1 files changed, 81 insertions, 0 deletions
diff --git a/paper-server/patches/features/0023-Entity-load-save-limit-per-chunk.patch b/paper-server/patches/features/0023-Entity-load-save-limit-per-chunk.patch
new file mode 100644
index 0000000000..7f3828e1a2
--- /dev/null
+++ b/paper-server/patches/features/0023-Entity-load-save-limit-per-chunk.patch
@@ -0,0 +1,81 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Jason Penilla <[email protected]>
+Date: Wed, 18 Nov 2020 20:52:25 -0800
+Subject: [PATCH] Entity load/save limit per chunk
+
+Adds a config option to limit the number of entities saved and loaded
+to a chunk. The default values of -1 disable the limit. Although
+defaults are only included for certain entites, this allows setting
+limits for any entity type.
+
+diff --git a/ca/spottedleaf/moonrise/patches/chunk_system/level/entity/ChunkEntitySlices.java b/ca/spottedleaf/moonrise/patches/chunk_system/level/entity/ChunkEntitySlices.java
+index 7aea4e343581b977d11af90f9f65eac3532eade1..d21ce54ebb5724c04eadf56a2cde701d5eeb5db2 100644
+--- a/ca/spottedleaf/moonrise/patches/chunk_system/level/entity/ChunkEntitySlices.java
++++ b/ca/spottedleaf/moonrise/patches/chunk_system/level/entity/ChunkEntitySlices.java
+@@ -104,7 +104,18 @@ public final class ChunkEntitySlices {
+         }
+ 
+         final ListTag entitiesTag = new ListTag();
++        final java.util.Map<net.minecraft.world.entity.EntityType<?>, Integer> savedEntityCounts = new java.util.HashMap<>(); // Paper - Entity load/save limit per chunk
+         for (final Entity entity : PlatformHooks.get().modifySavedEntities(world, chunkPos.x, chunkPos.z, entities)) {
++            // Paper start - Entity load/save limit per chunk
++            final EntityType<?> entityType = entity.getType();
++            final int saveLimit = world.paperConfig().chunks.entityPerChunkSaveLimit.getOrDefault(entityType, -1);
++            if (saveLimit > -1) {
++                if (savedEntityCounts.getOrDefault(entityType, 0) >= saveLimit) {
++                    continue;
++                }
++                savedEntityCounts.merge(entityType, 1, Integer::sum);
++            }
++            // Paper end - Entity load/save limit per chunk
+             CompoundTag compoundTag = new CompoundTag();
+             if (entity.save(compoundTag)) {
+                 entitiesTag.add(compoundTag);
+diff --git a/net/minecraft/world/entity/EntityType.java b/net/minecraft/world/entity/EntityType.java
+index 73cdfa5a315ed259b38dfa946a0b7955d9ac9f50..49201d6664656ebe34c84c1c84b5ea4878729062 100644
+--- a/net/minecraft/world/entity/EntityType.java
++++ b/net/minecraft/world/entity/EntityType.java
+@@ -1420,9 +1420,20 @@ public class EntityType<T extends Entity> implements FeatureElement, EntityTypeT
+     public static Stream<Entity> loadEntitiesRecursive(final List<? extends Tag> entityTags, final Level level, final EntitySpawnReason spawnReason) {
+         final Spliterator<? extends Tag> spliterator = entityTags.spliterator();
+         return StreamSupport.stream(new Spliterator<Entity>() {
++            final java.util.Map<EntityType<?>, Integer> loadedEntityCounts = new java.util.HashMap<>(); // Paper - Entity load/save limit per chunk
+             @Override
+             public boolean tryAdvance(Consumer<? super Entity> consumer) {
+                 return spliterator.tryAdvance(tag -> EntityType.loadEntityRecursive((CompoundTag)tag, level, spawnReason, entity -> {
++                        // Paper start - Entity load/save limit per chunk
++                        final EntityType<?> entityType = entity.getType();
++                        final int saveLimit = level.paperConfig().chunks.entityPerChunkSaveLimit.getOrDefault(entityType, -1);
++                        if (saveLimit > -1) {
++                            if (this.loadedEntityCounts.getOrDefault(entityType, 0) >= saveLimit) {
++                                return null;
++                            }
++                            this.loadedEntityCounts.merge(entityType, 1, Integer::sum);
++                        }
++                        // Paper end - Entity load/save limit per chunk
+                     consumer.accept(entity);
+                     return entity;
+                 }));
+diff --git a/net/minecraft/world/level/chunk/storage/EntityStorage.java b/net/minecraft/world/level/chunk/storage/EntityStorage.java
+index da05fb780c55381a7a08ced51d01764a645740b2..2856206eafddfcbcc1b65408deda40357f43a6f8 100644
+--- a/net/minecraft/world/level/chunk/storage/EntityStorage.java
++++ b/net/minecraft/world/level/chunk/storage/EntityStorage.java
+@@ -93,7 +93,18 @@ public class EntityStorage implements EntityPersistentStorage<Entity> {
+             }
+         } else {
+             ListTag listTag = new ListTag();
++            final java.util.Map<net.minecraft.world.entity.EntityType<?>, Integer> savedEntityCounts = new java.util.HashMap<>(); // Paper - Entity load/save limit per chunk
+             entities.getEntities().forEach(entity -> {
++                // Paper start - Entity load/save limit per chunk
++                final EntityType<?> entityType = entity.getType();
++                final int saveLimit = this.level.paperConfig().chunks.entityPerChunkSaveLimit.getOrDefault(entityType, -1);
++                if (saveLimit > -1) {
++                    if (savedEntityCounts.getOrDefault(entityType, 0) >= saveLimit) {
++                        return;
++                    }
++                    savedEntityCounts.merge(entityType, 1, Integer::sum);
++                }
++                // Paper end - Entity load/save limit per chunk
+                 CompoundTag compoundTag1 = new CompoundTag();
+                 if (entity.save(compoundTag1)) {
+                     listTag.add(compoundTag1);