/*
* Copyright (c) 2002-2007 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
* 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 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.
*
* 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA" must
* not be used to endorse or promote products derived from this software
* without prior written permission. For written permission, please contact
* Project JXTA at http://www.jxta.org.
*
* 5. Products derived from this software may not be called "JXTA", nor may
* "JXTA" appear in their name, without prior written permission of Sun.
*
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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*
* JXTA is a registered trademark of Sun Microsystems, Inc. in the United
* 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 net.jxta.impl.rendezvous.limited;
import net.jxta.endpoint.EndpointAddress;
import net.jxta.endpoint.EndpointListener;
import net.jxta.endpoint.EndpointService;
import net.jxta.endpoint.Message;
import net.jxta.impl.protocol.LimitedRangeRdvMsg;
import net.jxta.impl.rendezvous.RdvGreeter;
import net.jxta.impl.rendezvous.rpv.PeerViewElement;
import net.jxta.logging.Logging;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* The limited range rendezvous peer greeter.
*
* @see net.jxta.impl.rendezvous.RdvGreeter
* @see net.jxta.impl.rendezvous.RdvWalk
* @see net.jxta.impl.rendezvous.RdvWalker
* @see net.jxta.impl.protocol.LimitedRangeRdvMsg
*/
public class LimitedRangeGreeter implements EndpointListener, RdvGreeter {
/**
* Logger
*/
private static final Logger LOG = Logger.getLogger(LimitedRangeGreeter.class.getName());
/**
* The walk we are associated with.
*/
private final LimitedRangeWalk walk;
/**
* XXX It would be nice to avoid making another link to the endpoint.
*/
private final EndpointService endpoint;
/**
* Constructor
*
* @param walk The walk we will be associated with.
*/
public LimitedRangeGreeter(LimitedRangeWalk walk) {
this.walk = walk;
this.endpoint = walk.getPeerGroup().getEndpointService();
if (!endpoint.addIncomingMessageListener(this, walk.getWalkServiceName(), walk.getWalkServiceParam())) {
throw new IllegalStateException("Could not register endpoint listener for greeter.");
}
if (Logging.SHOW_INFO && LOG.isLoggable(Level.INFO)) {
LOG.info("Listening on " + walk.getWalkServiceName() + "/" + walk.getWalkServiceParam());
}
}
/**
* {@inheritDoc}
*/
public synchronized void stop() {
endpoint.removeIncomingMessageListener(walk.getWalkServiceName(), walk.getWalkServiceParam());
}
/**
* {@inheritDoc}
* <p/>
* Listens on "LR-Greeter"<groupid>/<walkSvc><walkParam>
* <p/>
* Currently, all this method has to do, is to invoke the upper layer.
*/
public void processIncomingMessage(Message message, EndpointAddress srcAddr, EndpointAddress dstAddr) {
if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.fine("Processing " + message + " from " + srcAddr);
}
LimitedRangeRdvMsg rdvMsg = LimitedRangeWalk.getRdvMessage(message);
// Check and update the Limited Range Rdv Message
if (null == rdvMsg) {
// Message is invalid, drop it
if (Logging.SHOW_WARNING && LOG.isLoggable(Level.WARNING)) {
LOG.warning("Limited Range Greeter received invalid " + message + ". Dropping it.");
}
return;
}
if (rdvMsg.getTTL() <= 0) {
if (Logging.SHOW_WARNING && LOG.isLoggable(Level.WARNING)) {
LOG.warning("No TTL remaining for " + message + ". Dropping it.");
}
return;
}
if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.fine("Limited Range Greeter calling listener");
}
try {
walk.getListener().processIncomingMessage(message, srcAddr, dstAddr);
} catch (Throwable ignored) {
if (Logging.SHOW_SEVERE && LOG.isLoggable(Level.SEVERE)) {
LOG.log(Level.SEVERE, "Uncaught Throwable in listener (" + walk.getListener() + ")", ignored);
}
}
}
/**
* {@inheritDoc}
*/
public void replyMessage(Message msg, Message reply) throws IOException {
LimitedRangeRdvMsg rdvMsg = LimitedRangeWalk.getRdvMessage(msg);
if (rdvMsg == null) {
// No RdvMessage. This message was not received by this Greeter.
throw new IOException("LimitedRangeWalker was not able to send message" + ": not from this greeter");
}
PeerViewElement pve = walk.getPeerView().getPeerViewElement(rdvMsg.getSrcPeerID());
if (null == pve) {
throw new IOException("LimitedRangeWalker was not able to send message" + ": no pve");
}
if (!pve.sendMessage(msg, rdvMsg.getSrcSvcName(), rdvMsg.getSrcSvcParams())) {
throw new IOException("LimitedRangeWalker was not able to send message" + ": send failed");
}
}
}