos(); +- +- if (requiredStatus == ChunkStatus.EMPTY) { +- return this.scheduleChunkLoad(chunkcoordintpair).thenApply(ChunkResult::of); +- } else { +- if (requiredStatus == ChunkStatus.LIGHT) { +- this.distanceManager.addTicket(TicketType.LIGHT, chunkcoordintpair, ChunkLevel.byStatus(ChunkStatus.LIGHT), chunkcoordintpair); +- } +- +- if (!requiredStatus.hasLoadDependencies()) { +- ChunkAccess ichunkaccess = (ChunkAccess) ((ChunkResult) holder.getOrScheduleFuture(requiredStatus.getParent(), this).getNow(ChunkHolder.UNLOADED_CHUNK)).orElse((Object) null); +- +- if (ichunkaccess != null && ichunkaccess.getStatus().isOrAfter(requiredStatus)) { +- CompletableFuture<ChunkAccess> completablefuture = requiredStatus.load(this.worldGenContext, (ichunkaccess1) -> { +- return this.protoChunkToFullChunk(holder, ichunkaccess1); +- }, ichunkaccess); +- +- this.progressListener.onStatusChange(chunkcoordintpair, requiredStatus); +- return completablefuture.thenApply(ChunkResult::of); +- } +- } +- +- return this.scheduleChunkGeneration(holder, requiredStatus); +- } ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + private CompletableFuture<ChunkAccess> scheduleChunkLoad(ChunkPos pos) { +- return this.readChunk(pos).thenApply((optional) -> { +- return optional.filter((nbttagcompound) -> { +- boolean flag = ChunkMap.isChunkDataValid(nbttagcompound); +- +- if (!flag) { +- ChunkMap.LOGGER.error("Chunk file at {} is missing level data, skipping", pos); +- } +- +- return flag; +- }); +- }).thenApplyAsync((optional) -> { +- this.level.getProfiler().incrementCounter("chunkLoad"); +- if (optional.isPresent()) { +- ProtoChunk protochunk = ChunkSerializer.read(this.level, this.poiManager, pos, (CompoundTag) optional.get()); +- +- this.markPosition(pos, protochunk.getStatus().getChunkType()); +- return protochunk; +- } else { +- return this.createEmptyChunk(pos); +- } +- }, this.mainThreadExecutor).exceptionallyAsync((throwable) -> { +- return this.handleChunkLoadFailure(throwable, pos); +- }, this.mainThreadExecutor); ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + +- private static boolean isChunkDataValid(CompoundTag nbt) { ++ public static boolean isChunkDataValid(CompoundTag nbt) { // Paper - async chunk loading + return nbt.contains("Status", 8); + } + +@@ -816,60 +518,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider + } + + private CompletableFuture<ChunkResult<ChunkAccess>> scheduleChunkGeneration(ChunkHolder holder, ChunkStatus requiredStatus) { +- ChunkPos chunkcoordintpair = holder.getPos(); +- CompletableFuture<ChunkResult<List<ChunkAccess>>> completablefuture = this.getChunkRangeFuture(holder, requiredStatus.getRange(), (i) -> { +- return this.getDependencyStatus(requiredStatus, i); +- }); +- +- this.level.getProfiler().incrementCounter(() -> { +- return "chunkGenerate " + String.valueOf(requiredStatus); +- }); +- Executor executor = (runnable) -> { +- this.worldgenMailbox.tell(ChunkTaskPriorityQueueSorter.message(holder, runnable)); +- }; +- +- return completablefuture.thenComposeAsync((chunkresult) -> { +- List<ChunkAccess> list = (List) chunkresult.orElse(null); // CraftBukkit - decompile error +- +- if (list == null) { +- this.releaseLightTicket(chunkcoordintpair); +- Objects.requireNonNull(chunkresult); +- return CompletableFuture.completedFuture(ChunkResult.error(chunkresult::getError)); +- } else { +- try { +- ChunkAccess ichunkaccess = (ChunkAccess) list.get(list.size() / 2); +- CompletableFuture completablefuture1; +- +- if (ichunkaccess.getStatus().isOrAfter(requiredStatus)) { +- completablefuture1 = requiredStatus.load(this.worldGenContext, (ichunkaccess1) -> { +- return this.protoChunkToFullChunk(holder, ichunkaccess1); +- }, ichunkaccess); +- } else { +- completablefuture1 = requiredStatus.generate(this.worldGenContext, executor, (ichunkaccess1) -> { +- return this.protoChunkToFullChunk(holder, ichunkaccess1); +- }, list); +- } +- +- this.progressListener.onStatusChange(chunkcoordintpair, requiredStatus); +- return completablefuture1.thenApply(ChunkResult::of); +- } catch (Exception exception) { +- exception.getStackTrace(); +- CrashReport crashreport = CrashReport.forThrowable(exception, "Exception generating new chunk"); +- CrashReportCategory crashreportsystemdetails = crashreport.addCategory("Chunk to be generated"); +- +- crashreportsystemdetails.setDetail("Status being generated", () -> { +- return BuiltInRegistries.CHUNK_STATUS.getKey(requiredStatus).toString(); +- }); +- crashreportsystemdetails.setDetail("Location", (Object) String.format(Locale.ROOT, "%d,%d", chunkcoordintpair.x, chunkcoordintpair.z)); +- crashreportsystemdetails.setDetail("Position hash", (Object) ChunkPos.asLong(chunkcoordintpair.x, chunkcoordintpair.z)); +- crashreportsystemdetails.setDetail("Generator", (Object) this.generator); +- this.mainThreadExecutor.execute(() -> { +- throw new ReportedException(crashreport); +- }); +- throw new ReportedException(crashreport); +- } +- } +- }, executor); ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + protected void releaseLightTicket(ChunkPos pos) { +@@ -880,7 +529,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider + })); + } + +- private ChunkStatus getDependencyStatus(ChunkStatus centerChunkTargetStatus, int distance) { ++ public static ChunkStatus getDependencyStatus(ChunkStatus centerChunkTargetStatus, int distance) { // Paper -> public, static + ChunkStatus chunkstatus1; + + if (distance == 0) { +@@ -892,7 +541,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider + return chunkstatus1; + } + +- private static void postLoadProtoChunk(ServerLevel world, List<CompoundTag> nbt) { ++ public static void postLoadProtoChunk(ServerLevel world, List<CompoundTag> nbt, ChunkPos position) { // Paper - public and add chunk position parameter + if (!nbt.isEmpty()) { + // CraftBukkit start - these are spawned serialized (DefinedStructure) and we don't call an add event below at the moment due to ordering complexities + world.addWorldGenChunkEntities(EntityType.loadEntitiesRecursive(nbt, world).filter((entity) -> { +@@ -908,45 +557,14 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider + } + checkDupeUUID(world, entity); // Paper - duplicate uuid resolving + return !needsRemoval; +- })); ++ }), position); // Paper - rewrite chunk system + // CraftBukkit end + } + + } + + private CompletableFuture<ChunkAccess> protoChunkToFullChunk(ChunkHolder playerchunk, ChunkAccess ichunkaccess) { +- return CompletableFuture.supplyAsync(() -> { +- ChunkPos chunkcoordintpair = playerchunk.getPos(); +- ProtoChunk protochunk = (ProtoChunk) ichunkaccess; +- LevelChunk chunk; +- +- if (protochunk instanceof ImposterProtoChunk) { +- chunk = ((ImposterProtoChunk) protochunk).getWrapped(); +- } else { +- chunk = new LevelChunk(this.level, protochunk, (chunk1) -> { +- ChunkMap.postLoadProtoChunk(this.level, protochunk.getEntities()); +- }); +- playerchunk.replaceProtoChunk(new ImposterProtoChunk(chunk, false)); +- } +- +- chunk.setFullStatus(() -> { +- return ChunkLevel.fullStatus(playerchunk.getTicketLevel()); +- }); +- chunk.runPostLoad(); +- if (this.entitiesInLevel.add(chunkcoordintpair.toLong())) { +- chunk.setLoaded(true); +- chunk.registerAllBlockEntitiesAfterLevelLoad(); +- chunk.registerTickContainerInLevel(this.level); +- } +- +- return chunk; +- }, (runnable) -> { +- ProcessorHandle mailbox = this.mainThreadMailbox; +- long i = playerchunk.getPos().toLong(); +- +- Objects.requireNonNull(playerchunk); +- mailbox.tell(ChunkTaskPriorityQueueSorter.message(runnable, i, playerchunk::getTicketLevel)); +- }); ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + // Paper start - duplicate uuid resolving +@@ -990,61 +608,16 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider + // Paper end - duplicate uuid resolving + + public CompletableFuture<ChunkResult<LevelChunk>> prepareTickingChunk(ChunkHolder holder) { +- CompletableFuture<ChunkResult<List<ChunkAccess>>> completablefuture = this.getChunkRangeFuture(holder, 1, (i) -> { +- return ChunkStatus.FULL; +- }); +- CompletableFuture<ChunkResult<LevelChunk>> completablefuture1 = completablefuture.thenApplyAsync((chunkresult) -> { +- return chunkresult.map((list) -> { +- return (LevelChunk) list.get(list.size() / 2); +- }); +- }, (runnable) -> { +- this.mainThreadMailbox.tell(ChunkTaskPriorityQueueSorter.message(holder, runnable)); +- }).thenApplyAsync((chunkresult) -> { +- return chunkresult.ifSuccess((chunk) -> { +- chunk.postProcessGeneration(); +- this.level.startTickingChunk(chunk); +- CompletableFuture<?> completablefuture2 = holder.getChunkSendSyncFuture(); +- +- if (completablefuture2.isDone()) { +- this.onChunkReadyToSend(chunk); +- } else { +- completablefuture2.thenAcceptAsync((object) -> { +- this.onChunkReadyToSend(chunk); +- }, this.mainThreadExecutor); +- } +- +- }); +- }, this.mainThreadExecutor); +- +- completablefuture1.handle((chunkresult, throwable) -> { +- this.tickingGenerated.getAndIncrement(); +- return null; +- }); +- return completablefuture1; ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + private void onChunkReadyToSend(LevelChunk chunk) { +- ChunkPos chunkcoordintpair = chunk.getPos(); +- Iterator iterator = this.playerMap.getAllPlayers().iterator(); +- +- while (iterator.hasNext()) { +- ServerPlayer entityplayer = (ServerPlayer) iterator.next(); +- +- if (entityplayer.getChunkTrackingView().contains(chunkcoordintpair)) { +- ChunkMap.markChunkPendingToSend(entityplayer, chunk); +- } +- } ++ throw new UnsupportedOperationException(); // Paper - rewrite player chunk loader + + } + + public CompletableFuture<ChunkResult<LevelChunk>> prepareAccessibleChunk(ChunkHolder holder) { +- return this.getChunkRangeFuture(holder, 1, ChunkStatus::getStatusAroundFullChunk).thenApplyAsync((chunkresult) -> { +- return chunkresult.map((list) -> { +- return (LevelChunk) list.get(list.size() / 2); +- }); +- }, (runnable) -> { +- this.mainThreadMailbox.tell(ChunkTaskPriorityQueueSorter.message(holder, runnable)); +- }); ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + public int getTickingGenerated() { +@@ -1052,96 +625,15 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider + } + + private boolean saveChunkIfNeeded(ChunkHolder chunkHolder) { +- if (!chunkHolder.wasAccessibleSinceLastSave()) { +- return false; +- } else { +- ChunkAccess ichunkaccess = (ChunkAccess) chunkHolder.getChunkToSave().getNow(null); // CraftBukkit - decompile error +- +- if (!(ichunkaccess instanceof ImposterProtoChunk) && !(ichunkaccess instanceof LevelChunk)) { +- return false; +- } else { +- long i = ichunkaccess.getPos().toLong(); +- long j = this.chunkSaveCooldowns.getOrDefault(i, -1L); +- long k = System.currentTimeMillis(); +- +- if (k < j) { +- return false; +- } else { +- boolean flag = this.save(ichunkaccess); +- +- chunkHolder.refreshAccessibility(); +- if (flag) { +- this.chunkSaveCooldowns.put(i, k + 10000L); +- } +- +- return flag; +- } +- } +- } ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + public boolean save(ChunkAccess chunk) { +- this.poiManager.flush(chunk.getPos()); +- if (!chunk.isUnsaved()) { +- return false; +- } else { +- chunk.setUnsaved(false); +- ChunkPos chunkcoordintpair = chunk.getPos(); +- +- try { +- ChunkStatus chunkstatus = chunk.getStatus(); +- +- if (chunkstatus.getChunkType() != ChunkType.LEVELCHUNK) { +- if (this.isExistingChunkFull(chunkcoordintpair)) { +- return false; +- } +- +- if (chunkstatus == ChunkStatus.EMPTY && chunk.getAllStarts().values().stream().noneMatch(StructureStart::isValid)) { +- return false; +- } +- } +- +- this.level.getProfiler().incrementCounter("chunkSave"); +- CompoundTag nbttagcompound = ChunkSerializer.write(this.level, chunk); +- +- this.write(chunkcoordintpair, nbttagcompound).exceptionallyAsync((throwable) -> { +- this.level.getServer().reportChunkSaveFailure(chunkcoordintpair); +- return null; +- }, this.mainThreadExecutor); +- this.markPosition(chunkcoordintpair, chunkstatus.getChunkType()); +- return true; +- } catch (Exception exception) { +- ChunkMap.LOGGER.error("Failed to save chunk {},{}", new Object[]{chunkcoordintpair.x, chunkcoordintpair.z, exception}); +- this.level.getServer().reportChunkSaveFailure(chunkcoordintpair); +- return false; +- } +- } ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + private boolean isExistingChunkFull(ChunkPos pos) { +- byte b0 = this.chunkTypeCache.get(pos.toLong()); +- +- if (b0 != 0) { +- return b0 == 1; +- } else { +- CompoundTag nbttagcompound; +- +- try { +- nbttagcompound = (CompoundTag) ((Optional) this.readChunk(pos).join()).orElse((Object) null); +- if (nbttagcompound == null) { +- this.markPositionReplaceable(pos); +- return false; +- } +- } catch (Exception exception) { +- ChunkMap.LOGGER.error("Failed to read chunk {}", pos, exception); +- this.markPositionReplaceable(pos); +- return false; +- } +- +- ChunkType chunktype = ChunkSerializer.getChunkTypeFromTag(nbttagcompound); +- +- return this.markPosition(pos, chunktype) == 1; +- } ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + public void setServerViewDistance(int watchDistance) { // Paper - public +@@ -1149,37 +641,36 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider + + if (j != this.serverViewDistance) { + this.serverViewDistance = j; +- this.distanceManager.updatePlayerTickets(this.serverViewDistance); +- Iterator iterator = this.playerMap.getAllPlayers().iterator(); ++ this.level.playerChunkLoader.setLoadDistance(this.serverViewDistance + 1); // Paper - replace player loader system ++ } + +- while (iterator.hasNext()) { +- ServerPlayer entityplayer = (ServerPlayer) iterator.next(); ++ } + +- this.updateChunkTracking(entityplayer); +- } +- } ++ // Paper start - replace player loader system ++ public void setTickViewDistance(int distance) { ++ this.level.playerChunkLoader.setTickDistance(distance); ++ } + ++ public void setSendViewDistance(int distance) { ++ this.level.playerChunkLoader.setSendDistance(distance); + } ++ // Paper end - replace player loader system + + public int getPlayerViewDistance(ServerPlayer player) { // Paper - public +- return Mth.clamp(player.requestedViewDistance(), 2, this.serverViewDistance); ++ return io.papermc.paper.chunk.system.ChunkSystem.getSendViewDistance(player); // Paper - per player view distance + } + + private void markChunkPendingToSend(ServerPlayer player, ChunkPos pos) { +- LevelChunk chunk = this.getChunkToSend(pos.toLong()); +- +- if (chunk != null) { +- ChunkMap.markChunkPendingToSend(player, chunk); +- } ++ throw new UnsupportedOperationException(); // Paper - per player view distance + + } + + private static void markChunkPendingToSend(ServerPlayer player, LevelChunk chunk) { +- player.connection.chunkSender.markChunkPendingToSend(chunk); ++ throw new UnsupportedOperationException(); // Paper - rewrite player chunk loader + } + + private static void dropChunk(ServerPlayer player, ChunkPos pos) { +- player.connection.chunkSender.dropChunk(player, pos); ++ // Paper - rewrite player chunk loader + } + + @Nullable +@@ -1202,30 +693,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider + } + + void dumpChunks(Writer writer) throws IOException { +- CsvOutput csvwriter = CsvOutput.builder().addColumn("x").addColumn("z").addColumn("level").addColumn("in_memory").addColumn("status").addColumn("full_status").addColumn("accessible_ready").addColumn("ticking_ready").addColumn("entity_ticking_ready").addColumn("ticket").addColumn("spawning").addColumn("block_entity_count").addColumn("ticking_ticket").addColumn("ticking_level").addColumn("block_ticks").addColumn("fluid_ticks").build(writer); +- TickingTracker tickingtracker = this.distanceManager.tickingTracker(); +- Iterator<ChunkHolder> objectbidirectionaliterator = io.papermc.paper.chunk.system.ChunkSystem.getVisibleChunkHolders(this.level).iterator(); // Paper +- +- while (objectbidirectionaliterator.hasNext()) { +- ChunkHolder playerchunk = objectbidirectionaliterator.next(); // Paper +- long i = playerchunk.pos.toLong(); // Paper +- ChunkPos chunkcoordintpair = new ChunkPos(i); +- // Paper +- Optional<ChunkAccess> optional = Optional.ofNullable(playerchunk.getLastAvailable()); +- Optional<LevelChunk> optional1 = optional.flatMap((ichunkaccess) -> { +- return ichunkaccess instanceof LevelChunk ? Optional.of((LevelChunk) ichunkaccess) : Optional.empty(); +- }); +- +- // CraftBukkit - decompile error +- csvwriter.writeRow(chunkcoordintpair.x, chunkcoordintpair.z, playerchunk.getTicketLevel(), optional.isPresent(), optional.map(ChunkAccess::getStatus).orElse(null), optional1.map(LevelChunk::getFullStatus).orElse(null), ChunkMap.printFuture(playerchunk.getFullChunkFuture()), ChunkMap.printFuture(playerchunk.getTickingChunkFuture()), ChunkMap.printFuture(playerchunk.getEntityTickingChunkFuture()), this.distanceManager.getTicketDebugString(i), this.anyPlayerCloseEnoughForSpawning(chunkcoordintpair), optional1.map((chunk) -> { +- return chunk.getBlockEntities().size(); +- }).orElse(0), tickingtracker.getTicketDebugString(i), tickingtracker.getLevel(i), optional1.map((chunk) -> { +- return chunk.getBlockTicks().count(); +- }).orElse(0), optional1.map((chunk) -> { +- return chunk.getFluidTicks().count(); +- }).orElse(0)); +- } +- ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + private static String printFuture(CompletableFuture<ChunkResult<LevelChunk>> future) { +@@ -1240,6 +708,32 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider + } + } + ++ // Paper start - Asynchronous chunk io ++ @Nullable ++ @Override ++ public CompoundTag readSync(ChunkPos chunkcoordintpair) throws IOException { ++ if (!io.papermc.paper.chunk.system.io.RegionFileIOThread.isRegionFileThread()) { ++ return io.papermc.paper.chunk.system.io.RegionFileIOThread.loadData( ++ this.level, chunkcoordintpair.x, chunkcoordintpair.z, io.papermc.paper.chunk.system.io.RegionFileIOThread.RegionFileType.CHUNK_DATA, ++ io.papermc.paper.chunk.system.io.RegionFileIOThread.getIOBlockingPriorityForCurrentThread() ++ ); ++ } ++ return super.readSync(chunkcoordintpair); ++ } ++ ++ @Override ++ public CompletableFuture<Void> write(ChunkPos chunkcoordintpair, CompoundTag nbttagcompound) throws IOException { ++ if (!io.papermc.paper.chunk.system.io.RegionFileIOThread.isRegionFileThread()) { ++ io.papermc.paper.chunk.system.io.RegionFileIOThread.scheduleSave( ++ this.level, chunkcoordintpair.x, chunkcoordintpair.z, nbttagcompound, ++ io.papermc.paper.chunk.system.io.RegionFileIOThread.RegionFileType.CHUNK_DATA); ++ return null; ++ } ++ super.write(chunkcoordintpair, nbttagcompound); ++ return null; ++ } ++ // Paper end ++ + private CompletableFuture<Optional<CompoundTag>> readChunk(ChunkPos chunkPos) { + return this.read(chunkPos).thenApplyAsync((optional) -> { + return optional.map((nbttagcompound) -> this.upgradeChunkTag(nbttagcompound, chunkPos)); // CraftBukkit +@@ -1340,8 +834,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider + this.distanceManager.addPlayer(SectionPos.of((EntityAccess) player), player); + } + +- player.setChunkTrackingView(ChunkTrackingView.EMPTY); +- this.updateChunkTracking(player); ++ // Paper - handled by player chunk loader + this.addPlayerToDistanceMaps(player); // Paper - distance maps + } else { + SectionPos sectionposition = player.getLastSectionPos(); +@@ -1352,7 +845,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider + } + + this.removePlayerFromDistanceMaps(player); // Paper - distance maps +- this.applyChunkTrackingView(player, ChunkTrackingView.EMPTY); ++ // Paper - handled by player chunk loader + } + + } +@@ -1400,71 +893,30 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider + this.playerMap.unIgnorePlayer(player); + } + +- this.updateChunkTracking(player); ++ // Paper - replaced by PlayerChunkLoader + } + + this.updateMaps(player); // Paper - distance maps + } + + private void updateChunkTracking(ServerPlayer player) { +- ChunkPos chunkcoordintpair = player.chunkPosition(); +- int i = this.getPlayerViewDistance(player); +- ChunkTrackingView chunktrackingview = player.getChunkTrackingView(); +- +- if (chunktrackingview instanceof ChunkTrackingView.Positioned chunktrackingview_a) { +- if (chunktrackingview_a.center().equals(chunkcoordintpair) && chunktrackingview_a.viewDistance() == i) { +- return; +- } +- } +- +- this.applyChunkTrackingView(player, ChunkTrackingView.of(chunkcoordintpair, i)); ++ throw new UnsupportedOperationException(); // Paper - replaced by PlayerChunkLoader + } + + private void applyChunkTrackingView(ServerPlayer player, ChunkTrackingView chunkFilter) { +- if (player.level() == this.level) { +- ChunkTrackingView chunktrackingview1 = player.getChunkTrackingView(); +- +- if (chunkFilter instanceof ChunkTrackingView.Positioned) { +- label15: +- { +- ChunkTrackingView.Positioned chunktrackingview_a = (ChunkTrackingView.Positioned) chunkFilter; +- +- if (chunktrackingview1 instanceof ChunkTrackingView.Positioned) { +- ChunkTrackingView.Positioned chunktrackingview_a1 = (ChunkTrackingView.Positioned) chunktrackingview1; +- +- if (chunktrackingview_a1.center().equals(chunktrackingview_a.center())) { +- break label15; +- } +- } +- +- player.connection.send(new ClientboundSetChunkCacheCenterPacket(chunktrackingview_a.center().x, chunktrackingview_a.center().z)); +- } +- } +- +- ChunkTrackingView.difference(chunktrackingview1, chunkFilter, (chunkcoordintpair) -> { +- this.markChunkPendingToSend(player, chunkcoordintpair); +- }, (chunkcoordintpair) -> { +- ChunkMap.dropChunk(player, chunkcoordintpair); +- }); +- player.setChunkTrackingView(chunkFilter); +- } ++ throw new UnsupportedOperationException(); // Paper - replaced by PlayerChunkLoader + } + + @Override + public List<ServerPlayer> getPlayers(ChunkPos chunkPos, boolean onlyOnWatchDistanceEdge) { +- Set<ServerPlayer> set = this.playerMap.getAllPlayers(); +- Builder<ServerPlayer> builder = ImmutableList.builder(); +- Iterator iterator = set.iterator(); +- +- while (iterator.hasNext()) { +- ServerPlayer entityplayer = (ServerPlayer) iterator.next(); +- +- if (onlyOnWatchDistanceEdge && this.isChunkOnTrackedBorder(entityplayer, chunkPos.x, chunkPos.z) || !onlyOnWatchDistanceEdge && this.isChunkTracked(entityplayer, chunkPos.x, chunkPos.z)) { +- builder.add(entityplayer); +- } ++ // Paper start - per player view distance ++ ChunkHolder holder = this.getVisibleChunkIfPresent(chunkPos.toLong()); ++ if (holder == null) { ++ return new java.util.ArrayList<>(); ++ } else { ++ return holder.getPlayers(onlyOnWatchDistanceEdge); + } +- +- return builder.build(); ++ // Paper end - per player view distance + } + + public void addEntity(Entity entity) { +@@ -1535,13 +987,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider + } + + protected void tick() { +- Iterator iterator = this.playerMap.getAllPlayers().iterator(); +- +- while (iterator.hasNext()) { +- ServerPlayer entityplayer = (ServerPlayer) iterator.next(); +- +- this.updateChunkTracking(entityplayer); +- } ++ // Paper - replaced by PlayerChunkLoader + + List<ServerPlayer> list = Lists.newArrayList(); + List<ServerPlayer> list1 = this.level.players(); +@@ -1648,16 +1094,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider + } + + public void waitForLightBeforeSending(ChunkPos centerPos, int radius) { +- int j = radius + 1; +- +- ChunkPos.rangeClosed(centerPos, j).forEach((chunkcoordintpair1) -> { +- ChunkHolder playerchunk = this.getVisibleChunkIfPresent(chunkcoordintpair1.toLong()); +- +- if (playerchunk != null) { +- playerchunk.addSendDependency(this.lightEngine.waitForPendingTasks(chunkcoordintpair1.x, chunkcoordintpair1.z)); +- } +- +- }); ++ // Paper - rewrite player chunk loader + } + + public class ChunkDistanceManager extends DistanceManager { // Paper - public +@@ -1668,7 +1105,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider + + @Override + protected boolean isChunkToRemove(long pos) { +- return ChunkMap.this.toDrop.contains(pos); ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + @Nullable +diff --git a/src/main/java/net/minecraft/server/level/DistanceManager.java b/src/main/java/net/minecraft/server/level/DistanceManager.java +index 7a48ae2ba962ff56d0abff581b51f28b48bd9aae..ed5154e41ca858f4d6b4d1c276c66831c038d2a6 100644 +--- a/src/main/java/net/minecraft/server/level/DistanceManager.java ++++ b/src/main/java/net/minecraft/server/level/DistanceManager.java +@@ -38,65 +38,28 @@ import org.slf4j.Logger; + + public abstract class DistanceManager { + ++ // Paper start - rewrite chunk system ++ public io.papermc.paper.chunk.system.scheduling.ChunkHolderManager getChunkHolderManager() { ++ return this.chunkMap.level.chunkTaskScheduler.chunkHolderManager; ++ } ++ // Paper end - rewrite chunk system ++ + static final Logger LOGGER = LogUtils.getLogger(); + static final int PLAYER_TICKET_LEVEL = ChunkLevel.byStatus(FullChunkStatus.ENTITY_TICKING); + private static final int INITIAL_TICKET_LIST_CAPACITY = 4; + final Long2ObjectMap<ObjectSet<ServerPlayer>> playersPerChunk = new Long2ObjectOpenHashMap(); +- public final Long2ObjectOpenHashMap<SortedArraySet<Ticket<?>>> tickets = new Long2ObjectOpenHashMap(); +- private final DistanceManager.ChunkTicketTracker ticketTracker = new DistanceManager.ChunkTicketTracker(); ++ // Paper - rewrite chunk system + private final DistanceManager.FixedPlayerDistanceChunkTracker naturalSpawnChunkCounter = new DistanceManager.FixedPlayerDistanceChunkTracker(8); +- private final TickingTracker tickingTicketsTracker = new TickingTracker(); +- private final DistanceManager.PlayerTicketTracker playerTicketManager = new DistanceManager.PlayerTicketTracker(32); +- final Set<ChunkHolder> chunksToUpdateFutures = Sets.newHashSet(); +- final ChunkTaskPriorityQueueSorter ticketThrottler; +- final ProcessorHandle<ChunkTaskPriorityQueueSorter.Message<Runnable>> ticketThrottlerInput; +- final ProcessorHandle<ChunkTaskPriorityQueueSorter.Release> ticketThrottlerReleaser; +- final LongSet ticketsToRelease = new LongOpenHashSet(); +- final Executor mainThreadExecutor; +- private long ticketTickCounter; +- public int simulationDistance = 10; ++ // Paper - rewrite chunk system + private final ChunkMap chunkMap; // Paper + + protected DistanceManager(Executor workerExecutor, Executor mainThreadExecutor, ChunkMap chunkMap) { +- Objects.requireNonNull(mainThreadExecutor); +- ProcessorHandle<Runnable> mailbox = ProcessorHandle.of("player ticket throttler", mainThreadExecutor::execute); +- ChunkTaskPriorityQueueSorter chunktaskqueuesorter = new ChunkTaskPriorityQueueSorter(ImmutableList.of(mailbox), workerExecutor, 4); +- +- this.ticketThrottler = chunktaskqueuesorter; +- this.ticketThrottlerInput = chunktaskqueuesorter.getProcessor(mailbox, true); +- this.ticketThrottlerReleaser = chunktaskqueuesorter.getReleaseProcessor(mailbox); +- this.mainThreadExecutor = mainThreadExecutor; ++ // Paper - rewrite chunk system + this.chunkMap = chunkMap; // Paper + } + + protected void purgeStaleTickets() { +- ++this.ticketTickCounter; +- ObjectIterator<Entry<SortedArraySet<Ticket<?>>>> objectiterator = this.tickets.long2ObjectEntrySet().fastIterator(); +- +- while (objectiterator.hasNext()) { +- Entry<SortedArraySet<Ticket<?>>> entry = (Entry) objectiterator.next(); +- Iterator<Ticket<?>> iterator = ((SortedArraySet) entry.getValue()).iterator(); +- boolean flag = false; +- +- while (iterator.hasNext()) { +- Ticket<?> ticket = (Ticket) iterator.next(); +- +- if (ticket.timedOut(this.ticketTickCounter)) { +- iterator.remove(); +- flag = true; +- this.tickingTicketsTracker.removeTicket(entry.getLongKey(), ticket); +- } +- } +- +- if (flag) { +- this.ticketTracker.update(entry.getLongKey(), DistanceManager.getTicketLevelAt((SortedArraySet) entry.getValue()), false); +- } +- +- if (((SortedArraySet) entry.getValue()).isEmpty()) { +- objectiterator.remove(); +- } +- } +- ++ this.getChunkHolderManager().tick(); // Paper - rewrite chunk system + } + + private static int getTicketLevelAt(SortedArraySet<Ticket<?