/*
* Copyright (c) 2001-2007 Sun Microsystems, Inc. All rights reserved.
*
* The Sun Project JXTA(TM) Software License
*
* 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
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*
* 3. The end-user documentation included with the redistribution, if any, must
* include the following acknowledgment: "This product includes software
* developed by Sun Microsystems, Inc. for JXTA(TM) technology."
* Alternately, this acknowledgment may appear in the software itself, if
* and wherever such third-party acknowledgments normally appear.
*
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* not be used to endorse or promote products derived from this software
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* Project JXTA at http://www.jxta.org.
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* 5. Products derived from this software may not be called "JXTA", nor may
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*
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* States and other countries.
*
* Please see the license information page at :
* <http://www.jxta.org/project/www/license.html> for instructions on use of
* the license in source files.
*
* ====================================================================
*
* This software consists of voluntary contributions made by many individuals
* on behalf of Project JXTA. For more information on Project JXTA, please see
* http://www.jxta.org.
*
* This license is based on the BSD license adopted by the Apache Foundation.
*/
package tutorial.discovery;
import net.jxta.discovery.DiscoveryEvent;
import net.jxta.discovery.DiscoveryListener;
import net.jxta.discovery.DiscoveryService;
import net.jxta.document.Advertisement;
import net.jxta.peergroup.PeerGroup;
import net.jxta.platform.NetworkManager;
import net.jxta.protocol.DiscoveryResponseMsg;
import java.io.File;
import java.util.Enumeration;
/**
* Illustrates the use of the Discovery Service
*/
public class DiscoveryClient implements DiscoveryListener {
private transient NetworkManager manager;
private transient DiscoveryService discovery;
/**
* Constructor for the DiscoveryClient
*/
public DiscoveryClient() {
try {
manager = new NetworkManager(NetworkManager.ConfigMode.ADHOC, "DiscoveryClient",
new File(new File(".cache"), "DiscoveryClient").toURI());
manager.startNetwork();
} catch (Exception e) {
e.printStackTrace();
System.exit(-1);
}
// Get the NetPeerGroup
PeerGroup netPeerGroup = manager.getNetPeerGroup();
// get the discovery service
discovery = netPeerGroup.getDiscoveryService();
}
/**
* main
*
* @param args command line args
*/
public static void main(String args[]) {
DiscoveryClient disocveryClient = new DiscoveryClient();
disocveryClient.start();
}
/**
* loop forever attempting to discover advertisements every minute
*/
public void start() {
long waittime = 60 * 1000L;
try {
// Add ourselves as a DiscoveryListener for DiscoveryResponse events
discovery.addDiscoveryListener(this);
discovery.getRemoteAdvertisements(// no specific peer (propagate)
null, // Adv type
DiscoveryService.ADV, // Attribute = any
null, // Value = any
null, // one advertisement response is all we are looking for
1, // no query specific listener. we are using a global listener
null);
while (true) {
// wait a bit before sending a discovery message
try {
System.out.println("Sleeping for :" + waittime);
Thread.sleep(waittime);
} catch (Exception e) {
// ignored
}
System.out.println("Sending a Discovery Message");
// look for any peer
discovery.getRemoteAdvertisements(
// no specific peer (propagate)
null,
// Adv type
DiscoveryService.ADV,
// Attribute = name
"Name",
// Value = the tutorial
"Discovery tutorial",
// one advertisement response is all we are looking for
1,
// no query specific listener. we are using a global listener
null);
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* This method is called whenever a discovery response is received, which are
* either in response to a query we sent, or a remote publish by another node
*
* @param ev the discovery event
*/
public void discoveryEvent(DiscoveryEvent ev) {
DiscoveryResponseMsg res = ev.getResponse();
// let's get the responding peer's advertisement
System.out.println(" [ Got a Discovery Response [" + res.getResponseCount() + " elements] from peer : " + ev.getSource() + " ]");
Advertisement adv;
Enumeration en = res.getAdvertisements();
if (en != null) {
while (en.hasMoreElements()) {
adv = (Advertisement) en.nextElement();
System.out.println(adv);
}
}
}
/**
* Stops the platform
*/
public void stop() {
// Stop JXTA
manager.stopNetwork();
}
}