Paper/CraftBukkit-Patches/0104-Implement-Threaded-Bulk-Chunk-Compression.patch

From d44a0d5bd59d7bd85e365791a64fd49abc6d8dcc Mon Sep 17 00:00:00 2001
From: md_5 <git@md-5.net>
Date: Tue, 28 Jan 2014 20:32:07 +1100
Subject: [PATCH] Implement Threaded Bulk Chunk Compression


diff --git a/src/main/java/net/minecraft/server/PacketPlayOutMapChunkBulk.java b/src/main/java/net/minecraft/server/PacketPlayOutMapChunkBulk.java
index 30bf8a7..178a4ba 100644
--- a/src/main/java/net/minecraft/server/PacketPlayOutMapChunkBulk.java
+++ b/src/main/java/net/minecraft/server/PacketPlayOutMapChunkBulk.java
@@ -6,7 +6,7 @@ import java.util.zip.DataFormatException;
 import java.util.zip.Deflater;
 import java.util.zip.Inflater;
 
-public class PacketPlayOutMapChunkBulk extends Packet {
+public class PacketPlayOutMapChunkBulk extends Packet implements org.spigotmc.Compressible { // Spigot
 
     private int[] a;
     private int[] b;
@@ -174,7 +174,7 @@ public class PacketPlayOutMapChunkBulk extends Packet {
     }
 
     public void b(PacketDataSerializer packetdataserializer) throws IOException { // CraftBukkit - throws IOException
-        compress(); // CraftBukkit
+        // compress(); // CraftBukkit // Spigot - removed
         packetdataserializer.writeShort(this.a.length);
         packetdataserializer.writeInt(this.size);
         packetdataserializer.writeBoolean(this.h);
diff --git a/src/main/java/net/minecraft/server/ServerConnectionChannel.java b/src/main/java/net/minecraft/server/ServerConnectionChannel.java
index fb95be4..2875c94 100644
--- a/src/main/java/net/minecraft/server/ServerConnectionChannel.java
+++ b/src/main/java/net/minecraft/server/ServerConnectionChannel.java
@@ -1,15 +1,26 @@
 package net.minecraft.server;
 
+import com.google.common.util.concurrent.ThreadFactoryBuilder; // Spigot
 import net.minecraft.util.io.netty.channel.Channel;
 import net.minecraft.util.io.netty.channel.ChannelException;
 import net.minecraft.util.io.netty.channel.ChannelInitializer;
 import net.minecraft.util.io.netty.channel.ChannelOption;
 import net.minecraft.util.io.netty.handler.timeout.ReadTimeoutHandler;
+// Spigot Start
+import net.minecraft.util.io.netty.util.concurrent.DefaultEventExecutorGroup;
+import net.minecraft.util.io.netty.util.concurrent.EventExecutorGroup;
+import org.spigotmc.ChunkCompressor;
+import org.spigotmc.SpigotConfig;
+// Spigot End
 
 class ServerConnectionChannel extends ChannelInitializer {
 
     final ServerConnection a;
-
+    // Spigot Start
+    private static final EventExecutorGroup threadPool = new DefaultEventExecutorGroup( SpigotConfig.compressionThreads, new ThreadFactoryBuilder().setNameFormat( "Chunk Compressor #%d" ).setDaemon( true ).build() );
+    private static final ChunkCompressor chunkCompressor = new ChunkCompressor();
+    // Spigot End
+    
     ServerConnectionChannel(ServerConnection serverconnection) {
         this.a = serverconnection;
     }
@@ -27,7 +38,8 @@ class ServerConnectionChannel extends ChannelInitializer {
             ;
         }
 
-        channel.pipeline().addLast("timeout", new ReadTimeoutHandler(30)).addLast("legacy_query", new LegacyPingHandler(this.a)).addLast("splitter", new PacketSplitter()).addLast("decoder", new PacketDecoder()).addLast("prepender", new PacketPrepender()).addLast("encoder", new PacketEncoder());
+        channel.pipeline().addLast("timeout", new ReadTimeoutHandler(30)).addLast("legacy_query", new LegacyPingHandler(this.a)).addLast("splitter", new PacketSplitter()).addLast("decoder", new PacketDecoder()).addLast("prepender", new PacketPrepender()).addLast("encoder", new PacketEncoder())
+                .addLast( threadPool, "compressor", chunkCompressor ); // Spigot
         NetworkManager networkmanager = new NetworkManager(false);
 
         ServerConnection.a(this.a).add(networkmanager);
diff --git a/src/main/java/org/spigotmc/ChunkCompressor.java b/src/main/java/org/spigotmc/ChunkCompressor.java
new file mode 100644
index 0000000..50485d0
--- /dev/null
+++ b/src/main/java/org/spigotmc/ChunkCompressor.java
@@ -0,0 +1,21 @@
+package org.spigotmc;
+
+import net.minecraft.util.io.netty.channel.ChannelHandler;
+import net.minecraft.util.io.netty.channel.ChannelHandlerContext;
+import net.minecraft.util.io.netty.channel.ChannelOutboundHandlerAdapter;
+import net.minecraft.util.io.netty.channel.ChannelPromise;
+
+@ChannelHandler.Sharable
+public class ChunkCompressor extends ChannelOutboundHandlerAdapter
+{
+
+    @Override
+    public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception
+    {
+        if ( msg instanceof Compressible )
+        {
+            ( (Compressible) msg ).compress(); // TODO: Caching!
+        }
+        super.write( ctx, msg, promise );
+    }
+}
diff --git a/src/main/java/org/spigotmc/Compressible.java b/src/main/java/org/spigotmc/Compressible.java
new file mode 100644
index 0000000..f1cc789
--- /dev/null
+++ b/src/main/java/org/spigotmc/Compressible.java
@@ -0,0 +1,7 @@
+package org.spigotmc;
+
+public interface Compressible
+{
+
+    void compress();
+}
diff --git a/src/main/java/org/spigotmc/SpigotConfig.java b/src/main/java/org/spigotmc/SpigotConfig.java
index 552266b..ca41dd9 100755
--- a/src/main/java/org/spigotmc/SpigotConfig.java
+++ b/src/main/java/org/spigotmc/SpigotConfig.java
@@ -266,4 +266,11 @@ public class SpigotConfig
     {
         playerShuffle = getInt( "settings.player-shuffle", 0 );
     }
+
+    public static int compressionThreads;
+    private static void compressionThreads()
+    {
+        compressionThreads = getInt( "settings.compression-threads", 4 );
+        Bukkit.getLogger().log( Level.INFO, "Using {0} threads for async chunk compression", compressionThreads );
+    }
 }
-- 
1.8.3.2