PaperMC/removed/1.15/0417-Avoid-Chunk-Lookups-for-Entity-TileEntity-Current-Ch.patch

From 95da400b09518a7f98754568f41aca73afddb92a 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 2c92d3390a..3c3a504991 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -789,7 +789,7 @@ 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()));
@@ -828,8 +828,11 @@ 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
                 }
             }
         }
@@ -849,8 +852,8 @@ 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