messagequeue.java

Java SIP

/*
 * This file is part of the Java SIP library, an open source SIP library. Please see
 * http://collaboration.mitre.org/sip for more information
 * 
 * Copyright (c) 2001 The MITRE Corporation 
 * 
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Library General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 * 
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
 * License for more details.
 * 
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, USA.
 *
 */
/**
 * class to maintain incoming messages
 *
 * Based on QueueObject, DDJ 10/98 by Mike Criscolo
 *
 */
package org.mitre.jsip;

import java.util.Vector;

public class MessageQueue 
{
    // Vector is inherently thread-safe
    protected Vector queue;
    protected int itemcount;
    protected String queueName;

    public MessageQueue(String name)
    {
	queue = new Vector();
	queueName = name;
	itemcount = 0;
    }

    /**
     * Retrieve a message from the queue
     */
    public synchronized SipMessage getQueueMessage()
    {
	SipMessage item = (SipMessage) queue.firstElement();
	queue.removeElement( item );
	itemcount--;

	return item;
    }

    public synchronized void AddQueueItem(SipMessage message)
    {
	itemcount++;
	queue.addElement(message);
	if (SipClient.DEBUG) System.out.println("new item! count is " + itemcount);
    }

    public synchronized boolean hasMessage() {
	// maybe put a notify in here and have it called by AddQueueItem ???
	return ( itemcount > 0 ) ? true : false;
    }
}