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

From ab91f465135140c44a48dc5e8dee0f3d8d0feaf4 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 9402f0f..ea45af2 100644
--- a/src/main/java/net/minecraft/server/ChunkRegionLoader.java
+++ b/src/main/java/net/minecraft/server/ChunkRegionLoader.java
@@ -15,6 +15,7 @@ import org.apache.logging.log4j.Logger;
 
 public class ChunkRegionLoader implements IChunkLoader, IAsyncChunkSaver {
 
+    private java.util.LinkedHashMap<ChunkCoordIntPair, PendingChunkToSave> pendingSaves = new java.util.LinkedHashMap<ChunkCoordIntPair, PendingChunkToSave>(); // Spigot
     private static final Logger a = LogManager.getLogger();
     private List b = new ArrayList();
     private Set c = new HashSet();
@@ -30,13 +31,11 @@ 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);
@@ -63,14 +62,12 @@ 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 +147,11 @@ 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);
+            // Spigot end
             FileIOThread.a.a(this);
         }
     }
@@ -170,12 +161,14 @@ 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) {
-- 
1.9.1