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Queue tasks from secondary threads. Fixes BUKKIT-2546 and BUKKIT-2600

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This change affects the old chat compatibility layer from an
implementation only standpoint. It does not queue the 'event' to fire,
but rather queues a runnable that allows the calling thread to wait for
execution to finish.

The other effect of this change is that rcon connects now have their
commands queued to be run on next server tick using the same
implementation.

The internal implementation is in org.bukkit.craftbukkit.util.Waitable.
It is very similar to a Future<T> task, but only contains minimal
implementation with object.wait() and object.notify() calls
under the hood of waitable.get() and waitable.run().

PlayerPreLoginEvent now properly implements thread-safe event execution
by queuing the events similar to chat and rcon. This is still a poor way
albeit proper way to implement thread-safety; PlayerPreLoginEvent will
stay deprecated.
This commit is contained in:
Wesley Wolfe 2012-10-07 15:08:21 -05:00
parent 93a79cd0e6
commit 05e889f346
4 changed files with 136 additions and 42 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

61
src/main/java/net/minecraft/server/MinecraftServer.java
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@ -13,13 +13,14 @@ import java.util.logging.Level;
import java.util.logging.Logger;
// CraftBukkit start
import java.util.concurrent.ExecutionException;
import jline.console.ConsoleReader;
import joptsimple.OptionSet;
import org.bukkit.World.Environment;
import org.bukkit.craftbukkit.util.Waitable;
import org.bukkit.event.server.RemoteServerCommandEvent;
import org.bukkit.event.world.WorldSaveEvent;
import org.bukkit.event.player.PlayerChatEvent;
// CraftBukkit end
public abstract class MinecraftServer implements Runnable, IMojangStatistics, ICommandListener {
@ -79,7 +80,7 @@ public abstract class MinecraftServer implements Runnable, IMojangStatistics, IC
public ConsoleReader reader;
public static int currentTick;
public final Thread primaryThread;
public java.util.Queue<PlayerChatEvent> chatQueue = new java.util.concurrent.ConcurrentLinkedQueue<PlayerChatEvent>();
public java.util.Queue<Runnable> processQueue = new java.util.concurrent.ConcurrentLinkedQueue<Runnable>();
public int autosavePeriod;
// CraftBukkit end
@ -508,26 +509,9 @@ public abstract class MinecraftServer implements Runnable, IMojangStatistics, IC
// CraftBukkit start - only send timeupdates to the people in that world
this.server.getScheduler().mainThreadHeartbeat(this.ticks);
// Fix for old plugins still using deprecated event
while (!chatQueue.isEmpty()) {
PlayerChatEvent event = chatQueue.remove();
org.bukkit.Bukkit.getPluginManager().callEvent(event);
if (event.isCancelled()) {
continue;
}
String message = String.format(event.getFormat(), event.getPlayer().getDisplayName(), event.getMessage());
console.sendMessage(message);
if (((org.bukkit.craftbukkit.util.LazyPlayerSet) event.getRecipients()).isLazy()) {
for (Object player : getServerConfigurationManager().players) {
((EntityPlayer) player).sendMessage(message);
}
} else {
for (org.bukkit.entity.Player player : event.getRecipients()) {
player.sendMessage(message);
}
}
// Run tasks that are waiting on processing
while (!processQueue.isEmpty()) {
processQueue.remove().run();
}
// Send timeupdates to everyone, it will get the right time from the world the player is in.
@ -782,16 +766,31 @@ public abstract class MinecraftServer implements Runnable, IMojangStatistics, IC
// CraftBukkit end
}
public String i(String s) {
RemoteControlCommandListener.instance.b();
// CraftBukkit start
RemoteServerCommandEvent event = new RemoteServerCommandEvent(this.remoteConsole, s);
this.server.getPluginManager().callEvent(event);
ServerCommand servercommand = new ServerCommand(event.getCommand(), RemoteControlCommandListener.instance);
// this.q.a(RemoteControlCommandListener.instance, s);
this.server.dispatchServerCommand(this.remoteConsole, servercommand); // CraftBukkit
// CraftBukkit start
public String i(final String s) { // CraftBukkit - final parameter
Waitable<String> waitable = new Waitable<String>() {
@Override
protected String evaluate() {
RemoteControlCommandListener.instance.b();
// Event changes start
RemoteServerCommandEvent event = new RemoteServerCommandEvent(MinecraftServer.this.remoteConsole, s);
MinecraftServer.this.server.getPluginManager().callEvent(event);
// Event changes end
ServerCommand servercommand = new ServerCommand(event.getCommand(), RemoteControlCommandListener.instance);
// this.q.a(RemoteControlCommandListener.instance, s);
MinecraftServer.this.server.dispatchServerCommand(MinecraftServer.this.remoteConsole, servercommand); // CraftBukkit
return RemoteControlCommandListener.instance.c();
}};
processQueue.add(waitable);
try {
return waitable.get();
} catch (ExecutionException e) {
throw new RuntimeException("Exception processing rcon command " + s, e.getCause());
} catch (InterruptedException e) {
Thread.currentThread().interrupt(); // Maintain interrupted state
throw new RuntimeException("Interrupted processing rcon command " + s, e);
}
// CraftBukkit end
return RemoteControlCommandListener.instance.c();
}
public boolean isDebugging() {

