Rewrite chunk system (#8177)

Patch documentation to come

Issues with the old system that are fixed now:
- World generation does not scale with cpu cores effectively.
- Relies on the main thread for scheduling and maintaining chunk state, dropping chunk load/generate rates at lower tps.
- Unreliable prioritisation of chunk gen/load calls that block the main thread.
- Shutdown logic is utterly unreliable, as it has to wait for all chunks to unload - is it guaranteed that the chunk system is in a state on shutdown that it can reliably do this? Watchdog shutdown also typically failed due to thread checks, which is now resolved.
- Saving of data is not unified (i.e can save chunk data without saving entity data, poses problems for desync if shutdown is really abnormal.
- Entities are not loaded with chunks. This caused quite a bit of headache for Chunk#getEntities API, but now the new chunk system loads entities with chunks so that they are ready whenever the chunk loads in. Effectively brings the behavior back to 1.16 era, but still storing entities in their own separate regionfiles.

The above list is not complete. The patch documentation will complete it.

New chunk system hard relies on starlight and dataconverter, and most importantly the new concurrent utilities in ConcurrentUtil.

Some of the old async chunk i/o interface (i.e the old file io thread reroutes _some_ calls to the new file io thread) is kept for plugin compat reasons. It will be removed in the next major version of minecraft.

The old legacy chunk system patches have been moved to the removed folder in case we need them again.

1 files changed, 56 insertions, 0 deletions

diff --git a/patches/server/0208-Make-shield-blocking-delay-configurable.patch b/patches/server/0208-Make-shield-blocking-delay-configurable.patch
new file mode 100644
index 0000000000..a1c2cf0105
--- /dev/null
+++ b/patches/server/0208-Make-shield-blocking-delay-configurable.patch
@@ -0,0 +1,56 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: BillyGalbreath <[email protected]>
+Date: Sat, 16 Jun 2018 01:18:16 -0500
+Subject: [PATCH] Make shield blocking delay configurable
+
+
+diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
+index 2eb002d6231dcb2a4bf4b1eb96ca4ecdb6d4bca2..3f2bf9e04b20b74a61d2cf1cadbecd36002d0edc 100644
+--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
++++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
+@@ -3722,12 +3722,24 @@ public abstract class LivingEntity extends Entity {
+         if (this.isUsingItem() && !this.useItem.isEmpty()) {
+             Item item = this.useItem.getItem();
+ 
+-            return item.getUseAnimation(this.useItem) != UseAnim.BLOCK ? false : item.getUseDuration(this.useItem) - this.useItemRemaining >= 5;
++            return item.getUseAnimation(this.useItem) != UseAnim.BLOCK ? false : item.getUseDuration(this.useItem) - this.useItemRemaining >= getShieldBlockingDelay(); // Paper - shieldBlockingDelay
+         } else {
+             return false;
+         }
+     }
+ 
++    // Paper start
++    public int shieldBlockingDelay = level.paperConfig().misc.shieldBlockingDelay;
++
++    public int getShieldBlockingDelay() {
++        return shieldBlockingDelay;
++    }
++
++    public void setShieldBlockingDelay(int shieldBlockingDelay) {
++        this.shieldBlockingDelay = shieldBlockingDelay;
++    }
++    // Paper end
++
+     public boolean isSuppressingSlidingDownLadder() {
+         return this.isShiftKeyDown();
+     }
+diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
+index a08fd99fb97d8c880c855e6af2a99afcfa8098b5..80efb900e37069f4ff39c35d39456959ca24bfe8 100644
+--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
++++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
+@@ -785,5 +785,15 @@ public class CraftLivingEntity extends CraftEntity implements LivingEntity {
+     public void setArrowsStuck(int arrows) {
+         getHandle().setArrowCount(arrows);
+     }
++
++    @Override
++    public int getShieldBlockingDelay() {
++        return getHandle().getShieldBlockingDelay();
++    }
++
++    @Override
++    public void setShieldBlockingDelay(int delay) {
++        getHandle().setShieldBlockingDelay(delay);
++    }
+     // Paper end
+ }