endpointdemuxlistener.java

jxme的一些相关程序,主要是手机上程序开发以及手机和计算机通信的一些程序资料,程序编译需要Ant支持

/************************************************************************
 *
 * $Id: EndpointDemuxListener.java,v 1.2 2002/03/04 21:42:57 echtcherbina Exp $
 *
 * 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. 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.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL SUN MICROSYSTEMS OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * ====================================================================
 *
 * 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.endpoint;

import net.jxta.endpoint.EndpointListener;
import net.jxta.endpoint.Message;

import java.util.Vector;
import org.apache.log4j.Category; import org.apache.log4j.Priority;
import net.jxta.endpoint.EndpointAddress;

public class EndpointDemuxListener implements EndpointListener, Runnable {
    
    private static final Category LOG = Category.getInstance(EndpointDemuxListener.class.getName());
    
    public static final int MaxQueueSize = 100;
    private Vector messageQueue = new Vector();
    private boolean keepGoing = true;
    private EndpointListener listener = null;
    private int nbOfQueuedMessages = 0;
    private int nbOfDeQueuedMessages = 0;
    private Thread thread1 = null;
    private Thread thread2 = null;
    private String name = null;
    
    private synchronized void enQueue(Message m) {
        if (messageQueue.size() > MaxQueueSize) {
            if (LOG.isEnabledFor(Priority.WARN)) LOG.warn("Dropped one message; destination: " + m.getDestinationAddress().toString());
            return;
        }
        messageQueue.addElement(m);
        ++nbOfQueuedMessages;
        setThreadName();
        notifyAll();
    }
    
    private synchronized Message deQueue() {
        while (messageQueue.size() == 0) {
            if (!keepGoing) return null;
            try {
                wait();
            } catch (Exception e) {
            }
        }
        Object o =  messageQueue.elementAt(0);
        messageQueue.removeElementAt(0);
	++nbOfDeQueuedMessages;
        setThreadName();
        return (Message) o;
    }
    
    public EndpointListener getListener() {
        return listener;
    }
    
    public EndpointDemuxListener(EndpointListener listener) {
	this ("Unknown", listener);
    }

    public EndpointDemuxListener(String name, EndpointListener listener) {
        this.listener = listener;
	this.name = name;
        
        // Sometimes it takes two...
        thread1 = new Thread(this, "EndpointDemuxListener [" + name + "]");
        thread2 = new Thread(this, "EndpointDemuxListener [" + name + "]");
	thread1.start();
	thread2.start();
	Thread.yield();
    }

    private void setThreadName() {

	String newName = "EndpointDemuxListener [" + name + "," + messageQueue.size() + "," + nbOfQueuedMessages + "," + nbOfDeQueuedMessages + "]";
	try {
	    thread1.setName (newName);
	    thread2.setName (newName);
	} catch (Exception ez1) {
	    if (LOG.isEnabledFor(Priority.ERROR)) LOG.error( "EndpointDemuxListener cannot set thread name ", ez1 );
	}
    }
    
    public synchronized void unregistered() {
        keepGoing = false;
        notifyAll();
    }
    
    /**
     *  daemon thread that handles messages.
     **/
    public void run() {
        try {
            while (keepGoing) {
                Message message = deQueue();
                if (!keepGoing) return;
                try {
                    EndpointAddress srcAddr = message.getSourceAddress();
                    EndpointAddress dstAddr = message.getDestinationAddress();
                    listener.processIncomingMessage(message, srcAddr, dstAddr);
                } catch (Throwable ignored ) {
                    if (LOG.isEnabledFor(Priority.DEBUG)) LOG.debug( "EndpointDemuxListener caught an exception", ignored );
                }
            }
        } catch ( Throwable all ) {
            if (LOG.isEnabledFor(Priority.FATAL)) LOG.fatal( "Uncaught Throwable in thread : " + Thread.currentThread().getName(), all );
        }
    }
    
    public void processIncomingMessage(Message message,
    EndpointAddress srcAddr,
    EndpointAddress dstAddr) {
        message.setSourceAddress(srcAddr);
        message.setDestinationAddress(dstAddr);
        enQueue(message);
    }
}