trunk/java/com/l2jserver/util/DeadLockDetector.java

@@ -0,0 +1,124 @@
+/*
+ * Copyright (C) 2004-2014 L2J Server
+ * 
+ * This file is part of L2J Server.
+ * 
+ * L2J Server is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * L2J Server is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.l2jserver.util;
+
+import java.lang.management.LockInfo;
+import java.lang.management.ManagementFactory;
+import java.lang.management.MonitorInfo;
+import java.lang.management.ThreadInfo;
+import java.lang.management.ThreadMXBean;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import com.l2jserver.Config;
+import com.l2jserver.gameserver.Shutdown;
+import com.l2jserver.gameserver.util.Broadcast;
+
+/**
+ * Thread to check for deadlocked threads.
+ * @author -Nemesiss- L2M
+ */
+public class DeadLockDetector extends Thread
+{
+	private static Logger _log = Logger.getLogger(DeadLockDetector.class.getName());
+	
+	/** Interval to check for deadlocked threads */
+	private static final int _sleepTime = Config.DEADLOCK_CHECK_INTERVAL * 1000;
+	
+	private final ThreadMXBean tmx;
+	
+	public DeadLockDetector()
+	{
+		super("DeadLockDetector");
+		tmx = ManagementFactory.getThreadMXBean();
+	}
+	
+	@Override
+	public final void run()
+	{
+		boolean deadlock = false;
+		while (!deadlock)
+		{
+			try
+			{
+				long[] ids = tmx.findDeadlockedThreads();
+				
+				if (ids != null)
+				{
+					deadlock = true;
+					ThreadInfo[] tis = tmx.getThreadInfo(ids, true, true);
+					StringBuilder info = new StringBuilder();
+					info.append("DeadLock Found!");
+					info.append(Config.EOL);
+					for (ThreadInfo ti : tis)
+					{
+						info.append(ti.toString());
+					}
+					
+					for (ThreadInfo ti : tis)
+					{
+						LockInfo[] locks = ti.getLockedSynchronizers();
+						MonitorInfo[] monitors = ti.getLockedMonitors();
+						if ((locks.length == 0) && (monitors.length == 0))
+						{
+							continue;
+						}
+						
+						ThreadInfo dl = ti;
+						info.append("Java-level deadlock:");
+						info.append(Config.EOL);
+						info.append('\t');
+						info.append(dl.getThreadName());
+						info.append(" is waiting to lock ");
+						info.append(dl.getLockInfo().toString());
+						info.append(" which is held by ");
+						info.append(dl.getLockOwnerName());
+						info.append(Config.EOL);
+						while ((dl = tmx.getThreadInfo(new long[]
+						{
+							dl.getLockOwnerId()
+						}, true, true)[0]).getThreadId() != ti.getThreadId())
+						{
+							info.append('\t');
+							info.append(dl.getThreadName());
+							info.append(" is waiting to lock ");
+							info.append(dl.getLockInfo().toString());
+							info.append(" which is held by ");
+							info.append(dl.getLockOwnerName());
+							info.append(Config.EOL);
+						}
+					}
+					_log.warning(info.toString());
+					
+					if (Config.RESTART_ON_DEADLOCK)
+					{
+						Broadcast.toAllOnlinePlayers("Server has stability issues - restarting now.");
+						Shutdown.getInstance().startTelnetShutdown("DeadLockDetector - Auto Restart", 60, true);
+					}
+					
+				}
+				Thread.sleep(_sleepTime);
+			}
+			catch (Exception e)
+			{
+				_log.log(Level.WARNING, "DeadLockDetector: ", e);
+			}
+		}
+	}
+}