deadpeerchecker.java

java语言开发的P2P流媒体系统

/* 
 * P2P-Radio - Peer to peer streaming system
 * Project homepage: http://p2p-radio.sourceforge.net/
 * Copyright (C) 2003-2004 Michael Kaufmann <[e-mail]>
 * 
 * ---------------------------------------------------------------------------
 * This program 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 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * ---------------------------------------------------------------------------
 */

package p2pradio.monitor;
import stream2stream.network.*;
import p2pradio.Messages;
import java.util.*;


public class DeadPeerChecker
{
	private MonitorApp monitorApp;
	private Timer timer = new Timer(true);
	private HashMap peerTaskMap = new HashMap();
	
	public static final int PEER_RESPONSE_TIME = 5000;
	
	public DeadPeerChecker(MonitorApp monitorApp)
	{
		this.monitorApp = monitorApp;
	}
	
	public synchronized void checkPeer(RemotePeer peer)
	{
		// Wird dieser Peer schon 黚erpr黤t?
		if (!peerTaskMap.containsKey(peer))
		{
			DeadPeerRemover task = new DeadPeerRemover(this, peer);
			peerTaskMap.put(peer, task);
		
			timer.schedule(task, PEER_RESPONSE_TIME);
		}
	}
	
	public synchronized void peerIsAlive(RemotePeer peer)
	{
		// Schauen, ob dieser Peer in der Warteliste steht
		Object object = peerTaskMap.get(peer);
		
		if (object != null)
		{
			// Task abbrechen und von der Liste entfernen
			DeadPeerRemover task = (DeadPeerRemover)object;
			task.cancel();
			peerTaskMap.remove(peer); 
		}
	}
	
	// Wird von DeadPeerCheckerTask aufgerufen
	public synchronized void removeDeadPeer(RemotePeer peer)
	{
		peerTaskMap.remove(peer);
		
		monitorApp.getTreeDataManager().removePeer(peer);
		monitorApp.addEvent(Messages.getString("DeadPeerChecker.PEER_DOES_NOT_REACT", peer)); //$NON-NLS-1$
	}
}