Optimize NavigationListener

Spigot-Server-Patches/0078-Optimize-NavigationListener.patch

@@ -0,0 +1,48 @@
+From 18aa79ba6e1de6ef27606f71a06aa35768470161 Mon Sep 17 00:00:00 2001
+From: Aikar <aikar@aikar.co>
+Date: Mon, 7 Mar 2016 20:41:27 -0500
+Subject: [PATCH] Optimize NavigationListener
+
+I believe Mojang intended to call the NavigationListener Block Update
+method anytime a block is changed, but accidently added it for every
+block physics event instead.
+
+This code is massively ineffecient, and physics is so super hot, it
+destroys server performance.
+
+This patch moves the block update call to setTypeAndData instead of
+on Physics.
+
+diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
+index 1db5334..cae2873 100644
+--- a/src/main/java/net/minecraft/server/World.java
++++ b/src/main/java/net/minecraft/server/World.java
+@@ -89,7 +89,7 @@ public abstract class World implements IBlockAccess {
+     private int K;
+     public final Random random = new Random();
+     public WorldProvider worldProvider;
+-    protected NavigationListener t = new NavigationListener();
++    protected NavigationListener t = new NavigationListener(); public NavigationListener getNavListener() { return this.t; } // Paper
+     protected List<IWorldAccess> u;
+     protected IChunkProvider chunkProvider;
+     protected final IDataManager dataManager;
+@@ -168,7 +168,7 @@ public abstract class World implements IBlockAccess {
+         this.ticksPerAnimalSpawns = this.getServer().getTicksPerAnimalSpawns(); // CraftBukkit
+         this.ticksPerMonsterSpawns = this.getServer().getTicksPerMonsterSpawns(); // CraftBukkit
+         // CraftBukkit end
+-        this.u = Lists.newArrayList(new IWorldAccess[] { this.t});
++        this.u = Lists.newArrayList(new IWorldAccess[] {}); // Paper
+         this.L = Calendar.getInstance();
+         this.scoreboard = new Scoreboard();
+         this.allowMonsters = true;
+@@ -412,6 +412,7 @@ public abstract class World implements IBlockAccess {
+                 if (!this.captureBlockStates) { // Don't notify clients or update physics while capturing blockstates
+                     // Modularize client and physic updates
+                     notifyAndUpdatePhysics(blockposition, chunk, iblockdata1, iblockdata, i);
++                    this.getNavListener().a(this, blockposition, iblockdata1, iblockdata, i); // Paper
+                 }
+                 // CraftBukkit end
+ 
+-- 
+2.7.2
+