PaperMC/CraftBukkit-Patches/0038-Save-entity-counts-for-randomly-spawned-creatures-to.patch

From b5e5145a64d772c22a4b0967dfdd31bec35e3f95 Mon Sep 17 00:00:00 2001
From: Ammar Askar <ammar@ammaraskar.com>
Date: Sat, 20 Apr 2013 12:26:20 +0500
Subject: [PATCH] Save entity counts for randomly spawned creatures to avoid
 repeatedly traversing over the entity slices


diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
index 7416edc..958b5af 100644
--- a/src/main/java/net/minecraft/server/Chunk.java
+++ b/src/main/java/net/minecraft/server/Chunk.java
@@ -9,6 +9,7 @@ import java.util.Map;
 import java.util.Random;
 
 import org.bukkit.Bukkit; // CraftBukkit
+import gnu.trove.map.hash.TObjectIntHashMap; // Spigot
 
 public class Chunk {
 
@@ -33,6 +34,7 @@ public class Chunk {
     public int p;
     private int u;
     boolean q;
+    protected TObjectIntHashMap<Class> entityCount = new TObjectIntHashMap<Class>(); // Spigot
 
     public Chunk(World world, int i, int j) {
         this.sections = new ChunkSection[16];
@@ -560,6 +562,13 @@ public class Chunk {
         entity.ak = k;
         entity.al = this.z;
         this.entitySlices[k].add(entity);
+        // Spigot start - increment creature type count
+        for (EnumCreatureType creatureType : EnumCreatureType.values()) {
+            if (creatureType.a().isAssignableFrom(entity.getClass())) {
+                this.entityCount.adjustOrPutValue(creatureType.a(), 1, 1);
+            }
+        }
+        // Spigot end
     }
 
     public void b(Entity entity) {
@@ -576,6 +585,13 @@ public class Chunk {
         }
 
         this.entitySlices[i].remove(entity);
+        // Spigot start - decrement creature type count
+        for (EnumCreatureType creatureType : EnumCreatureType.values()) {
+            if (creatureType.a().isAssignableFrom(entity.getClass())) {
+                this.entityCount.adjustValue(creatureType.a(), -1);
+            }
+        }
+        // Spigot end
     }
 
     public boolean d(int i, int j, int k) {
diff --git a/src/main/java/net/minecraft/server/SpawnerCreature.java b/src/main/java/net/minecraft/server/SpawnerCreature.java
index 3529074..25b83f7 100644
--- a/src/main/java/net/minecraft/server/SpawnerCreature.java
+++ b/src/main/java/net/minecraft/server/SpawnerCreature.java
@@ -33,14 +33,8 @@ public final class SpawnerCreature {
         for (Long coord : b.keySet()) {
             int x = LongHash.msw(coord);
             int z = LongHash.lsw(coord);
-            if (!server.chunkProviderServer.unloadQueue.contains(x,z) && server.isChunkLoaded(x, z)) {
-                for (List<Entity> entitySlice : server.getChunkAt(x, z).entitySlices) {
-                    for (Entity entity : entitySlice) {
-                        if (oClass.isAssignableFrom(entity.getClass())) {
-                            ++i;
-                        }
-                    }
-                }
+            if (!server.chunkProviderServer.unloadQueue.contains(coord) && server.isChunkLoaded(x, z)) {
+                i += server.getChunkAt(x, z).entityCount.get(oClass);
             }
         }
         return i;
-- 
1.8.2.1