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Paper/Spigot-Server-Patches/0133-Avoid-blocking-on-Network-Manager-creation.patch

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From adcbfe820185e2f44f33c9f4054c34b82841a23d Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Mon, 16 May 2016 23:19:16 -0400
Subject: [PATCH] Avoid blocking on Network Manager creation
Per Paper issue 294
diff --git a/src/main/java/net/minecraft/server/ServerConnection.java b/src/main/java/net/minecraft/server/ServerConnection.java
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index 567edb30..4a629aaa 100644
--- a/src/main/java/net/minecraft/server/ServerConnection.java
+++ b/src/main/java/net/minecraft/server/ServerConnection.java
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@@ -60,6 +60,15 @@ public class ServerConnection {
public volatile boolean d;
private final List<ChannelFuture> g = Collections.synchronizedList(Lists.newArrayList());
private final List<NetworkManager> h = Collections.synchronizedList(Lists.newArrayList());
+ // Paper start - prevent blocking on adding a new network manager while the server is ticking
+ private final List<NetworkManager> pending = Collections.synchronizedList(Lists.<NetworkManager>newArrayList());
+ private void addPending() {
+ synchronized (pending) {
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+ this.h.addAll(pending); // Paper - OBFHELPER - List of network managers
+ pending.clear();
+ }
+ }
+ // Paper end
public ServerConnection(MinecraftServer minecraftserver) {
this.f = minecraftserver;
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@@ -94,7 +103,7 @@ public class ServerConnection {
channel.pipeline().addLast("timeout", new ReadTimeoutHandler(30)).addLast("legacy_query", new LegacyPingHandler(ServerConnection.this)).addLast("splitter", new PacketSplitter()).addLast("decoder", new PacketDecoder(EnumProtocolDirection.SERVERBOUND)).addLast("prepender", new PacketPrepender()).addLast("encoder", new PacketEncoder(EnumProtocolDirection.CLIENTBOUND));
NetworkManager networkmanager = new NetworkManager(EnumProtocolDirection.SERVERBOUND);
- ServerConnection.this.h.add(networkmanager);
+ pending.add(networkmanager); // Paper
channel.pipeline().addLast("packet_handler", networkmanager);
networkmanager.setPacketListener(new HandshakeListener(ServerConnection.this.f, networkmanager));
}
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@@ -123,6 +132,7 @@ public class ServerConnection {
synchronized (this.h) {
// Spigot Start
+ addPending(); // Paper
// This prevents players from 'gaming' the server, and strategically relogging to increase their position in the tick order
if ( org.spigotmc.SpigotConfig.playerShuffle > 0 && MinecraftServer.currentTick % org.spigotmc.SpigotConfig.playerShuffle == 0 )
{
--
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