org/objectweb/proactive/p2p/service/P2PFirstContact.java

/* 
 * ################################################################
 * 
 * ProActive: The Java(TM) library for Parallel, Distributed, 
 *            Concurrent computing with Security and Mobility
 * 
 * Copyright (C) 1997-2007 INRIA/University of Nice-Sophia Antipolis
 * Contact: proactive@objectweb.org
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or any later version.
 *  
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 * USA
 *  
 *  Initial developer(s):               The ProActive Team
 *                        http://www.inria.fr/oasis/ProActive/contacts.html
 *  Contributor(s): 
 * 
 * ################################################################
 */ 
package org.objectweb.proactive.p2p.service;

import java.io.Serializable;
import java.util.Vector;

import org.apache.log4j.Logger;
import org.objectweb.proactive.Body;
import org.objectweb.proactive.ProActiveInternalObject;
import org.objectweb.proactive.RunActive;
import org.objectweb.proactive.core.node.Node;
import org.objectweb.proactive.core.node.NodeFactory;
import org.objectweb.proactive.core.util.log.Loggers;
import org.objectweb.proactive.core.util.log.ProActiveLogger;
import org.objectweb.proactive.p2p.service.util.P2PConstants;


public class P2PFirstContact implements Serializable, RunActive, P2PConstants,
    ProActiveInternalObject {
    private static final Logger logger = ProActiveLogger.getLogger(Loggers.P2P_FIRST_CONTACT);
    private Vector peers;
    private P2PAcquaintanceManager acqGroup;
    private P2PService localP2pService;

    public P2PFirstContact() {
        // The empty constructor
    }

    public P2PFirstContact(Vector peers, P2PAcquaintanceManager acquaintances,
        P2PService local) {
        this.peers = peers;
        this.acqGroup = acquaintances;
        this.localP2pService = local;
    }

    public void runActivity(Body body) {
        this.peers = StartP2PService.checkingPeersUrl(this.peers);
        // First coontact
        connectingPeer();
        while (body.isAlive()) {
            if (this.peers.size() != 0) {
                // We have some url and we know nobody
                connectingPeer();
            }
            try {
                Thread.sleep(Long.parseLong(System.getProperty(PROPERTY_TTU)));
            } catch (Exception e) {
            }
        }
    }

    private void connectingPeer() {
        for (int index = 0; index < this.peers.size(); index++) {
            String peerUrl = urlAdderP2PNodeName((String) this.peers.get(index));
            try {
                Node distNode = NodeFactory.getNode(peerUrl);
                P2PService peer = (P2PService) distNode.getActiveObjects(P2PService.class.getName())[0];

                if (!peer.equals(this.localP2pService) &&
                        !this.acqGroup.contains(peer).booleanValue()) {
                    // Send a message to the remote peer to record me
                    peer.register(this.localP2pService);
                    // Add the peer in my group of acquaintances
                    this.acqGroup.add(peer);
                }
            } catch (Exception e) {
                logger.debug("The peer at " + peerUrl +
                    " couldn't be contacted", e);
            }
        }
    }

    private static String urlAdderP2PNodeName(String url) {
        if (url.endsWith("/")) {
            url += P2P_NODE_NAME;
        } else {
            url += ("/" + P2P_NODE_NAME);
        }

        return url;
    }
}

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