>> tickets) { +@@ -112,108 +75,25 @@ public abstract class DistanceManager { + protected abstract ChunkHolder updateChunkScheduling(long pos, int level, @Nullable ChunkHolder holder, int k); + + public boolean runAllUpdates(ChunkMap chunkStorage) { +- this.naturalSpawnChunkCounter.runAllUpdates(); +- this.tickingTicketsTracker.runAllUpdates(); +- this.playerTicketManager.runAllUpdates(); +- int i = Integer.MAX_VALUE - this.ticketTracker.runDistanceUpdates(Integer.MAX_VALUE); +- boolean flag = i != 0; +- +- if (flag) { +- ; +- } +- +- if (!this.chunksToUpdateFutures.isEmpty()) { +- // CraftBukkit start +- // Iterate pending chunk updates with protection against concurrent modification exceptions +- java.util.Iterator<ChunkHolder> iter = this.chunksToUpdateFutures.iterator(); +- int expectedSize = this.chunksToUpdateFutures.size(); +- do { +- ChunkHolder playerchunk = iter.next(); +- iter.remove(); +- expectedSize--; +- +- playerchunk.updateFutures(chunkStorage, this.mainThreadExecutor); +- +- // Reset iterator if set was modified using add() +- if (this.chunksToUpdateFutures.size() != expectedSize) { +- expectedSize = this.chunksToUpdateFutures.size(); +- iter = this.chunksToUpdateFutures.iterator(); +- } +- } while (iter.hasNext()); +- // CraftBukkit end +- +- return true; +- } else { +- if (!this.ticketsToRelease.isEmpty()) { +- LongIterator longiterator = this.ticketsToRelease.iterator(); +- +- while (longiterator.hasNext()) { +- long j = longiterator.nextLong(); +- +- if (this.getTickets(j).stream().anyMatch((ticket) -> { +- return ticket.getType() == TicketType.PLAYER; +- })) { +- ChunkHolder playerchunk = chunkStorage.getUpdatingChunkIfPresent(j); +- +- if (playerchunk == null) { +- throw new IllegalStateException(); +- } +- +- CompletableFuture<ChunkResult<LevelChunk>> completablefuture = playerchunk.getEntityTickingChunkFuture(); +- +- completablefuture.thenAccept((chunkresult) -> { +- this.mainThreadExecutor.execute(() -> { +- this.ticketThrottlerReleaser.tell(ChunkTaskPriorityQueueSorter.release(() -> { +- }, j, false)); +- }); +- }); +- } +- } +- +- this.ticketsToRelease.clear(); +- } +- +- return flag; +- } ++ return this.getChunkHolderManager().processTicketUpdates(); // Paper - rewrite chunk system + } + + boolean addTicket(long i, Ticket<?> ticket) { // CraftBukkit - void -> boolean +- SortedArraySet<Ticket<?>> arraysetsorted = this.getTickets(i); +- int j = DistanceManager.getTicketLevelAt(arraysetsorted); +- Ticket<?> ticket1 = (Ticket) arraysetsorted.addOrGet(ticket); +- +- ticket1.setCreatedTick(this.ticketTickCounter); +- if (ticket.getTicketLevel() < j) { +- this.ticketTracker.update(i, ticket.getTicketLevel(), true); +- } +- +- return ticket == ticket1; // CraftBukkit ++ org.spigotmc.AsyncCatcher.catchOp("ChunkMapDistance::addTicket"); // Paper ++ return this.getChunkHolderManager().addTicketAtLevel((TicketType)ticket.getType(), i, ticket.getTicketLevel(), ticket.key); // Paper - rewrite chunk system + } + + boolean removeTicket(long i, Ticket<?> ticket) { // CraftBukkit - void -> boolean +- SortedArraySet<Ticket<?>> arraysetsorted = this.getTickets(i); +- +- boolean removed = false; // CraftBukkit +- if (arraysetsorted.remove(ticket)) { +- removed = true; // CraftBukkit +- } +- +- if (arraysetsorted.isEmpty()) { +- this.tickets.remove(i); +- } +- +- this.ticketTracker.update(i, DistanceManager.getTicketLevelAt(arraysetsorted), false); +- return removed; // CraftBukkit ++ org.spigotmc.AsyncCatcher.catchOp("ChunkMapDistance::removeTicket"); // Paper ++ return this.getChunkHolderManager().removeTicketAtLevel((TicketType)ticket.getType(), i, ticket.getTicketLevel(), ticket.key); // Paper - rewrite chunk system + } + + public <T> void addTicket(TicketType<T> type, ChunkPos pos, int level, T argument) { +- this.addTicket(pos.toLong(), new Ticket<>(type, level, argument)); ++ this.getChunkHolderManager().addTicketAtLevel(type, pos, level, argument); // Paper - rewrite chunk system + } + + public <T> void removeTicket(TicketType<T> type, ChunkPos pos, int level, T argument) { +- Ticket<T> ticket = new Ticket<>(type, level, argument); +- +- this.removeTicket(pos.toLong(), ticket); ++ this.getChunkHolderManager().removeTicketAtLevel(type, pos, level, argument); // Paper - rewrite chunk system + } + + public <T> void addRegionTicket(TicketType<T> type, ChunkPos pos, int radius, T argument) { +@@ -222,13 +102,7 @@ public abstract class DistanceManager { + } + + public <T> boolean addRegionTicketAtDistance(TicketType<T> tickettype, ChunkPos chunkcoordintpair, int i, T t0) { +- // CraftBukkit end +- Ticket<T> ticket = new Ticket<>(tickettype, ChunkLevel.byStatus(FullChunkStatus.FULL) - i, t0); +- long j = chunkcoordintpair.toLong(); +- +- boolean added = this.addTicket(j, ticket); // CraftBukkit +- this.tickingTicketsTracker.addTicket(j, ticket); +- return added; // CraftBukkit ++ return this.getChunkHolderManager().addTicketAtLevel(tickettype, chunkcoordintpair, ChunkLevel.byStatus(FullChunkStatus.FULL) - i, t0); // Paper - rewrite chunk system + } + + public <T> void removeRegionTicket(TicketType<T> type, ChunkPos pos, int radius, T argument) { +@@ -237,31 +111,21 @@ public abstract class DistanceManager { + } + + public <T> boolean removeRegionTicketAtDistance(TicketType<T> tickettype, ChunkPos chunkcoordintpair, int i, T t0) { +- // CraftBukkit end +- Ticket<T> ticket = new Ticket<>(tickettype, ChunkLevel.byStatus(FullChunkStatus.FULL) - i, t0); +- long j = chunkcoordintpair.toLong(); +- +- boolean removed = this.removeTicket(j, ticket); // CraftBukkit +- this.tickingTicketsTracker.removeTicket(j, ticket); +- return removed; // CraftBukkit ++ return this.getChunkHolderManager().removeTicketAtLevel(tickettype, chunkcoordintpair, ChunkLevel.byStatus(FullChunkStatus.FULL) - i, t0); // Paper - rewrite chunk system + } + +- private SortedArraySet<Ticket<?>> getTickets(long position) { +- return (SortedArraySet) this.tickets.computeIfAbsent(position, (j) -> { +- return SortedArraySet.create(4); +- }); +- } ++ // Paper - rewrite chunk system + + protected void updateChunkForced(ChunkPos pos, boolean forced) { +- Ticket<ChunkPos> ticket = new Ticket<>(TicketType.FORCED, ChunkMap.FORCED_TICKET_LEVEL, pos); ++ Ticket<ChunkPos> ticket = new Ticket<>(TicketType.FORCED, ChunkMap.FORCED_TICKET_LEVEL, pos, 0L); // Paper - rewrite chunk system + long i = pos.toLong(); + + if (forced) { + this.addTicket(i, ticket); +- this.tickingTicketsTracker.addTicket(i, ticket); ++ //this.tickingTicketsTracker.addTicket(i, ticket); // Paper - no longer used + } else { + this.removeTicket(i, ticket); +- this.tickingTicketsTracker.removeTicket(i, ticket); ++ //this.tickingTicketsTracker.removeTicket(i, ticket); // Paper - no longer used + } + + } +@@ -270,12 +134,10 @@ public abstract class DistanceManager { + ChunkPos chunkcoordintpair = pos.chunk(); + long i = chunkcoordintpair.toLong(); + +- ((ObjectSet) this.playersPerChunk.computeIfAbsent(i, (j) -> { +- return new ObjectOpenHashSet(); +- })).add(player); ++ // Paper - no longer used + this.naturalSpawnChunkCounter.update(i, 0, true); +- this.playerTicketManager.update(i, 0, true); +- this.tickingTicketsTracker.addTicket(TicketType.PLAYER, chunkcoordintpair, this.getPlayerTicketLevel(), chunkcoordintpair); ++ //this.playerTicketManager.update(i, 0, true); // Paper - no longer used ++ //this.tickingTicketsTracker.addTicket(TicketType.PLAYER, chunkcoordintpair, this.getPlayerTicketLevel(), chunkcoordintpair); // Paper - no longer used + } + + public void removePlayer(SectionPos pos, ServerPlayer player) { +@@ -288,40 +150,44 @@ public abstract class DistanceManager { + if (objectset == null || objectset.isEmpty()) { // Paper + this.playersPerChunk.remove(i); + this.naturalSpawnChunkCounter.update(i, Integer.MAX_VALUE, false); +- this.playerTicketManager.update(i, Integer.MAX_VALUE, false); +- this.tickingTicketsTracker.removeTicket(TicketType.PLAYER, chunkcoordintpair, this.getPlayerTicketLevel(), chunkcoordintpair); ++ //this.playerTicketManager.update(i, Integer.MAX_VALUE, false); // Paper - no longer used ++ //this.tickingTicketsTracker.removeTicket(TicketType.PLAYER, chunkcoordintpair, this.getPlayerTicketLevel(), chunkcoordintpair); // Paper - no longer used + } + + } + +- private int getPlayerTicketLevel() { +- return Math.max(0, ChunkLevel.byStatus(FullChunkStatus.ENTITY_TICKING) - this.simulationDistance); +- } ++ // Paper - rewrite chunk system + + public boolean inEntityTickingRange(long chunkPos) { +- return ChunkLevel.isEntityTicking(this.tickingTicketsTracker.getLevel(chunkPos)); ++ // Paper start - replace player chunk loader system ++ ChunkHolder holder = this.chunkMap.getVisibleChunkIfPresent(chunkPos); ++ return holder != null && holder.isEntityTickingReady(); ++ // Paper end - replace player chunk loader system + } + + public boolean inBlockTickingRange(long chunkPos) { +- return ChunkLevel.isBlockTicking(this.tickingTicketsTracker.getLevel(chunkPos)); ++ // Paper start - replace player chunk loader system ++ ChunkHolder holder = this.chunkMap.getVisibleChunkIfPresent(chunkPos); ++ return holder != null && holder.isTickingReady(); ++ // Paper end - replace player chunk loader system + } + + protected String getTicketDebugString(long pos) { +- SortedArraySet<Ticket<?>> arraysetsorted = (SortedArraySet) this.tickets.get(pos); +- +- return arraysetsorted != null && !arraysetsorted.isEmpty() ? ((Ticket) arraysetsorted.first()).toString() : "no_ticket"; ++ return this.getChunkHolderManager().getTicketDebugString(pos); // Paper - rewrite chunk system + } + + protected void updatePlayerTickets(int viewDistance) { +- this.playerTicketManager.updateViewDistance(viewDistance); ++ this.chunkMap.setServerViewDistance(viewDistance); // Paper - route to player chunk manager + } + +- public void updateSimulationDistance(int simulationDistance) { +- if (simulationDistance != this.simulationDistance) { +- this.simulationDistance = simulationDistance; +- this.tickingTicketsTracker.replacePlayerTicketsLevel(this.getPlayerTicketLevel()); +- } ++ // Paper start ++ public int getSimulationDistance() { ++ return this.chunkMap.level.playerChunkLoader.getAPITickDistance(); ++ } ++ // Paper end + ++ public void updateSimulationDistance(int simulationDistance) { ++ this.chunkMap.level.playerChunkLoader.setTickDistance(simulationDistance); // Paper - route to player chunk manager + } + + public int getNaturalSpawnChunkCount() { +@@ -335,103 +201,26 @@ public abstract class DistanceManager { + } + + public String getDebugStatus() { +- return this.ticketThrottler.getDebugStatus(); ++ return "No DistanceManager stats available"; // Paper - rewrite chunk system + } + +- private void dumpTickets(String path) { +- try { +- FileOutputStream fileoutputstream = new FileOutputStream(new File(path)); +- +- try { +- ObjectIterator objectiterator = this.tickets.long2ObjectEntrySet().iterator(); +- +- while (objectiterator.hasNext()) { +- Entry<SortedArraySet<Ticket<?>>> entry = (Entry) objectiterator.next(); +- ChunkPos chunkcoordintpair = new ChunkPos(entry.getLongKey()); +- Iterator iterator = ((SortedArraySet) entry.getValue()).iterator(); +- +- while (iterator.hasNext()) { +- Ticket<?> ticket = (Ticket) iterator.next(); +- +- fileoutputstream.write((chunkcoordintpair.x + "\t" + chunkcoordintpair.z + "\t" + String.valueOf(ticket.getType()) + "\t" + ticket.getTicketLevel() + "\t\n").getBytes(StandardCharsets.UTF_8)); +- } +- } +- } catch (Throwable throwable) { +- try { +- fileoutputstream.close(); +- } catch (Throwable throwable1) { +- throwable.addSuppressed(throwable1); +- } +- +- throw throwable; +- } +- +- fileoutputstream.close(); +- } catch (IOException ioexception) { +- DistanceManager.LOGGER.error("Failed to dump tickets to {}", path, ioexception); +- } +- +- } +- +- @VisibleForTesting +- TickingTracker tickingTracker() { +- return this.tickingTicketsTracker; +- } ++ // Paper - rewrite chunk system + + public void removeTicketsOnClosing() { +- ImmutableSet<TicketType<?>> immutableset = ImmutableSet.of(TicketType.UNKNOWN, TicketType.POST_TELEPORT, TicketType.LIGHT, TicketType.FUTURE_AWAIT, TicketType.CHUNK_RELIGHT, ca.spottedleaf.starlight.common.light.StarLightInterface.CHUNK_WORK_TICKET); // Paper - add additional tickets to preserve +- ObjectIterator<Entry<SortedArraySet<Ticket<?>>>> objectiterator = this.tickets.long2ObjectEntrySet().fastIterator(); +- +- while (objectiterator.hasNext()) { +- Entry<SortedArraySet<Ticket<?>>> entry = (Entry) objectiterator.next(); +- Iterator<Ticket<?>> iterator = ((SortedArraySet) entry.getValue()).iterator(); +- boolean flag = false; +- +- while (iterator.hasNext()) { +- Ticket<?> ticket = (Ticket) iterator.next(); +- +- if (!immutableset.contains(ticket.getType())) { +- iterator.remove(); +- flag = true; +- this.tickingTicketsTracker.removeTicket(entry.getLongKey(), ticket); +- } +- } +- +- if (flag) { +- this.ticketTracker.update(entry.getLongKey(), DistanceManager.getTicketLevelAt((SortedArraySet) entry.getValue()), false); +- } +- +- if (((SortedArraySet) entry.getValue()).isEmpty()) { +- objectiterator.remove(); +- } +- } +- ++ // Paper - rewrite chunk system - this stupid hack ain't needed anymore + } + + public boolean hasTickets() { +- return !this.tickets.isEmpty(); ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + // CraftBukkit start + public <T> void removeAllTicketsFor(TicketType<T> ticketType, int ticketLevel, T ticketIdentifier) { +- Ticket<T> target = new Ticket<>(ticketType, ticketLevel, ticketIdentifier); +- +- for (java.util.Iterator<Entry<SortedArraySet<Ticket<?>>>> iterator = this.tickets.long2ObjectEntrySet().fastIterator(); iterator.hasNext();) { +- Entry<SortedArraySet<Ticket<?>>> entry = iterator.next(); +- SortedArraySet<Ticket<?>> tickets = entry.getValue(); +- if (tickets.remove(target)) { +- // copied from removeTicket +- this.ticketTracker.update(entry.getLongKey(), DistanceManager.getTicketLevelAt(tickets), false); +- +- // can't use entry after it's removed +- if (tickets.isEmpty()) { +- iterator.remove(); +- } +- } +- } ++ this.getChunkHolderManager().removeAllTicketsFor(ticketType, ticketLevel, ticketIdentifier); // Paper - rewrite chunk system + } + // CraftBukkit end + ++ /* Paper - rewrite chunk system + private class ChunkTicketTracker extends ChunkTracker { + + private static final int MAX_LEVEL = ChunkLevel.MAX_LEVEL + 1; +@@ -478,6 +267,7 @@ public abstract class DistanceManager { + return this.runUpdates(distance); + } + } ++ */ // Paper - rewrite chunk system + + private class FixedPlayerDistanceChunkTracker extends ChunkTracker { + +@@ -557,6 +347,7 @@ public abstract class DistanceManager { + } + } + ++ /* Paper - rewrite chunk system + private class PlayerTicketTracker extends DistanceManager.FixedPlayerDistanceChunkTracker { + + private int viewDistance = 0; +@@ -652,4 +443,5 @@ public abstract class DistanceManager { + return distance <= this.viewDistance; + } + } ++ */ // Paper - rewrite chunk system + } +diff --git a/src/main/java/net/minecraft/server/level/ServerChunkCache.java b/src/main/java/net/minecraft/server/level/ServerChunkCache.java +index 2d9d4d06b75873f888ef4d8f5779a52706f821a8..f74efe41cd0da2f9749fc96fb9e0f7cf237ad1c6 100644 +--- a/src/main/java/net/minecraft/server/level/ServerChunkCache.java ++++ b/src/main/java/net/minecraft/server/level/ServerChunkCache.java +@@ -71,7 +71,7 @@ public class ServerChunkCache extends ChunkSource { + public final io.papermc.paper.util.maplist.IteratorSafeOrderedReferenceSet<LevelChunk> entityTickingChunks = new io.papermc.paper.util.maplist.IteratorSafeOrderedReferenceSet<>(4096, 0.75f, 4096, 0.15, true); + final com.destroystokyo.paper.util.concurrent.WeakSeqLock loadedChunkMapSeqLock = new com.destroystokyo.paper.util.concurrent.WeakSeqLock(); + final it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap<LevelChunk> loadedChunkMap = new it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap<>(8192, 0.5f); +- long chunkFutureAwaitCounter; ++ final java.util.concurrent.atomic.AtomicLong chunkFutureAwaitCounter = new java.util.concurrent.atomic.AtomicLong(); // Paper - chunk system rewrite + private final LevelChunk[] lastLoadedChunks = new LevelChunk[4 * 4]; + // Paper end + +@@ -195,7 +195,7 @@ public class ServerChunkCache extends ChunkSource { + public LevelChunk getChunkAtIfLoadedImmediately(int x, int z) { + long k = ChunkPos.asLong(x, z); + +- if (Thread.currentThread() == this.mainThread) { ++ if (io.papermc.paper.util.TickThread.isTickThread()) { // Paper - rewrite chunk system + return this.getChunkAtIfLoadedMainThread(x, z); + } + +@@ -247,7 +247,8 @@ public class ServerChunkCache extends ChunkSource { + @Nullable + @Override + public ChunkAccess getChunk(int x, int z, ChunkStatus leastStatus, boolean create) { +- if (Thread.currentThread() != this.mainThread) { ++ final int x1 = x; final int z1 = z; // Paper - conflict on variable change ++ if (!io.papermc.paper.util.TickThread.isTickThread()) { // Paper - rewrite chunk system + return (ChunkAccess) CompletableFuture.supplyAsync(() -> { + return this.getChunk(x, z, leastStatus, create); + }, this.mainThreadProcessor).join(); +@@ -263,15 +264,7 @@ public class ServerChunkCache extends ChunkSource { + gameprofilerfiller.incrementCounter("getChunk"); + long k = ChunkPos.asLong(x, z); + +- for (int l = 0; l < 4; ++l) { +- if (k == this.lastChunkPos[l] && leastStatus == this.lastChunkStatus[l]) { +- ChunkAccess ichunkaccess = this.lastChunk[l]; +- +- if (ichunkaccess != null) { // CraftBukkit - the chunk can become accessible in the meantime TODO for non-null chunks it might also make sense to check that the chunk's state hasn't changed in the meantime +- return ichunkaccess; +- } +- } +- } ++ // Paper - rewrite chunk system - there are no correct callbacks to remove items from cache in the new chunk system + + gameprofilerfiller.incrementCounter("getChunkCacheMiss"); + CompletableFuture<ChunkResult<ChunkAccess>> completablefuture = this.getChunkFutureMainThread(x, z, leastStatus, create); +@@ -279,9 +272,11 @@ public class ServerChunkCache extends ChunkSource { + + Objects.requireNonNull(completablefuture); + if (!completablefuture.isDone()) { // Paper ++ io.papermc.paper.chunk.system.scheduling.ChunkTaskScheduler.pushChunkWait(this.level, x1, z1); // Paper - rewrite chunk system + com.destroystokyo.paper.io.SyncLoadFinder.logSyncLoad(this.level, x, z); // Paper - Add debug for sync chunk loads + this.level.timings.syncChunkLoad.startTiming(); // Paper + chunkproviderserver_b.managedBlock(completablefuture::isDone); ++ io.papermc.paper.chunk.system.scheduling.ChunkTaskScheduler.popChunkWait(); // Paper - rewrite chunk system + this.level.timings.syncChunkLoad.stopTiming(); // Paper + } // Paper + ChunkResult<ChunkAccess> chunkresult = (ChunkResult) completablefuture.join(); +@@ -299,7 +294,7 @@ public class ServerChunkCache extends ChunkSource { + @Nullable + @Override + public LevelChunk getChunkNow(int chunkX, int chunkZ) { +- if (Thread.currentThread() != this.mainThread) { ++ if (!io.papermc.paper.util.TickThread.isTickThread()) { // Paper - rewrite chunk system + return null; + } else { + return this.getChunkAtIfLoadedMainThread(chunkX, chunkZ); // Paper - Perf: Optimise getChunkAt calls for loaded chunks +@@ -313,7 +308,7 @@ public class ServerChunkCache extends ChunkSource { + } + + public CompletableFuture<ChunkResult<ChunkAccess>> getChunkFuture(int chunkX, int chunkZ, ChunkStatus leastStatus, boolean create) { +- boolean flag1 = Thread.currentThread() == this.mainThread; ++ boolean flag1 = io.papermc.paper.util.TickThread.isTickThread(); // Paper - rewrite chunk system + CompletableFuture completablefuture; + + if (flag1) { +@@ -333,48 +328,54 @@ public class ServerChunkCache extends ChunkSource { + return completablefuture; + } + ++ + private CompletableFuture<ChunkResult<ChunkAccess>> getChunkFutureMainThread(int chunkX, int chunkZ, ChunkStatus leastStatus, boolean create) { +- ChunkPos chunkcoordintpair = new ChunkPos(chunkX, chunkZ); +- long k = chunkcoordintpair.toLong(); +- int l = ChunkLevel.byStatus(leastStatus); +- ChunkHolder playerchunk = this.getVisibleChunkIfPresent(k); ++ // Paper start - add isUrgent - old sig left in place for dirty nms plugins ++ return getChunkFutureMainThread(chunkX, chunkZ, leastStatus, create, false); ++ } ++ private CompletableFuture<ChunkResult<ChunkAccess>> getChunkFutureMainThread(int chunkX, int chunkZ, ChunkStatus leastStatus, boolean create, boolean isUrgent) { ++ // Paper start - rewrite chunk system ++ io.papermc.paper.util.TickThread.ensureTickThread(this.level, chunkX, chunkZ, "Scheduling chunk load off-main"); ++ int minLevel = ChunkLevel.byStatus(leastStatus); ++ io.papermc.paper.chunk.system.scheduling.NewChunkHolder chunkHolder = this.level.chunkTaskScheduler.chunkHolderManager.getChunkHolder(chunkX, chunkZ); + +- // CraftBukkit start - don't add new ticket for currently unloading chunk +- boolean currentlyUnloading = false; +- if (playerchunk != null) { +- FullChunkStatus oldChunkState = ChunkLevel.fullStatus(playerchunk.oldTicketLevel); +- FullChunkStatus currentChunkState = ChunkLevel.fullStatus(playerchunk.getTicketLevel()); +- currentlyUnloading = (oldChunkState.isOrAfter(FullChunkStatus.FULL) && !currentChunkState.isOrAfter(FullChunkStatus.FULL)); ++ boolean needsFullScheduling = leastStatus == ChunkStatus.FULL && (chunkHolder == null || !chunkHolder.getChunkStatus().isOrAfter(FullChunkStatus.FULL)); ++ ++ if ((chunkHolder == null || chunkHolder.getTicketLevel() > minLevel || needsFullScheduling) && !create) { ++ return ChunkHolder.UNLOADED_CHUNK_FUTURE; + } +- if (create && !currentlyUnloading) { +- // CraftBukkit end +- this.distanceManager.addTicket(TicketType.UNKNOWN, chunkcoordintpair, l, chunkcoordintpair); +- if (this.chunkAbsent(playerchunk, l)) { +- ProfilerFiller gameprofilerfiller = this.level.getProfiler(); +- +- gameprofilerfiller.push("chunkLoad"); +- this.runDistanceManagerUpdates(); +- playerchunk = this.getVisibleChunkIfPresent(k); +- gameprofilerfiller.pop(); +- if (this.chunkAbsent(playerchunk, l)) { +- throw (IllegalStateException) Util.pauseInIde(new IllegalStateException("No chunk holder after ticket has been added")); ++ ++ io.papermc.paper.chunk.system.scheduling.NewChunkHolder.ChunkCompletion chunkCompletion = chunkHolder == null ? null : chunkHolder.getLastChunkCompletion(); ++ if (needsFullScheduling || chunkCompletion == null || !chunkCompletion.genStatus().isOrAfter(leastStatus)) { ++ // schedule ++ CompletableFuture<ChunkResult<ChunkAccess>> ret = new CompletableFuture<>(); ++ Consumer<ChunkAccess> complete = (ChunkAccess chunk) -> { ++ if (chunk == null) { ++ ret.complete(ChunkResult.error("Unexpected chunk unload")); ++ } else { ++ ret.complete(ChunkResult.of(chunk)); + } +- } +- } ++ }; + +- return this.chunkAbsent(playerchunk, l) ? ChunkHolder.UNLOADED_CHUNK_FUTURE : playerchunk.getOrScheduleFuture(leastStatus, this.chunkMap); +- } ++ this.level.chunkTaskScheduler.scheduleChunkLoad( ++ chunkX, chunkZ, leastStatus, true, ++ isUrgent ? ca.spottedleaf.concurrentutil.executor.standard.PrioritisedExecutor.Priority.BLOCKING : ca.spottedleaf.concurrentutil.executor.standard.PrioritisedExecutor.Priority.NORMAL, ++ complete ++ ); + +- private boolean chunkAbsent(@Nullable ChunkHolder holder, int maxLevel) { +- return holder == null || holder.oldTicketLevel > maxLevel; // CraftBukkit using oldTicketLevel for isLoaded checks ++ return ret; ++ } else { ++ // can return now ++ return CompletableFuture.completedFuture(ChunkResult.of(chunkCompletion.chunk())); ++ } ++ // Paper end - rewrite chunk system + } + ++ // Paper - rewrite chunk system ++ + @Override + public boolean hasChunk(int x, int z) { +- ChunkHolder playerchunk = this.getVisibleChunkIfPresent((new ChunkPos(x, z)).toLong()); +- int k = ChunkLevel.byStatus(ChunkStatus.FULL); +- +- return !this.chunkAbsent(playerchunk, k); ++ return this.getChunkAtIfLoadedImmediately(x, z) != null; // Paper - rewrite chunk system + } + + @Nullable +@@ -386,22 +387,13 @@ public class ServerChunkCache extends ChunkSource { + if (playerchunk == null) { + return null; + } else { +- int l = ServerChunkCache.CHUNK_STATUSES.size() - 1; +- +- while (true) { +- ChunkStatus chunkstatus = (ChunkStatus) ServerChunkCache.CHUNK_STATUSES.get(l); +- ChunkAccess ichunkaccess = (ChunkAccess) ((ChunkResult) playerchunk.getFutureIfPresentUnchecked(chunkstatus).getNow(ChunkHolder.UNLOADED_CHUNK)).orElse((Object) null); +- +- if (ichunkaccess != null) { +- return ichunkaccess; +- } +- +- if (chunkstatus == ChunkStatus.INITIALIZE_LIGHT.getParent()) { +- return null; +- } +- +- --l; ++ // Paper start - rewrite chunk system ++ ChunkStatus status = playerchunk.getChunkHolderStatus(); ++ if (status != null && !status.isOrAfter(ChunkStatus.LIGHT.getParent())) { ++ return null; + } ++ return playerchunk.getAvailableChunkNow(); ++ // Paper end - rewrite chunk system + } + } + +@@ -415,15 +407,7 @@ public class ServerChunkCache extends ChunkSource { + } + + public boolean runDistanceManagerUpdates() { // Paper - public +- boolean flag = this.distanceManager.runAllUpdates(this.chunkMap); +- boolean flag1 = this.chunkMap.promoteChunkMap(); +- +- if (!flag && !flag1) { +- return false; +- } else { +- this.clearCache(); +- return true; +- } ++ return this.level.chunkTaskScheduler.chunkHolderManager.processTicketUpdates(); // Paper - rewrite chunk system + } + + // Paper start +@@ -433,9 +417,10 @@ public class ServerChunkCache extends ChunkSource { + // Paper end + + public boolean isPositionTicking(long pos) { +- ChunkHolder playerchunk = this.getVisibleChunkIfPresent(pos); +- +- return playerchunk == null ? false : (!this.level.shouldTickBlocksAt(pos) ? false : ((ChunkResult) playerchunk.getTickingChunkFuture().getNow(ChunkHolder.UNLOADED_LEVEL_CHUNK)).isSuccess()); ++ // Paper start - replace player chunk loader system ++ ChunkHolder holder = this.chunkMap.getVisibleChunkIfPresent(pos); ++ return holder != null && holder.isTickingReady(); ++ // Paper end - replace player chunk loader system + } + + public void save(boolean flush) { +@@ -451,17 +436,13 @@ public class ServerChunkCache extends ChunkSource { + this.close(true); + } + +- public void close(boolean save) throws IOException { +- if (save) { +- this.save(true); +- } +- // CraftBukkit end +- this.lightEngine.close(); +- this.chunkMap.close(); ++ public void close(boolean save) { // Paper - rewrite chunk system ++ this.level.chunkTaskScheduler.chunkHolderManager.close(save, true); // Paper - rewrite chunk system + } + + // CraftBukkit start - modelled on below + public void purgeUnload() { ++ if (true) return; // Paper - tickets will be removed later, this behavior isn't really well accounted for by the chunk system + this.level.getProfiler().push("purge"); + this.distanceManager.purgeStaleTickets(); + this.runDistanceManagerUpdates(); +@@ -485,6 +466,7 @@ public class ServerChunkCache extends ChunkSource { + this.level.getProfiler().popPush("chunks"); + if (tickChunks) { + this.level.timings.chunks.startTiming(); // Paper - timings ++ this.chunkMap.level.playerChunkLoader.tick(); // Paper - replace player chunk loader - this is mostly required to account for view distance changes + this.tickChunks(); + this.level.timings.chunks.stopTiming(); // Paper - timings + this.chunkMap.tick(); +@@ -587,7 +569,12 @@ public class ServerChunkCache extends ChunkSource { + ChunkHolder playerchunk = this.getVisibleChunkIfPresent(pos); + + if (playerchunk != null) { +- ((ChunkResult) playerchunk.getFullChunkFuture().getNow(ChunkHolder.UNLOADED_LEVEL_CHUNK)).ifSuccess(chunkConsumer); ++ // Paper start - rewrite chunk system ++ LevelChunk chunk = playerchunk.getFullChunkNow(); ++ if (chunk != null) { ++ chunkConsumer.accept(chunk); ++ } ++ // Paper end - rewrite chunk system + } + + } +@@ -753,17 +740,10 @@ public class ServerChunkCache extends ChunkSource { + @Override + // CraftBukkit start - process pending Chunk loadCallback() and unloadCallback() after each run task + public boolean pollTask() { +- try { + if (ServerChunkCache.this.runDistanceManagerUpdates()) { + return true; +- } else { +- ServerChunkCache.this.lightEngine.tryScheduleUpdate(); +- return super.pollTask(); + } +- } finally { +- ServerChunkCache.this.chunkMap.callbackExecutor.run(); +- } +- // CraftBukkit end ++ return super.pollTask() | ServerChunkCache.this.level.chunkTaskScheduler.executeMainThreadTask(); // Paper - rewrite chunk system + } + } + +diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java +index 7dfbb3dd6100180abd2ebab4d1e9e34928666f9e..7f8793fa8260cb8a1f55d0ba405e6df0ae6f7321 100644 +--- a/src/main/java/net/minecraft/server/level/ServerLevel.java ++++ b/src/main/java/net/minecraft/server/level/ServerLevel.java +@@ -199,7 +199,7 @@ public class ServerLevel extends Level implements WorldGenLevel { + public final PrimaryLevelData serverLevelData; // CraftBukkit - type + private int lastSpawnChunkRadius; + final EntityTickList entityTickList; +- public final PersistentEntitySectionManager<Entity> entityManager; ++ //public final PersistentEntitySectionManager<Entity> entityManager; // Paper - rewrite chunk system + private final GameEventDispatcher gameEventDispatcher; + public boolean noSave; + private final SleepStatus sleepStatus; +@@ -268,50 +268,65 @@ public class ServerLevel extends Level implements WorldGenLevel { + return true; + } + +- public final void loadChunksForMoveAsync(AABB axisalignedbb, ca.spottedleaf.concurrentutil.executor.standard.PrioritisedExecutor.Priority priority, +- java.util.function.Consumer<List<net.minecraft.world.level.chunk.ChunkAccess>> onLoad) { +- if (Thread.currentThread() != this.thread) { +- this.getChunkSource().mainThreadProcessor.execute(() -> { +- this.loadChunksForMoveAsync(axisalignedbb, priority, onLoad); +- }); +- return; +- } ++ public final void loadChunksAsync(BlockPos pos, int radiusBlocks, ++ ca.spottedleaf.concurrentutil.executor.standard.PrioritisedExecutor.Priority priority, ++ java.util.function.Consumer<List<net.minecraft.world.level.chunk.ChunkAccess>> onLoad) { ++ loadChunksAsync( ++ (pos.getX() - radiusBlocks) >> 4, ++ (pos.getX() + radiusBlocks) >> 4, ++ (pos.getZ() - radiusBlocks) >> 4, ++ (pos.getZ() + radiusBlocks) >> 4, ++ priority, onLoad ++ ); ++ } ++ ++ public final void loadChunksAsync(BlockPos pos, int radiusBlocks, ++ net.minecraft.world.level.chunk.status.ChunkStatus chunkStatus, ++ ca.spottedleaf.concurrentutil.executor.standard.PrioritisedExecutor.Priority priority, ++ java.util.function.Consumer<List<net.minecraft.world.level.chunk.ChunkAccess>> onLoad) { ++ loadChunksAsync( ++ (pos.getX() - radiusBlocks) >> 4, ++ (pos.getX() + radiusBlocks) >> 4, ++ (pos.getZ() - radiusBlocks) >> 4, ++ (pos.getZ() + radiusBlocks) >> 4, ++ chunkStatus, priority, onLoad ++ ); ++ } ++ ++ public final void loadChunksAsync(int minChunkX, int maxChunkX, int minChunkZ, int maxChunkZ, ++ ca.spottedleaf.concurrentutil.executor.standard.PrioritisedExecutor.Priority priority, ++ java.util.function.Consumer<List<net.minecraft.world.level.chunk.ChunkAccess>> onLoad) { ++ this.loadChunksAsync(minChunkX, maxChunkX, minChunkZ, maxChunkZ, net.minecraft.world.level.chunk.status.ChunkStatus.FULL, priority, onLoad); ++ } ++ ++ public final void loadChunksAsync(int minChunkX, int maxChunkX, int minChunkZ, int maxChunkZ, ++ net.minecraft.world.level.chunk.status.ChunkStatus chunkStatus, ++ ca.spottedleaf.concurrentutil.executor.standard.PrioritisedExecutor.Priority priority, ++ java.util.function.Consumer<List<net.minecraft.world.level.chunk.ChunkAccess>> onLoad) { + List<net.minecraft.world.level.chunk.ChunkAccess> ret = new java.util.ArrayList<>(); +- it.unimi.dsi.fastutil.ints.IntArrayList ticketLevels = new it.unimi.dsi.fastutil.ints.IntArrayList(); +- +- int minBlockX = Mth.floor(axisalignedbb.minX - 1.0E-7D) - 3; +- int maxBlockX = Mth.floor(axisalignedbb.maxX + 1.0E-7D) + 3; +- +- int minBlockZ = Mth.floor(axisalignedbb.minZ - 1.0E-7D) - 3; +- int maxBlockZ = Mth.floor(axisalignedbb.maxZ + 1.0E-7D) + 3; +- +- int minChunkX = minBlockX >> 4; +- int maxChunkX = maxBlockX >> 4; +- +- int minChunkZ = minBlockZ >> 4; +- int maxChunkZ = maxBlockZ >> 4; + + ServerChunkCache chunkProvider = this.getChunkSource(); + + int requiredChunks = (maxChunkX - minChunkX + 1) * (maxChunkZ - minChunkZ + 1); +- int[] loadedChunks = new int[1]; ++ java.util.concurrent.atomic.AtomicInteger loadedChunks = new java.util.concurrent.atomic.AtomicInteger(); + +- Long holderIdentifier = Long.valueOf(chunkProvider.chunkFutureAwaitCounter++); ++ Long holderIdentifier = Long.valueOf(chunkProvider.chunkFutureAwaitCounter.getAndIncrement()); ++ ++ int ticketLevel = 33 + net.minecraft.world.level.chunk.status.ChunkStatus.getDistance(chunkStatus); + + java.util.function.Consumer<net.minecraft.world.level.chunk.ChunkAccess> consumer = (net.minecraft.world.level.chunk.ChunkAccess chunk) -> { + if (chunk != null) { +- int ticketLevel = Math.max(33, chunkProvider.chunkMap.getUpdatingChunkIfPresent(chunk.getPos().toLong()).getTicketLevel()); ++ synchronized (ret) { + ret.add(chunk); +- ticketLevels.add(ticketLevel); ++ } + chunkProvider.addTicketAtLevel(TicketType.FUTURE_AWAIT, chunk.getPos(), ticketLevel, holderIdentifier); + } +- if (++loadedChunks[0] == requiredChunks) { ++ if (loadedChunks.incrementAndGet() == requiredChunks) { + try { + onLoad.accept(java.util.Collections.unmodifiableList(ret)); + } finally { + for (int i = 0, len = ret.size(); i < len; ++i) { + ChunkPos chunkPos = ret.get(i).getPos(); +- int ticketLevel = ticketLevels.getInt(i); + + chunkProvider.addTicketAtLevel(TicketType.UNKNOWN, chunkPos, ticketLevel, chunkPos); + chunkProvider.removeTicketAtLevel(TicketType.FUTURE_AWAIT, chunkPos, ticketLevel, holderIdentifier); +@@ -323,12 +338,228 @@ public class ServerLevel extends Level implements WorldGenLevel { + for (int cx = minChunkX; cx <= maxChunkX; ++cx) { + for (int cz = minChunkZ; cz <= maxChunkZ; ++cz) { + io.papermc.paper.chunk.system.ChunkSystem.scheduleChunkLoad( +- this, cx, cz, net.minecraft.world.level.chunk.status.ChunkStatus.FULL, true, priority, consumer ++ this, cx, cz, chunkStatus, true, priority, consumer + ); + } + } + } +- // Paper end ++ ++ public final void loadChunksForMoveAsync(AABB axisalignedbb, ca.spottedleaf.concurrentutil.executor.standard.PrioritisedExecutor.Priority priority, ++ java.util.function.Consumer<List<net.minecraft.world.level.chunk.ChunkAccess>> onLoad) { ++ ++ int minBlockX = Mth.floor(axisalignedbb.minX - 1.0E-7D) - 3; ++ int maxBlockX = Mth.floor(axisalignedbb.maxX + 1.0E-7D) + 3; ++ ++ int minBlockZ = Mth.floor(axisalignedbb.minZ - 1.0E-7D) - 3; ++ int maxBlockZ = Mth.floor(axisalignedbb.maxZ + 1.0E-7D) + 3; ++ ++ int minChunkX = minBlockX >> 4; ++ int maxChunkX = maxBlockX >> 4; ++ ++ int minChunkZ = minBlockZ >> 4; ++ int maxChunkZ = maxBlockZ >> 4; ++ ++ this.loadChunksAsync(minChunkX, maxChunkX, minChunkZ, maxChunkZ, priority, onLoad); ++ } ++ ++ // Paper start - rewrite chunk system ++ public final io.papermc.paper.chunk.system.scheduling.ChunkTaskScheduler chunkTaskScheduler; ++ public final io.papermc.paper.chunk.system.io.RegionFileIOThread.ChunkDataController chunkDataControllerNew ++ = new io.papermc.paper.chunk.system.io.RegionFileIOThread.ChunkDataController(io.papermc.paper.chunk.system.io.RegionFileIOThread.RegionFileType.CHUNK_DATA) { ++ ++ @Override ++ public net.minecraft.world.level.chunk.storage.RegionFileStorage getCache() { ++ return ServerLevel.this.getChunkSource().chunkMap.regionFileCache; ++ } ++ ++ @Override ++ public void writeData(int chunkX, int chunkZ, net.minecraft.nbt.CompoundTag compound) throws IOException { ++ ServerLevel.this.getChunkSource().chunkMap.write(new ChunkPos(chunkX, chunkZ), compound); ++ } ++ ++ @Override ++ public net.minecraft.nbt.CompoundTag readData(int chunkX, int chunkZ) throws IOException { ++ return ServerLevel.this.getChunkSource().chunkMap.readSync(new ChunkPos(chunkX, chunkZ)); ++ } ++ }; ++ public final io.papermc.paper.chunk.system.io.RegionFileIOThread.ChunkDataController poiDataControllerNew ++ = new io.papermc.paper.chunk.system.io.RegionFileIOThread.ChunkDataController(io.papermc.paper.chunk.system.io.RegionFileIOThread.RegionFileType.POI_DATA) { ++ ++ @Override ++ public net.minecraft.world.level.chunk.storage.RegionFileStorage getCache() { ++ return ServerLevel.this.getChunkSource().chunkMap.getPoiManager(); ++ } ++ ++ @Override ++ public void writeData(int chunkX, int chunkZ, net.minecraft.nbt.CompoundTag compound) throws IOException { ++ ServerLevel.this.getChunkSource().chunkMap.getPoiManager().write(new ChunkPos(chunkX, chunkZ), compound); ++ } ++ ++ @Override ++ public net.minecraft.nbt.CompoundTag readData(int chunkX, int chunkZ) throws IOException { ++ return ServerLevel.this.getChunkSource().chunkMap.getPoiManager().read(new ChunkPos(chunkX, chunkZ)); ++ } ++ }; ++ public final io.papermc.paper.chunk.system.io.RegionFileIOThread.ChunkDataController entityDataControllerNew ++ = new io.papermc.paper.chunk.system.io.RegionFileIOThread.ChunkDataController(io.papermc.paper.chunk.system.io.RegionFileIOThread.RegionFileType.ENTITY_DATA) { ++ ++ @Override ++ public net.minecraft.world.level.chunk.storage.RegionFileStorage getCache() { ++ return ServerLevel.this.entityStorage; ++ } ++ ++ @Override ++ public void writeData(int chunkX, int chunkZ, net.minecraft.nbt.CompoundTag compound) throws IOException { ++ ServerLevel.this.writeEntityChunk(chunkX, chunkZ, compound); ++ } ++ ++ @Override ++ public net.minecraft.nbt.CompoundTag readData(int chunkX, int chunkZ) throws IOException { ++ return ServerLevel.this.readEntityChunk(chunkX, chunkZ); ++ } ++ }; ++ private final EntityRegionFileStorage entityStorage; ++ ++ private static final class EntityRegionFileStorage extends net.minecraft.world.level.chunk.storage.RegionFileStorage { ++ ++ public EntityRegionFileStorage(RegionStorageInfo storageKey, Path directory, boolean dsync) { ++ super(storageKey, directory, dsync); ++ } ++ ++ protected void write(ChunkPos pos, net.minecraft.nbt.CompoundTag nbt) throws IOException { ++ ChunkPos nbtPos = nbt == null ? null : EntityStorage.readChunkPos(nbt); ++ if (nbtPos != null && !pos.equals(nbtPos)) { ++ throw new IllegalArgumentException( ++ "Entity chunk coordinate and serialized data do not have matching coordinates, trying to serialize coordinate " + pos.toString() ++ + " but compound says coordinate is " + nbtPos + " for world: " + this ++ ); ++ } ++ super.write(pos, nbt); ++ } ++ } ++ ++ private void writeEntityChunk(int chunkX, int chunkZ, net.minecraft.nbt.CompoundTag compound) throws IOException { ++ if (!io.papermc.paper.chunk.system.io.RegionFileIOThread.isRegionFileThread()) { ++ io.papermc.paper.chunk.system.io.RegionFileIOThread.scheduleSave( ++ this, chunkX, chunkZ, compound, ++ io.papermc.paper.chunk.system.io.RegionFileIOThread.RegionFileType.ENTITY_DATA); ++ return; ++ } ++ this.entityStorage.write(new ChunkPos(chunkX, chunkZ), compound); ++ } ++ ++ private net.minecraft.nbt.CompoundTag readEntityChunk(int chunkX, int chunkZ) throws IOException { ++ if (!io.papermc.paper.chunk.system.io.RegionFileIOThread.isRegionFileThread()) { ++ return io.papermc.paper.chunk.system.io.RegionFileIOThread.loadData( ++ this, chunkX, chunkZ, io.papermc.paper.chunk.system.io.RegionFileIOThread.RegionFileType.ENTITY_DATA, ++ io.papermc.paper.chunk.system.io.RegionFileIOThread.getIOBlockingPriorityForCurrentThread() ++ ); ++ } ++ return this.entityStorage.read(new ChunkPos(chunkX, chunkZ)); ++ } ++ ++ private final io.papermc.paper.chunk.system.entity.EntityLookup entityLookup; ++ public final io.papermc.paper.chunk.system.entity.EntityLookup getEntityLookup() { ++ return this.entityLookup; ++ } ++ ++ private final java.util.concurrent.atomic.AtomicLong nonFullSyncLoadIdGenerator = new java.util.concurrent.atomic.AtomicLong(); ++ ++ private ChunkAccess getIfAboveStatus(int chunkX, int chunkZ, net.minecraft.world.level.chunk.status.ChunkStatus status) { ++ io.papermc.paper.chunk.system.scheduling.NewChunkHolder loaded = ++ this.chunkTaskScheduler.chunkHolderManager.getChunkHolder(chunkX, chunkZ); ++ io.papermc.paper.chunk.system.scheduling.NewChunkHolder.ChunkCompletion loadedCompletion; ++ if (loaded != null && (loadedCompletion = loaded.getLastChunkCompletion()) != null && loadedCompletion.genStatus().isOrAfter(status)) { ++ return loadedCompletion.chunk(); ++ } ++ ++ return null; ++ } ++ ++ @Override ++ public ChunkAccess syncLoadNonFull(int chunkX, int chunkZ, net.minecraft.world.level.chunk.status.ChunkStatus status) { ++ if (status == null || status.isOrAfter(net.minecraft.world.level.chunk.status.ChunkStatus.FULL)) { ++ throw new IllegalArgumentException("Status: " + status); ++ } ++ ChunkAccess loaded = this.getIfAboveStatus(chunkX, chunkZ, status); ++ if (loaded != null) { ++ return loaded; ++ } ++ ++ Long ticketId = Long.valueOf(this.nonFullSyncLoadIdGenerator.getAndIncrement()); ++ int ticketLevel = 33 + net.minecraft.world.level.chunk.status.ChunkStatus.getDistance(status); ++ this.chunkTaskScheduler.chunkHolderManager.addTicketAtLevel( ++ TicketType.NON_FULL_SYNC_LOAD, chunkX, chunkZ, ticketLevel, ticketId ++ ); ++ this.chunkTaskScheduler.chunkHolderManager.processTicketUpdates(); ++ ++ this.chunkTaskScheduler.beginChunkLoadForNonFullSync(chunkX, chunkZ, status, ca.spottedleaf.concurrentutil.executor.standard.PrioritisedExecutor.Priority.BLOCKING); ++ ++ // we could do a simple spinwait here, since we do not need to process tasks while performing this load ++ // but we process tasks only because it's a better use of the time spent ++ this.chunkSource.mainThreadProcessor.managedBlock(() -> { ++ return ServerLevel.this.getIfAboveStatus(chunkX, chunkZ, status) != null; ++ }); ++ ++ loaded = ServerLevel.this.getIfAboveStatus(chunkX, chunkZ, status); ++ if (loaded == null) { ++ throw new IllegalStateException("Expected chunk to be loaded for status " + status); ++ } ++ ++ this.chunkTaskScheduler.chunkHolderManager.removeTicketAtLevel( ++ TicketType.NON_FULL_SYNC_LOAD, chunkX, chunkZ, ticketLevel, ticketId ++ ); ++ ++ return loaded; ++ } ++ ++ public final int getRegionChunkShift() { ++ // placeholder for folia ++ return io.papermc.paper.threadedregions.TickRegions.getRegionChunkShift(); ++ } ++ // Paper end - rewrite chunk system ++ ++ public final io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader playerChunkLoader = new io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader(this); ++ private final java.util.concurrent.atomic.AtomicReference<io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.ViewDistances> viewDistances = new java.util.concurrent.atomic.AtomicReference<>(new io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.ViewDistances(-1, -1, -1)); ++ ++ public io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.ViewDistances getViewDistances() { ++ return this.viewDistances.get(); ++ } ++ ++ private void updateViewDistance(final java.util.function.Function<io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.ViewDistances, io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.ViewDistances> update) { ++ for (io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.ViewDistances curr = this.viewDistances.get();;) { ++ if (this.viewDistances.compareAndSet(curr, update.apply(curr))) { ++ return; ++ } ++ } ++ } ++ ++ public void setTickViewDistance(final int distance) { ++ if ((distance < io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.MIN_VIEW_DISTANCE || distance > io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.MAX_VIEW_DISTANCE)) { ++ throw new IllegalArgumentException("Tick view distance must be a number between " + io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.MIN_VIEW_DISTANCE + " and " + (io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.MAX_VIEW_DISTANCE) + ", got: " + distance); ++ } ++ this.updateViewDistance((input) -> { ++ return input.setTickViewDistance(distance); ++ }); ++ } ++ ++ public void setLoadViewDistance(final int distance) { ++ if (distance != -1 && (distance < io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.MIN_VIEW_DISTANCE || distance > io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.MAX_VIEW_DISTANCE + 1)) { ++ throw new IllegalArgumentException("Load view distance must be a number between " + io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.MIN_VIEW_DISTANCE + " and " + (io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.MAX_VIEW_DISTANCE + 1) + " or -1, got: " + distance); ++ } ++ this.updateViewDistance((input) -> { ++ return input.setLoadViewDistance(distance); ++ }); ++ } ++ ++ public void setSendViewDistance(final int distance) { ++ if (distance != -1 && (distance < io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.MIN_VIEW_DISTANCE || distance > io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.MAX_VIEW_DISTANCE + 1)) { ++ throw new IllegalArgumentException("Send view distance must be a number between " + io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.MIN_VIEW_DISTANCE + " and " + (io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.MAX_VIEW_DISTANCE + 1) + " or -1, got: " + distance); ++ } ++ this.updateViewDistance((input) -> { ++ return input.setSendViewDistance(distance); ++ }); ++ } + + // Paper start - optimise getPlayerByUUID + @Nullable +@@ -382,16 +613,16 @@ public class ServerLevel extends Level implements WorldGenLevel { + // CraftBukkit end + boolean flag2 = minecraftserver.forceSynchronousWrites(); + DataFixer datafixer = minecraftserver.getFixerUpper(); +- EntityPersistentStorage<Entity> entitypersistentstorage = new EntityStorage(new SimpleRegionStorage(new RegionStorageInfo(convertable_conversionsession.getLevelId(), resourcekey, "entities"), convertable_conversionsession.getDimensionPath(resourcekey).resolve("entities"), datafixer, flag2, DataFixTypes.ENTITY_CHUNK), this, minecraftserver); ++ this.entityStorage = new EntityRegionFileStorage(new RegionStorageInfo(convertable_conversionsession.getLevelId(), resourcekey, "entities"), convertable_conversionsession.getDimensionPath(resourcekey).resolve("entities"), flag2); // Paper - rewrite chunk system + +- this.entityManager = new PersistentEntitySectionManager<>(Entity.class, new ServerLevel.EntityCallbacks(), entitypersistentstorage); ++ // this.entityManager = new PersistentEntitySectionManager<>(Entity.class, new ServerLevel.EntityCallbacks(), entitypersistentstorage, this.entitySliceManager); // Paper // Paper - rewrite chunk system + StructureTemplateManager structuretemplatemanager = minecraftserver.getStructureManager(); + int j = this.spigotConfig.viewDistance; // Spigot + int k = this.spigotConfig.simulationDistance; // Spigot +- PersistentEntitySectionManager persistententitysectionmanager = this.entityManager; ++ //PersistentEntitySectionManager persistententitysectionmanager = this.entityManager; // Paper - rewrite chunk system + +- Objects.requireNonNull(this.entityManager); +- this.chunkSource = new ServerChunkCache(this, convertable_conversionsession, datafixer, structuretemplatemanager, executor, chunkgenerator, j, k, flag2, worldloadlistener, persistententitysectionmanager::updateChunkStatus, () -> { ++ //Objects.requireNonNull(this.entityManager); // Paper - rewrite chunk system ++ this.chunkSource = new ServerChunkCache(this, convertable_conversionsession, datafixer, structuretemplatemanager, executor, chunkgenerator, j, k, flag2, worldloadlistener, null, () -> { // Paper - rewrite chunk system + return minecraftserver.overworld().getDataStorage(); + }); + this.chunkSource.getGeneratorState().ensureStructuresGenerated(); +@@ -426,6 +657,9 @@ public class ServerLevel extends Level implements WorldGenLevel { + return (RandomSequences) this.getDataStorage().computeIfAbsent(RandomSequences.factory(l), "random_sequences"); + }); + this.getCraftServer().addWorld(this.getWorld()); // CraftBukkit ++ ++ this.chunkTaskScheduler = new io.papermc.paper.chunk.system.scheduling.ChunkTaskScheduler(this, io.papermc.paper.chunk.system.scheduling.ChunkTaskScheduler.workerThreads); // Paper - rewrite chunk system ++ this.entityLookup = new io.papermc.paper.chunk.system.entity.EntityLookup(this, new EntityCallbacks()); // Paper - rewrite chunk system + } + + // Paper start +@@ -558,7 +792,7 @@ public class ServerLevel extends Level implements WorldGenLevel { + gameprofilerfiller.push("checkDespawn"); + entity.checkDespawn(); + gameprofilerfiller.pop(); +- if (this.chunkSource.chunkMap.getDistanceManager().inEntityTickingRange(entity.chunkPosition().toLong())) { ++ if (true || this.chunkSource.chunkMap.getDistanceManager().inEntityTickingRange(entity.chunkPosition().toLong())) { // Paper - now always true if in the ticking list + Entity entity1 = entity.getVehicle(); + + if (entity1 != null) { +@@ -583,13 +817,16 @@ public class ServerLevel extends Level implements WorldGenLevel { + } + + gameprofilerfiller.push("entityManagement"); +- this.entityManager.tick(); ++ //this.entityManager.tick(); // Paper - rewrite chunk system + gameprofilerfiller.pop(); + } + + @Override + public boolean shouldTickBlocksAt(long chunkPos) { +- return this.chunkSource.chunkMap.getDistanceManager().inBlockTickingRange(chunkPos); ++ // Paper start - replace player chunk loader system ++ ChunkHolder holder = this.chunkSource.chunkMap.getVisibleChunkIfPresent(chunkPos); ++ return holder != null && holder.isTickingReady(); ++ // Paper end - replace player chunk loader system + } + + protected void tickTime() { +@@ -1066,6 +1303,11 @@ public class ServerLevel extends Level implements WorldGenLevel { + } + + public void save(@Nullable ProgressListener progressListener, boolean flush, boolean savingDisabled) { ++ // Paper start - rewrite chunk system - add close param ++ this.save(progressListener, flush, savingDisabled, false); ++ } ++ public void save(@Nullable ProgressListener progressListener, boolean flush, boolean savingDisabled, boolean close) { ++ // Paper end - rewrite chunk system - add close param + ServerChunkCache chunkproviderserver = this.getChunkSource(); + + if (!savingDisabled) { +@@ -1081,16 +1323,13 @@ public class ServerLevel extends Level implements WorldGenLevel { + } + + timings.worldSaveChunks.startTiming(); // Paper +- chunkproviderserver.save(flush); ++ if (!close) chunkproviderserver.save(flush); // Paper - rewrite chunk system ++ if (close) chunkproviderserver.close(true); // Paper - rewrite chunk system + timings.worldSaveChunks.stopTiming(); // Paper + }// Paper +- if (flush) { +- this.entityManager.saveAll(); +- } else { +- this.entityManager.autoSave(); +- } ++ // Paper - rewrite chunk system - entity saving moved into ChunkHolder + +- } ++ } else if (close) { chunkproviderserver.close(false); } // Paper - rewrite chunk system + + // CraftBukkit start - moved from MinecraftServer.saveChunks + ServerLevel worldserver1 = this; +@@ -1226,7 +1465,7 @@ public class ServerLevel extends Level implements WorldGenLevel { + this.removePlayerImmediately((ServerPlayer) entity, Entity.RemovalReason.DISCARDED); + } + +- this.entityManager.addNewEntity(player); ++ this.entityLookup.addNewEntity(player); // Paper - rewite chunk system + } + + // CraftBukkit start +@@ -1257,7 +1496,7 @@ public class ServerLevel extends Level implements WorldGenLevel { + } + // CraftBukkit end + +- return this.entityManager.addNewEntity(entity); ++ return this.entityLookup.addNewEntity(entity); // Paper - rewrite chunk system + } + } + +@@ -1269,10 +1508,10 @@ public class ServerLevel extends Level implements WorldGenLevel { + public boolean tryAddFreshEntityWithPassengers(Entity entity, org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason reason) { + // CraftBukkit end + Stream<UUID> stream = entity.getSelfAndPassengers().map(Entity::getUUID); // CraftBukkit - decompile error +- PersistentEntitySectionManager persistententitysectionmanager = this.entityManager; ++ //PersistentEntitySectionManager persistententitysectionmanager = this.entityManager; // Paper - rewrite chunk system + +- Objects.requireNonNull(this.entityManager); +- if (stream.anyMatch(persistententitysectionmanager::isLoaded)) { ++ //Objects.requireNonNull(this.entityManager); // Paper - rewrite chunk system ++ if (stream.anyMatch(this.entityLookup::hasEntity)) { // Paper - rewrite chunk system + return false; + } else { + this.addFreshEntityWithPassengers(entity, reason); // CraftBukkit +@@ -1858,7 +2097,7 @@ public class ServerLevel extends Level implements WorldGenLevel { + } + } + +- bufferedwriter.write(String.format(Locale.ROOT, "entities: %s\n", this.entityManager.gatherStats())); ++ bufferedwriter.write(String.format(Locale.ROOT, "entities: %s\n", this.entityLookup.getDebugInfo())); // Paper - rewrite chunk system + bufferedwriter.write(String.format(Locale.ROOT, "block_entity_tickers: %d\n", this.blockEntityTickers.size())); + bufferedwriter.write(String.format(Locale.ROOT, "block_ticks: %d\n", this.getBlockTicks().count())); + bufferedwriter.write(String.format(Locale.ROOT, "fluid_ticks: %d\n", this.getFluidTicks().count())); +@@ -1907,7 +2146,7 @@ public class ServerLevel extends Level implements WorldGenLevel { + BufferedWriter bufferedwriter2 = Files.newBufferedWriter(path1); + + try { +- playerchunkmap.dumpChunks(bufferedwriter2); ++ //playerchunkmap.dumpChunks(bufferedwriter2); // Paper - rewrite chunk system + } catch (Throwable throwable4) { + if (bufferedwriter2 != null) { + try { +@@ -1928,7 +2167,7 @@ public class ServerLevel extends Level implements WorldGenLevel { + BufferedWriter bufferedwriter3 = Files.newBufferedWriter(path2); + + try { +- this.entityManager.dumpSections(bufferedwriter3); ++ //this.entityManager.dumpSections(bufferedwriter3); // Paper - rewrite chunk system + } catch (Throwable throwable6) { + if (bufferedwriter3 != null) { + try { +@@ -2070,7 +2309,7 @@ public class ServerLevel extends Level implements WorldGenLevel { + + @VisibleForTesting + public String getWatchdogStats() { +- return String.format(Locale.ROOT, "players: %s, entities: %s [%s], block_entities: %d [%s], block_ticks: %d, fluid_ticks: %d, chunk_source: %s", this.players.size(), this.entityManager.gatherStats(), ServerLevel.getTypeCount(this.entityManager.getEntityGetter().getAll(), (entity) -> { ++ return String.format(Locale.ROOT, "players: %s, entities: %s [%s], block_entities: %d [%s], block_ticks: %d, fluid_ticks: %d, chunk_source: %s", this.players.size(), this.entityLookup.getDebugInfo(), ServerLevel.getTypeCount(this.entityLookup.getAll(), (entity) -> { // Paper - rewrite chunk system + return BuiltInRegistries.ENTITY_TYPE.getKey(entity.getType()).toString(); + }), this.blockEntityTickers.size(), ServerLevel.getTypeCount(this.blockEntityTickers, TickingBlockEntity::getType), this.getBlockTicks().count(), this.getFluidTicks().count(), this.gatherChunkSourceStats()); + } +@@ -2130,15 +2369,15 @@ public class ServerLevel extends Level implements WorldGenLevel { + @Override + public LevelEntityGetter<Entity> getEntities() { + org.spigotmc.AsyncCatcher.catchOp("Chunk getEntities call"); // Spigot +- return this.entityManager.getEntityGetter(); ++ return this.entityLookup; // Paper - rewrite chunk system + } + +- public void addLegacyChunkEntities(Stream<Entity> entities) { +- this.entityManager.addLegacyChunkEntities(entities); ++ public void addLegacyChunkEntities(Stream<Entity> entities, ChunkPos forChunk) { // Paper - rewrite chunk system ++ this.entityLookup.addLegacyChunkEntities(entities.toList(), forChunk); // Paper - rewrite chunk system + } + +- public void addWorldGenChunkEntities(Stream<Entity> entities) { +- this.entityManager.addWorldGenChunkEntities(entities); ++ public void addWorldGenChunkEntities(Stream<Entity> entities, ChunkPos forChunk) { // Paper - rewrite chunk system ++ this.entityLookup.addWorldGenChunkEntities(entities.toList(), forChunk); // Paper - rewrite chunk system + } + + public void startTickingChunk(LevelChunk chunk) { +@@ -2158,34 +2397,49 @@ public class ServerLevel extends Level implements WorldGenLevel { + @Override + public void close() throws IOException { + super.close(); +- this.entityManager.close(); ++ //this.entityManager.close(); // Paper - rewrite chunk system + } + + @Override + public String gatherChunkSourceStats() { + String s = this.chunkSource.gatherStats(); + +- return "Chunks[S] W: " + s + " E: " + this.entityManager.gatherStats(); ++ return "Chunks[S] W: " + s + " E: " + this.entityLookup.getDebugInfo(); // Paper - rewrite chunk system + } + + public boolean areEntitiesLoaded(long chunkPos) { +- return this.entityManager.areEntitiesLoaded(chunkPos); ++ // Paper start - rewrite chunk system ++ return this.getChunkIfLoadedImmediately(ChunkPos.getX(chunkPos), ChunkPos.getZ(chunkPos)) != null; ++ // Paper end - rewrite chunk system + } + + private boolean isPositionTickingWithEntitiesLoaded(long chunkPos) { +- return this.areEntitiesLoaded(chunkPos) && this.chunkSource.isPositionTicking(chunkPos); ++ // Paper start - optimize is ticking ready type functions ++ io.papermc.paper.chunk.system.scheduling.NewChunkHolder chunkHolder = this.chunkTaskScheduler.chunkHolderManager.getChunkHolder(chunkPos); ++ // isTicking implies the chunk is loaded, and the chunk is loaded now implies the entities are loaded ++ return chunkHolder != null && chunkHolder.isTickingReady(); ++ // Paper end + } + + public boolean isPositionEntityTicking(BlockPos pos) { +- return this.entityManager.canPositionTick(pos) && this.chunkSource.chunkMap.getDistanceManager().inEntityTickingRange(ChunkPos.asLong(pos)); ++ // Paper start - rewrite chunk system ++ io.papermc.paper.chunk.system.scheduling.NewChunkHolder chunkHolder = this.chunkTaskScheduler.chunkHolderManager.getChunkHolder(io.papermc.paper.util.CoordinateUtils.getChunkKey(pos)); ++ return chunkHolder != null && chunkHolder.isEntityTickingReady(); ++ // Paper end - rewrite chunk system + } + + public boolean isNaturalSpawningAllowed(BlockPos pos) { +- return this.entityManager.canPositionTick(pos); ++ // Paper start - rewrite chunk system ++ io.papermc.paper.chunk.system.scheduling.NewChunkHolder chunkHolder = this.chunkTaskScheduler.chunkHolderManager.getChunkHolder(io.papermc.paper.util.CoordinateUtils.getChunkKey(pos)); ++ return chunkHolder != null && chunkHolder.isEntityTickingReady(); ++ // Paper end - rewrite chunk system + } + + public boolean isNaturalSpawningAllowed(ChunkPos pos) { +- return this.entityManager.canPositionTick(pos); ++ // Paper start - rewrite chunk system ++ io.papermc.paper.chunk.system.scheduling.NewChunkHolder chunkHolder = this.chunkTaskScheduler.chunkHolderManager.getChunkHolder(io.papermc.paper.util.CoordinateUtils.getChunkKey(pos)); ++ return chunkHolder != null && chunkHolder.isEntityTickingReady(); ++ // Paper end - rewrite chunk system + } + + @Override +@@ -2211,7 +2465,7 @@ public class ServerLevel extends Level implements WorldGenLevel { + CrashReportCategory crashreportsystemdetails = super.fillReportDetails(report); + + crashreportsystemdetails.setDetail("Loaded entity count", () -> { +- return String.valueOf(this.entityManager.count()); ++ return String.valueOf(this.entityLookup.getAllCopy().length); // Paper + }); + return crashreportsystemdetails; + } +diff --git a/src/main/java/net/minecraft/server/level/ServerPlayer.java b/src/main/java/net/minecraft/server/level/ServerPlayer.java +index bee8cc19d7912d2ab1b731c47cf7e31d21d61866..65e6623c2d1a6cf48729f78948fc48e82057114c 100644 +--- a/src/main/java/net/minecraft/server/level/ServerPlayer.java ++++ b/src/main/java/net/minecraft/server/level/ServerPlayer.java +@@ -292,6 +292,50 @@ public class ServerPlayer extends Player { + public @Nullable String clientBrandName = null; // Paper - Brand support + public org.bukkit.event.player.PlayerQuitEvent.QuitReason quitReason = null; // Paper - Add API for quit reason; there are a lot of changes to do if we change all methods leading to the event + ++ // Paper start - replace player chunk loader ++ private final java.util.concurrent.atomic.AtomicReference<io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.ViewDistances> viewDistances = new java.util.concurrent.atomic.AtomicReference<>(new io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.ViewDistances(-1, -1, -1)); ++ public io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.PlayerChunkLoaderData chunkLoader; ++ ++ public io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.ViewDistances getViewDistances() { ++ return this.viewDistances.get(); ++ } ++ ++ private void updateViewDistance(final java.util.function.Function<io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.ViewDistances, io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.ViewDistances> update) { ++ for (io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.ViewDistances curr = this.viewDistances.get();;) { ++ if (this.viewDistances.compareAndSet(curr, update.apply(curr))) { ++ return; ++ } ++ } ++ } ++ ++ public void setTickViewDistance(final int distance) { ++ if ((distance < io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.MIN_VIEW_DISTANCE || distance > io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.MAX_VIEW_DISTANCE)) { ++ throw new IllegalArgumentException("Tick view distance must be a number between " + io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.MIN_VIEW_DISTANCE + " and " + (io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.MAX_VIEW_DISTANCE) + ", got: " + distance); ++ } ++ this.updateViewDistance((input) -> { ++ return input.setTickViewDistance(distance); ++ }); ++ } ++ ++ public void setLoadViewDistance(final int distance) { ++ if (distance != -1 && (distance < io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.MIN_VIEW_DISTANCE || distance > io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.MAX_VIEW_DISTANCE + 1)) { ++ throw new IllegalArgumentException("Load view distance must be a number between " + io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.MIN_VIEW_DISTANCE + " and " + (io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.MAX_VIEW_DISTANCE + 1) + " or -1, got: " + distance); ++ } ++ this.updateViewDistance((input) -> { ++ return input.setLoadViewDistance(distance); ++ }); ++ } ++ ++ public void setSendViewDistance(final int distance) { ++ if (distance != -1 && (distance < io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.MIN_VIEW_DISTANCE || distance > io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.MAX_VIEW_DISTANCE + 1)) { ++ throw new IllegalArgumentException("Send view distance must be a number between " + io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.MIN_VIEW_DISTANCE + " and " + (io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.MAX_VIEW_DISTANCE + 1) + " or -1, got: " + distance); ++ } ++ this.updateViewDistance((input) -> { ++ return input.setSendViewDistance(distance); ++ }); ++ } ++ // Paper end - replace player chunk loader ++ + public ServerPlayer(MinecraftServer server, ServerLevel world, GameProfile profile, ClientInformation clientOptions) { + super(world, world.getSharedSpawnPos(), world.getSharedSpawnAngle(), profile); + this.chatVisibility = ChatVisiblity.FULL; +diff --git a/src/main/java/net/minecraft/server/level/ThreadedLevelLightEngine.java b/src/main/java/net/minecraft/server/level/ThreadedLevelLightEngine.java +index f206df06a7d8895175db31d4a840d7467ffe826f..8ef22f8f0d6da49247a90152e5cfa9ffc7f596a4 100644 +--- a/src/main/java/net/minecraft/server/level/ThreadedLevelLightEngine.java ++++ b/src/main/java/net/minecraft/server/level/ThreadedLevelLightEngine.java +@@ -37,15 +37,12 @@ import net.minecraft.world.level.chunk.status.ChunkStatus; + public class ThreadedLevelLightEngine extends LevelLightEngine implements AutoCloseable { + public static final int DEFAULT_BATCH_SIZE = 1000; + private static final Logger LOGGER = LogUtils.getLogger(); +- private final ProcessorMailbox<Runnable> taskMailbox; +- private final ObjectList<Pair<ThreadedLevelLightEngine.TaskType, Runnable>> lightTasks = new ObjectArrayList<>(); ++ // Paper - rewrite chunk system + private final ChunkMap chunkMap; +- private final ProcessorHandle<ChunkTaskPriorityQueueSorter.Message<Runnable>> sorterMailbox; +- private final int taskPerBatch = 1000; +- private final AtomicBoolean scheduled = new AtomicBoolean(); ++ // Paper - rewrite chunk system + + // Paper start - replace light engine impl +- protected final ca.spottedleaf.starlight.common.light.StarLightInterface theLightEngine; ++ public final ca.spottedleaf.starlight.common.light.StarLightInterface theLightEngine; + public final boolean hasBlockLight; + public final boolean hasSkyLight; + // Paper end - replace light engine impl +@@ -59,8 +56,7 @@ public class ThreadedLevelLightEngine extends LevelLightEngine implements AutoCl + ) { + super(chunkProvider, false, false); // Paper - destroy vanilla light engine state + this.chunkMap = chunkStorage; +- this.sorterMailbox = executor; +- this.taskMailbox = processor; ++ // Paper - rewrite chunk system + // Paper start - replace light engine impl + this.hasBlockLight = true; + this.hasSkyLight = hasBlockLight; // Nice variable name. +@@ -104,7 +100,7 @@ public class ThreadedLevelLightEngine extends LevelLightEngine implements AutoCl + ++totalChunks; + } + +- this.taskMailbox.tell(() -> { ++ this.chunkMap.level.chunkTaskScheduler.radiusAwareScheduler.queueInfiniteRadiusTask(() -> { // Paper - rewrite chunk system + this.theLightEngine.relightChunks(chunks, (ChunkPos chunkPos) -> { + chunkLightCallback.accept(chunkPos); + ((java.util.concurrent.Executor)((ServerLevel)this.theLightEngine.getWorld()).getChunkSource().mainThreadProcessor).execute(() -> { +@@ -121,7 +117,7 @@ public class ThreadedLevelLightEngine extends LevelLightEngine implements AutoCl + private final Long2IntOpenHashMap chunksBeingWorkedOn = new Long2IntOpenHashMap(); + + private void queueTaskForSection(final int chunkX, final int chunkY, final int chunkZ, +- final Supplier<ca.spottedleaf.starlight.common.light.StarLightInterface.LightQueue.ChunkTasks> runnable) { ++ final Supplier<io.papermc.paper.chunk.system.light.LightQueue.ChunkTasks> runnable) { // Paper - rewrite chunk system + final ServerLevel world = (ServerLevel)this.theLightEngine.getWorld(); + + final ChunkAccess center = this.theLightEngine.getAnyChunkNow(chunkX, chunkZ); +@@ -148,7 +144,7 @@ public class ThreadedLevelLightEngine extends LevelLightEngine implements AutoCl + + final long key = CoordinateUtils.getChunkKey(chunkX, chunkZ); + +- final ca.spottedleaf.starlight.common.light.StarLightInterface.LightQueue.ChunkTasks updateFuture = runnable.get(); ++ final io.papermc.paper.chunk.system.light.LightQueue.ChunkTasks updateFuture = runnable.get(); // Paper - rewrite chunk system + + if (updateFuture == null) { + // not scheduled +@@ -285,16 +281,11 @@ public class ThreadedLevelLightEngine extends LevelLightEngine implements AutoCl + } + + private void addTask(int x, int z, ThreadedLevelLightEngine.TaskType stage, Runnable task) { +- this.addTask(x, z, this.chunkMap.getChunkQueueLevel(ChunkPos.asLong(x, z)), stage, task); ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + private void addTask(int x, int z, IntSupplier completedLevelSupplier, ThreadedLevelLightEngine.TaskType stage, Runnable task) { +- this.sorterMailbox.tell(ChunkTaskPriorityQueueSorter.message(() -> { +- this.lightTasks.add(Pair.of(stage, task)); +- if (this.lightTasks.size() >= 1000) { +- this.runUpdate(); +- } +- }, ChunkPos.asLong(x, z), completedLevelSupplier)); ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + @Override +@@ -327,83 +318,15 @@ public class ThreadedLevelLightEngine extends LevelLightEngine implements AutoCl + } + + public CompletableFuture<ChunkAccess> lightChunk(ChunkAccess chunk, boolean excludeBlocks) { +- // Paper start - replace light engine impl +- if (true) { +- boolean lit = excludeBlocks; +- final ChunkPos chunkPos = chunk.getPos(); +- +- return CompletableFuture.supplyAsync(() -> { +- final Boolean[] emptySections = StarLightEngine.getEmptySectionsForChunk(chunk); +- if (!lit) { +- chunk.setLightCorrect(false); +- this.theLightEngine.lightChunk(chunk, emptySections); +- chunk.setLightCorrect(true); +- } else { +- this.theLightEngine.forceLoadInChunk(chunk, emptySections); +- // can't really force the chunk to be edged checked, as we need neighbouring chunks - but we don't have +- // them, so if it's not loaded then i guess we can't do edge checks. later loads of the chunk should +- // catch what we miss here. +- this.theLightEngine.checkChunkEdges(chunkPos.x, chunkPos.z); +- } +- +- this.chunkMap.releaseLightTicket(chunkPos); +- return chunk; +- }, (runnable) -> { +- this.theLightEngine.scheduleChunkLight(chunkPos, runnable); +- this.tryScheduleUpdate(); +- }).whenComplete((final ChunkAccess c, final Throwable throwable) -> { +- if (throwable != null) { +- LOGGER.error("Failed to light chunk " + chunkPos, throwable); +- } +- }); +- } +- // Paper end - replace light engine impl +- ChunkPos chunkPos = chunk.getPos(); +- chunk.setLightCorrect(false); +- this.addTask(chunkPos.x, chunkPos.z, ThreadedLevelLightEngine.TaskType.PRE_UPDATE, Util.name(() -> { +- if (!excludeBlocks) { +- super.propagateLightSources(chunkPos); +- } +- }, () -> "lightChunk " + chunkPos + " " + excludeBlocks)); +- return CompletableFuture.supplyAsync(() -> { +- chunk.setLightCorrect(true); +- this.chunkMap.releaseLightTicket(chunkPos); +- return chunk; +- }, task -> this.addTask(chunkPos.x, chunkPos.z, ThreadedLevelLightEngine.TaskType.POST_UPDATE, task)); ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + public void tryScheduleUpdate() { +- if (this.hasLightWork() && this.scheduled.compareAndSet(false, true)) { // Paper // Paper - rewrite light engine +- this.taskMailbox.tell(() -> { +- this.runUpdate(); +- this.scheduled.set(false); +- }); +- } ++ // Paper - rewrite chunk system + } + + private void runUpdate() { +- int i = Math.min(this.lightTasks.size(), 1000); +- ObjectListIterator<Pair<ThreadedLevelLightEngine.TaskType, Runnable>> objectListIterator = this.lightTasks.iterator(); +- +- int j; +- for (j = 0; objectListIterator.hasNext() && j < i; j++) { +- Pair<ThreadedLevelLightEngine.TaskType, Runnable> pair = objectListIterator.next(); +- if (pair.getFirst() == ThreadedLevelLightEngine.TaskType.PRE_UPDATE) { +- pair.getSecond().run(); +- } +- } +- +- objectListIterator.back(j); +- this.theLightEngine.propagateChanges(); // Paper - rewrite light engine +- +- for (int var5 = 0; objectListIterator.hasNext() && var5 < i; var5++) { +- Pair<ThreadedLevelLightEngine.TaskType, Runnable> pair2 = objectListIterator.next(); +- if (pair2.getFirst() == ThreadedLevelLightEngine.TaskType.POST_UPDATE) { +- pair2.getSecond().run(); +- } +- +- objectListIterator.remove(); +- } ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + public CompletableFuture<?> waitForPendingTasks(int x, int z) { +diff --git a/src/main/java/net/minecraft/server/level/Ticket.java b/src/main/java/net/minecraft/server/level/Ticket.java +index eba83b085435150e5954fd5d41dda9ce1d0601ad..e97329f867de2acbdd666925ba5d2aafa7a90574 100644 +--- a/src/main/java/net/minecraft/server/level/Ticket.java ++++ b/src/main/java/net/minecraft/server/level/Ticket.java +@@ -6,9 +6,12 @@ public final class Ticket<T> implements Comparable<Ticket<?>> { + private final TicketType<T> type; + private final int ticketLevel; + public final T key; +- private long createdTick; ++ // Paper start - rewrite chunk system ++ public long removeDelay; + +- protected Ticket(TicketType<T> type, int level, T argument) { ++ public Ticket(TicketType<T> type, int level, T argument, long removeDelay) { ++ this.removeDelay = removeDelay; ++ // Paper end - rewrite chunk system + this.type = type; + this.ticketLevel = level; + this.key = argument; +@@ -41,7 +44,7 @@ public final class Ticket<T> implements Comparable<Ticket<?>> { + + @Override + public String toString() { +- return "Ticket[" + this.type + " " + this.ticketLevel + " (" + this.key + ")] at " + this.createdTick; ++ return "Ticket[" + this.type + " " + this.ticketLevel + " (" + this.key + ")] to die in " + this.removeDelay; // Paper - rewrite chunk system + } + + public TicketType<T> getType() { +@@ -53,11 +56,10 @@ public final class Ticket<T> implements Comparable<Ticket<?>> { + } + + protected void setCreatedTick(long tickCreated) { +- this.createdTick = tickCreated; ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + protected boolean timedOut(long currentTick) { +- long l = this.type.timeout(); +- return l != 0L && currentTick - this.createdTick > l; ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + } +diff --git a/src/main/java/net/minecraft/server/level/TicketType.java b/src/main/java/net/minecraft/server/level/TicketType.java +index 6051e5f272838ef23276a90e21c2fc821ca155d1..658e63ebde81dc14c8ab5850fb246dc0aab25dea 100644 +--- a/src/main/java/net/minecraft/server/level/TicketType.java ++++ b/src/main/java/net/minecraft/server/level/TicketType.java +@@ -8,6 +8,7 @@ import net.minecraft.world.level.ChunkPos; + + public class TicketType<T> { + public static final TicketType<Long> FUTURE_AWAIT = create("future_await", Long::compareTo); // Paper ++ public static final TicketType<Long> ASYNC_LOAD = create("async_load", Long::compareTo); // Paper + + private final String name; + private final Comparator<T> comparator; +@@ -27,6 +28,15 @@ public class TicketType<T> { + public static final TicketType<Unit> PLUGIN = TicketType.create("plugin", (a, b) -> 0); // CraftBukkit + public static final TicketType<org.bukkit.plugin.Plugin> PLUGIN_TICKET = TicketType.create("plugin_ticket", (plugin1, plugin2) -> plugin1.getClass().getName().compareTo(plugin2.getClass().getName())); // CraftBukkit + public static final TicketType<Long> CHUNK_RELIGHT = create("light_update", Long::compareTo); // Paper - ensure chunks stay loaded for lighting ++ // Paper start - rewrite chunk system ++ public static final TicketType<Long> CHUNK_LOAD = create("chunk_load", Long::compareTo); ++ public static final TicketType<Long> STATUS_UPGRADE = create("status_upgrade", Long::compareTo); ++ public static final TicketType<Long> ENTITY_LOAD = create("entity_load", Long::compareTo); ++ public static final TicketType<Long> POI_LOAD = create("poi_load", Long::compareTo); ++ public static final TicketType<Unit> UNLOAD_COOLDOWN = create("unload_cooldown", (u1, u2) -> 0, 5 * 20); ++ public static final TicketType<Long> NON_FULL_SYNC_LOAD = create("non_full_sync_load", Long::compareTo); ++ public static final TicketType<ChunkPos> DELAY_UNLOAD = create("delay_unload", Comparator.comparingLong(ChunkPos::toLong), 1); ++ // Paper end - rewrite chunk system + + public static <T> TicketType<T> create(String name, Comparator<T> argumentComparator) { + return new TicketType<>(name, argumentComparator, 0L); +diff --git a/src/main/java/net/minecraft/server/level/WorldGenRegion.java b/src/main/java/net/minecraft/server/level/WorldGenRegion.java +index ca4c8e256047a4af45811c3e772b5a959e2ae941..1351423a12c19a01f602a202832372a399e6a867 100644 +--- a/src/main/java/net/minecraft/server/level/WorldGenRegion.java ++++ b/src/main/java/net/minecraft/server/level/WorldGenRegion.java +@@ -544,4 +544,21 @@ public class WorldGenRegion implements WorldGenLevel { + public long nextSubTickCount() { + return this.subTickCount.getAndIncrement(); + } ++ ++ // Paper start ++ // No-op, this class doesn't provide entity access ++ @Override ++ public List<Entity> getHardCollidingEntities(Entity except, AABB box, Predicate<? super Entity> predicate) { ++ return Collections.emptyList(); ++ } ++ ++ @Override ++ public void getEntities(Entity except, AABB box, Predicate<? super Entity> predicate, List<Entity> into) {} ++ ++ @Override ++ public void getHardCollidingEntities(Entity except, AABB box, Predicate<? super Entity> predicate, List<Entity> into) {} ++ ++ @Override ++ public <T> void getEntitiesByClass(Class<? extends T> clazz, Entity except, AABB box, List<? super T> into, Predicate<? super T> predicate) {} ++ // Paper end + } +diff --git a/src/main/java/net/minecraft/server/network/PlayerChunkSender.java b/src/main/java/net/minecraft/server/network/PlayerChunkSender.java +index c502d9b85eb68b277ae17dfea34e0475f0156647..27d0f1ed58948039004f8f1eba2f7f9609fdeec0 100644 +--- a/src/main/java/net/minecraft/server/network/PlayerChunkSender.java ++++ b/src/main/java/net/minecraft/server/network/PlayerChunkSender.java +@@ -43,16 +43,23 @@ public class PlayerChunkSender { + + public void dropChunk(ServerPlayer player, ChunkPos pos) { + if (!this.pendingChunks.remove(pos.toLong()) && player.isAlive()) { ++ // Paper start - rewrite player chunk loader ++ dropChunkStatic(player, pos); ++ } ++ } ++ public static void dropChunkStatic(ServerPlayer player, ChunkPos pos) { ++ player.serverLevel().chunkSource.chunkMap.getVisibleChunkIfPresent(pos.toLong()).removePlayer(player); + player.connection.send(new ClientboundForgetLevelChunkPacket(pos)); + // Paper start - PlayerChunkUnloadEvent + if (io.papermc.paper.event.packet.PlayerChunkUnloadEvent.getHandlerList().getRegisteredListeners().length > 0) { + new io.papermc.paper.event.packet.PlayerChunkUnloadEvent(player.getBukkitEntity().getWorld().getChunkAt(pos.longKey), player.getBukkitEntity()).callEvent(); + } + // Paper end - PlayerChunkUnloadEvent +- } + } ++ // Paper end - rewrite player chunk loader + + public void sendNextChunks(ServerPlayer player) { ++ if (true) return; // Paper - rewrite player chunk loader + if (this.unacknowledgedBatches < this.maxUnacknowledgedBatches) { + float f = Math.max(1.0F, this.desiredChunksPerTick); + this.batchQuota = Math.min(this.batchQuota + this.desiredChunksPerTick, f); +@@ -78,7 +85,8 @@ public class PlayerChunkSender { + } + } + +- private static void sendChunk(ServerGamePacketListenerImpl handler, ServerLevel world, LevelChunk chunk) { ++ public static void sendChunk(ServerGamePacketListenerImpl handler, ServerLevel world, LevelChunk chunk) { // Paper - rewrite chunk loader - public ++ handler.player.serverLevel().chunkSource.chunkMap.getVisibleChunkIfPresent(chunk.getPos().toLong()).addPlayer(handler.player); + handler.send(new ClientboundLevelChunkWithLightPacket(chunk, world.getLightEngine(), null, null)); + // Paper start - PlayerChunkLoadEvent + if (io.papermc.paper.event.packet.PlayerChunkLoadEvent.getHandlerList().getRegisteredListeners().length > 0) { +@@ -118,6 +126,7 @@ public class PlayerChunkSender { + } + + public void onChunkBatchReceivedByClient(float desiredBatchSize) { ++ if (true) return; // Paper - rewrite player chunk loader + this.unacknowledgedBatches--; + this.desiredChunksPerTick = Double.isNaN((double)desiredBatchSize) ? 0.01F : Mth.clamp(desiredBatchSize, 0.01F, 64.0F); + if (this.unacknowledgedBatches == 0) { +diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java +index 0aa28caa1254137c0bae8e213bd08c9a654f5335..c4b4e5f5c9366b241686e881cda34568a57b4877 100644 +--- a/src/main/java/net/minecraft/server/players/PlayerList.java ++++ b/src/main/java/net/minecraft/server/players/PlayerList.java +@@ -296,7 +296,7 @@ public abstract class PlayerList { + boolean flag2 = gamerules.getBoolean(GameRules.RULE_LIMITED_CRAFTING); + + // Spigot - view distance +- playerconnection.send(new ClientboundLoginPacket(player.getId(), worlddata.isHardcore(), this.server.levelKeys(), this.getMaxPlayers(), worldserver1.spigotConfig.viewDistance, worldserver1.spigotConfig.simulationDistance, flag1, !flag, flag2, player.createCommonSpawnInfo(worldserver1), this.server.enforceSecureProfile())); ++ playerconnection.send(new ClientboundLoginPacket(player.getId(), worlddata.isHardcore(), this.server.levelKeys(), this.getMaxPlayers(), worldserver1.getWorld().getSendViewDistance(), worldserver1.getWorld().getSimulationDistance(), flag1, !flag, flag2, player.createCommonSpawnInfo(worldserver1), this.server.enforceSecureProfile())); // Paper - replace old player chunk management + player.getBukkitEntity().sendSupportedChannels(); // CraftBukkit + playerconnection.send(new ClientboundChangeDifficultyPacket(worlddata.getDifficulty(), worlddata.isDifficultyLocked())); + playerconnection.send(new ClientboundPlayerAbilitiesPacket(player.getAbilities())); +@@ -943,8 +943,8 @@ public abstract class PlayerList { + LevelData worlddata = worldserver2.getLevelData(); + + entityplayer1.connection.send(new ClientboundRespawnPacket(entityplayer1.createCommonSpawnInfo(worldserver2), (byte) i)); +- entityplayer1.connection.send(new ClientboundSetChunkCacheRadiusPacket(worldserver1.spigotConfig.viewDistance)); // Spigot +- entityplayer1.connection.send(new ClientboundSetSimulationDistancePacket(worldserver1.spigotConfig.simulationDistance)); // Spigot ++ entityplayer1.connection.send(new ClientboundSetChunkCacheRadiusPacket(worldserver1.getWorld().getSendViewDistance())); // Spigot // Paper - replace old player chunk management ++ entityplayer1.connection.send(new ClientboundSetSimulationDistancePacket(worldserver1.getWorld().getSimulationDistance())); // Spigot // Paper - replace old player chunk management + entityplayer1.connection.teleport(CraftLocation.toBukkit(entityplayer1.position(), worldserver2.getWorld(), entityplayer1.getYRot(), entityplayer1.getXRot())); // CraftBukkit + entityplayer1.connection.send(new ClientboundSetDefaultSpawnPositionPacket(worldserver1.getSharedSpawnPos(), worldserver1.getSharedSpawnAngle())); + entityplayer1.connection.send(new ClientboundChangeDifficultyPacket(worlddata.getDifficulty(), worlddata.isDifficultyLocked())); +@@ -1496,7 +1496,7 @@ public abstract class PlayerList { + + public void setViewDistance(int viewDistance) { + this.viewDistance = viewDistance; +- this.broadcastAll(new ClientboundSetChunkCacheRadiusPacket(viewDistance)); ++ //this.broadcastAll(new ClientboundSetChunkCacheRadiusPacket(viewDistance)); // Paper - move into setViewDistance + Iterator iterator = this.server.getAllLevels().iterator(); + + while (iterator.hasNext()) { +@@ -1511,7 +1511,7 @@ public abstract class PlayerList { + + public void setSimulationDistance(int simulationDistance) { + this.simulationDistance = simulationDistance; +- this.broadcastAll(new ClientboundSetSimulationDistancePacket(simulationDistance)); ++ //this.broadcastAll(new ClientboundSetSimulationDistancePacket(simulationDistance)); // Paper - handled by playerchunkloader + Iterator iterator = this.server.getAllLevels().iterator(); + + while (iterator.hasNext()) { +diff --git a/src/main/java/net/minecraft/util/SortedArraySet.java b/src/main/java/net/minecraft/util/SortedArraySet.java +index ea72dcb064a35bc6245bc5c94d592efedd8faf41..0793dfe47e68a2b48b010aad5b12dcfa1701293a 100644 +--- a/src/main/java/net/minecraft/util/SortedArraySet.java ++++ b/src/main/java/net/minecraft/util/SortedArraySet.java +@@ -14,6 +14,14 @@ public class SortedArraySet<T> extends AbstractSet<T> { + T[] contents; + int size; + ++ // Paper start - rewrite chunk system ++ public SortedArraySet(final SortedArraySet<T> other) { ++ this.comparator = other.comparator; ++ this.size = other.size; ++ this.contents = Arrays.copyOf(other.contents, this.size); ++ } ++ // Paper end - rewrite chunk system ++ + private SortedArraySet(int initialCapacity, Comparator<T> comparator) { + this.comparator = comparator; + if (initialCapacity < 0) { +@@ -22,6 +30,41 @@ public class SortedArraySet<T> extends AbstractSet<T> { + this.contents = (T[])castRawArray(new Object[initialCapacity]); + } + } ++ // Paper start - optimise removeIf ++ @Override ++ public boolean removeIf(java.util.function.Predicate<? super T> filter) { ++ // prev. impl used an iterator, which could be n^2 and creates garbage ++ int i = 0, len = this.size; ++ T[] backingArray = this.contents; ++ ++ for (;;) { ++ if (i >= len) { ++ return false; ++ } ++ if (!filter.test(backingArray[i])) { ++ ++i; ++ continue; ++ } ++ break; ++ } ++ ++ // we only want to write back to backingArray if we really need to ++ ++ int lastIndex = i; // this is where new elements are shifted to ++ ++ for (; i < len; ++i) { ++ T curr = backingArray[i]; ++ if (!filter.test(curr)) { // if test throws we're screwed ++ backingArray[lastIndex++] = curr; ++ } ++ } ++ ++ // cleanup end ++ Arrays.fill(backingArray, lastIndex, len, null); ++ this.size = lastIndex; ++ return true; ++ } ++ // Paper end - optimise removeIf + + public static <T extends Comparable<T>> SortedArraySet<T> create() { + return create(10); +@@ -110,6 +153,31 @@ public class SortedArraySet<T> extends AbstractSet<T> { + } + } + ++ // Paper start - rewrite chunk system ++ public T replace(T object) { ++ int i = this.findIndex(object); ++ if (i >= 0) { ++ T old = this.contents[i]; ++ this.contents[i] = object; ++ return old; ++ } else { ++ this.addInternal(object, getInsertionPosition(i)); ++ return object; ++ } ++ } ++ ++ public T removeAndGet(T object) { ++ int i = this.findIndex(object); ++ if (i >= 0) { ++ final T ret = this.contents[i]; ++ this.removeInternal(i); ++ return ret; ++ } else { ++ return null; ++ } ++ } ++ // Paper end - rewrite chunk system ++ + @Override + public boolean remove(Object object) { + int i = this.findIndex((T)object); +diff --git a/src/main/java/net/minecraft/util/worldupdate/WorldUpgrader.java b/src/main/java/net/minecraft/util/worldupdate/WorldUpgrader.java +index 7984f17cd9c4cef8100909b6c33b3144c8096fcf..639f72618a7c22fa94effa9d0406b97fffc64cb5 100644 +--- a/src/main/java/net/minecraft/util/worldupdate/WorldUpgrader.java ++++ b/src/main/java/net/minecraft/util/worldupdate/WorldUpgrader.java +@@ -227,7 +227,13 @@ public class WorldUpgrader { + this.previousWriteFuture.join(); + } + ++ // Paper start - async chunk io ++ try { + this.previousWriteFuture = storage.write(chunkPos, nbttagcompound1); ++ } catch (final IOException e) { ++ com.destroystokyo.paper.util.SneakyThrow.sneaky(e); ++ } ++ // Paper end - async chunk io + return true; + } + } +diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java +index 3c1bcf8d1a07b35a8688160c9f05f792451338a3..03840f520624662d4ce3ac9f3065a01c71b5f299 100644 +--- a/src/main/java/net/minecraft/world/entity/Entity.java ++++ b/src/main/java/net/minecraft/world/entity/Entity.java +@@ -482,6 +482,58 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess + } + // Paper end + ++ // Paper start ++ /** ++ * Overriding this field will cause memory leaks. ++ */ ++ private final boolean hardCollides; ++ ++ private static final java.util.Map<Class<? extends Entity>, Boolean> cachedOverrides = java.util.Collections.synchronizedMap(new java.util.WeakHashMap<>()); ++ { ++ /* // Goodbye, broken on reobf... ++ Boolean hardCollides = cachedOverrides.get(this.getClass()); ++ if (hardCollides == null) { ++ try { ++ java.lang.reflect.Method getHardCollisionBoxEntityMethod = Entity.class.getMethod("canCollideWith", Entity.class); ++ java.lang.reflect.Method hasHardCollisionBoxMethod = Entity.class.getMethod("canBeCollidedWith"); ++ if (!this.getClass().getMethod(hasHardCollisionBoxMethod.getName(), hasHardCollisionBoxMethod.getParameterTypes()).equals(hasHardCollisionBoxMethod) ++ || !this.getClass().getMethod(getHardCollisionBoxEntityMethod.getName(), getHardCollisionBoxEntityMethod.getParameterTypes()).equals(getHardCollisionBoxEntityMethod)) { ++ hardCollides = Boolean.TRUE; ++ } else { ++ hardCollides = Boolean.FALSE; ++ } ++ cachedOverrides.put(this.getClass(), hardCollides); ++ } ++ catch (ThreadDeath thr) { throw thr; } ++ catch (Throwable thr) { ++ // shouldn't happen, just explode ++ throw new RuntimeException(thr); ++ } ++ } */ ++ this.hardCollides = this instanceof Boat ++ || this instanceof net.minecraft.world.entity.monster.Shulker ++ || this instanceof net.minecraft.world.entity.vehicle.AbstractMinecart ++ || this.shouldHardCollide(); ++ } ++ ++ // plugins can override ++ protected boolean shouldHardCollide() { ++ return false; ++ } ++ ++ public final boolean hardCollides() { ++ return this.hardCollides; ++ } ++ ++ public net.minecraft.server.level.FullChunkStatus chunkStatus; ++ ++ public int sectionX = Integer.MIN_VALUE; ++ public int sectionY = Integer.MIN_VALUE; ++ public int sectionZ = Integer.MIN_VALUE; ++ ++ public boolean updatingSectionStatus = false; ++ // Paper end ++ + public Entity(EntityType<?