Examples of java.net.MulticastSocket.joinGroup()

java.net.MulticastSocket.joinGroup()
Joins a multicast group. Its behavior may be affected by setInterface or setNetworkInterface.
If there is a security manager, this method first calls its checkMulticast method with the mcastaddr argument as its argument. @param mcastaddr is the multicast address to join @exception IOException if there is an error joiningor when the address is not a multicast address. @exception SecurityException if a security manager exists and its checkMulticast method doesn't allow the join. @see SecurityManager#checkMulticast(InetAddress)

                try {
                    //fake a discovery server to send back some canned messages.
                    InetAddress address = InetAddress.getByName("239.255.255.250");
                    MulticastSocket s = new MulticastSocket(Integer.parseInt(PORT));
                    s.setBroadcast(true);
                    s.joinGroup(address);
                    s.setReceiveBufferSize(64 * 1024);
                    s.setSoTimeout(5000);
                    byte[] bytes = new byte[64 * 1024];
                    DatagramPacket p = new DatagramPacket(bytes, bytes.length, address, Integer.parseInt(PORT));
                    s.receive(p);

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         }
         s.setSoTimeout(timeout);
         s.setTimeToLive(ttl);
         if(log.isTraceEnabled())
            log.trace("TTL on multicast discovery socket is " + ttl);
         s.joinGroup(iaGroup);
         if (trace)
            log.trace("MulticastSocket: " + s);
         DatagramPacket packet;
         // Send a request optionally restricted to a cluster partition
         StringBuffer data = new StringBuffer("GET_ADDRESS");

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                socket.setReuseAddress(true);
                socket.setReceiveBufferSize(64 * 1024);
                socket.setSendBufferSize(64 * 1024);
                socket.setTimeToLive(1);
                socket.bind(new InetSocketAddress(isa.getPort()));
                socket.joinGroup(isa.getAddress());
                mcast = socket;
                queue.execute(new MCastListener());
            } else {
                
                acceptor = new NioDatagramAcceptor();

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        Thread receiver = new Thread() {
            public void run() {
                try {
                    MulticastSocket s = new MulticastSocket(port);
                    s.joinGroup(InetAddress.getByName(group));


                    // Create a DatagramPacket and do a receive
                    byte buf[] = new byte[1024];
                    DatagramPacket pack = new DatagramPacket(buf, buf.length);
                    s.receive(pack);

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


        MulticastSocket msocket = new MulticastSocket(port);
        InetAddress group = InetAddress.getByName(ip);
        msocket.joinGroup(group);


        byte[] inbuf = new byte[1024];
        DatagramPacket packet = new DatagramPacket(inbuf, inbuf.length);


        // Wait for packet

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      public void run() {
        try {
          
          // Start Multicast Socket and listen for Requests
          final MulticastSocket mSock = new MulticastSocket(SERVICE_PORT);
          mSock.joinGroup(SERVICE_REQUEST_IP);


          // Infinite Loop
          while (true) {
            // Buffer (for Greeting Message)
            byte[] msg = new byte[GREET_MSG.getBytes("UTF-8").length];

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    MulticastSocket reqSock = new MulticastSocket();
    reqSock.send(request);
    
    // Wait for Response
    MulticastSocket resSock = new MulticastSocket(SERVICE_PORT);
    resSock.joinGroup(SERVICE_RESPONSE_IP);
    
    // 9 = # of bytes for an IP Address + 5 byte port
    DatagramPacket response = new DatagramPacket(new byte[9],9);
    
    // Receive

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    MulticastSocket reqSock = new MulticastSocket();
    reqSock.send(request);
    
    // Response Socket
    MulticastSocket resSock = new MulticastSocket(SERVICE_PORT);
    resSock.joinGroup(SERVICE_RESPONSE_IP);
    
    // 9 = # of bytes for an IP Address + 5 byte port
    DatagramPacket response = new DatagramPacket(new byte[9],9);
    
    // Set Socket Timeout

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         }
         s.setSoTimeout(timeout);
         s.setTimeToLive(ttl);
         if(log.isTraceEnabled())
            log.trace("TTL on multicast discovery socket is " + ttl);
         s.joinGroup(iaGroup);
         if (trace)
            log.trace("MulticastSocket: " + s);
         DatagramPacket packet;
         // Send a request optionally restricted to a cluster partition
         StringBuffer data = new StringBuffer("GET_ADDRESS");

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         }
         s.setSoTimeout(timeout);
         s.setTimeToLive(ttl);
         if(log.isTraceEnabled())
            log.trace("TTL on multicast discovery socket is " + ttl);
         s.joinGroup(iaGroup);
         if (trace)
            log.trace("MulticastSocket: " + s);
         DatagramPacket packet;
         // Send a request optionally restricted to a cluster partition
         StringBuffer data = new StringBuffer("GET_ADDRESS");

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