sender.java

Networki demo is MIDlet written by WTK

/*
 *
 * Copyright (c) 2007, 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:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * 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.
 *  * Neither the name of Sun Microsystems nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS 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 THE COPYRIGHT OWNER OR
 * 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.
 */
package datagram;

import javax.microedition.io.Datagram;
import javax.microedition.io.DatagramConnection;

public class Sender extends Thread {
    private DatagramConnection dc;

    private String address;

    private String message;

    public Sender(DatagramConnection dc) {
	this.dc = dc;
	start();
    }

    public synchronized void send(String addr, String msg) {
	address = addr;
	message = msg;
	notify();
    }

    public synchronized void run() {
	while (true) {
	    // If no client to deal, wait until one connects
	    if (message == null) {
		try {
		    wait();
		} catch (InterruptedException e) {
		}
	    }

	    try {
		byte[] bytes = message.getBytes();
		Datagram dg = null;

		// Are we a sender thread for the client ? If so then there's
		// no address parameter
		if (address == null) {
		    dg = dc.newDatagram(bytes, bytes.length);
		} else {
		    dg = dc.newDatagram(bytes, bytes.length, address);
		}

		dc.send(dg);
	    } catch (Exception ioe) {
		ioe.printStackTrace();
	    }

	    // Completed client handling, return handler to pool and
	    // mark for wait
	    message = null;
	}
    }
}