> type, Level world) { + this.id = Entity.ENTITY_COUNTER.incrementAndGet(); + this.passengers = ImmutableList.of(); +@@ -2608,11 +2660,11 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess + return InteractionResult.PASS; + } + +- public boolean canCollideWith(Entity other) { ++ public boolean canCollideWith(Entity other) { // Paper - diff on change, hard colliding entities override this - TODO CHECK ON UPDATE - AbstractMinecart/Boat override + return other.canBeCollidedWith() && !this.isPassengerOfSameVehicle(other); + } + +- public boolean canBeCollidedWith() { ++ public boolean canBeCollidedWith() { // Paper - diff on change, hard colliding entities override this TODO CHECK ON UPDATE - Boat/Shulker override + return false; + } + +@@ -4037,6 +4089,13 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess + }).count(); + } + ++ // Paper start - rewrite chunk system ++ public boolean hasAnyPlayerPassengers() { ++ // copied from below ++ if (this.passengers.isEmpty()) { return false; } ++ return this.getIndirectPassengersStream().anyMatch((entity) -> entity instanceof Player); ++ } ++ // Paper end - rewrite chunk system + public boolean hasExactlyOnePlayerPassenger() { + if (this.passengers.isEmpty()) { return false; } // Paper - Optimize indirect passenger iteration + return this.countPlayerPassengers() == 1; +@@ -4387,6 +4446,12 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess + return; + } + // Paper end - Block invalid positions and bounding box ++ // Paper start - rewrite chunk system ++ if (this.updatingSectionStatus) { ++ LOGGER.error("Refusing to update position for entity {} to position {} since it is processing a section status update", this, new Vec3(x, y, z), new Throwable()); ++ return; ++ } ++ // Paper end - rewrite chunk system + // Paper start - Fix MC-4 + if (this instanceof ItemEntity) { + if (io.papermc.paper.configuration.GlobalConfiguration.get().misc.fixEntityPositionDesync) { +@@ -4514,6 +4579,13 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess + + @Override + public final void setRemoved(Entity.RemovalReason entity_removalreason, EntityRemoveEvent.Cause cause) { ++ // Paper start - rewrite chunk system ++ io.papermc.paper.util.TickThread.ensureTickThread(this, "Cannot remove entity off-main"); ++ if (!((ServerLevel)this.level).getEntityLookup().canRemoveEntity(this)) { ++ LOGGER.warn("Entity " + this + " is currently prevented from being removed from the world since it is processing section status updates", new Throwable()); ++ return; ++ } ++ // Paper end - rewrite chunk system + CraftEventFactory.callEntityRemoveEvent(this, cause); + // CraftBukkit end + final boolean alreadyRemoved = this.removalReason != null; // Paper - Folia schedulers +@@ -4525,7 +4597,7 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess + this.stopRiding(); + } + +- this.getPassengers().forEach(Entity::stopRiding); ++ if (entity_removalreason != RemovalReason.UNLOADED_TO_CHUNK) this.getPassengers().forEach(Entity::stopRiding); // Paper - chunk system - don't adjust passenger state when unloading, it's just not safe (and messes with our logic in entity chunk unload) + this.levelCallback.onRemove(entity_removalreason); + // Paper start - Folia schedulers + if (!(this instanceof ServerPlayer) && entity_removalreason != RemovalReason.CHANGED_DIMENSION && !alreadyRemoved) { +@@ -4556,7 +4628,7 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess + + @Override + public boolean shouldBeSaved() { +- return this.removalReason != null && !this.removalReason.shouldSave() ? false : (this.isPassenger() ? false : !this.isVehicle() || !this.hasExactlyOnePlayerPassenger()); ++ return this.removalReason != null && !this.removalReason.shouldSave() ? false : (this.isPassenger() ? false : !this.isVehicle() || !this.hasAnyPlayerPassengers()); // Paper - rewrite chunk system - it should check if the entity has ANY player passengers + } + + @Override +diff --git a/src/main/java/net/minecraft/world/entity/ai/village/poi/PoiManager.java b/src/main/java/net/minecraft/world/entity/ai/village/poi/PoiManager.java +index 71d8909f35a22256406a2232d21adfd7d94dc3a5..7b52b0507cbda76aee1db954641f397bef51f94d 100644 +--- a/src/main/java/net/minecraft/world/entity/ai/village/poi/PoiManager.java ++++ b/src/main/java/net/minecraft/world/entity/ai/village/poi/PoiManager.java +@@ -40,20 +40,40 @@ import net.minecraft.world.level.chunk.storage.SimpleRegionStorage; + public class PoiManager extends SectionStorage<PoiSection> { + public static final int MAX_VILLAGE_DISTANCE = 6; + public static final int VILLAGE_SECTION_SIZE = 1; +- private final PoiManager.DistanceTracker distanceTracker; +- private final LongSet loadedChunks = new LongOpenHashSet(); ++ // Paper start - rewrite chunk system ++ // the vanilla tracker needs to be replaced because it does not support level removes ++ public final net.minecraft.server.level.ServerLevel world; ++ private final io.papermc.paper.util.misc.Delayed26WayDistancePropagator3D villageDistanceTracker = new io.papermc.paper.util.misc.Delayed26WayDistancePropagator3D(); ++ static final int POI_DATA_SOURCE = 7; ++ public static int convertBetweenLevels(final int level) { ++ return POI_DATA_SOURCE - level; ++ } ++ ++ protected void updateDistanceTracking(long section) { ++ if (this.isVillageCenter(section)) { ++ this.villageDistanceTracker.setSource(section, POI_DATA_SOURCE); ++ } else { ++ this.villageDistanceTracker.removeSource(section); ++ } ++ } ++ // Paper end - rewrite chunk system + + public PoiManager( + RegionStorageInfo storageKey, Path directory, DataFixer dataFixer, boolean dsync, RegistryAccess registryManager, LevelHeightAccessor world + ) { + super( ++ // Paper start ++ storageKey, ++ directory, ++ dsync, ++ // Paper end + new SimpleRegionStorage(storageKey, directory, dataFixer, dsync, DataFixTypes.POI_CHUNK), + PoiSection::codec, + PoiSection::new, + registryManager, + world + ); +- this.distanceTracker = new PoiManager.DistanceTracker(); ++ this.world = (net.minecraft.server.level.ServerLevel)world; // Paper - rewrite chunk system + } + + public void add(BlockPos pos, Holder<PoiType> type) { +@@ -187,8 +207,8 @@ public class PoiManager extends SectionStorage<PoiSection> { + } + + public int sectionsToVillage(SectionPos pos) { +- this.distanceTracker.runAllUpdates(); +- return this.distanceTracker.getLevel(pos.asLong()); ++ this.villageDistanceTracker.propagateUpdates(); // Paper - replace distance tracking util ++ return convertBetweenLevels(this.villageDistanceTracker.getLevel(io.papermc.paper.util.CoordinateUtils.getChunkSectionKey(pos))); // Paper - replace distance tracking util + } + + boolean isVillageCenter(long pos) { +@@ -202,20 +222,117 @@ public class PoiManager extends SectionStorage<PoiSection> { + + @Override + public void tick(BooleanSupplier shouldKeepTicking) { +- super.tick(shouldKeepTicking); +- this.distanceTracker.runAllUpdates(); ++ this.villageDistanceTracker.propagateUpdates(); // Paper - rewrite chunk system + } + + @Override +- protected void setDirty(long pos) { +- super.setDirty(pos); +- this.distanceTracker.update(pos, this.distanceTracker.getLevelFromSource(pos), false); ++ public void setDirty(long pos) { ++ // Paper start - rewrite chunk system ++ int chunkX = io.papermc.paper.util.CoordinateUtils.getChunkSectionX(pos); ++ int chunkZ = io.papermc.paper.util.CoordinateUtils.getChunkSectionZ(pos); ++ io.papermc.paper.chunk.system.scheduling.ChunkHolderManager manager = this.world.chunkTaskScheduler.chunkHolderManager; ++ io.papermc.paper.chunk.system.poi.PoiChunk chunk = manager.getPoiChunkIfLoaded(chunkX, chunkZ, false); ++ if (chunk != null) { ++ chunk.setDirty(true); ++ } ++ this.updateDistanceTracking(pos); ++ // Paper end - rewrite chunk system + } + + @Override + protected void onSectionLoad(long pos) { +- this.distanceTracker.update(pos, this.distanceTracker.getLevelFromSource(pos), false); ++ this.updateDistanceTracking(pos); // Paper - move to new distance tracking util ++ } ++ ++ // Paper start - rewrite chunk system ++ @Override ++ public Optional<PoiSection> get(long pos) { ++ int chunkX = io.papermc.paper.util.CoordinateUtils.getChunkSectionX(pos); ++ int chunkY = io.papermc.paper.util.CoordinateUtils.getChunkSectionY(pos); ++ int chunkZ = io.papermc.paper.util.CoordinateUtils.getChunkSectionZ(pos); ++ ++ io.papermc.paper.util.TickThread.ensureTickThread(this.world, chunkX, chunkZ, "Accessing poi chunk off-main"); ++ ++ io.papermc.paper.chunk.system.scheduling.ChunkHolderManager manager = this.world.chunkTaskScheduler.chunkHolderManager; ++ io.papermc.paper.chunk.system.poi.PoiChunk ret = manager.getPoiChunkIfLoaded(chunkX, chunkZ, true); ++ ++ return ret == null ? Optional.empty() : ret.getSectionForVanilla(chunkY); ++ } ++ ++ @Override ++ public Optional<PoiSection> getOrLoad(long pos) { ++ int chunkX = io.papermc.paper.util.CoordinateUtils.getChunkSectionX(pos); ++ int chunkY = io.papermc.paper.util.CoordinateUtils.getChunkSectionY(pos); ++ int chunkZ = io.papermc.paper.util.CoordinateUtils.getChunkSectionZ(pos); ++ ++ io.papermc.paper.util.TickThread.ensureTickThread(this.world, chunkX, chunkZ, "Accessing poi chunk off-main"); ++ ++ io.papermc.paper.chunk.system.scheduling.ChunkHolderManager manager = this.world.chunkTaskScheduler.chunkHolderManager; ++ ++ if (chunkY >= io.papermc.paper.util.WorldUtil.getMinSection(this.world) && ++ chunkY <= io.papermc.paper.util.WorldUtil.getMaxSection(this.world)) { ++ io.papermc.paper.chunk.system.poi.PoiChunk ret = manager.getPoiChunkIfLoaded(chunkX, chunkZ, true); ++ if (ret != null) { ++ return ret.getSectionForVanilla(chunkY); ++ } else { ++ return manager.loadPoiChunk(chunkX, chunkZ).getSectionForVanilla(chunkY); ++ } ++ } ++ // retain vanilla behavior: do not load section if out of bounds! ++ return Optional.empty(); ++ } ++ ++ @Override ++ protected PoiSection getOrCreate(long pos) { ++ int chunkX = io.papermc.paper.util.CoordinateUtils.getChunkSectionX(pos); ++ int chunkY = io.papermc.paper.util.CoordinateUtils.getChunkSectionY(pos); ++ int chunkZ = io.papermc.paper.util.CoordinateUtils.getChunkSectionZ(pos); ++ ++ io.papermc.paper.util.TickThread.ensureTickThread(this.world, chunkX, chunkZ, "Accessing poi chunk off-main"); ++ ++ io.papermc.paper.chunk.system.scheduling.ChunkHolderManager manager = this.world.chunkTaskScheduler.chunkHolderManager; ++ ++ io.papermc.paper.chunk.system.poi.PoiChunk ret = manager.getPoiChunkIfLoaded(chunkX, chunkZ, true); ++ if (ret != null) { ++ return ret.getOrCreateSection(chunkY); ++ } else { ++ return manager.loadPoiChunk(chunkX, chunkZ).getOrCreateSection(chunkY); ++ } ++ } ++ ++ public void onUnload(long coordinate) { // Paper - rewrite chunk system ++ int chunkX = io.papermc.paper.util.MCUtil.getCoordinateX(coordinate); ++ int chunkZ = io.papermc.paper.util.MCUtil.getCoordinateZ(coordinate); ++ io.papermc.paper.util.TickThread.ensureTickThread(this.world, chunkX, chunkZ, "Unloading poi chunk off-main"); ++ for (int section = this.levelHeightAccessor.getMinSection(); section < this.levelHeightAccessor.getMaxSection(); ++section) { ++ long sectionPos = SectionPos.asLong(chunkX, section, chunkZ); ++ this.updateDistanceTracking(sectionPos); ++ } ++ } ++ ++ public void loadInPoiChunk(io.papermc.paper.chunk.system.poi.PoiChunk poiChunk) { ++ int chunkX = poiChunk.chunkX; ++ int chunkZ = poiChunk.chunkZ; ++ io.papermc.paper.util.TickThread.ensureTickThread(this.world, chunkX, chunkZ, "Loading poi chunk off-main"); ++ for (int sectionY = this.levelHeightAccessor.getMinSection(); sectionY < this.levelHeightAccessor.getMaxSection(); ++sectionY) { ++ PoiSection section = poiChunk.getSection(sectionY); ++ if (section != null && !section.isEmpty()) { ++ this.onSectionLoad(SectionPos.asLong(chunkX, sectionY, chunkZ)); ++ } ++ } ++ } ++ ++ public void checkConsistency(net.minecraft.world.level.chunk.ChunkAccess chunk) { ++ int chunkX = chunk.getPos().x; ++ int chunkZ = chunk.getPos().z; ++ int minY = io.papermc.paper.util.WorldUtil.getMinSection(chunk); ++ int maxY = io.papermc.paper.util.WorldUtil.getMaxSection(chunk); ++ LevelChunkSection[] sections = chunk.getSections(); ++ for (int section = minY; section <= maxY; ++section) { ++ this.checkConsistencyWithBlocks(SectionPos.of(chunkX, section, chunkZ), sections[section - minY]); ++ } + } ++ // Paper end - rewrite chunk system + + public void checkConsistencyWithBlocks(SectionPos sectionPos, LevelChunkSection chunkSection) { + Util.ifElse(this.getOrLoad(sectionPos.asLong()), poiSet -> poiSet.refresh(populator -> { +@@ -251,7 +368,7 @@ public class PoiManager extends SectionStorage<PoiSection> { + .map(sectionPos -> Pair.of(sectionPos, this.getOrLoad(sectionPos.asLong()))) + .filter(pair -> !pair.getSecond().map(PoiSection::isValid).orElse(false)) + .map(pair -> pair.getFirst().chunk()) +- .filter(chunkPos -> this.loadedChunks.add(chunkPos.toLong())) ++ // Paper - rewrite chunk system + .forEach(chunkPos -> world.getChunk(chunkPos.x, chunkPos.z, ChunkStatus.EMPTY)); + } + +@@ -265,7 +382,7 @@ public class PoiManager extends SectionStorage<PoiSection> { + + @Override + protected int getLevelFromSource(long id) { +- return PoiManager.this.isVillageCenter(id) ? 0 : 7; ++ return PoiManager.this.isVillageCenter(id) ? 0 : 7; // Paper - rewrite chunk system - diff on change, this specifies the source level to use for distance tracking + } + + @Override +@@ -287,6 +404,35 @@ public class PoiManager extends SectionStorage<PoiSection> { + } + } + ++ // Paper start - Asynchronous chunk io ++ @javax.annotation.Nullable ++ @Override ++ public net.minecraft.nbt.CompoundTag read(ChunkPos chunkcoordintpair) throws java.io.IOException { ++ // Paper start - rewrite chunk system ++ if (!io.papermc.paper.chunk.system.io.RegionFileIOThread.isRegionFileThread()) { ++ return io.papermc.paper.chunk.system.io.RegionFileIOThread.loadData( ++ this.world, chunkcoordintpair.x, chunkcoordintpair.z, io.papermc.paper.chunk.system.io.RegionFileIOThread.RegionFileType.POI_DATA, ++ io.papermc.paper.chunk.system.io.RegionFileIOThread.getIOBlockingPriorityForCurrentThread() ++ ); ++ } ++ // Paper end - rewrite chunk system ++ return super.read(chunkcoordintpair); ++ } ++ ++ @Override ++ public void write(ChunkPos chunkcoordintpair, net.minecraft.nbt.CompoundTag nbttagcompound) throws java.io.IOException { ++ // Paper start - rewrite chunk system ++ if (!io.papermc.paper.chunk.system.io.RegionFileIOThread.isRegionFileThread()) { ++ io.papermc.paper.chunk.system.io.RegionFileIOThread.scheduleSave( ++ this.world, chunkcoordintpair.x, chunkcoordintpair.z, nbttagcompound, ++ io.papermc.paper.chunk.system.io.RegionFileIOThread.RegionFileType.POI_DATA); ++ return; ++ } ++ // Paper end - rewrite chunk system ++ super.write(chunkcoordintpair, nbttagcompound); ++ } ++ // Paper end ++ + public static enum Occupancy { + HAS_SPACE(PoiRecord::hasSpace), + IS_OCCUPIED(PoiRecord::isOccupied), +diff --git a/src/main/java/net/minecraft/world/entity/ai/village/poi/PoiSection.java b/src/main/java/net/minecraft/world/entity/ai/village/poi/PoiSection.java +index 971fb29a2c3dc713cb8ab1d2eed054cc16f9c93c..5b7deae326228e482b218aeebd857a59b7434eaf 100644 +--- a/src/main/java/net/minecraft/world/entity/ai/village/poi/PoiSection.java ++++ b/src/main/java/net/minecraft/world/entity/ai/village/poi/PoiSection.java +@@ -29,6 +29,7 @@ public class PoiSection { + private final Map<Holder<PoiType>, Set<PoiRecord>> byType = Maps.newHashMap(); + private final Runnable setDirty; + private boolean isValid; ++ public final Optional<PoiSection> noAllocateOptional = Optional.of(this); // Paper - rewrite chunk system + + public static Codec<PoiSection> codec(Runnable updateListener) { + return RecordCodecBuilder.<PoiSection>create( +@@ -46,6 +47,12 @@ public class PoiSection { + this(updateListener, true, ImmutableList.of()); + } + ++ // Paper start - isEmpty ++ public boolean isEmpty() { ++ return this.isValid && this.records.isEmpty() && this.byType.isEmpty(); ++ } ++ // Paper end ++ + private PoiSection(Runnable updateListener, boolean valid, List<PoiRecord> pois) { + this.setDirty = updateListener; + this.isValid = valid; +diff --git a/src/main/java/net/minecraft/world/level/EntityGetter.java b/src/main/java/net/minecraft/world/level/EntityGetter.java +index bd20bea7f76a7307f1698fb2dfef37125032d166..9a28912f52824acdc80a62243b136e6f365bf567 100644 +--- a/src/main/java/net/minecraft/world/level/EntityGetter.java ++++ b/src/main/java/net/minecraft/world/level/EntityGetter.java +@@ -19,6 +19,18 @@ import net.minecraft.world.phys.shapes.Shapes; + import net.minecraft.world.phys.shapes.VoxelShape; + + public interface EntityGetter { ++ ++ // Paper start ++ List<Entity> getHardCollidingEntities(Entity except, AABB box, Predicate<? super Entity> predicate); ++ ++ void getEntities(Entity except, AABB box, Predicate<? super Entity> predicate, List<Entity> into); ++ ++ void getHardCollidingEntities(Entity except, AABB box, Predicate<? super Entity> predicate, List<Entity> into); ++ ++ <T> void getEntitiesByClass(Class<? extends T> clazz, Entity except, final AABB box, List<? super T> into, ++ Predicate<? super T> predicate); ++ // Paper end ++ + List<Entity> getEntities(@Nullable Entity except, AABB box, Predicate<? super Entity> predicate); + + <T extends Entity> List<T> getEntities(EntityTypeTest<Entity, T> filter, AABB box, Predicate<? super T> predicate); +diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java +index 975fcd4b8f93cb8c602ddeb165c485214eac10a4..d3137c9e5cc42ef191ea233b0d37eafeffc6f82c 100644 +--- a/src/main/java/net/minecraft/world/level/Level.java ++++ b/src/main/java/net/minecraft/world/level/Level.java +@@ -547,6 +547,11 @@ public abstract class Level implements LevelAccessor, AutoCloseable { + + if ((i & 2) != 0 && (!this.isClientSide || (i & 4) == 0) && (this.isClientSide || chunk == null || (chunk.getFullStatus() != null && chunk.getFullStatus().isOrAfter(FullChunkStatus.BLOCK_TICKING)))) { // allow chunk to be null here as chunk.isReady() is false when we send our notification during block placement + this.sendBlockUpdated(blockposition, iblockdata1, iblockdata, i); ++ // Paper start - per player view distance - allow block updates for non-ticking chunks in player view distance ++ // if copied from above ++ } else if ((i & 2) != 0 && (!this.isClientSide || (i & 4) == 0)) { // Paper - replace old player chunk management ++ ((ServerLevel)this).getChunkSource().blockChanged(blockposition); ++ // Paper end - per player view distance + } + + if ((i & 1) != 0) { +@@ -941,7 +946,7 @@ public abstract class Level implements LevelAccessor, AutoCloseable { + } + // Paper end - Perf: Optimize capturedTileEntities lookup + // CraftBukkit end +- return this.isOutsideBuildHeight(blockposition) ? null : (!this.isClientSide && Thread.currentThread() != this.thread ? null : this.getChunkAt(blockposition).getBlockEntity(blockposition, LevelChunk.EntityCreationType.IMMEDIATE)); ++ return this.isOutsideBuildHeight(blockposition) ? null : (!this.isClientSide && !io.papermc.paper.util.TickThread.isTickThread() ? null : this.getChunkAt(blockposition).getBlockEntity(blockposition, LevelChunk.EntityCreationType.IMMEDIATE)); // Paper - rewrite chunk system + } + + public void setBlockEntity(BlockEntity blockEntity) { +@@ -1032,26 +1037,7 @@ public abstract class Level implements LevelAccessor, AutoCloseable { + public List<Entity> getEntities(@Nullable Entity except, AABB box, Predicate<? super Entity> predicate) { + this.getProfiler().incrementCounter("getEntities"); + List<Entity> list = Lists.newArrayList(); +- +- this.getEntities().get(box, (entity1) -> { +- if (entity1 != except && predicate.test(entity1)) { +- list.add(entity1); +- } +- +- if (entity1 instanceof EnderDragon) { +- EnderDragonPart[] aentitycomplexpart = ((EnderDragon) entity1).getSubEntities(); +- int i = aentitycomplexpart.length; +- +- for (int j = 0; j < i; ++j) { +- EnderDragonPart entitycomplexpart = aentitycomplexpart[j]; +- +- if (entity1 != except && predicate.test(entitycomplexpart)) { +- list.add(entitycomplexpart); +- } +- } +- } +- +- }); ++ ((ServerLevel)this).getEntityLookup().getEntities(except, box, list, predicate); // Paper - optimise this call + return list; + } + +@@ -1069,33 +1055,23 @@ public abstract class Level implements LevelAccessor, AutoCloseable { + + public <T extends Entity> void getEntities(EntityTypeTest<Entity, T> filter, AABB box, Predicate<? super T> predicate, List<? super T> result, int limit) { + this.getProfiler().incrementCounter("getEntities"); +- this.getEntities().get(filter, box, (entity) -> { +- if (predicate.test(entity)) { +- result.add(entity); +- if (result.size() >= limit) { +- return AbortableIterationConsumer.Continuation.ABORT; +- } +- } +- +- if (entity instanceof EnderDragon entityenderdragon) { +- EnderDragonPart[] aentitycomplexpart = entityenderdragon.getSubEntities(); +- int j = aentitycomplexpart.length; +- +- for (int k = 0; k < j; ++k) { +- EnderDragonPart entitycomplexpart = aentitycomplexpart[k]; +- T t0 = filter.tryCast(entitycomplexpart); // CraftBukkit - decompile error +- +- if (t0 != null && predicate.test(t0)) { +- result.add(t0); +- if (result.size() >= limit) { +- return AbortableIterationConsumer.Continuation.ABORT; +- } +- } +- } ++ // Paper start - optimise this call ++ //TODO use limit ++ if (filter instanceof net.minecraft.world.entity.EntityType entityTypeTest) { ++ ((ServerLevel) this).getEntityLookup().getEntities(entityTypeTest, box, result, predicate); ++ } else { ++ Predicate<? super T> test = (obj) -> { ++ return filter.tryCast(obj) != null; ++ }; ++ predicate = predicate == null ? test : test.and((Predicate) predicate); ++ Class base; ++ if (filter == null || (base = filter.getBaseClass()) == null || base == Entity.class) { ++ ((ServerLevel) this).getEntityLookup().getEntities((Entity) null, box, (List) result, (Predicate)predicate); ++ } else { ++ ((ServerLevel) this).getEntityLookup().getEntities(base, null, box, (List) result, (Predicate)predicate); // Paper - optimise this call + } +- +- return AbortableIterationConsumer.Continuation.CONTINUE; +- }); ++ } ++ // Paper end - optimise this call + } + + @Nullable +@@ -1385,4 +1361,45 @@ public abstract class Level implements LevelAccessor, AutoCloseable { + } + } + // Paper end - notify observers even if grow failed ++ // Paper start ++ //protected final io.papermc.paper.world.EntitySliceManager entitySliceManager; // Paper - rewrite chunk system ++ ++ public org.bukkit.entity.Entity[] getChunkEntities(int chunkX, int chunkZ) { ++ io.papermc.paper.world.ChunkEntitySlices slices = ((ServerLevel)this).getEntityLookup().getChunk(chunkX, chunkZ); ++ if (slices == null) { ++ return new org.bukkit.entity.Entity[0]; ++ } ++ return slices.getChunkEntities(); ++ } ++ ++ @Override ++ public List<Entity> getHardCollidingEntities(Entity except, AABB box, Predicate<? super Entity> predicate) { ++ List<Entity> ret = new java.util.ArrayList<>(); ++ ((ServerLevel)this).getEntityLookup().getHardCollidingEntities(except, box, ret, predicate); ++ return ret; ++ } ++ ++ @Override ++ public void getEntities(Entity except, AABB box, Predicate<? super Entity> predicate, List<Entity> into) { ++ ((ServerLevel)this).getEntityLookup().getEntities(except, box, into, predicate); ++ } ++ ++ @Override ++ public void getHardCollidingEntities(Entity except, AABB box, Predicate<? super Entity> predicate, List<Entity> into) { ++ ((ServerLevel)this).getEntityLookup().getHardCollidingEntities(except, box, into, predicate); ++ } ++ ++ @Override ++ public <T> void getEntitiesByClass(Class<? extends T> clazz, Entity except, final AABB box, List<? super T> into, ++ Predicate<? super T> predicate) { ++ ((ServerLevel)this).getEntityLookup().getEntities((Class)clazz, except, box, (List)into, (Predicate)predicate); ++ } ++ ++ @Override ++ public <T extends Entity> List<T> getEntitiesOfClass(Class<T> entityClass, AABB box, Predicate<? super T> predicate) { ++ List<T> ret = new java.util.ArrayList<>(); ++ ((ServerLevel)this).getEntityLookup().getEntities(entityClass, null, box, ret, predicate); ++ return ret; ++ } ++ // Paper end + } +diff --git a/src/main/java/net/minecraft/world/level/LevelReader.java b/src/main/java/net/minecraft/world/level/LevelReader.java +index a0ae26d6197e1069ca09982b4f8b706c55ae8491..32bfeb9aa87b43a9d2ce46dcc99dbd0ff355b412 100644 +--- a/src/main/java/net/minecraft/world/level/LevelReader.java ++++ b/src/main/java/net/minecraft/world/level/LevelReader.java +@@ -26,6 +26,15 @@ public interface LevelReader extends BlockAndTintGetter, CollisionGetter, Signal + @Nullable + ChunkAccess getChunk(int chunkX, int chunkZ, ChunkStatus leastStatus, boolean create); + ++ // Paper start - rewrite chunk system ++ default ChunkAccess syncLoadNonFull(int chunkX, int chunkZ, ChunkStatus status) { ++ if (status == null || status.isOrAfter(ChunkStatus.FULL)) { ++ throw new IllegalArgumentException("Status: " + status.toString()); ++ } ++ return this.getChunk(chunkX, chunkZ, status, true); ++ } ++ // Paper end - rewrite chunk system ++ + @Nullable ChunkAccess getChunkIfLoadedImmediately(int x, int z); // Paper - ifLoaded api (we need this since current impl blocks if the chunk is loading) + @Nullable default ChunkAccess getChunkIfLoadedImmediately(BlockPos pos) { return this.getChunkIfLoadedImmediately(pos.getX() >> 4, pos.getZ() >> 4);} + +diff --git a/src/main/java/net/minecraft/world/level/chunk/ChunkGenerator.java b/src/main/java/net/minecraft/world/level/chunk/ChunkGenerator.java +index c9cd18ce79a6ee7297a8fd14f4dbe712570b3ced..927bdebdb8ae01613f0cea074b3367bd7ffe9ab1 