papermc/Spigot-Server-Patches/0416-Avoid-Chunk-Lookups-for-Entity-TileEntity-Current-Ch.patch

From e9ded59f2d2f5dfeaa0c9997ba6478a3f7b1bc59 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Wed, 4 Jul 2018 03:39:51 -0400
Subject: [PATCH] Avoid Chunk Lookups for Entity/TileEntity Current Chunk

SPECIAL 1.14.1 NOTE:
This patch caused a memory leak since the tile entity's chunk was set to null
before it was removed. Ensure this issue is resolved!

In many places where we simply want the current chunk the entity
is in, instead of doing a hashmap lookup for it, we now have access
to the object directly on the Entity/TileEntity object we can directly grab.

Use that local value instead to reduce lookups in many hot places.

diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 0baa884bbf..373ea71e64 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -784,7 +784,7 @@ public abstract class World implements GeneratorAccess, AutoCloseable {
             if (!tileentity.isRemoved() && tileentity.hasWorld()) {
                 BlockPosition blockposition = tileentity.getPosition();
 
-                if (this.chunkProvider.a(blockposition) && this.getWorldBorder().a(blockposition)) {
+                if (tileentity.getCurrentChunk() != null && this.getWorldBorder().a(blockposition)) { // Paper
                     try {
                         gameprofilerfiller.a(() -> {
                             return String.valueOf(TileEntityTypes.a(tileentity.getTileType()));
@@ -823,8 +823,11 @@ public abstract class World implements GeneratorAccess, AutoCloseable {
                 this.tileEntityListTick.remove(tileTickPosition--);
                 // Spigot end
                 //this.tileEntityList.remove(tileentity); // Paper - remove unused list
-                if (this.isLoaded(tileentity.getPosition())) {
-                    this.getChunkAtWorldCoords(tileentity.getPosition()).removeTileEntity(tileentity.getPosition());
+                // Paper start - use local chunk reference
+                Chunk chunk = tileentity.getCurrentChunk();
+                if (chunk != null) {
+                    chunk.removeTileEntity(tileentity.getPosition());
+                // Paper end
                 }
             }
         }
@@ -844,8 +847,8 @@ public abstract class World implements GeneratorAccess, AutoCloseable {
                     }
                     // CraftBukkit end */
 
-                    if (this.isLoaded(tileentity1.getPosition())) {
-                        Chunk chunk = this.getChunkAtWorldCoords(tileentity1.getPosition());
+                    Chunk chunk = tileentity1.getCurrentChunk(); // Paper
+                    if (chunk != null) { // Paper
                         IBlockData iblockdata = chunk.getType(tileentity1.getPosition());
 
                         chunk.setTileEntity(tileentity1.getPosition(), tileentity1);
diff --git a/src/main/java/net/minecraft/server/WorldServer.java b/src/main/java/net/minecraft/server/WorldServer.java
index 3739a95c5a..1e00908671 100644
--- a/src/main/java/net/minecraft/server/WorldServer.java
+++ b/src/main/java/net/minecraft/server/WorldServer.java
@@ -1390,9 +1390,12 @@ public class WorldServer extends World {
     }
 
     private void removeEntityFromChunk(Entity entity) {
-        IChunkAccess ichunkaccess = this.getChunkAt(entity.chunkX, entity.chunkZ, ChunkStatus.FULL, false);
+        // Paper start
+        if (!entity.inChunk) return;
+        IChunkAccess ichunkaccess = this.getChunkIfLoaded(entity.chunkX, entity.chunkZ);
+        // Paper start
 
-        if (ichunkaccess instanceof Chunk) {
+        if (ichunkaccess != null) { // Paper
             ((Chunk) ichunkaccess).b(entity);
         }
 
-- 
2.24.1