/* * Copyright (c) 2001 Sun Microsystems, Inc. All rights * reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. The end-user documentation included with the redistribution, * if any, must include the following acknowledgment: * "This product includes software developed by the * Sun Microsystems, Inc. for Project JXTA." * Alternately, this acknowledgment may appear in the software itself, * if and wherever such third-party acknowledgments normally appear. * * 4. 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For more * information on Project JXTA, please see * . * * This license is based on the BSD license adopted by the Apache Foundation. * * $Id: JxtaAppDemo.java,v 1.1 2006-09-13 19:38:41 genaud Exp $ */ import java.util.Enumeration; import net.jxta.discovery.DiscoveryEvent; import net.jxta.discovery.DiscoveryListener; import net.jxta.discovery.DiscoveryService; import net.jxta.document.Advertisement; import net.jxta.document.MimeMediaType; import net.jxta.exception.PeerGroupException; import net.jxta.peergroup.PeerGroup; import net.jxta.peergroup.PeerGroupFactory; import net.jxta.protocol.DiscoveryResponseMsg; import net.jxta.protocol.PeerAdvertisement; import net.jxta.protocol.PeerGroupAdvertisement; /** * This is a quick and simple example to primarly illustrate how to start project jxta * from an application, and how to create a DiscoveryListener interface * This is meant as an on going effort, if you can add to the * example to help others understand, and integrate project jxta, * feel free to do so, please refer to the "todo" section in README . */ public class JxtaAppDemo implements Runnable, DiscoveryListener { static PeerGroup platformGroup = null; static PeerGroup netPeerGroup = null; static PeerGroupAdvertisement groupAdvertisement = null; private DiscoveryService discovery; PeerAdvertisement padv; private void startJxta() { try { netPeerGroup = PeerGroupFactory.newNetPeerGroup(); // uncomment the following line if you want to start the app defined // the NetPeerGroup Advertisement (by default it's the shell) // in our case we want use jxta directly. // netPeerGroup.startApp(null); } catch ( PeerGroupException e) { // could not instantiate the group, print the stack and exit System.out.println("fatal error : group creation failure"); e.printStackTrace(); System.exit(1); } // obtain our group advertisement groupAdvertisement = netPeerGroup.getPeerGroupAdvertisement(); // Let's get the discovery service we're going to use this // one later on discovery = netPeerGroup.getDiscoveryService(); } /** * This thread basically loops forever discovering adv * every minute */ public void run() { String peer = null; try { // Add ourselves as a DiscoveryListener for DiscoveryResponse events discovery.addDiscoveryListener(this); while (true) { // wait a bit before sending a discovery message try { Thread.sleep(60 * 1000); } catch(Exception e) {} System.out.println("Sending a Discovery Message"); // look for any peer discovery.getRemoteAdvertisements( peer, DiscoveryService.PEER, null, null, 5, null); } } catch(Exception e) { e.printStackTrace(); } } /** * by implementing DiscoveryListener we must define this method * to deal to discovery responses */ public void discoveryEvent(DiscoveryEvent ev) { DiscoveryResponseMsg res = ev.getResponse(); // let's get the responding peer's advertisement padv = res.getPeerAdvertisement(); String name = "unknown"; if (padv != null) { // some peers may not respond with their peerAdv name = padv.getName(); } System.out.println (" [ Got a Discovery Response ["+ res.getResponseCount()+ " elements] from peer : "+ name +" ]"); // now out the goodies Advertisement adv=null; Enumeration en = res.getAdvertisements(); if (en != null ) { while (en.hasMoreElements()) { adv = (Advertisement) en.nextElement(); System.out.println (adv); } } } static public void main(String args[]) { JxtaAppDemo myapp = new JxtaAppDemo(); myapp.startJxta(); myapp.run(); } }