rendezvoustracker.java

基于jxta的P2P框架的系统

/**
 * -- Copyright (C) 2006 Hisham Khalil. All rights reserved.
 *
 * 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,
 *
 * Author: Hisham Khalil <[e-mail]>
 */

package connex.core.WS;



import java.util.Enumeration;
import net.jxta.peergroup.PeerGroup;
import net.jxta.rendezvous.*;

import org.apache.log4j.Logger;
import java.util.Vector;


public class RendezvousTracker implements RendezvousListener {

    private RendezVousService rendezvousService;
    private PeerGroup peerGroup;
    private String rdvID;


    /**
     * @associates connex.core.WS.RdvListener
     * @directed
     */
    private Vector rdvListeners;

    public RendezvousTracker(PeerGroup peerGroup) {

        rdvListeners = new Vector();
        this.peerGroup = peerGroup;
        Logger.getLogger("connex.core.WS.Boot").info(
                "RendezvousTracker started for " +
                peerGroup.getPeerName() + ";");
        rendezvousService = peerGroup.getRendezVousService();
        rendezvousService.addListener(this);
    }

    public String getCurrentConnectedRendezvous() {
        Enumeration rendezvous = rendezvousService.getConnectedRendezVous();
        if (rendezvous.hasMoreElements()) {
            return rendezvous.nextElement().toString();
        } else {
            return null;
        }
    }

    public void rendezvousEvent(RendezvousEvent e) {

        String event;

        switch (e.getType()) {
        case 0:
            event = "rendezvous connect";
            rdvID = e.getPeerID().toString();
            break;

        case 1:
            event = "rendezvous reconnect";

            break;

        case 2:
            event = "client connect";
            break;

        case 6:
            event = "client disconnect";
            break;

        case 7:
            event = "client failed";
            break;

        case 3:
            event = "client reconnect";
            break;

        case 4:
            event = "rendezvous disconnect";
            break;

        case 5:
            event = "rendezvous failed";
            break;
        case 8:
            event = "became rendezvous";
            break;
        case 9:
            event = "became edge";
            break;

        default:
            event = "Unknown: " + e.getType();

            break;
        }
        this.dispatchEvent(event);
    }


    public String getConnectedRdvID() {
        return rdvID;
    }


    public void addListener(RdvListener rdvListener) {
        rdvListeners.addElement(rdvListener);
    }

    public void removeListener(RdvListener rdvListener) {
        rdvListeners.removeElement(rdvListener);
        rendezvousService.removeListener(this);
    }

    public void dispatchEvent(String e) {
        java.util.Enumeration enumeration = rdvListeners();
        while (enumeration.hasMoreElements()) {
            ((RdvListener) enumeration.nextElement()).update(e);
        }
    }

    public Enumeration rdvListeners() {
        return ((java.util.Vector) rdvListeners.clone()).elements();
    }
}