From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Wed, 13 Apr 2016 00:25:28 -0400
Subject: [PATCH] Remove unused World Tile Entity List

Massive hit to performance and it is completely unnecessary.

Removed during 1.17 update - no longer logically applies
not true? blockEntityTickers and pendingBlockEntityTickers have similar logic applied to them

diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
index f7eddb39985072afeb79ec0cbfc084d7e84638e6..bb99d9fe5e274318d8480a6de2c45b0a57351f77 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -1715,7 +1715,7 @@ public class ServerLevel extends net.minecraft.world.level.Level implements Worl
             }
 
             bufferedwriter.write(String.format("entities: %d\n", this.entitiesById.size()));
-            bufferedwriter.write(String.format("block_entities: %d\n", this.blockEntityList.size()));
+            bufferedwriter.write(String.format("block_entities: %d\n", this.tickableBlockEntities.size())); // Paper - remove unused list
             bufferedwriter.write(String.format("block_ticks: %d\n", this.getBlockTicks().size()));
             bufferedwriter.write(String.format("fluid_ticks: %d\n", this.getLiquidTicks().size()));
             bufferedwriter.write("distance_manager: " + playerchunkmap.getDistanceManager().getDebugStatus() + "\n");
@@ -1854,7 +1854,7 @@ public class ServerLevel extends net.minecraft.world.level.Level implements Worl
 
     private void dumpBlockEntities(Writer writer) throws IOException {
         CsvOutput csvwriter = CsvOutput.builder().addColumn("x").addColumn("y").addColumn("z").addColumn("type").build(writer);
-        Iterator iterator = this.blockEntityList.iterator();
+        Iterator iterator = this.tickableBlockEntities.iterator(); // Paper - remove unused list
 
         while (iterator.hasNext()) {
             BlockEntity tileentity = (BlockEntity) iterator.next();
diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
index 89a6a0b4235cfcc1d3ad68ff59a21fa60df4508f..8f0fec38b482465285057d3fd27d456cf036f2fd 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -91,7 +91,7 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
     public static final ResourceKey<Level> NETHER = ResourceKey.create(Registry.DIMENSION_REGISTRY, new ResourceLocation("the_nether"));
     public static final ResourceKey<Level> END = ResourceKey.create(Registry.DIMENSION_REGISTRY, new ResourceLocation("the_end"));
     private static final Direction[] DIRECTIONS = Direction.values();
-    public final List<BlockEntity> blockEntityList = Lists.newArrayList();
+    //public final List<TileEntity> tileEntityList = Lists.newArrayList(); // Paper - remove unused list
     public final List<BlockEntity> tickableBlockEntities = Lists.newArrayList();
     protected final List<BlockEntity> pendingBlockEntities = Lists.newArrayList();
     protected final java.util.Set<BlockEntity> tileEntityListUnload = com.google.common.collect.Sets.newHashSet();
@@ -683,9 +683,9 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
                     }, blockEntity::getBlockPos});
         }
 
-        boolean flag = this.blockEntityList.add(blockEntity);
+        boolean flag = true; // Paper - remove unused list
 
-        if (flag && blockEntity instanceof TickableBlockEntity) {
+        if (flag && blockEntity instanceof TickableBlockEntity && !this.tickableBlockEntities.contains(blockEntity)) { // Paper
             this.tickableBlockEntities.add(blockEntity);
         }
 
@@ -721,7 +721,7 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
         timings.tileEntityTick.startTiming(); // Spigot
         if (!this.tileEntityListUnload.isEmpty()) {
             this.tickableBlockEntities.removeAll(this.tileEntityListUnload);
-            this.blockEntityList.removeAll(this.tileEntityListUnload);
+            //this.tileEntityList.removeAll(this.tileEntityListUnload); // Paper - remove unused list
             this.tileEntityListUnload.clear();
         }
 
@@ -781,7 +781,7 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
                 tilesThisCycle--;
                 this.tickableBlockEntities.remove(tileTickPosition--);
                 // Spigot end
-                this.blockEntityList.remove(tileentity);
+                //this.tileEntityList.remove(tileentity); // Paper - remove unused list
                 if (this.hasChunkAt(tileentity.getBlockPos())) {
                     this.getChunkAt(tileentity.getBlockPos()).removeBlockEntity(tileentity.getBlockPos());
                 }
@@ -811,7 +811,7 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
                         this.sendBlockUpdated(tileentity1.getBlockPos(), iblockdata, iblockdata, 3);
                         // CraftBukkit start
                         // From above, don't screw this up - SPIGOT-1746
-                        if (!this.blockEntityList.contains(tileentity1)) {
+                        if (true) { // Paper - remove unused list
                             this.addBlockEntity(tileentity1);
                         }
                         // CraftBukkit end
@@ -957,7 +957,7 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
         } else {
             if (tileentity != null) {
                 this.pendingBlockEntities.remove(tileentity);
-                this.blockEntityList.remove(tileentity);
+                //this.tileEntityList.remove(tileentity); // Paper - remove unused list
                 this.tickableBlockEntities.remove(tileentity);
             }