/*

 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.

 *

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 * 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 Oracle 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

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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

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 */

/*

 * This source code is provided to illustrate the usage of a given feature

 * or technique and has been deliberately simplified. Additional steps

 * required for a production-quality application, such as security checks,

 * input validation and proper error handling, might not be present in

 * this sample code.

 */

import java.nio.channels.*;

import java.nio.charset.Charset;

import java.net.*;

import java.io.IOException;

import java.util.*;

/**

 * Sample multicast sender to send a message in a multicast datagram

 * to a given group.

 */

public class Sender {

    private static void usage() {

        System.err.println("usage: java Sender group:port[@interface] message");

        System.exit(-1);

    }

    public static void main(String[] args) throws IOException {

        if (args.length < 2)

            usage();

        MulticastAddress target = MulticastAddress.parse(args[0]);

        // create socket

        ProtocolFamily family = StandardProtocolFamily.INET;

        if (target.group() instanceof Inet6Address)

            family = StandardProtocolFamily.INET6;

        DatagramChannel dc = DatagramChannel.open(family).bind(new InetSocketAddress(0));

        if (target.interf() != null) {

            dc.setOption(StandardSocketOptions.IP_MULTICAST_IF, target.interf());

        }

        // send multicast packet

        dc.send(Charset.defaultCharset().encode(args[1]),

                new InetSocketAddress(target.group(), target.port()));

        dc.close();

    }

}