100644 +--- a/src/main/java/net/minecraft/world/level/chunk/ChunkGenerator.java ++++ b/src/main/java/net/minecraft/world/level/chunk/ChunkGenerator.java +@@ -120,7 +120,7 @@ public abstract class ChunkGenerator { + return CompletableFuture.supplyAsync(Util.wrapThreadWithTaskName("init_biomes", () -> { + chunk.fillBiomesFromNoise(this.biomeSource, noiseConfig.sampler()); + return chunk; +- }), Util.backgroundExecutor()); ++ }), executor); // Paper - run with supplied executor + } + + public abstract void applyCarvers(WorldGenRegion chunkRegion, long seed, RandomState noiseConfig, BiomeManager biomeAccess, StructureManager structureAccessor, ChunkAccess chunk, GenerationStep.Carving carverStep); +@@ -315,7 +315,7 @@ public abstract class ChunkGenerator { + return Pair.of(placement.getLocatePos(pos), holder); + } + +- ChunkAccess ichunkaccess = world.getChunk(pos.x, pos.z, ChunkStatus.STRUCTURE_STARTS); ++ ChunkAccess ichunkaccess = world.syncLoadNonFull(pos.x, pos.z, ChunkStatus.STRUCTURE_STARTS); // Paper - rewrite chunk system + + structurestart = structureAccessor.getStartForStructure(SectionPos.bottomOf(ichunkaccess), (Structure) holder.value(), ichunkaccess); + } while (structurestart == null); +diff --git a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java +index bac191f92ea3735df19c68d5568c2c7962c8680f..5d94aee1303d9eca5f1fa9a2e033ad0d12909635 100644 +--- a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java ++++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java +@@ -86,6 +86,7 @@ public class LevelChunk extends ChunkAccess { + private final Int2ObjectMap<GameEventListenerRegistry> gameEventListenerRegistrySections; + private final LevelChunkTicks<Block> blockTicks; + private final LevelChunkTicks<Fluid> fluidTicks; ++ public volatile FullChunkStatus chunkStatus = FullChunkStatus.INACCESSIBLE; // Paper - rewrite chunk system + + public LevelChunk(Level world, ChunkPos pos) { + this(world, pos, UpgradeData.EMPTY, new LevelChunkTicks<>(), new LevelChunkTicks<>(), 0L, (LevelChunkSection[]) null, (LevelChunk.PostLoadProcessor) null, (BlendingData) null); +@@ -690,9 +691,26 @@ public class LevelChunk extends ChunkAccess { + + } + +- // CraftBukkit start +- public void loadCallback() { +- // Paper start - neighbour cache ++ // Paper start - new load callbacks ++ private io.papermc.paper.chunk.system.scheduling.NewChunkHolder chunkHolder; ++ public io.papermc.paper.chunk.system.scheduling.NewChunkHolder getChunkHolder() { ++ return this.chunkHolder; ++ } ++ ++ public void setChunkHolder(io.papermc.paper.chunk.system.scheduling.NewChunkHolder chunkHolder) { ++ if (chunkHolder == null) { ++ throw new NullPointerException("Chunkholder cannot be null"); ++ } ++ if (this.chunkHolder != null) { ++ throw new IllegalStateException("Already have chunkholder: " + this.chunkHolder + ", cannot replace with " + chunkHolder); ++ } ++ this.chunkHolder = chunkHolder; ++ this.playerChunk = chunkHolder.vanillaChunkHolder; ++ } ++ ++ /* Note: We skip the light neighbour chunk loading done for the vanilla full chunk */ ++ /* Starlight does not need these chunks for lighting purposes because of edge checks */ ++ public void pushChunkIntoLoadedMap() { + int chunkX = this.chunkPos.x; + int chunkZ = this.chunkPos.z; + net.minecraft.server.level.ServerChunkCache chunkProvider = this.level.getChunkSource(); +@@ -707,10 +725,55 @@ public class LevelChunk extends ChunkAccess { + } + } + this.setNeighbourLoaded(0, 0, this); ++ this.level.getChunkSource().addLoadedChunk(this); ++ } ++ ++ public void onChunkLoad(io.papermc.paper.chunk.system.scheduling.NewChunkHolder chunkHolder) { ++ // figure out how this should interface with: ++ // the entity chunk load event // -> moved to the FULL status ++ // the chunk load event // -> stays here ++ // any entity add to world events // -> in FULL status ++ this.loadCallback(); ++ io.papermc.paper.chunk.system.ChunkSystem.onChunkBorder(this, chunkHolder.vanillaChunkHolder); ++ } ++ ++ public void onChunkUnload(io.papermc.paper.chunk.system.scheduling.NewChunkHolder chunkHolder) { ++ // figure out how this should interface with: ++ // the entity chunk load event // -> moved to chunk unload to disk (not written yet) ++ // the chunk load event // -> stays here ++ // any entity add to world events // -> goes into the unload logic, it will completely explode ++ // etc later ++ this.unloadCallback(); ++ io.papermc.paper.chunk.system.ChunkSystem.onChunkNotBorder(this, chunkHolder.vanillaChunkHolder); ++ } ++ ++ public void onChunkTicking(io.papermc.paper.chunk.system.scheduling.NewChunkHolder chunkHolder) { ++ this.postProcessGeneration(); ++ this.level.startTickingChunk(this); ++ io.papermc.paper.chunk.system.ChunkSystem.onChunkTicking(this, chunkHolder.vanillaChunkHolder); ++ } ++ ++ public void onChunkNotTicking(io.papermc.paper.chunk.system.scheduling.NewChunkHolder chunkHolder) { ++ io.papermc.paper.chunk.system.ChunkSystem.onChunkNotTicking(this, chunkHolder.vanillaChunkHolder); ++ } ++ ++ public void onChunkEntityTicking(io.papermc.paper.chunk.system.scheduling.NewChunkHolder chunkHolder) { ++ io.papermc.paper.chunk.system.ChunkSystem.onChunkEntityTicking(this, chunkHolder.vanillaChunkHolder); ++ } ++ ++ public void onChunkNotEntityTicking(io.papermc.paper.chunk.system.scheduling.NewChunkHolder chunkHolder) { ++ io.papermc.paper.chunk.system.ChunkSystem.onChunkNotEntityTicking(this, chunkHolder.vanillaChunkHolder); ++ } ++ // Paper end - new load callbacks ++ ++ // CraftBukkit start ++ public void loadCallback() { ++ if (this.loadedTicketLevel) { LOGGER.error("Double calling chunk load!", new Throwable()); } // Paper ++ // Paper - rewrite chunk system - move into separate callback + this.loadedTicketLevel = true; +- // Paper end - neighbour cache ++ // Paper - rewrite chunk system - move into separate callback + org.bukkit.Server server = this.level.getCraftServer(); +- this.level.getChunkSource().addLoadedChunk(this); // Paper ++ // Paper - rewrite chunk system - move into separate callback + if (server != null) { + /* + * If it's a new world, the first few chunks are generated inside +@@ -719,6 +782,7 @@ public class LevelChunk extends ChunkAccess { + */ + org.bukkit.Chunk bukkitChunk = new org.bukkit.craftbukkit.CraftChunk(this); + server.getPluginManager().callEvent(new org.bukkit.event.world.ChunkLoadEvent(bukkitChunk, this.needsDecoration)); ++ this.chunkHolder.getEntityChunk().callEntitiesLoadEvent(); // Paper - rewrite chunk system + + if (this.needsDecoration) { + try (co.aikar.timings.Timing ignored = this.level.timings.chunkLoadPopulate.startTiming()) { // Paper +@@ -747,9 +811,11 @@ public class LevelChunk extends ChunkAccess { + } + + public void unloadCallback() { ++ if (!this.loadedTicketLevel) { LOGGER.error("Double calling chunk unload!", new Throwable()); } // Paper + org.bukkit.Server server = this.level.getCraftServer(); ++ this.chunkHolder.getEntityChunk().callEntitiesUnloadEvent(); // Paper - rewrite chunk system + org.bukkit.Chunk bukkitChunk = new org.bukkit.craftbukkit.CraftChunk(this); +- org.bukkit.event.world.ChunkUnloadEvent unloadEvent = new org.bukkit.event.world.ChunkUnloadEvent(bukkitChunk, this.isUnsaved()); ++ org.bukkit.event.world.ChunkUnloadEvent unloadEvent = new org.bukkit.event.world.ChunkUnloadEvent(bukkitChunk, true); // Paper - rewrite chunk system - force save to true so that mustNotSave is correctly set below + server.getPluginManager().callEvent(unloadEvent); + // note: saving can be prevented, but not forced if no saving is actually required + this.mustNotSave = !unloadEvent.isSaveChunk(); +@@ -771,9 +837,26 @@ public class LevelChunk extends ChunkAccess { + // Paper end + } + ++ // Paper start - add dirty system to tick lists ++ @Override ++ public void setUnsaved(boolean needsSaving) { ++ if (!needsSaving) { ++ this.blockTicks.clearDirty(); ++ this.fluidTicks.clearDirty(); ++ } ++ super.setUnsaved(needsSaving); ++ } ++ // Paper end - add dirty system to tick lists ++ + @Override + public boolean isUnsaved() { +- return super.isUnsaved() && !this.mustNotSave; ++ // Paper start - add dirty system to tick lists ++ long gameTime = this.level.getLevelData().getGameTime(); ++ if (this.blockTicks.isDirty(gameTime) || this.fluidTicks.isDirty(gameTime)) { ++ return true; ++ } ++ // Paper end - add dirty system to tick lists ++ return super.isUnsaved(); // Paper - rewrite chunk system - do NOT clobber the dirty flag + } + // CraftBukkit end + +@@ -842,7 +925,9 @@ public class LevelChunk extends ChunkAccess { + return this.blockEntities; + } + ++ public boolean isPostProcessingDone; // Paper - replace chunk loader system + public void postProcessGeneration() { ++ try { // Paper - replace chunk loader system + ChunkPos chunkcoordintpair = this.getPos(); + + for (int i = 0; i < this.postProcessing.length; ++i) { +@@ -863,6 +948,7 @@ public class LevelChunk extends ChunkAccess { + BlockState iblockdata1 = Block.updateFromNeighbourShapes(iblockdata, this.level, blockposition); + + this.level.setBlock(blockposition, iblockdata1, 20); ++ if (iblockdata1 != iblockdata) this.level.chunkSource.blockChanged(blockposition); // Paper - replace player chunk loader - notify since we send before processing full updates + } + } + +@@ -880,6 +966,10 @@ public class LevelChunk extends ChunkAccess { + + this.pendingBlockEntities.clear(); + this.upgradeData.upgrade(this); ++ } finally { // Paper start - replace chunk loader system ++ this.isPostProcessingDone = true; ++ } ++ // Paper end - replace chunk loader system + } + + @Nullable +@@ -929,7 +1019,7 @@ public class LevelChunk extends ChunkAccess { + } + + public FullChunkStatus getFullStatus() { +- return this.fullStatus == null ? FullChunkStatus.FULL : (FullChunkStatus) this.fullStatus.get(); ++ return this.chunkHolder == null ? FullChunkStatus.INACCESSIBLE : this.chunkHolder.getChunkStatus(); // Paper - rewrite chunk system + } + + public void setFullStatus(Supplier<FullChunkStatus> levelTypeProvider) { +diff --git a/src/main/java/net/minecraft/world/level/chunk/status/ChunkStatus.java b/src/main/java/net/minecraft/world/level/chunk/status/ChunkStatus.java +index 95318092f8281d98132d1d3ceb4a5c36cf32eb05..b81c548c0e1ac53784e9c94b34b65db5f123309c 100644 +--- a/src/main/java/net/minecraft/world/level/chunk/status/ChunkStatus.java ++++ b/src/main/java/net/minecraft/world/level/chunk/status/ChunkStatus.java +@@ -21,13 +21,15 @@ import net.minecraft.world.level.chunk.ProtoChunk; + import net.minecraft.world.level.levelgen.Heightmap; + + public class ChunkStatus { ++ static final ChunkStatus.LoadingTask PASSTHROUGH_LOAD_TASK = (WorldGenContext context, ChunkStatus status, ToFullChunk fullChunkConverter, ChunkAccess chunk) -> CompletableFuture.completedFuture(chunk); // Paper - rewrite chunk system ++ protected static final java.util.List<ChunkStatus> statuses = new java.util.ArrayList<>(); // Paper - rewrite chunk system + public static final int MAX_STRUCTURE_DISTANCE = 8; + private static final EnumSet<Heightmap.Types> PRE_FEATURES = EnumSet.of(Heightmap.Types.OCEAN_FLOOR_WG, Heightmap.Types.WORLD_SURFACE_WG); + public static final EnumSet<Heightmap.Types> POST_FEATURES = EnumSet.of( + Heightmap.Types.OCEAN_FLOOR, Heightmap.Types.WORLD_SURFACE, Heightmap.Types.MOTION_BLOCKING, Heightmap.Types.MOTION_BLOCKING_NO_LEAVES + ); + public static final ChunkStatus EMPTY = register( +- "empty", null, -1, false, PRE_FEATURES, ChunkType.PROTOCHUNK, ChunkStatusTasks::generateEmpty, ChunkStatusTasks::loadPassThrough ++ "empty", null, -1, false, PRE_FEATURES, ChunkType.PROTOCHUNK, ChunkStatusTasks::generateEmpty, PASSTHROUGH_LOAD_TASK // Paper - rewrite chunk system + ); + public static final ChunkStatus STRUCTURE_STARTS = register( + "structure_starts", +@@ -47,22 +49,22 @@ public class ChunkStatus { + PRE_FEATURES, + ChunkType.PROTOCHUNK, + ChunkStatusTasks::generateStructureReferences, +- ChunkStatusTasks::loadPassThrough ++ PASSTHROUGH_LOAD_TASK // Paper - rewrite chunk system + ); + public static final ChunkStatus BIOMES = register( +- "biomes", STRUCTURE_REFERENCES, 8, false, PRE_FEATURES, ChunkType.PROTOCHUNK, ChunkStatusTasks::generateBiomes, ChunkStatusTasks::loadPassThrough ++ "biomes", STRUCTURE_REFERENCES, 8, false, PRE_FEATURES, ChunkType.PROTOCHUNK, ChunkStatusTasks::generateBiomes, PASSTHROUGH_LOAD_TASK // Paper - rewrite chunk system + ); + public static final ChunkStatus NOISE = register( +- "noise", BIOMES, 8, false, PRE_FEATURES, ChunkType.PROTOCHUNK, ChunkStatusTasks::generateNoise, ChunkStatusTasks::loadPassThrough ++ "noise", BIOMES, 8, false, PRE_FEATURES, ChunkType.PROTOCHUNK, ChunkStatusTasks::generateNoise, PASSTHROUGH_LOAD_TASK // Paper - rewrite chunk system + ); + public static final ChunkStatus SURFACE = register( +- "surface", NOISE, 8, false, PRE_FEATURES, ChunkType.PROTOCHUNK, ChunkStatusTasks::generateSurface, ChunkStatusTasks::loadPassThrough ++ "surface", NOISE, 8, false, PRE_FEATURES, ChunkType.PROTOCHUNK, ChunkStatusTasks::generateSurface, PASSTHROUGH_LOAD_TASK // Paper - rewrite chunk system + ); + public static final ChunkStatus CARVERS = register( +- "carvers", SURFACE, 8, false, POST_FEATURES, ChunkType.PROTOCHUNK, ChunkStatusTasks::generateCarvers, ChunkStatusTasks::loadPassThrough ++ "carvers", SURFACE, 8, false, POST_FEATURES, ChunkType.PROTOCHUNK, ChunkStatusTasks::generateCarvers, PASSTHROUGH_LOAD_TASK // Paper - rewrite chunk system + ); + public static final ChunkStatus FEATURES = register( +- "features", CARVERS, 8, false, POST_FEATURES, ChunkType.PROTOCHUNK, ChunkStatusTasks::generateFeatures, ChunkStatusTasks::loadPassThrough ++ "features", CARVERS, 8, false, POST_FEATURES, ChunkType.PROTOCHUNK, ChunkStatusTasks::generateFeatures, PASSTHROUGH_LOAD_TASK // Paper - rewrite chunk system + ); + public static final ChunkStatus INITIALIZE_LIGHT = register( + "initialize_light", +@@ -78,7 +80,7 @@ public class ChunkStatus { + "light", INITIALIZE_LIGHT, 1, true, POST_FEATURES, ChunkType.PROTOCHUNK, ChunkStatusTasks::generateLight, ChunkStatusTasks::loadLight + ); + public static final ChunkStatus SPAWN = register( +- "spawn", LIGHT, 1, false, POST_FEATURES, ChunkType.PROTOCHUNK, ChunkStatusTasks::generateSpawn, ChunkStatusTasks::loadPassThrough ++ "spawn", LIGHT, 1, false, POST_FEATURES, ChunkType.PROTOCHUNK, ChunkStatusTasks::generateSpawn, PASSTHROUGH_LOAD_TASK // Paper - rewrite chunk system + ); + public static final ChunkStatus FULL = register( + "full", SPAWN, 0, false, POST_FEATURES, ChunkType.LEVELCHUNK, ChunkStatusTasks::generateFull, ChunkStatusTasks::loadFull +@@ -128,6 +130,27 @@ public class ChunkStatus { + } + } + // Paper end - starlight ++ // Paper start - rewrite chunk system ++ public boolean isParallelCapable; // Paper ++ public int writeRadius = -1; ++ public int loadRange = 0; ++ ++ private ChunkStatus nextStatus; ++ ++ public final ChunkStatus getNextStatus() { ++ return this.nextStatus; ++ } ++ ++ public final boolean isEmptyLoadStatus() { ++ return this.loadingTask == PASSTHROUGH_LOAD_TASK; ++ } ++ ++ public final boolean isEmptyGenStatus() { ++ return this == ChunkStatus.EMPTY; ++ } ++ ++ public final java.util.concurrent.atomic.AtomicBoolean warnedAboutNoImmediateComplete = new java.util.concurrent.atomic.AtomicBoolean(); ++ // Paper end - rewrite chunk system + + private static ChunkStatus register( + String id, +@@ -190,6 +213,13 @@ public class ChunkStatus { + this.chunkType = chunkType; + this.heightmapsAfter = heightMapTypes; + this.index = previous == null ? 0 : previous.getIndex() + 1; ++ // Paper start ++ this.nextStatus = this; ++ if (statuses.size() > 0) { ++ statuses.get(statuses.size() - 1).nextStatus = this; ++ } ++ statuses.add(this); ++ // Paper end + } + + public int getIndex() { +diff --git a/src/main/java/net/minecraft/world/level/chunk/status/ChunkStatusTasks.java b/src/main/java/net/minecraft/world/level/chunk/status/ChunkStatusTasks.java +index ce7f154b9dad4e78ee0189405cf57dcb3d5301b8..b66c0c4a9e9b9e5dbcb51b23319f0d4b23837139 100644 +--- a/src/main/java/net/minecraft/world/level/chunk/status/ChunkStatusTasks.java ++++ b/src/main/java/net/minecraft/world/level/chunk/status/ChunkStatusTasks.java +@@ -26,8 +26,9 @@ public class ChunkStatusTasks { + return CompletableFuture.completedFuture(chunk); + } + +- static CompletableFuture<ChunkAccess> loadPassThrough(WorldGenContext context, ChunkStatus status, ToFullChunk fullChunkConverter, ChunkAccess chunk) { +- return CompletableFuture.completedFuture(chunk); ++ @io.papermc.paper.annotation.DoNotUse @Deprecated(forRemoval = true) // Paper - rewrite chunk system - use ChunkStatus.PASSTHROUGH_LOAD_TASK instead ++ static CompletableFuture<ChunkAccess> loadPassThrough(WorldGenContext context, ChunkStatus status, ToFullChunk fullChunkConverter, ChunkAccess chunk) { // Paper - rewrite chunk system - diff on change ++ return CompletableFuture.completedFuture(chunk); // Paper - rewrite chunk system - diff on change + } + + static CompletableFuture<ChunkAccess> generateStructureStarts(WorldGenContext context, ChunkStatus status, Executor executor, ToFullChunk fullChunkConverter, List<ChunkAccess> chunks, ChunkAccess chunk) { +@@ -113,11 +114,11 @@ public class ChunkStatusTasks { + } + + static CompletableFuture<ChunkAccess> generateInitializeLight(WorldGenContext context, ChunkStatus status, Executor executor, ToFullChunk fullChunkConverter, List<ChunkAccess> chunks, ChunkAccess chunk) { +- return ChunkStatusTasks.initializeLight(context.lightEngine(), chunk); ++ return CompletableFuture.completedFuture(chunk); // Paper - rewrite chunk system + } + + static CompletableFuture<ChunkAccess> loadInitializeLight(WorldGenContext context, ChunkStatus status, ToFullChunk fullChunkConverter, ChunkAccess chunk) { +- return ChunkStatusTasks.initializeLight(context.lightEngine(), chunk); ++ return CompletableFuture.completedFuture(chunk); // Paper - rewrite chunk system + } + + private static CompletableFuture<ChunkAccess> initializeLight(ThreadedLevelLightEngine lightingProvider, ChunkAccess chunk) { +diff --git a/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java b/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java +index 01d6b8683a9fa30d05b03ebfef8ee2dca4e83a56..b2e8082dda0d0ca32bfc32cbf9d8ae9822febc30 100644 +--- a/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java ++++ b/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java +@@ -112,6 +112,17 @@ public class ChunkSerializer { + } + } + // Paper end - guard against serializing mismatching coordinates ++ // Paper start - rewrite chunk system ++ public static final class InProgressChunkHolder { ++ ++ public final ProtoChunk protoChunk; ++ ++ public CompoundTag poiData; ++ ++ public InProgressChunkHolder(final ProtoChunk protoChunk) { ++ this.protoChunk = protoChunk; ++ } ++ } + public static ProtoChunk read(ServerLevel world, PoiManager poiStorage, ChunkPos chunkPos, CompoundTag nbt) { + // Paper start - Do not let the server load chunks from newer versions + if (nbt.contains("DataVersion", net.minecraft.nbt.Tag.TAG_ANY_NUMERIC)) { +@@ -122,6 +133,12 @@ public class ChunkSerializer { + } + } + // Paper end - Do not let the server load chunks from newer versions ++ InProgressChunkHolder holder = readInProgressChunkHolder(world, poiStorage, chunkPos, nbt); ++ return holder.protoChunk; ++ } ++ ++ public static InProgressChunkHolder readInProgressChunkHolder(ServerLevel world, PoiManager poiStorage, ChunkPos chunkPos, CompoundTag nbt) { ++ // Paper end - rewrite chunk system + ChunkPos chunkcoordintpair1 = new ChunkPos(nbt.getInt("xPos"), nbt.getInt("zPos")); // Paper - guard against serializing mismatching coordinates; diff on change, see ChunkSerializer#getChunkCoordinate + + if (!Objects.equals(chunkPos, chunkcoordintpair1)) { +@@ -178,7 +195,7 @@ public class ChunkSerializer { + achunksection[k] = chunksection; + SectionPos sectionposition = SectionPos.of(chunkPos, b0); + +- poiStorage.checkConsistencyWithBlocks(sectionposition, chunksection); ++ // Paper - rewrite chunk system - moved to final load stage + } + + boolean flag3 = nbttagcompound1.contains("BlockLight", 7); +@@ -325,7 +342,7 @@ public class ChunkSerializer { + } + + if (chunktype == ChunkType.LEVELCHUNK) { +- return new ImposterProtoChunk((LevelChunk) object1, false); ++ return new InProgressChunkHolder(new ImposterProtoChunk((LevelChunk) object1, false)); // Paper - Async chunk loading + } else { + ProtoChunk protochunk1 = (ProtoChunk) object1; + +@@ -360,9 +377,41 @@ public class ChunkSerializer { + protochunk1.setCarvingMask(worldgenstage_features, new CarvingMask(nbttagcompound5.getLongArray(s1), ((ChunkAccess) object1).getMinBuildHeight())); + } + +- return protochunk1; ++ return new InProgressChunkHolder(protochunk1); // Paper - Async chunk loading ++ } ++ } ++ ++ // Paper start - async chunk save for unload ++ public record AsyncSaveData( ++ Tag blockTickList, // non-null if we had to go to the server's tick list ++ Tag fluidTickList, // non-null if we had to go to the server's tick list ++ ListTag blockEntities, ++ long worldTime ++ ) {} ++ ++ // must be called sync ++ public static AsyncSaveData getAsyncSaveData(ServerLevel world, ChunkAccess chunk) { ++ org.spigotmc.AsyncCatcher.catchOp("preparation of chunk data for async save"); ++ ++ final CompoundTag tickLists = new CompoundTag(); ++ ChunkSerializer.saveTicks(world, tickLists, chunk.getTicksForSerialization()); ++ ++ ListTag blockEntitiesSerialized = new ListTag(); ++ for (final BlockPos blockPos : chunk.getBlockEntitiesPos()) { ++ final CompoundTag blockEntityNbt = chunk.getBlockEntityNbtForSaving(blockPos, world.registryAccess()); ++ if (blockEntityNbt != null) { ++ blockEntitiesSerialized.add(blockEntityNbt); ++ } + } ++ ++ return new AsyncSaveData( ++ tickLists.get(BLOCK_TICKS_TAG), ++ tickLists.get(FLUID_TICKS_TAG), ++ blockEntitiesSerialized, ++ world.getGameTime() ++ ); + } ++ // Paper end + + private static void logErrors(ChunkPos chunkPos, int y, String message) { + ChunkSerializer.LOGGER.error("Recoverable errors when loading section [" + chunkPos.x + ", " + y + ", " + chunkPos.z + "]: " + message); +@@ -379,6 +428,11 @@ public class ChunkSerializer { + // CraftBukkit end + + public static CompoundTag write(ServerLevel world, ChunkAccess chunk) { ++ // Paper start ++ return saveChunk(world, chunk, null); ++ } ++ public static CompoundTag saveChunk(ServerLevel world, ChunkAccess chunk, @org.checkerframework.checker.nullness.qual.Nullable AsyncSaveData asyncsavedata) { ++ // Paper end + // Paper start - rewrite light impl + final int minSection = io.papermc.paper.util.WorldUtil.getMinLightSection(world); + final int maxSection = io.papermc.paper.util.WorldUtil.getMaxLightSection(world); +@@ -391,7 +445,7 @@ public class ChunkSerializer { + nbttagcompound.putInt("xPos", chunkcoordintpair.x); + nbttagcompound.putInt("yPos", chunk.getMinSection()); + nbttagcompound.putInt("zPos", chunkcoordintpair.z); +- nbttagcompound.putLong("LastUpdate", world.getGameTime()); ++ nbttagcompound.putLong("LastUpdate", asyncsavedata != null ? asyncsavedata.worldTime : world.getGameTime()); // Paper - async chunk unloading + nbttagcompound.putLong("InhabitedTime", chunk.getInhabitedTime()); + nbttagcompound.putString("Status", BuiltInRegistries.CHUNK_STATUS.getKey(chunk.getStatus()).toString()); + BlendingData blendingdata = chunk.getBlendingData(); +@@ -485,8 +539,17 @@ public class ChunkSerializer { + nbttagcompound.putBoolean("isLightOn", false); // Paper - set to false but still store, this allows us to detect --eraseCache (as eraseCache _removes_) + } + +- ListTag nbttaglist1 = new ListTag(); +- Iterator iterator = chunk.getBlockEntitiesPos().iterator(); ++ // Paper start ++ ListTag nbttaglist1; ++ Iterator<BlockPos> iterator; ++ if (asyncsavedata != null) { ++ nbttaglist1 = asyncsavedata.blockEntities; ++ iterator = java.util.Collections.emptyIterator(); ++ } else { ++ nbttaglist1 = new ListTag(); ++ iterator = chunk.getBlockEntitiesPos().iterator(); ++ } ++ // Paper end + + CompoundTag nbttagcompound2; + +@@ -522,7 +585,14 @@ public class ChunkSerializer { + nbttagcompound.put("CarvingMasks", nbttagcompound2); + } + ++ // Paper start ++ if (asyncsavedata != null) { ++ nbttagcompound.put(BLOCK_TICKS_TAG, asyncsavedata.blockTickList); ++ nbttagcompound.put(FLUID_TICKS_TAG, asyncsavedata.fluidTickList); ++ } else { + ChunkSerializer.saveTicks(world, nbttagcompound, chunk.getTicksForSerialization()); ++ } ++ // Paper end + nbttagcompound.put("PostProcessing", ChunkSerializer.packOffsets(chunk.getPostProcessing())); + CompoundTag nbttagcompound3 = new CompoundTag(); + Iterator iterator1 = chunk.getHeightmaps().iterator(); +@@ -578,7 +648,7 @@ public class ChunkSerializer { + + return nbttaglist == null && nbttaglist1 == null ? null : (chunk) -> { + if (nbttaglist != null) { +- world.addLegacyChunkEntities(EntityType.loadEntitiesRecursive(nbttaglist, world)); ++ world.addLegacyChunkEntities(EntityType.loadEntitiesRecursive(nbttaglist, world), chunk.getPos()); // Paper - rewrite chunk system + } + + if (nbttaglist1 != null) { +diff --git a/src/main/java/net/minecraft/world/level/chunk/storage/ChunkStorage.java b/src/main/java/net/minecraft/world/level/chunk/storage/ChunkStorage.java +index a62c90e10c0dfa4c6211a05c4071932756d7b218..554dede2ad0e45d3ee4ccc5510b7644f2e9e4250 100644 +--- a/src/main/java/net/minecraft/world/level/chunk/storage/ChunkStorage.java ++++ b/src/main/java/net/minecraft/world/level/chunk/storage/ChunkStorage.java +@@ -31,18 +31,21 @@ import net.minecraft.world.level.storage.DimensionDataStorage; + public class ChunkStorage implements AutoCloseable { + + public static final int LAST_MONOLYTH_STRUCTURE_DATA_VERSION = 1493; +- private final IOWorker worker; ++ // Paper start - rewrite chunk system; async chunk IO ++ private final Object persistentDataLock = new Object(); ++ public final RegionFileStorage regionFileCache; ++ // Paper end - rewrite chunk system + protected final DataFixer fixerUpper; + @Nullable + private volatile LegacyStructureDataHandler legacyStructureHandler; + + public ChunkStorage(RegionStorageInfo storageKey, Path directory, DataFixer dataFixer, boolean dsync) { + this.fixerUpper = dataFixer; +- this.worker = new IOWorker(storageKey, directory, dsync); ++ this.regionFileCache = new RegionFileStorage(storageKey, directory, dsync); // Paper - rewrite chunk system; async chunk IO + } + + public boolean isOldChunkAround(ChunkPos chunkPos, int checkRadius) { +- return this.worker.isOldChunkAround(chunkPos, checkRadius); ++ return true; // Paper - rewrite chunk system + } + + // CraftBukkit start +@@ -50,8 +53,9 @@ public class ChunkStorage implements AutoCloseable { + if (true) return true; // Paper - Perf: this isn't even needed anymore, light is purged updating to 1.14+, why are we holding up the conversion process reading chunk data off disk - return true, we need to set light populated to true so the converter recognizes the chunk as being "full" + ChunkPos pos = new ChunkPos(x, z); + if (cps != null) { +- com.google.common.base.Preconditions.checkState(org.bukkit.Bukkit.isPrimaryThread(), "primary thread"); +- if (cps.hasChunk(x, z)) { ++ // Paper start - rewrite chunk system; async chunk IO ++ if (cps.getChunkAtIfCachedImmediately(x, z) != null) { // isLoaded is a ticket level check, not a chunk loaded check! ++ // Paper end - rewrite chunk system + return true; + } + } +@@ -79,6 +83,7 @@ public class ChunkStorage implements AutoCloseable { + + public CompoundTag upgradeChunkTag(ResourceKey<LevelStem> resourcekey, Supplier<DimensionDataStorage> supplier, CompoundTag nbttagcompound, Optional<ResourceKey<MapCodec<? extends ChunkGenerator>>> optional, ChunkPos pos, @Nullable LevelAccessor generatoraccess) { + // CraftBukkit end ++ nbttagcompound = nbttagcompound.copy(); // Paper - defensive copy, another thread might modify this + int i = ChunkStorage.getVersion(nbttagcompound); + + try { +@@ -97,9 +102,11 @@ public class ChunkStorage implements AutoCloseable { + if (i < 1493) { + ca.spottedleaf.dataconverter.minecraft.MCDataConverter.convertTag(ca.spottedleaf.dataconverter.minecraft.datatypes.MCTypeRegistry.CHUNK, nbttagcompound, i, 1493); // Paper - replace chunk converter + if (nbttagcompound.getCompound("Level").getBoolean("hasLegacyStructureData")) { ++ synchronized (this.persistentDataLock) { // Paper - Async chunk loading + LegacyStructureDataHandler persistentstructurelegacy = this.getLegacyStructureHandler(resourcekey, supplier); + + nbttagcompound = persistentstructurelegacy.updateFromLegacy(nbttagcompound); ++ } // Paper - Async chunk loading + } + } + +@@ -139,7 +146,7 @@ public class ChunkStorage implements AutoCloseable { + LegacyStructureDataHandler persistentstructurelegacy = this.legacyStructureHandler; + + if (persistentstructurelegacy == null) { +- synchronized (this) { ++ synchronized (this.persistentDataLock) { // Paper - async chunk loading + persistentstructurelegacy = this.legacyStructureHandler; + if (persistentstructurelegacy == null) { + this.legacyStructureHandler = persistentstructurelegacy = LegacyStructureDataHandler.getLegacyStructureHandler(worldKey, (DimensionDataStorage) stateManagerGetter.get()); +@@ -165,10 +172,20 @@ public class ChunkStorage implements AutoCloseable { + } + + public CompletableFuture<Optional<CompoundTag>> read(ChunkPos chunkPos) { +- return this.worker.loadAsync(chunkPos); ++ // Paper start - async chunk io ++ try { ++ return CompletableFuture.completedFuture(Optional.ofNullable(this.readSync(chunkPos))); ++ } catch (Throwable thr) { ++ return CompletableFuture.failedFuture(thr); ++ } ++ } ++ @Nullable ++ public CompoundTag readSync(ChunkPos chunkPos) throws IOException { ++ return this.regionFileCache.read(chunkPos); + } ++ // Paper end - async chunk io + +- public CompletableFuture<Void> write(ChunkPos chunkPos, CompoundTag nbt) { ++ public CompletableFuture<Void> write(ChunkPos chunkPos, CompoundTag nbt) throws IOException { // Paper - rewrite chunk system; async chunk io + // Paper start - guard against serializing mismatching coordinates + if (nbt != null && !chunkPos.equals(ChunkSerializer.getChunkCoordinate(nbt))) { + final String world = (this instanceof net.minecraft.server.level.ChunkMap) ? ((net.minecraft.server.level.ChunkMap) this).level.getWorld().getName() : null; +@@ -176,26 +193,39 @@ public class ChunkStorage implements AutoCloseable { + + " but compound says coordinate is " + ChunkSerializer.getChunkCoordinate(nbt) + (world == null ? " for an unknown world" : (" for world: " + world))); + } + // Paper end - guard against serializing mismatching coordinates ++ this.regionFileCache.write(chunkPos, nbt); // Paper - rewrite chunk system; async chunk io, move above legacy structure index + this.handleLegacyStructureIndex(chunkPos); +- return this.worker.store(chunkPos, nbt); ++ // Paper - rewrite chunk system; async chunk io, move above legacy structure index ++ return null; + } + + protected void handleLegacyStructureIndex(ChunkPos chunkPos) { + if (this.legacyStructureHandler != null) { ++ synchronized (this.persistentDataLock) { // Paper - rewrite chunk system; async chunk io + this.legacyStructureHandler.removeIndex(chunkPos.toLong()); ++ } // Paper - rewrite chunk system; async chunk io + } + + } + + public void flushWorker() { +- this.worker.synchronize(true).join(); ++ io.papermc.paper.chunk.system.io.RegionFileIOThread.flush(); // Paper - rewrite chunk system + } + + public void close() throws IOException { +- this.worker.close(); ++ this.regionFileCache.close(); // Paper - nuke IO worker + } + + public ChunkScanAccess chunkScanner() { +- return this.worker; ++ // Paper start - nuke IO worker ++ return ((chunkPos, streamTagVisitor) -> { ++ try { ++ this.regionFileCache.scanChunk(chunkPos, streamTagVisitor); ++ return java.util.concurrent.CompletableFuture.completedFuture(null); ++ } catch (IOException e) { ++ throw new RuntimeException(e); ++ } ++ }); ++ // Paper end + } + } +diff --git a/src/main/java/net/minecraft/world/level/chunk/storage/EntityStorage.java b/src/main/java/net/minecraft/world/level/chunk/storage/EntityStorage.java +index 49d8a62d2b6ca6da4e02b3cec7e42c38b7781b57..9fdf8f857a5f9b231c6d0633eaba498244214f74 100644 +--- a/src/main/java/net/minecraft/world/level/chunk/storage/EntityStorage.java ++++ b/src/main/java/net/minecraft/world/level/chunk/storage/EntityStorage.java +@@ -27,43 +27,30 @@ public class EntityStorage implements EntityPersistentStorage<Entity> { + private static final String ENTITIES_TAG = "Entities"; + private static final String POSITION_TAG = "Position"; + public final ServerLevel level; +- private final SimpleRegionStorage simpleRegionStorage; ++ // Paper - rewrite chunk system + private final LongSet emptyChunks = new LongOpenHashSet(); +- public final ProcessorMailbox<Runnable> entityDeserializerQueue; ++ // Paper - rewrite chunk system + + public EntityStorage(SimpleRegionStorage storage, ServerLevel world, Executor executor) { +- this.simpleRegionStorage = storage; ++ // Paper - rewrite chunk system + this.level = world; +- this.entityDeserializerQueue = ProcessorMailbox.create(executor, "entity-deserializer"); ++ // Paper - rewrite chunk system + } + + @Override + public CompletableFuture<ChunkEntities<Entity>> loadEntities(ChunkPos pos) { +- return this.emptyChunks.contains(pos.toLong()) +- ? CompletableFuture.completedFuture(emptyChunk(pos)) +- : this.simpleRegionStorage.read(pos).thenApplyAsync(nbt -> { +- if (nbt.isEmpty()) { +- this.emptyChunks.add(pos.toLong()); +- return emptyChunk(pos); +- } else { +- try { +- ChunkPos chunkPos2 = readChunkPos(nbt.get()); +- if (!Objects.equals(pos, chunkPos2)) { +- LOGGER.error("Chunk file at {} is in the wrong location. (Expected {}, got {})", pos, pos, chunkPos2); +- } +- } catch (Exception var6) { +- LOGGER.warn("Failed to parse chunk {} position info", pos, var6); +- } +- +- CompoundTag compoundTag = this.simpleRegionStorage.upgradeChunkTag(nbt.get(), -1); +- ListTag listTag = compoundTag.getList("Entities", 10); +- List<Entity> list = EntityType.loadEntitiesRecursive(listTag, this.level).collect(ImmutableList.toImmutableList()); +- return new ChunkEntities<>(pos, list); +- } +- }, this.entityDeserializerQueue::tell); ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system - copy out read logic into readEntities + } + +- private static ChunkPos readChunkPos(CompoundTag chunkNbt) { ++ // Paper start - rewrite chunk system ++ public static List<Entity> readEntities(ServerLevel level, CompoundTag compoundTag) { ++ ListTag listTag = compoundTag.getList("Entities", 10); ++ List<Entity> list = EntityType.loadEntitiesRecursive(listTag, level).collect(ImmutableList.toImmutableList()); ++ return list; ++ } ++ // Paper end - rewrite chunk system ++ ++ public static ChunkPos readChunkPos(CompoundTag chunkNbt) { // Paper - public + int[] is = chunkNbt.getIntArray("Position"); + return new ChunkPos(is[0], is[1]); + } +@@ -78,38 +65,74 @@ public class EntityStorage implements EntityPersistentStorage<Entity> { + + @Override + public void storeEntities(ChunkEntities<Entity> dataList) { ++ // Paper start - rewrite chunk system ++ if (true) { ++ throw new UnsupportedOperationException(); ++ } ++ // Paper end - rewrite chunk system + ChunkPos chunkPos = dataList.getPos(); + if (dataList.isEmpty()) { + if (this.emptyChunks.add(chunkPos.toLong())) { +- this.simpleRegionStorage.write(chunkPos, null); ++ // Paper - rewrite chunk system - fix compile for unused field in dead code + } + } else { +- ListTag listTag = new ListTag(); +- dataList.getEntities().forEach(entity -> { +- CompoundTag compoundTagx = new CompoundTag(); +- if (entity.save(compoundTagx)) { +- listTag.add(compoundTagx); +- } +- }); +- CompoundTag compoundTag = NbtUtils.addCurrentDataVersion(new CompoundTag()); +- compoundTag.put("Entities", listTag); +- writeChunkPos(compoundTag, chunkPos); +- this.simpleRegionStorage.write(chunkPos, compoundTag).exceptionally(ex -> { +- LOGGER.error("Failed to store chunk {}", chunkPos, ex); +- return null; +- }); ++ // Paper - move into saveEntityChunk0 + this.emptyChunks.remove(chunkPos.toLong()); + } + } + ++ // Paper start - rewrite chunk system ++ public static void copyEntities(final CompoundTag from, final CompoundTag into) { ++ if (from == null) { ++ return; ++ } ++ final ListTag entitiesFrom = from.getList("Entities", net.minecraft.nbt.Tag.TAG_COMPOUND); ++ if (entitiesFrom == null || entitiesFrom.isEmpty()) { ++ return; ++ } ++ ++ final ListTag entitiesInto = into.getList("Entities", net.minecraft.nbt.Tag.TAG_COMPOUND); ++ into.put("Entities", entitiesInto); // this is in case into doesn't have any entities ++ entitiesInto.addAll(0, entitiesFrom.copy()); // need to copy, this is coming from the save thread ++ } ++ ++ public static CompoundTag saveEntityChunk(List<Entity> entities, ChunkPos chunkPos, ServerLevel level) { ++ return saveEntityChunk0(entities, chunkPos, level, false); ++ } ++ private static CompoundTag saveEntityChunk0(List<Entity> entities, ChunkPos chunkPos, ServerLevel level, boolean force) { ++ if (!force && entities.isEmpty()) { ++ return null; ++ } ++ ++ ListTag listTag = new ListTag(); ++ entities.forEach((entity) -> { // diff here: use entities parameter ++ CompoundTag compoundTag = new CompoundTag(); ++ if (entity.save(compoundTag)) { ++ listTag.add(compoundTag); ++ } ++ ++ }); ++ CompoundTag compoundTag = NbtUtils.addCurrentDataVersion(new CompoundTag()); ++ compoundTag.put("Entities", listTag); ++ writeChunkPos(compoundTag, chunkPos); ++ // Paper - remove worker usage ++ ++ return !force && listTag.isEmpty() ? null : compoundTag; ++ } ++ ++ public static CompoundTag upgradeChunkTag(CompoundTag chunkNbt) { ++ int i = NbtUtils.getDataVersion(chunkNbt, -1); ++ return ca.spottedleaf.dataconverter.minecraft.MCDataConverter.convertTag(ca.spottedleaf.dataconverter.minecraft.datatypes.MCTypeRegistry.ENTITY_CHUNK, chunkNbt, i, net.minecraft.SharedConstants.getCurrentVersion().getDataVersion().getVersion()); ++ } ++ // Paper end - rewrite chunk system ++ + @Override + public void flush(boolean sync) { +- this.simpleRegionStorage.synchronize(sync).join(); +- this.entityDeserializerQueue.runAll(); ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + + @Override + public void close() throws IOException { +- this.simpleRegionStorage.close(); ++ throw new UnsupportedOperationException(); // Paper - rewrite chunk system + } + } +diff --git a/src/main/java/net/minecraft/world/level/chunk/storage/RegionFile.java b/src/main/java/net/minecraft/world/level/chunk/storage/RegionFile.java +index e858436bcf1b234d4bc6e6a117f5224d5c2d9f90..307196b2a58d4f8db3e6e3c3517a8004d4908b13 100644 +--- a/src/main/java/net/minecraft/world/level/chunk/storage/RegionFile.java ++++ b/src/main/java/net/minecraft/world/level/chunk/storage/RegionFile.java +@@ -48,6 +48,7 @@ public class RegionFile implements AutoCloseable { + private final IntBuffer timestamps; + @VisibleForTesting + protected final RegionBitmap usedSectors; ++ public final java.util.concurrent.locks.ReentrantLock fileLock = new java.util.concurrent.locks.ReentrantLock(); // Paper + + public RegionFile(RegionStorageInfo storageKey, Path directory, Path path, boolean dsync) throws IOException { + this(storageKey, directory, path, RegionFileVersion.getCompressionFormat(), dsync); // Paper - Configurable region compression format +@@ -250,7 +251,7 @@ public class RegionFile implements AutoCloseable { + return (byteCount + 4096 - 1) / 4096; + } + +- public boolean doesChunkExist(ChunkPos pos) { ++ public synchronized boolean doesChunkExist(ChunkPos pos) { // Paper - synchronized + int i = this.getOffset(pos); + + if (i == 0) { +@@ -417,6 +418,11 @@ public class RegionFile implements AutoCloseable { + } + + public void close() throws IOException { ++ // Paper start - Prevent regionfiles from being closed during use ++ this.fileLock.lock(); ++ synchronized (this) { ++ try { ++ // Paper end + try { + this.padToFullSector(); + } finally { +@@ -426,6 +432,10 @@ public class RegionFile implements AutoCloseable { + this.file.close(); + } + } ++ } finally { // Paper start - Prevent regionfiles from being closed during use ++ this.fileLock.unlock(); ++ } ++ } // Paper end + + } + +diff --git a/src/main/java/net/minecraft/world/level/chunk/storage/RegionFileStorage.java b/src/main/java/net/minecraft/world/level/chunk/storage/RegionFileStorage.java +index c4eef3aade889c69cefd873bec2d031cc54103ea..3f6955be976064eb542b5c50a9d6d74457c1833c 100644 +--- a/src/main/java/net/minecraft/world/level/chunk/storage/RegionFileStorage.java ++++ b/src/main/java/net/minecraft/world/level/chunk/storage/RegionFileStorage.java +@@ -26,31 +26,99 @@ public class RegionFileStorage implements AutoCloseable { + private final Path folder; + private final boolean sync; + +- RegionFileStorage(RegionStorageInfo storageKey, Path directory, boolean dsync) { ++ // Paper start - cache regionfile does not exist state ++ static final int MAX_NON_EXISTING_CACHE = 1024 * 64; ++ private final it.unimi.dsi.fastutil.longs.LongLinkedOpenHashSet nonExistingRegionFiles = new it.unimi.dsi.fastutil.longs.LongLinkedOpenHashSet(); ++ private synchronized boolean doesRegionFilePossiblyExist(long position) { ++ if (this.nonExistingRegionFiles.contains(position)) { ++ this.nonExistingRegionFiles.addAndMoveToFirst(position); ++ return false; ++ } ++ return true; ++ } ++ ++ private synchronized void createRegionFile(long position) { ++ this.nonExistingRegionFiles.remove(position); ++ } ++ ++ private synchronized void markNonExisting(long position) { ++ if (this.nonExistingRegionFiles.addAndMoveToFirst(position)) { ++ while (this.nonExistingRegionFiles.size() >= MAX_NON_EXISTING_CACHE) { ++ this.nonExistingRegionFiles.removeLastLong(); ++ } ++ } ++ } ++ ++ public synchronized boolean doesRegionFileNotExistNoIO(ChunkPos pos) { ++ long key = ChunkPos.asLong(pos.getRegionX(), pos.getRegionZ()); ++ return !this.doesRegionFilePossiblyExist(key); ++ } ++ // Paper end - cache regionfile does not exist state ++ ++ protected RegionFileStorage(RegionStorageInfo storageKey, Path directory, boolean dsync) { // Paper - protected constructor + this.folder = directory; + this.sync = dsync; + this.info = storageKey; + } + +- private RegionFile getRegionFile(ChunkPos chunkcoordintpair, boolean existingOnly) throws IOException { // CraftBukkit +- long i = ChunkPos.asLong(chunkcoordintpair.getRegionX(), chunkcoordintpair.getRegionZ()); ++ // Paper start ++ public synchronized RegionFile getRegionFileIfLoaded(ChunkPos chunkcoordintpair) { ++ return this.regionCache.getAndMoveToFirst(ChunkPos.asLong(chunkcoordintpair.getRegionX(), chunkcoordintpair.getRegionZ())); ++ } ++ ++ public synchronized boolean chunkExists(ChunkPos pos) throws IOException { ++ RegionFile regionfile = getRegionFile(pos, true); ++ ++ return regionfile != null ? regionfile.hasChunk(pos) : false; ++ } ++ ++ public synchronized RegionFile getRegionFile(ChunkPos chunkcoordintpair, boolean existingOnly) throws IOException { // CraftBukkit ++ return this.getRegionFile(chunkcoordintpair, existingOnly, false); ++ } ++ public synchronized RegionFile getRegionFile(ChunkPos chunkcoordintpair, boolean existingOnly, boolean lock) throws IOException { ++ // Paper end ++ long i = ChunkPos.asLong(chunkcoordintpair.getRegionX(), chunkcoordintpair.getRegionZ()); final long regionPos = i; // Paper - OBFHELPER + RegionFile regionfile = (RegionFile) this.regionCache.getAndMoveToFirst(i); + + if (regionfile != null) { ++ // Paper start ++ if (lock) { ++ // must be in this synchronized block ++ regionfile.fileLock.lock(); ++ } ++ // Paper end + return regionfile; + } else { ++ // Paper start - cache regionfile does not exist state ++ if (existingOnly && !this.doesRegionFilePossiblyExist(regionPos)) { ++ return null; ++ } ++ // Paper end - cache regionfile does not exist state + if (this.regionCache.size() >= io.papermc.paper.configuration.GlobalConfiguration.get().misc.regionFileCacheSize) { // Paper - Sanitise RegionFileCache and make configurable + ((RegionFile) this.regionCache.removeLast()).close(); + } + +- FileUtil.createDirectoriesSafe(this.folder); ++ // Paper - only create directory if not existing only - moved down + Path path = this.folder; + int j = chunkcoordintpair.getRegionX(); + Path path1 = path.resolve("r." + j + "." + chunkcoordintpair.getRegionZ() + ".mca"); +- if (existingOnly && !java.nio.file.Files.exists(path1)) return null; // CraftBukkit ++ if (existingOnly && !java.nio.file.Files.exists(path1)) { // Paper start - cache regionfile does not exist state ++ this.markNonExisting(regionPos); ++ return null; // CraftBukkit ++ } else { ++ this.createRegionFile(regionPos); ++ } ++ // Paper end - cache regionfile does not exist state ++ FileUtil.createDirectoriesSafe(this.folder); // Paper - only create directory if not existing only - moved from above + RegionFile regionfile1 = new RegionFile(this.info, path1, this.folder, this.sync); + + this.regionCache.putAndMoveToFirst(i, regionfile1); ++ // Paper start ++ if (lock) { ++ // must be in this synchronized block ++ regionfile1.fileLock.lock(); ++ } ++ // Paper end + return regionfile1; + } + } +@@ -58,11 +126,12 @@ public class RegionFileStorage implements AutoCloseable { + @Nullable + public CompoundTag read(ChunkPos pos) throws IOException { + // CraftBukkit start - SPIGOT-5680: There's no good reason to preemptively create files on read, save that for writing +- RegionFile regionfile = this.getRegionFile(pos, true); ++ RegionFile regionfile = this.getRegionFile(pos, true, true); // Paper + if (regionfile == null) { + return null; + } + // CraftBukkit end ++ try { // Paper + DataInputStream datainputstream = regionfile.getChunkDataInputStream(pos); + + CompoundTag nbttagcompound; +@@ -99,6 +168,9 @@ public class RegionFileStorage implements AutoCloseable { + } + + return nbttagcompound; ++ } finally { // Paper start ++ regionfile.fileLock.unlock(); ++ } // Paper end + } + + public void scanChunk(ChunkPos chunkPos, StreamTagVisitor scanner) throws IOException { +@@ -133,7 +205,13 @@ public class RegionFileStorage implements AutoCloseable { + } + + protected void write(ChunkPos pos, @Nullable CompoundTag nbt) throws IOException { +- RegionFile regionfile = this.getRegionFile(pos, false); // CraftBukkit ++ // Paper start - rewrite chunk system ++ RegionFile regionfile = this.getRegionFile(pos, nbt == null, true); // CraftBukkit ++ if (nbt == null && regionfile == null) { ++ return; ++ } ++ try { // Try finally to unlock the region file ++ // Paper end - rewrite chunk system + // Paper start - Chunk save reattempt + int attempts = 0; + Exception lastException = null; +@@ -179,9 +257,14 @@ public class RegionFileStorage implements AutoCloseable { + net.minecraft.server.MinecraftServer.LOGGER.error("Failed to save chunk {}", pos, lastException); + } + // Paper end - Chunk save reattempt ++ // Paper start - rewrite chunk system ++ } finally { ++ regionfile.fileLock.unlock(); ++ } ++ // Paper end - rewrite chunk system + } + +- public void close() throws IOException { ++ public synchronized void close() throws IOException { // Paper -> synchronized + ExceptionCollector<IOException> exceptionsuppressor = new ExceptionCollector<>(); + ObjectIterator objectiterator = this.regionCache.values().iterator(); + +@@ -198,7 +281,7 @@ public class RegionFileStorage implements AutoCloseable { + exceptionsuppressor.throwIfPresent(); + } + +- public void flush() throws IOException { ++ public synchronized void flush() throws IOException { // Paper - synchronize + ObjectIterator objectiterator = this.regionCache.values().iterator(); + + while (objectiterator.hasNext()) { +diff --git a/src/main/java/net/minecraft/world/level/chunk/storage/SectionStorage.java b/src/main/java/net/minecraft/world/level/chunk/storage/SectionStorage.java +index 151fcbca34e02783e19fbb7b54ec4fbec2eed190..883fbe5c81e3be27007a1a0489f80ba1863e5a04 100644 +--- a/src/main/java/net/minecraft/world/level/chunk/storage/SectionStorage.java ++++ b/src/main/java/net/minecraft/world/level/chunk/storage/SectionStorage.java +@@ -12,6 +12,7 @@ import it.unimi.dsi.fastutil.longs.Long2ObjectMap; + import it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap; + import it.unimi.dsi.fastutil.longs.LongLinkedOpenHashSet; + import java.io.IOException; ++import java.nio.file.Path; + import java.util.Map; + import java.util.Optional; + import java.util.concurrent.CompletableFuture; +@@ -31,25 +32,30 @@ import net.minecraft.world.level.ChunkPos; + import net.minecraft.world.level.LevelHeightAccessor; + import org.slf4j.Logger; + +-public class SectionStorage<R> implements AutoCloseable { ++public class SectionStorage<R> extends RegionFileStorage implements AutoCloseable { // Paper - nuke IOWorker + private static final Logger LOGGER = LogUtils.getLogger(); + private static final String SECTIONS_TAG = "Sections"; +- private final SimpleRegionStorage simpleRegionStorage; ++ // Paper - remove mojang I/O thread + private final Long2ObjectMap<Optional<R>> storage = new Long2ObjectOpenHashMap<>(); + private final LongLinkedOpenHashSet dirty = new LongLinkedOpenHashSet(); + private final Function<Runnable, Codec<R>> codec; + private final Function<Runnable, R> factory; +- private final RegistryAccess registryAccess; ++ public final RegistryAccess registryAccess; // Paper - rewrite chunk system - public + protected final LevelHeightAccessor levelHeightAccessor; + + public SectionStorage( ++ // Paper start ++ RegionStorageInfo regionStorageInfo, ++ Path path, ++ boolean dsync, ++ // Paper end + SimpleRegionStorage storageAccess, + Function<Runnable, Codec<R>> codecFactory, + Function<Runnable, R> factory, + RegistryAccess registryManager, + LevelHeightAccessor world + ) { +- this.simpleRegionStorage = storageAccess; ++ super(regionStorageInfo, path, dsync); // Paper - remove mojang I/O thread + this.codec = codecFactory; + this.factory = factory; + this.registryAccess = registryManager; +@@ -112,23 +118,21 @@ public class SectionStorage<R> implements AutoCloseable { + } + + private void readColumn(ChunkPos pos) { +- Optional<CompoundTag> optional = this.tryRead(pos).join(); +- RegistryOps<Tag> registryOps = this.registryAccess.createSerializationContext(NbtOps.INSTANCE); +- this.readColumn(pos, registryOps, optional.orElse(null)); ++ throw new IllegalStateException("Only chunk system can load in state, offending class:" + this.getClass().getName()); // Paper - rewrite chunk system + } + + private CompletableFuture<Optional<CompoundTag>> tryRead(ChunkPos pos) { +- return this.simpleRegionStorage.read(pos).exceptionally(throwable -> { +- if (throwable instanceof IOException iOException) { +- LOGGER.error("Error reading chunk {} data from disk", pos, iOException); +- return Optional.empty(); +- } else { +- throw new CompletionException(throwable); +- } +- }); ++ // Paper start - rewrite chunk system ++ try { ++ return CompletableFuture.completedFuture(Optional.ofNullable(this.read(pos))); ++ } catch (Throwable thr) { ++ return CompletableFuture.failedFuture(thr); ++ } ++ // Paper end - rewrite chunk system + } + + private void readColumn(ChunkPos pos, RegistryOps<Tag> ops, @Nullable CompoundTag nbt) { ++ if (true) throw new IllegalStateException("Only chunk system can load in state, offending class:" + this.getClass().getName()); // Paper - rewrite chunk system + if (nbt == null) { + for (int i = this.levelHeightAccessor.getMinSection(); i < this.levelHeightAccessor.getMaxSection(); i++) { + this.storage.put(getKey(pos, i), Optional.empty()); +@@ -138,7 +142,7 @@ public class SectionStorage<R> implements AutoCloseable { + int j = getVersion(dynamic); + int k = SharedConstants.getCurrentVersion().getDataVersion().getVersion(); + boolean bl = j != k; +- Dynamic<Tag> dynamic2 = this.simpleRegionStorage.upgradeChunkTag(dynamic, j); ++ Dynamic<Tag> dynamic2 = null; // Paper - rewrite chunk system + OptionalDynamic<Tag> optionalDynamic = dynamic2.get("Sections"); + + for (int l = this.levelHeightAccessor.getMinSection(); l < this.levelHeightAccessor.getMaxSection(); l++) { +@@ -162,7 +166,7 @@ public class SectionStorage<R> implements AutoCloseable { + Dynamic<Tag> dynamic = this.writeColumn(pos, registryOps); + Tag tag = dynamic.getValue(); + if (tag instanceof CompoundTag) { +- this.simpleRegionStorage.write(pos, (CompoundTag)tag); ++ try { this.write(pos, (CompoundTag)tag); } catch (IOException ex) { SectionStorage.LOGGER.error("Error writing poi chunk data to disk for chunk " + pos, ex); } // Paper - nuke IOWorker + } else { + LOGGER.error("Expected compound tag, got {}", tag); + } +@@ -212,7 +216,7 @@ public class SectionStorage<R> implements AutoCloseable { + } + + private static int getVersion(Dynamic<?