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* The Sun Project JXTA(TM) Software License
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* developed by Sun Microsystems, Inc. for JXTA(TM) technology."
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* ====================================================================
*
* This software consists of voluntary contributions made by many individuals
* on behalf of Project JXTA. For more information on Project JXTA, please see
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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.document.AdvertisementFactory;
import net.jxta.id.IDFactory;
import net.jxta.peergroup.PeerGroup;
import net.jxta.peergroup.PeerGroupID;
import net.jxta.pipe.PipeService;
import net.jxta.platform.NetworkManager;
import net.jxta.protocol.DiscoveryResponseMsg;
import net.jxta.protocol.PipeAdvertisement;
import java.io.File;
import java.util.Enumeration;
/**
* Illustrates the use of Discovery Service
* Note this is for illustration purposes and is not meant as a blue-print
*/
public class DiscoveryServer implements DiscoveryListener {
private transient NetworkManager manager;
private transient DiscoveryService discovery;
/**
* Constructor for the DiscoveryServer
*/
public DiscoveryServer() {
try {
manager = new NetworkManager(NetworkManager.ConfigMode.ADHOC, "DiscoveryServer",
new File(new File(".cache"), "DiscoveryServer").toURI());
manager.startNetwork();
} catch (Exception e) {
e.printStackTrace();
System.exit(-1);
}
PeerGroup netPeerGroup = manager.getNetPeerGroup();
// get the discovery service
discovery = netPeerGroup.getDiscoveryService();
}
/**
* main
*
* @param args command line args
*/
public static void main(String args[]) {
DiscoveryServer disocveryServer = new DiscoveryServer();
disocveryServer.start();
}
/**
* create a new pipe adv, publish it for 2 minut network time,
* sleep for 3 minutes, then repeat
*/
public void start() {
long lifetime = 60 * 2 * 1000L;
long expiration = 60 * 2 * 1000L;
long waittime = 60 * 3 * 1000L;
try {
while (true) {
PipeAdvertisement pipeAdv = getPipeAdvertisement();
// publish the advertisement with a lifetime of 2 mintutes
System.out.println(
"Publishing the following advertisement with lifetime :" + lifetime + " expiration :" + expiration);
System.out.println(pipeAdv.toString());
discovery.publish(pipeAdv, lifetime, expiration);
discovery.remotePublish(pipeAdv, expiration);
try {
System.out.println("Sleeping for :" + waittime);
Thread.sleep(waittime);
} catch (Exception e) {// ignored
}
}
} 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);
}
}
}
/**
* Creates a pipe advertisement
*
* @return a Pipe Advertisement
*/
public static PipeAdvertisement getPipeAdvertisement() {
PipeAdvertisement advertisement = (PipeAdvertisement)
AdvertisementFactory.newAdvertisement(PipeAdvertisement.getAdvertisementType());
advertisement.setPipeID(IDFactory.newPipeID(PeerGroupID.defaultNetPeerGroupID));
advertisement.setType(PipeService.UnicastType);
advertisement.setName("Discovery tutorial");
return advertisement;
}
/**
* Stops the platform
*/
public void stop() {
// Stop JXTA
manager.stopNetwork();
}
}