Re-add fastutil map to Chunk map. Amaranth confirmed its faster by 3x

Spigot-Server-Patches/0121-Use-FastUtil-Int-HashMap-for-DataWatcher.patch

@@ -1,33 +0,0 @@
-From 005dac3ad5e821f19272ed003a8b4df9aac6e56f Mon Sep 17 00:00:00 2001
-From: Aikar <aikar@aikar.co>
-Date: Wed, 30 Mar 2016 02:13:24 -0400
-Subject: [PATCH] Use FastUtil Int HashMap for DataWatcher
-
-For DataWatcher, swap out plain Integer key HashMap for a Int2ObjectOpenHashMap
-
-These collections are super fast as seen
-http://java-performance.info/hashmap-overview-jdk-fastutil-goldman-sachs-hppc-koloboke-trove-january-2015/
-
-diff --git a/src/main/java/net/minecraft/server/DataWatcher.java b/src/main/java/net/minecraft/server/DataWatcher.java
-index f1c62ec..68a0565 100644
---- a/src/main/java/net/minecraft/server/DataWatcher.java
-+++ b/src/main/java/net/minecraft/server/DataWatcher.java
-@@ -11,13 +11,14 @@ import java.util.List;
- import java.util.Map;
- import java.util.concurrent.locks.ReadWriteLock;
- import java.util.concurrent.locks.ReentrantReadWriteLock;
-+import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap; // Paper
- import org.apache.commons.lang3.ObjectUtils;
- 
- public class DataWatcher {
- 
-     private static final Map<Class<? extends Entity>, Integer> a = Maps.newHashMap();
-     private final Entity b;
--    private final Map<Integer, DataWatcher.Item<?>> c = Maps.newHashMap();
-+    private final Map<Integer, DataWatcher.Item<?>> c = new Int2ObjectOpenHashMap<>(); // Paper
-     private final ReadWriteLock d = new ReentrantReadWriteLock();
-     private boolean e = true;
-     private boolean f;
--- 
-2.8.0
-

Spigot-Server-Patches/0121-Use-Optimized-Collections.patch

@@ -0,0 +1,57 @@
+From d07ba0d59c2b9be2696a4828c94fa060bca16a4d Mon Sep 17 00:00:00 2001
+From: Aikar <aikar@aikar.co>
+Date: Wed, 30 Mar 2016 02:13:24 -0400
+Subject: [PATCH] Use Optimized Collections For DataWatcher, swap out plain
+ Integer key HashMap for a Int2ObjectOpenHashMap For ChunkProviderServer, swap
+ out CraftBukkit LongObjectHashMap with Long2ObjectOpenHashMap
+
+Amaranth, the creator of LongObjectHashMap, tested it vs fastutil and determined fastutil to be 3x faster
+and could not create anything faster than fastutil.
+
+These collections are super fast as seen
+http://java-performance.info/hashmap-overview-jdk-fastutil-goldman-sachs-hppc-koloboke-trove-january-2015/
+
+diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
+index 3a1ee86..d112216 100644
+--- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
++++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
+@@ -5,6 +5,7 @@ import java.util.Iterator;
+ import java.util.List;
+ 
+ import com.destroystokyo.paper.exception.ServerInternalException;
++import it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap;
+ import org.apache.logging.log4j.LogManager;
+ import org.apache.logging.log4j.Logger;
+ 
+@@ -26,7 +27,7 @@ public class ChunkProviderServer implements IChunkProvider {
+     private final IChunkLoader chunkLoader;
+     // Paper start
+     protected Chunk lastChunkByPos = null;
+-    public LongObjectHashMap<Chunk> chunks = new LongObjectHashMap<Chunk>() {
++    public Long2ObjectOpenHashMap<Chunk> chunks = new Long2ObjectOpenHashMap<Chunk>() {
+         @Override
+         public Chunk get(long key) {
+             if (lastChunkByPos != null && key == lastChunkByPos.chunkKey) {
+diff --git a/src/main/java/net/minecraft/server/DataWatcher.java b/src/main/java/net/minecraft/server/DataWatcher.java
+index f1c62ec..68a0565 100644
+--- a/src/main/java/net/minecraft/server/DataWatcher.java
++++ b/src/main/java/net/minecraft/server/DataWatcher.java
+@@ -11,13 +11,14 @@ import java.util.List;
+ import java.util.Map;
+ import java.util.concurrent.locks.ReadWriteLock;
+ import java.util.concurrent.locks.ReentrantReadWriteLock;
++import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap; // Paper
+ import org.apache.commons.lang3.ObjectUtils;
+ 
+ public class DataWatcher {
+ 
+     private static final Map<Class<? extends Entity>, Integer> a = Maps.newHashMap();
+     private final Entity b;
+-    private final Map<Integer, DataWatcher.Item<?>> c = Maps.newHashMap();
++    private final Map<Integer, DataWatcher.Item<?>> c = new Int2ObjectOpenHashMap<>(); // Paper
+     private final ReadWriteLock d = new ReentrantReadWriteLock();
+     private boolean e = true;
+     private boolean f;
+-- 
+2.8.0
+