41
src/main/java/net/minecraft/server/NetServerHandler.java
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@ -13,11 +13,13 @@ import java.io.UnsupportedEncodingException;
import java.util.logging.Level;
import java.util.HashSet;
import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.craftbukkit.CraftWorld;
import org.bukkit.craftbukkit.inventory.CraftInventoryView;
import org.bukkit.craftbukkit.inventory.CraftItemStack;
import org.bukkit.craftbukkit.util.LazyPlayerSet;
import org.bukkit.craftbukkit.util.Waitable;
import org.bukkit.craftbukkit.entity.CraftPlayer;
import org.bukkit.craftbukkit.event.CraftEventFactory;
import org.bukkit.entity.Player;
@ -832,9 +834,42 @@ public class NetServerHandler extends NetHandler {
if (PlayerChatEvent.getHandlerList().getRegisteredListeners().length != 0) {
// Evil plugins still listening to deprecated event
PlayerChatEvent queueEvent = new PlayerChatEvent(player, event.getMessage(), event.getFormat(), event.getRecipients());
final PlayerChatEvent queueEvent = new PlayerChatEvent(player, event.getMessage(), event.getFormat(), event.getRecipients());
queueEvent.setCancelled(event.isCancelled());
minecraftServer.chatQueue.add(queueEvent);
Waitable waitable = new Waitable() {
@Override
protected Object evaluate() {
Bukkit.getPluginManager().callEvent(queueEvent);
if (queueEvent.isCancelled()) {
return null;
}
String message = String.format(queueEvent.getFormat(), queueEvent.getPlayer().getDisplayName(), queueEvent.getMessage());
NetServerHandler.this.minecraftServer.console.sendMessage(message);
if (((LazyPlayerSet) queueEvent.getRecipients()).isLazy()) {
for (Object player : NetServerHandler.this.minecraftServer.getServerConfigurationManager().players) {
((EntityPlayer) player).sendMessage(message);
}
} else {
for (Player player : queueEvent.getRecipients()) {
player.sendMessage(message);
}
}
return null;
}};
if (async) {
minecraftServer.processQueue.add(waitable);
} else {
waitable.run();
}
try {
waitable.get();
} catch (InterruptedException e) {
Thread.currentThread().interrupt(); // This is proper habit for java. If we aren't handling it, pass it on!
} catch (java.util.concurrent.ExecutionException e) {
throw new RuntimeException("Exception processing chat event", e.getCause());
}
} else {
if (event.isCancelled()) {
return;
@ -1047,7 +1082,7 @@ public class NetServerHandler extends NetHandler {
PlayerPortalEvent event = new PlayerPortalEvent(this.player.getBukkitEntity(), this.player.getBukkitEntity().getLocation(), toLocation, pta, PlayerPortalEvent.TeleportCause.END_PORTAL);
event.useTravelAgent(false);
org.bukkit.Bukkit.getServer().getPluginManager().callEvent(event);
Bukkit.getServer().getPluginManager().callEvent(event);
this.player = this.minecraftServer.getServerConfigurationManager().moveToWorld(this.player, 0, true, event.getTo());
// CraftBukkit end
} else if (this.player.q().getWorldData().isHardcore()) {

