Paper/CraftBukkit-Patches/0008-More-Efficient-Chunk-Save-Queue.patch

From c7a1c266931bc601635974cfec17f4b51c766600 Mon Sep 17 00:00:00 2001
From: md_5 <md_5@live.com.au>
Date: Tue, 11 Jun 2013 12:09:45 +1000
Subject: [PATCH] More Efficient Chunk Save Queue

Optimizes the data structures behind the chunk save queue into ones more suitable for the type of data and access which they are used for.

diff --git a/src/main/java/net/minecraft/server/ChunkRegionLoader.java b/src/main/java/net/minecraft/server/ChunkRegionLoader.java
index 527ab42..33bb889 100644
--- a/src/main/java/net/minecraft/server/ChunkRegionLoader.java
+++ b/src/main/java/net/minecraft/server/ChunkRegionLoader.java
@@ -15,8 +15,11 @@ import org.apache.logging.log4j.Logger;
 public class ChunkRegionLoader implements IChunkLoader, IAsyncChunkSaver {
 
     private static final Logger a = LogManager.getLogger();
-    private List b = Lists.newArrayList();
-    private Set c = Sets.newHashSet();
+    // Spigot start
+    private java.util.LinkedHashMap<ChunkCoordIntPair, PendingChunkToSave> pendingSaves = new java.util.LinkedHashMap<ChunkCoordIntPair, PendingChunkToSave>();
+    // private List b = Lists.newArrayList();
+    // private Set c = Sets.newHashSet();
+    // Spigot end
     private Object d = new Object();
     private final File e;
 
@@ -29,13 +32,11 @@ public class ChunkRegionLoader implements IChunkLoader, IAsyncChunkSaver {
         ChunkCoordIntPair chunkcoordintpair = new ChunkCoordIntPair(i, j);
 
         synchronized (this.d) {
-            if (this.c.contains(chunkcoordintpair)) {
-                for (int k = 0; k < this.b.size(); ++k) {
-                    if (((PendingChunkToSave) this.b.get(k)).a.equals(chunkcoordintpair)) {
-                        return true;
-                    }
-                }
-            }
+            // Spigot start
+            if (pendingSaves.containsKey(chunkcoordintpair)) {
+                return true;
+             }
+            // Spigot end
         }
 
         return RegionFileCache.a(this.e, i, j).chunkExists(i & 31, j & 31);
@@ -62,14 +63,12 @@ public class ChunkRegionLoader implements IChunkLoader, IAsyncChunkSaver {
         Object object = this.d;
 
         synchronized (this.d) {
-            if (this.c.contains(chunkcoordintpair)) {
-                for (int k = 0; k < this.b.size(); ++k) {
-                    if (((PendingChunkToSave) this.b.get(k)).a.equals(chunkcoordintpair)) {
-                        nbttagcompound = ((PendingChunkToSave) this.b.get(k)).b;
-                        break;
-                    }
-                }
+            // Spigot start
+            PendingChunkToSave pendingchunktosave = pendingSaves.get(chunkcoordintpair);
+            if (pendingchunktosave != null) {
+                nbttagcompound = pendingchunktosave.b;
             }
+            // Spigot end
         }
 
         if (nbttagcompound == null) {
@@ -150,17 +149,14 @@ public class ChunkRegionLoader implements IChunkLoader, IAsyncChunkSaver {
         Object object = this.d;
 
         synchronized (this.d) {
-            if (this.c.contains(chunkcoordintpair)) {
-                for (int i = 0; i < this.b.size(); ++i) {
-                    if (((PendingChunkToSave) this.b.get(i)).a.equals(chunkcoordintpair)) {
-                        this.b.set(i, new PendingChunkToSave(chunkcoordintpair, nbttagcompound));
-                        return;
-                    }
-                }
+            // Spigot start
+            if (this.pendingSaves.put(chunkcoordintpair, new PendingChunkToSave(chunkcoordintpair, nbttagcompound)) != null) {
+                return;
             }
 
-            this.b.add(new PendingChunkToSave(chunkcoordintpair, nbttagcompound));
-            this.c.add(chunkcoordintpair);
+            // this.b.add(new PendingChunkToSave(chunkcoordintpair, nbttagcompound));
+            // this.c.add(chunkcoordintpair);
+            // Spigot end
             FileIOThread.a().a(this);
         }
     }
@@ -170,12 +166,14 @@ public class ChunkRegionLoader implements IChunkLoader, IAsyncChunkSaver {
         Object object = this.d;
 
         synchronized (this.d) {
-            if (this.b.isEmpty()) {
+            // Spigot start
+            if (this.pendingSaves.isEmpty()) {
                 return false;
             }
 
-            pendingchunktosave = (PendingChunkToSave) this.b.remove(0);
-            this.c.remove(pendingchunktosave.a);
+            pendingchunktosave = this.pendingSaves.values().iterator().next();
+            this.pendingSaves.remove(pendingchunktosave.a);
+            // Spigot end
         }
 
         if (pendingchunktosave != null) {
-- 
2.1.0