> dynamic) { +- return dynamic.get("DataVersion").asInt(1945); ++ return dynamic.get("DataVersion").asInt(1945); // Paper - diff on change, constant used in ChunkLoadTask + } + + public void flush(ChunkPos pos) { +@@ -229,6 +233,6 @@ public class SectionStorage<R> implements AutoCloseable { + + @Override + public void close() throws IOException { +- this.simpleRegionStorage.close(); ++ super.close(); // Paper - nuke I/O worker - don't call the worker + } + } +diff --git a/src/main/java/net/minecraft/world/level/entity/EntityTickList.java b/src/main/java/net/minecraft/world/level/entity/EntityTickList.java +index 74a285b8b018a9c94ccea519f1ce8b9e2ef3cb64..83a39f900551e39d5af6f17a339a386ddee4feef 100644 +--- a/src/main/java/net/minecraft/world/level/entity/EntityTickList.java ++++ b/src/main/java/net/minecraft/world/level/entity/EntityTickList.java +@@ -9,52 +9,41 @@ import javax.annotation.Nullable; + import net.minecraft.world.entity.Entity; + + public class EntityTickList { +- private Int2ObjectMap<Entity> active = new Int2ObjectLinkedOpenHashMap<>(); +- private Int2ObjectMap<Entity> passive = new Int2ObjectLinkedOpenHashMap<>(); +- @Nullable +- private Int2ObjectMap<Entity> iterated; ++ private final io.papermc.paper.util.maplist.IteratorSafeOrderedReferenceSet<Entity> entities = new io.papermc.paper.util.maplist.IteratorSafeOrderedReferenceSet<>(true); // Paper - rewrite this, always keep this updated - why would we EVER tick an entity that's not ticking? + + private void ensureActiveIsNotIterated() { +- if (this.iterated == this.active) { +- this.passive.clear(); +- +- for (Entry<Entity> entry : Int2ObjectMaps.fastIterable(this.active)) { +- this.passive.put(entry.getIntKey(), entry.getValue()); +- } +- +- Int2ObjectMap<Entity> int2ObjectMap = this.active; +- this.active = this.passive; +- this.passive = int2ObjectMap; +- } ++ // Paper - replace with better logic, do not delay removals + } + + public void add(Entity entity) { ++ io.papermc.paper.util.TickThread.ensureTickThread("Asynchronous entity ticklist addition"); // Paper + this.ensureActiveIsNotIterated(); +- this.active.put(entity.getId(), entity); ++ this.entities.add(entity); // Paper - replace with better logic, do not delay removals/additions + } + + public void remove(Entity entity) { ++ io.papermc.paper.util.TickThread.ensureTickThread("Asynchronous entity ticklist removal"); // Paper + this.ensureActiveIsNotIterated(); +- this.active.remove(entity.getId()); ++ this.entities.remove(entity); // Paper - replace with better logic, do not delay removals/additions + } + + public boolean contains(Entity entity) { +- return this.active.containsKey(entity.getId()); ++ return this.entities.contains(entity); // Paper - replace with better logic, do not delay removals/additions + } + + public void forEach(Consumer<Entity> action) { +- if (this.iterated != null) { +- throw new UnsupportedOperationException("Only one concurrent iteration supported"); +- } else { +- this.iterated = this.active; +- +- try { +- for (Entity entity : this.active.values()) { +- action.accept(entity); +- } +- } finally { +- this.iterated = null; ++ io.papermc.paper.util.TickThread.ensureTickThread("Asynchronous entity ticklist iteration"); // Paper ++ // Paper start - replace with better logic, do not delay removals/additions ++ // To ensure nothing weird happens with dimension travelling, do not iterate over new entries... ++ // (by dfl iterator() is configured to not iterate over new entries) ++ io.papermc.paper.util.maplist.IteratorSafeOrderedReferenceSet.Iterator<Entity> iterator = this.entities.iterator(); ++ try { ++ while (iterator.hasNext()) { ++ action.accept(iterator.next()); + } ++ } finally { ++ iterator.finishedIterating(); + } ++ // Paper end - replace with better logic, do not delay removals/additions + } + } +diff --git a/src/main/java/net/minecraft/world/level/levelgen/NoiseBasedChunkGenerator.java b/src/main/java/net/minecraft/world/level/levelgen/NoiseBasedChunkGenerator.java +index 5d15c228c044a36c67014793decb314240cf6be1..dc765b92cc90f5f370254e68bbbdfa5add7935ce 100644 +--- a/src/main/java/net/minecraft/world/level/levelgen/NoiseBasedChunkGenerator.java ++++ b/src/main/java/net/minecraft/world/level/levelgen/NoiseBasedChunkGenerator.java +@@ -87,7 +87,7 @@ public final class NoiseBasedChunkGenerator extends ChunkGenerator { + return CompletableFuture.supplyAsync(Util.wrapThreadWithTaskName("init_biomes", () -> { + this.doCreateBiomes(blender, noiseConfig, structureAccessor, chunk); + return chunk; +- }), Util.backgroundExecutor()); ++ }), executor); // Paper - run with supplied executor + } + + private void doCreateBiomes(Blender blender, RandomState noiseConfig, StructureManager structureAccessor, ChunkAccess chunk) { +@@ -286,7 +286,7 @@ public final class NoiseBasedChunkGenerator extends ChunkGenerator { + + return CompletableFuture.supplyAsync(Util.wrapThreadWithTaskName("wgen_fill_noise", () -> { + return this.doFill(blender, structureAccessor, noiseConfig, chunk, j, k); +- }), Util.backgroundExecutor()).whenCompleteAsync((ichunkaccess1, throwable) -> { ++ }), executor).whenCompleteAsync((ichunkaccess1, throwable) -> { // Paper - run with supplied executor + Iterator iterator = set.iterator(); + + while (iterator.hasNext()) { +diff --git a/src/main/java/net/minecraft/world/level/levelgen/structure/StructureCheck.java b/src/main/java/net/minecraft/world/level/levelgen/structure/StructureCheck.java +index 609100ed7aa0b23aa5a9c6fbf6878ea320bd3a93..7068657b28a9bc175ee23f5a18defb41168f1d76 100644 +--- a/src/main/java/net/minecraft/world/level/levelgen/structure/StructureCheck.java ++++ b/src/main/java/net/minecraft/world/level/levelgen/structure/StructureCheck.java +@@ -47,8 +47,101 @@ public class StructureCheck { + private final BiomeSource biomeSource; + private final long seed; + private final DataFixer fixerUpper; +- private final Long2ObjectMap<Object2IntMap<Structure>> loadedChunks = new Long2ObjectOpenHashMap<>(); +- private final Map<Structure, Long2BooleanMap> featureChecks = new HashMap<>(); ++ // Paper start - rewrite chunk system - synchronise this class ++ // additionally, make sure to purge entries from the maps so it does not leak memory ++ private static final int CHUNK_TOTAL_LIMIT = 50 * (2 * 100 + 1) * (2 * 100 + 1); // cache 50 structure lookups ++ private static final int PER_FEATURE_CHECK_LIMIT = 50 * (2 * 100 + 1) * (2 * 100 + 1); // cache 50 structure lookups ++ ++ private final SynchronisedLong2ObjectMap<Object2IntMap<Structure>> loadedChunksSafe = new SynchronisedLong2ObjectMap<>(CHUNK_TOTAL_LIMIT); ++ private final java.util.concurrent.ConcurrentHashMap<Structure, SynchronisedLong2BooleanMap> featureChecksSafe = new java.util.concurrent.ConcurrentHashMap<>(); ++ ++ private static final class SynchronisedLong2ObjectMap<V> { ++ private final it.unimi.dsi.fastutil.longs.Long2ObjectLinkedOpenHashMap<V> map = new it.unimi.dsi.fastutil.longs.Long2ObjectLinkedOpenHashMap<>(); ++ private final int limit; ++ ++ public SynchronisedLong2ObjectMap(final int limit) { ++ this.limit = limit; ++ } ++ ++ // must hold lock on map ++ private void purgeEntries() { ++ while (this.map.size() > this.limit) { ++ this.map.removeLast(); ++ } ++ } ++ ++ public V get(final long key) { ++ synchronized (this.map) { ++ return this.map.getAndMoveToFirst(key); ++ } ++ } ++ ++ public V put(final long key, final V value) { ++ synchronized (this.map) { ++ final V ret = this.map.putAndMoveToFirst(key, value); ++ this.purgeEntries(); ++ return ret; ++ } ++ } ++ ++ public V compute(final long key, final java.util.function.BiFunction<? super Long, ? super V, ? extends V> remappingFunction) { ++ synchronized (this.map) { ++ // first, compute the value - if one is added, it will be at the last entry ++ this.map.compute(key, remappingFunction); ++ // move the entry to first, just in case it was added at last ++ final V ret = this.map.getAndMoveToFirst(key); ++ // now purge the last entries ++ this.purgeEntries(); ++ ++ return ret; ++ } ++ } ++ } ++ ++ private static final class SynchronisedLong2BooleanMap { ++ private final it.unimi.dsi.fastutil.longs.Long2BooleanLinkedOpenHashMap map = new it.unimi.dsi.fastutil.longs.Long2BooleanLinkedOpenHashMap(); ++ private final int limit; ++ ++ public SynchronisedLong2BooleanMap(final int limit) { ++ this.limit = limit; ++ } ++ ++ // must hold lock on map ++ private void purgeEntries() { ++ while (this.map.size() > this.limit) { ++ this.map.removeLastBoolean(); ++ } ++ } ++ ++ public boolean remove(final long key) { ++ synchronized (this.map) { ++ return this.map.remove(key); ++ } ++ } ++ ++ // note: ++ public boolean getOrCompute(final long key, final it.unimi.dsi.fastutil.longs.Long2BooleanFunction ifAbsent) { ++ synchronized (this.map) { ++ if (this.map.containsKey(key)) { ++ return this.map.getAndMoveToFirst(key); ++ } ++ } ++ ++ final boolean put = ifAbsent.get(key); ++ ++ synchronized (this.map) { ++ if (this.map.containsKey(key)) { ++ return this.map.getAndMoveToFirst(key); ++ } ++ this.map.putAndMoveToFirst(key, put); ++ ++ this.purgeEntries(); ++ ++ return put; ++ } ++ } ++ } ++ // Paper end - rewrite chunk system - synchronise this class + + public StructureCheck( + ChunkScanAccess chunkIoWorker, +@@ -90,7 +183,7 @@ public class StructureCheck { + + public StructureCheckResult checkStart(ChunkPos pos, Structure type, StructurePlacement placement, boolean skipReferencedStructures) { + long l = pos.toLong(); +- Object2IntMap<Structure> object2IntMap = this.loadedChunks.get(l); ++ Object2IntMap<Structure> object2IntMap = this.loadedChunksSafe.get(l); // Paper - rewrite chunk system - synchronise this class + if (object2IntMap != null) { + return this.checkStructureInfo(object2IntMap, type, skipReferencedStructures); + } else { +@@ -100,9 +193,9 @@ public class StructureCheck { + } else if (!placement.applyAdditionalChunkRestrictions(pos.x, pos.z, this.seed, this.getSaltOverride(type))) { // Paper - add missing structure seed configs + return StructureCheckResult.START_NOT_PRESENT; + } else { +- boolean bl = this.featureChecks +- .computeIfAbsent(type, structure2 -> new Long2BooleanOpenHashMap()) +- .computeIfAbsent(l, chunkPos -> this.canCreateStructure(pos, type)); ++ boolean bl = this.featureChecksSafe // Paper - rewrite chunk system - synchronise this class ++ .computeIfAbsent(type, structure2 -> new SynchronisedLong2BooleanMap(PER_FEATURE_CHECK_LIMIT)) // Paper - rewrite chunk system - synchronise this class ++ .getOrCompute(l, chunkPos -> this.canCreateStructure(pos, type)); // Paper - rewrite chunk system - synchronise this class + return !bl ? StructureCheckResult.START_NOT_PRESENT : StructureCheckResult.CHUNK_LOAD_NEEDED; + } + } +@@ -228,15 +321,26 @@ public class StructureCheck { + } + + private void storeFullResults(long pos, Object2IntMap<Structure> referencesByStructure) { +- this.loadedChunks.put(pos, deduplicateEmptyMap(referencesByStructure)); +- this.featureChecks.values().forEach(generationPossibilityByChunkPos -> generationPossibilityByChunkPos.remove(pos)); ++ // Paper start - rewrite chunk system - synchronise this class ++ this.loadedChunksSafe.put(pos, deduplicateEmptyMap(referencesByStructure)); ++ // once we insert into loadedChunks, we don't really need to be very careful about removing everything ++ // from this map, as everything that checks this map uses loadedChunks first ++ // so, one way or another it's a race condition that doesn't matter ++ for (SynchronisedLong2BooleanMap value : this.featureChecksSafe.values()) { ++ value.remove(pos); ++ } ++ // Paper end - rewrite chunk system - synchronise this class + } + + public void incrementReference(ChunkPos pos, Structure structure) { +- this.loadedChunks.compute(pos.toLong(), (posx, referencesByStructure) -> { +- if (referencesByStructure == null || referencesByStructure.isEmpty()) { ++ this.loadedChunksSafe.compute(pos.toLong(), (posx, referencesByStructure) -> { // Paper start - rewrite chunk system - synchronise this class ++ // make this COW so that we do not mutate state that may be currently in use ++ if (referencesByStructure == null) { + referencesByStructure = new Object2IntOpenHashMap<>(); ++ } else { ++ referencesByStructure = referencesByStructure instanceof Object2IntOpenHashMap<Structure> fastClone ? fastClone.clone() : new Object2IntOpenHashMap<>(referencesByStructure); + } ++ // Paper end - rewrite chunk system - synchronise this class + + referencesByStructure.computeInt(structure, (feature, references) -> references == null ? 1 : references + 1); + return referencesByStructure; +diff --git a/src/main/java/net/minecraft/world/ticks/LevelChunkTicks.java b/src/main/java/net/minecraft/world/ticks/LevelChunkTicks.java +index 47c2b2da9799690291396effb9e1b06d71efc6fd..2cdd18f724296f10cd4a522d1e8196723d39cf45 100644 +--- a/src/main/java/net/minecraft/world/ticks/LevelChunkTicks.java ++++ b/src/main/java/net/minecraft/world/ticks/LevelChunkTicks.java +@@ -26,6 +26,19 @@ public class LevelChunkTicks<T> implements SerializableTickContainer<T>, TickCon + @Nullable + private BiConsumer<LevelChunkTicks<T>, ScheduledTick<T>> onTickAdded; + ++ // Paper start - add dirty flag ++ private boolean dirty; ++ private long lastSaved = Long.MIN_VALUE; ++ ++ public boolean isDirty(final long tick) { ++ return this.dirty || (!this.tickQueue.isEmpty() && tick != this.lastSaved); ++ } ++ ++ public void clearDirty() { ++ this.dirty = false; ++ } ++ // Paper end - add dirty flag ++ + public LevelChunkTicks() { + } + +@@ -50,6 +63,7 @@ public class LevelChunkTicks<T> implements SerializableTickContainer<T>, TickCon + public ScheduledTick<T> poll() { + ScheduledTick<T> scheduledTick = this.tickQueue.poll(); + if (scheduledTick != null) { ++ this.dirty = true; // Paper - add dirty flag + this.ticksPerPosition.remove(scheduledTick); + } + +@@ -59,6 +73,7 @@ public class LevelChunkTicks<T> implements SerializableTickContainer<T>, TickCon + @Override + public void schedule(ScheduledTick<T> orderedTick) { + if (this.ticksPerPosition.add(orderedTick)) { ++ this.dirty = true; // Paper - add dirty flag + this.scheduleUnchecked(orderedTick); + } + } +@@ -81,7 +96,7 @@ public class LevelChunkTicks<T> implements SerializableTickContainer<T>, TickCon + while (iterator.hasNext()) { + ScheduledTick<T> scheduledTick = iterator.next(); + if (predicate.test(scheduledTick)) { +- iterator.remove(); ++ iterator.remove(); this.dirty = true; // Paper - add dirty flag + this.ticksPerPosition.remove(scheduledTick); + } + } +@@ -98,6 +113,7 @@ public class LevelChunkTicks<T> implements SerializableTickContainer<T>, TickCon + + @Override + public ListTag save(long l, Function<T, String> function) { ++ this.lastSaved = l; // Paper - add dirty system to level ticks + ListTag listTag = new ListTag(); + if (this.pendingTicks != null) { + for (SavedTick<T> savedTick : this.pendingTicks) { +@@ -114,6 +130,11 @@ public class LevelChunkTicks<T> implements SerializableTickContainer<T>, TickCon + + public void unpack(long time) { + if (this.pendingTicks != null) { ++ // Paper start - add dirty system to level chunk ticks ++ if (this.tickQueue.isEmpty()) { ++ this.lastSaved = time; ++ } ++ // Paper end - add dirty system to level chunk ticks + int i = -this.pendingTicks.size(); + + for (SavedTick<T> savedTick : this.pendingTicks) { +diff --git a/src/main/java/org/bukkit/craftbukkit/CraftChunk.java b/src/main/java/org/bukkit/craftbukkit/CraftChunk.java +index 7dae8d91b74cc7df0745f0c121e3bea09b8d0b6d..1e2530c9e5212b6d2bdbc94817beddb4247dac73 100644 +--- a/src/main/java/org/bukkit/craftbukkit/CraftChunk.java ++++ b/src/main/java/org/bukkit/craftbukkit/CraftChunk.java +@@ -115,7 +115,7 @@ public class CraftChunk implements Chunk { + + @Override + public boolean isEntitiesLoaded() { +- return this.getCraftWorld().getHandle().entityManager.areEntitiesLoaded(ChunkPos.asLong(this.x, this.z)); ++ return this.getCraftWorld().getHandle().areEntitiesLoaded(io.papermc.paper.util.CoordinateUtils.getChunkKey(this.x, this.z)); // Paper - rewrite chunk system + } + + @Override +@@ -124,51 +124,7 @@ public class CraftChunk implements Chunk { + this.getWorld().getChunkAt(this.x, this.z); // Transient load for this tick + } + +- PersistentEntitySectionManager<net.minecraft.world.entity.Entity> entityManager = this.getCraftWorld().getHandle().entityManager; +- long pair = ChunkPos.asLong(this.x, this.z); +- +- if (entityManager.areEntitiesLoaded(pair)) { +- return entityManager.getEntities(new ChunkPos(this.x, this.z)).stream() +- .map(net.minecraft.world.entity.Entity::getBukkitEntity) +- .filter(Objects::nonNull).toArray(Entity[]::new); +- } +- +- entityManager.ensureChunkQueuedForLoad(pair); // Start entity loading +- +- // SPIGOT-6772: Use entity mailbox and re-schedule entities if they get unloaded +- ProcessorMailbox<Runnable> mailbox = ((EntityStorage) entityManager.permanentStorage).entityDeserializerQueue; +- BooleanSupplier supplier = () -> { +- // only execute inbox if our entities are not present +- if (entityManager.areEntitiesLoaded(pair)) { +- return true; +- } +- +- if (!entityManager.isPending(pair)) { +- // Our entities got unloaded, this should normally not happen. +- entityManager.ensureChunkQueuedForLoad(pair); // Re-start entity loading +- } +- +- // tick loading inbox, which loads the created entities to the world +- // (if present) +- entityManager.tick(); +- // check if our entities are loaded +- return entityManager.areEntitiesLoaded(pair); +- }; +- +- // now we wait until the entities are loaded, +- // the converting from NBT to entity object is done on the main Thread which is why we wait +- while (!supplier.getAsBoolean()) { +- if (mailbox.size() != 0) { +- mailbox.run(); +- } else { +- Thread.yield(); +- LockSupport.parkNanos("waiting for entity loading", 100000L); +- } +- } +- +- return entityManager.getEntities(new ChunkPos(this.x, this.z)).stream() +- .map(net.minecraft.world.entity.Entity::getBukkitEntity) +- .filter(Objects::nonNull).toArray(Entity[]::new); ++ return this.getCraftWorld().getHandle().getChunkEntities(this.x, this.z); // Paper - rewrite chunk system + } + + @Override +diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java +index 5467a5985eaf159e2a4f19dd5723d05d8f2d598e..66fa93a44a348f9cd300ec0c4a2d09a7a2bf47e1 100644 +--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java ++++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java +@@ -1407,7 +1407,6 @@ public final class CraftServer implements Server { + // Paper - Put world into worldlist before initing the world; move up + + this.getServer().prepareLevels(internal.getChunkSource().chunkMap.progressListener, internal); +- internal.entityManager.tick(); // SPIGOT-6526: Load pending entities so they are available to the API + + this.pluginManager.callEvent(new WorldLoadEvent(internal.getWorld())); + return internal.getWorld(); +@@ -1452,7 +1451,7 @@ public final class CraftServer implements Server { + } + + handle.getChunkSource().close(save); +- handle.entityManager.close(save); // SPIGOT-6722: close entityManager ++ // handle.entityManager.close(save); // SPIGOT-6722: close entityManager // Paper - rewrite chunk system + handle.convertable.close(); + } catch (Exception ex) { + this.getLogger().log(Level.SEVERE, null, ex); +@@ -2488,7 +2487,7 @@ public final class CraftServer implements Server { + + @Override + public boolean isPrimaryThread() { +- return Thread.currentThread().equals(this.console.serverThread) || this.console.hasStopped() || !org.spigotmc.AsyncCatcher.enabled; // All bets are off if we have shut down (e.g. due to watchdog) ++ return io.papermc.paper.util.TickThread.isTickThread(); // Paper - rewrite chunk system + } + + // Paper start - Adventure +diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java +index 4b6a04e47f5d4c071607516519098fab317dcf12..01fc74e6cc8ea8808b821583afb26309587dc003 100644 +--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java ++++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java +@@ -518,10 +518,14 @@ public class CraftWorld extends CraftRegionAccessor implements World { + ChunkHolder playerChunk = this.world.getChunkSource().chunkMap.getVisibleChunkIfPresent(ChunkPos.asLong(x, z)); + if (playerChunk == null) return false; + +- playerChunk.getTickingChunkFuture().thenAccept(either -> { +- either.ifSuccess(chunk -> { ++ // Paper start - rewrite player chunk loader ++ net.minecraft.world.level.chunk.LevelChunk chunk = playerChunk.getSendingChunk(); ++ if (chunk == null) { ++ return false; ++ } ++ // Paper end - rewrite player chunk loader + List<ServerPlayer> playersInRange = playerChunk.playerProvider.getPlayers(playerChunk.getPos(), false); +- if (playersInRange.isEmpty()) return; ++ if (playersInRange.isEmpty()) return true; // Paper - rewrite player chunk loader + + ClientboundLevelChunkWithLightPacket refreshPacket = new ClientboundLevelChunkWithLightPacket(chunk, this.world.getLightEngine(), null, null); + for (ServerPlayer player : playersInRange) { +@@ -529,8 +533,7 @@ public class CraftWorld extends CraftRegionAccessor implements World { + + player.connection.send(refreshPacket); + } +- }); +- }); ++ // Paper - rewrite player chunk loader + + return true; + } +@@ -609,20 +612,7 @@ public class CraftWorld extends CraftRegionAccessor implements World { + @Override + public Collection<Plugin> getPluginChunkTickets(int x, int z) { + DistanceManager chunkDistanceManager = this.world.getChunkSource().chunkMap.distanceManager; +- SortedArraySet<Ticket<?>> tickets = chunkDistanceManager.tickets.get(ChunkPos.asLong(x, z)); +- +- if (tickets == null) { +- return Collections.emptyList(); +- } +- +- ImmutableList.Builder<Plugin> ret = ImmutableList.builder(); +- for (Ticket<?> ticket : tickets) { +- if (ticket.getType() == TicketType.PLUGIN_TICKET) { +- ret.add((Plugin) ticket.key); +- } +- } +- +- return ret.build(); ++ return chunkDistanceManager.getChunkHolderManager().getPluginChunkTickets(x, z); // Paper - rewrite chunk system + } + + @Override +@@ -630,7 +620,7 @@ public class CraftWorld extends CraftRegionAccessor implements World { + Map<Plugin, ImmutableList.Builder<Chunk>> ret = new HashMap<>(); + DistanceManager chunkDistanceManager = this.world.getChunkSource().chunkMap.distanceManager; + +- for (Long2ObjectMap.Entry<SortedArraySet<Ticket<?>>> chunkTickets : chunkDistanceManager.tickets.long2ObjectEntrySet()) { ++ for (Long2ObjectMap.Entry<SortedArraySet<Ticket<?>>> chunkTickets : chunkDistanceManager.getChunkHolderManager().getTicketsCopy().long2ObjectEntrySet()) { // Paper - rewrite chunk system + long chunkKey = chunkTickets.getLongKey(); + SortedArraySet<Ticket<?>> tickets = chunkTickets.getValue(); + +@@ -1327,12 +1317,12 @@ public class CraftWorld extends CraftRegionAccessor implements World { + + @Override + public int getViewDistance() { +- return this.world.getChunkSource().chunkMap.serverViewDistance; ++ return this.getHandle().playerChunkLoader.getAPIViewDistance(); // Paper - replace player chunk loader + } + + @Override + public int getSimulationDistance() { +- return this.world.getChunkSource().chunkMap.getDistanceManager().simulationDistance; ++ return this.getHandle().playerChunkLoader.getAPITickDistance(); // Paper - replace player chunk loader + } + + public BlockMetadataStore getBlockMetadata() { +@@ -2495,17 +2485,20 @@ public class CraftWorld extends CraftRegionAccessor implements World { + + @Override + public void setSimulationDistance(final int simulationDistance) { +- throw new UnsupportedOperationException("Not implemented yet"); ++ if (simulationDistance < 2 || simulationDistance > 32) { ++ throw new IllegalArgumentException("Simulation distance " + simulationDistance + " is out of range of [2, 32]"); ++ } ++ this.getHandle().chunkSource.chunkMap.setTickViewDistance(simulationDistance); + } + + @Override + public int getSendViewDistance() { +- return this.getViewDistance(); ++ return this.getHandle().playerChunkLoader.getAPISendViewDistance(); // Paper - replace player chunk loader + } + + @Override + public void setSendViewDistance(final int viewDistance) { +- throw new UnsupportedOperationException("Not implemented yet"); ++ this.getHandle().chunkSource.chunkMap.setSendViewDistance(viewDistance); // Paper - replace player chunk loader + } + + // Paper start - implement pointers +diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java +index e1af41a8d938420694a5342f08b811615dc46003..33c553d1558b3cdfac22948f3878e1a31d70f02b 100644 +--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java ++++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java +@@ -3457,31 +3457,31 @@ public class CraftPlayer extends CraftHumanEntity implements Player { + + @Override + public int getViewDistance() { +- return io.papermc.paper.chunk.system.ChunkSystem.getLoadViewDistance(this.getHandle()); ++ return io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.getAPIViewDistance(this); + } + + @Override + public void setViewDistance(final int viewDistance) { +- throw new UnsupportedOperationException("Not implemented yet"); ++ this.getHandle().setLoadViewDistance(viewDistance < 0 ? viewDistance : viewDistance + 1); + } + + @Override + public int getSimulationDistance() { +- return io.papermc.paper.chunk.system.ChunkSystem.getTickViewDistance(this.getHandle()); ++ return io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.getAPITickViewDistance(this); + } + + @Override + public void setSimulationDistance(final int simulationDistance) { +- throw new UnsupportedOperationException("Not implemented yet"); ++ this.getHandle().setTickViewDistance(simulationDistance); + } + + @Override + public int getSendViewDistance() { +- return io.papermc.paper.chunk.system.ChunkSystem.getSendViewDistance(this.getHandle()); ++ return io.papermc.paper.chunk.system.RegionizedPlayerChunkLoader.getAPISendViewDistance(this); + } + + @Override + public void setSendViewDistance(final int viewDistance) { +- throw new UnsupportedOperationException("Not implemented yet"); ++ this.getHandle().setSendViewDistance(viewDistance); + } + } +diff --git a/src/main/java/org/bukkit/craftbukkit/generator/CustomChunkGenerator.java b/src/main/java/org/bukkit/craftbukkit/generator/CustomChunkGenerator.java +index b65710b648e31ab74204b5abd9397d9e6e26dac4..c77f722131e0e40e9de29bf8d42f9bc5d8fa2f7d 100644 +--- a/src/main/java/org/bukkit/craftbukkit/generator/CustomChunkGenerator.java ++++ b/src/main/java/org/bukkit/craftbukkit/generator/CustomChunkGenerator.java +@@ -264,7 +264,7 @@ public class CustomChunkGenerator extends InternalChunkGenerator { + return ichunkaccess1; + }; + +- return future == null ? CompletableFuture.supplyAsync(() -> function.apply(chunk), net.minecraft.Util.backgroundExecutor()) : future.thenApply(function); ++ return future == null ? CompletableFuture.supplyAsync(() -> function.apply(chunk), executor) : future.thenApply(function); // Paper - run with supplied executor + } + + @Override +diff --git a/src/main/java/org/bukkit/craftbukkit/util/DelegatedGeneratorAccess.java b/src/main/java/org/bukkit/craftbukkit/util/DelegatedGeneratorAccess.java +index cd7f1309cf01a5f01a28aded03a36fe15adb1756..41a291d42667c38d3e5bbe47236772761e85929b 100644 +--- a/src/main/java/org/bukkit/craftbukkit/util/DelegatedGeneratorAccess.java ++++ b/src/main/java/org/bukkit/craftbukkit/util/DelegatedGeneratorAccess.java +@@ -815,19 +815,39 @@ public abstract class DelegatedGeneratorAccess implements WorldGenLevel { + @Nullable + @Override + public BlockState getBlockStateIfLoaded(final BlockPos blockposition) { +- return null; ++ return this.handle.getBlockStateIfLoaded(blockposition); + } + + @Nullable + @Override + public FluidState getFluidIfLoaded(final BlockPos blockposition) { +- return null; ++ return this.handle.getFluidIfLoaded(blockposition); + } + + @Nullable + @Override + public ChunkAccess getChunkIfLoadedImmediately(final int x, final int z) { +- return null; ++ return this.handle.getChunkIfLoadedImmediately(x, z); ++ } ++ ++ @Override ++ public void getHardCollidingEntities(final Entity except, final AABB box, final Predicate<? super Entity> predicate, final List<Entity> into) { ++ this.handle.getHardCollidingEntities(except, box, predicate, into); ++ } ++ ++ @Override ++ public List<Entity> getHardCollidingEntities(final Entity except, final AABB box, final Predicate<? super Entity> predicate) { ++ return this.handle.getHardCollidingEntities(except, box, predicate); ++ } ++ ++ @Override ++ public void getEntities(final Entity except, final AABB box, final Predicate<? super Entity> predicate, final List<Entity> into) { ++ this.handle.getEntities(except, box, predicate, into); ++ } ++ ++ @Override ++ public <T> void getEntitiesByClass(final Class<? extends T> clazz, final Entity except, final AABB box, final List<? super T> into, final Predicate<? super T> predicate) { ++ this.handle.getEntitiesByClass(clazz, except, box, into, predicate); + } + // Paper end + } +diff --git a/src/main/java/org/bukkit/craftbukkit/util/DummyGeneratorAccess.java b/src/main/java/org/bukkit/craftbukkit/util/DummyGeneratorAccess.java +index e8a73d34dbb372581b03018aade170a31c266099..210f454a840aa5564f7cbf33b83d31aa74814c84 100644 +--- a/src/main/java/org/bukkit/craftbukkit/util/DummyGeneratorAccess.java ++++ b/src/main/java/org/bukkit/craftbukkit/util/DummyGeneratorAccess.java +@@ -268,4 +268,19 @@ public class DummyGeneratorAccess implements WorldGenLevel { + @Override + public void scheduleTick(BlockPos pos, Fluid fluid, int delay, net.minecraft.world.ticks.TickPriority priority) {} + // Paper end - add more methods ++ // Paper start ++ @Override ++ public List<Entity> getHardCollidingEntities(Entity except, AABB box, Predicate<? super Entity> predicate) { ++ return java.util.Collections.emptyList(); ++ } ++ ++ @Override ++ public void getEntities(Entity except, AABB box, Predicate<? super Entity> predicate, List<Entity> into) {} ++ ++ @Override ++ public void getHardCollidingEntities(Entity except, AABB box, Predicate<? super Entity> predicate, List<Entity> into) {} ++ ++ @Override ++ public <T> void getEntitiesByClass(Class<? extends T> clazz, Entity except, AABB box, List<? super T> into, Predicate<? super T> predicate) {} ++ // Paper end + } +diff --git a/src/main/java/org/spigotmc/AsyncCatcher.java b/src/main/java/org/spigotmc/AsyncCatcher.java +index e8e3cc48cf1c58bd8151d1f28df28781859cd0e3..2e074c16dab1ead47914070329da0398c3274048 100644 +--- a/src/main/java/org/spigotmc/AsyncCatcher.java ++++ b/src/main/java/org/spigotmc/AsyncCatcher.java +@@ -9,7 +9,7 @@ public class AsyncCatcher + + public static void catchOp(String reason) + { +- if ( (AsyncCatcher.enabled || io.papermc.paper.util.TickThread.STRICT_THREAD_CHECKS) && Thread.currentThread() != MinecraftServer.getServer().serverThread ) // Paper ++ if (!(io.papermc.paper.util.TickThread.isTickThread())) // Paper + { + MinecraftServer.LOGGER.error("Thread " + Thread.currentThread().getName() + " failed main thread check: " + reason, new Throwable()); // Paper + throw new IllegalStateException( "Asynchronous " + reason + "!" ); +diff --git a/src/main/java/org/spigotmc/WatchdogThread.java b/src/main/java/org/spigotmc/WatchdogThread.java +index ad282d34919716b75acd10426cd071da9d064a51..9e5d08f57aa448552d100ca892c211d44441ef68 100644 +--- a/src/main/java/org/spigotmc/WatchdogThread.java ++++ b/src/main/java/org/spigotmc/WatchdogThread.java +@@ -8,7 +8,7 @@ import java.util.logging.Logger; + import net.minecraft.server.MinecraftServer; + import org.bukkit.Bukkit; + +-public class WatchdogThread extends Thread ++public final class WatchdogThread extends io.papermc.paper.util.TickThread // Paper - rewrite chunk system + { + + private static WatchdogThread instance; +@@ -115,6 +115,7 @@ public class WatchdogThread extends Thread + // Paper end - Different message for short timeout + log.log( Level.SEVERE, "------------------------------" ); + log.log( Level.SEVERE, "Server thread dump (Look for plugins here before reporting to Paper!):" ); // Paper ++ io.papermc.paper.chunk.system.scheduling.ChunkTaskScheduler.dumpAllChunkLoadInfo(isLongTimeout); // Paper - rewrite chunk system + WatchdogThread.dumpThread( ManagementFactory.getThreadMXBean().getThreadInfo( MinecraftServer.getServer().serverThread.getId(), Integer.MAX_VALUE ), log ); + log.log( Level.SEVERE, "------------------------------" ); + // |