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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.tuscany.service.discovery.jxta.pdp;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.tuscany.service.discovery.jxta.JxtaException;
import net.jxta.discovery.DiscoveryEvent;
import net.jxta.discovery.DiscoveryListener;
import net.jxta.discovery.DiscoveryService;
import net.jxta.peer.PeerID;
import net.jxta.protocol.DiscoveryResponseMsg;
import net.jxta.protocol.PeerAdvertisement;
/**
* Listener that keeps track of peers in the same peer group.
*
* @version $Revision$ $Date$
*
*/
public class PeerListener implements DiscoveryListener {
/** Discovery service to use. */
private DiscoveryService discoveryService;
/** Interval for sending discivery messages. */
private long interval;
/** Liveness indicator. */
private AtomicBoolean live = new AtomicBoolean();
/** Owning runtime. */
private String runtimeId;
/** Available peers. */
private Map<String, PeerID> availablePeers = new HashMap<String, PeerID>();
/**
* Initializes the JXTA discovery service.
* @param discoveryService JXTA discovery service.
* @param interval Interval between sending discovery messages.
* @param runtimeId Runtime that owns this peer.
*/
public PeerListener(DiscoveryService discoveryService, long interval, String runtimeId) {
this.discoveryService = discoveryService;
this.interval = interval;
this.runtimeId = runtimeId;
}
/**
* Sends discovery messages for peer advertisements.
*/
public void start() {
live.set(true);
discoveryService.addDiscoveryListener(this);
while(live.get()) {
discoveryService.getRemoteAdvertisements(null, DiscoveryService.PEER, null, null, 5);
try {
Thread.sleep(interval);
} catch(InterruptedException ex) {
throw new JxtaException(ex);
}
}
}
/**
* returns the peer id for the runtime id.
* @param runtimeId Runtime id for which peer id is requested.
* @return Peer id.
*/
public synchronized PeerID getPeerId(String runtimeId) {
return availablePeers.get(runtimeId);
}
/**
* Listens for discovery event.
*/
public synchronized void discoveryEvent(DiscoveryEvent event) {
DiscoveryResponseMsg res = event.getResponse();
Enumeration en = res.getAdvertisements();
if (en != null ) {
while (en.hasMoreElements()) {
PeerAdvertisement adv = (PeerAdvertisement) en.nextElement();
String peerName = adv.getName();
if(!runtimeId.equals(peerName)) {
availablePeers.put(adv.getName(), adv.getPeerID());
}
}
}
System.err.println("Peer view for " + runtimeId + ": " + availablePeers.keySet());
}
/**
* Stops the pipe listener.
*/
public void stop() {
live.set(false);
}
}
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