30
src/main/java/net/minecraft/server/ThreadLoginVerifier.java
View File

@ -8,6 +8,7 @@ import java.net.URLEncoder;
// CraftBukkit start
import org.bukkit.craftbukkit.CraftServer;
import org.bukkit.craftbukkit.util.Waitable;
import org.bukkit.event.player.AsyncPlayerPreLoginEvent;
import org.bukkit.event.player.PlayerPreLoginEvent;
// CraftBukkit end
@ -46,15 +47,28 @@ class ThreadLoginVerifier extends Thread {
AsyncPlayerPreLoginEvent asyncEvent = new AsyncPlayerPreLoginEvent(NetLoginHandler.d(this.netLoginHandler), this.netLoginHandler.getSocket().getInetAddress());
this.server.getPluginManager().callEvent(asyncEvent);
PlayerPreLoginEvent event = new PlayerPreLoginEvent(NetLoginHandler.d(this.netLoginHandler), this.netLoginHandler.getSocket().getInetAddress());
if (asyncEvent.getResult() != PlayerPreLoginEvent.Result.ALLOWED) {
event.disallow(asyncEvent.getResult(), asyncEvent.getKickMessage());
}
this.server.getPluginManager().callEvent(event);
if (PlayerPreLoginEvent.getHandlerList().getRegisteredListeners().length != 0) {
final PlayerPreLoginEvent event = new PlayerPreLoginEvent(NetLoginHandler.d(this.netLoginHandler), this.netLoginHandler.getSocket().getInetAddress());
if (asyncEvent.getResult() != PlayerPreLoginEvent.Result.ALLOWED) {
event.disallow(asyncEvent.getResult(), asyncEvent.getKickMessage());
}
Waitable<PlayerPreLoginEvent.Result> waitable = new Waitable<PlayerPreLoginEvent.Result>() {
@Override
protected PlayerPreLoginEvent.Result evaluate() {
ThreadLoginVerifier.this.server.getPluginManager().callEvent(event);
return event.getResult();
}};
if (event.getResult() != PlayerPreLoginEvent.Result.ALLOWED) {
this.netLoginHandler.disconnect(event.getKickMessage());
return;
NetLoginHandler.b(this.netLoginHandler).processQueue.add(waitable);
if (waitable.get() != PlayerPreLoginEvent.Result.ALLOWED) {
this.netLoginHandler.disconnect(event.getKickMessage());
return;
}
} else {
if (asyncEvent.getLoginResult() != AsyncPlayerPreLoginEvent.Result.ALLOWED) {
this.netLoginHandler.disconnect(asyncEvent.getKickMessage());
return;
}
}
// CraftBukkit end

46
src/main/java/org/bukkit/craftbukkit/util/Waitable.java Normal file
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@ -0,0 +1,46 @@
package org.bukkit.craftbukkit.util;
import java.util.concurrent.ExecutionException;
public abstract class Waitable<T> implements Runnable {
private enum Status {
WAITING,
RUNNING,
FINISHED,
}
Throwable t = null;
T value = null;
Status status = Status.WAITING;
public final void run() {
synchronized (this) {
if (status != Status.WAITING) {
throw new IllegalStateException("Invalid state " + status);
}
status = Status.RUNNING;
}
try {
value = evaluate();
} catch (Throwable t) {
this.t = t;
} finally {
synchronized (this) {
status = Status.FINISHED;
this.notifyAll();
}
}
}
protected abstract T evaluate();
public synchronized T get() throws InterruptedException, ExecutionException {
while (status != Status.FINISHED) {
this.wait();
}
if (t != null) {
throw new ExecutionException(t);
}
return value;
}
}