Examples of java.net.MulticastSocket.send()

java.net.MulticastSocket.send()
Sends a datagram packet to the destination, with a TTL (time- to-live) other than the default for the socket. This method need only be used in instances where a particular TTL is desired; otherwise it is preferable to set a TTL once on the socket, and use that default TTL for all packets. This method does not alter the default TTL for the socket. Its behavior may be affected by setInterface.
If there is a security manager, this method first performs some security checks. First, if p.getAddress().isMulticastAddress() is true, this method calls the security manager's checkMulticast method with p.getAddress() and ttl as its arguments. If the evaluation of that expression is false, this method instead calls the security manager's checkConnect method with arguments p.getAddress().getHostAddress() and p.getPort(). Each call to a security manager method could result in a SecurityException if the operation is not allowed. @param p is the packet to be sent. The packet should containthe destination multicast ip address and the data to be sent. One does not need to be the member of the group to send packets to a destination multicast address. @param ttl optional time to live for multicast packet.default ttl is 1. @exception IOException is raised if an error occurs i.eerror while setting ttl. @exception SecurityException if a security manager exists and its checkMulticast or checkConnect method doesn't allow the send. @deprecated Use the following code or its equivalent instead:...... int ttl = mcastSocket.getTimeToLive(); mcastSocket.setTimeToLive(newttl); mcastSocket.send(p); mcastSocket.setTimeToLive(ttl); ...... @see DatagramSocket#send @see DatagramSocket#receive @see SecurityManager#checkMulticast(java.net.InetAddress,byte) @see SecurityManager#checkConnect

                    send_msg=new Message(null, null, buf);
                    channel.send(send_msg);
                }
                else {
                    packet=new DatagramPacket(buf, buf.length, group_addr, 7777);
                    sock.send(packet);
                }
                if(i % 1000 == 0)
                    System.out.println("-- sent " + i);


                matrix[i][0]=1;

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        MulticastSocket s = new MulticastSocket(
            Properties.MultiCastPort);
        s.joinGroup(group);
        DatagramPacket hi = new DatagramPacket(Key.getBytes(), Key
            .length(), group, Properties.MultiCastPort);
        s.send(hi);
        s.leaveGroup(group);
        s.close();
        logWriter.Info("sync cache information successfully (" + Key + ") ");
      } catch (Exception ex) {
        logWriter.Error("sync cache information failure (" + Key + ") " + ex.toString());

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                        buf[i] = (byte) i;
                    }
                    DatagramPacket pack = new DatagramPacket(buf, buf.length,
                                                             InetAddress.getByName(group), port);
                    s.setTimeToLive(2);
                    s.send(pack);
                    System.out.println("Sent test data");
                    s.close();
                } catch (Exception e) {
                    e.printStackTrace();
                    canRunTests = false;

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    MulticastSocket Msocket = null;
    try {                
      Msocket = new MulticastSocket();
      InetAddress group = InetAddress.getByName(t.ip); 
      DatagramPacket packet = new DatagramPacket(message, message.length, group, t.port);        
      Msocket.send(packet);
    } catch (IOException e) {        
      e.printStackTrace();
    }finally{
      Msocket.close();
    }

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                    written = ((DatagramChannel) this.getChannel()).send(buf, addr);
                }
                else {
                    sendDP = new DatagramPacket(buf2, buf2.length, address, port);
                    MulticastSocket ms = this.multicastStateManager.getMulticastSocket();
                    ms.send(sendDP);
                    written = sendDP.getLength();
                }
            } else {
                RubyString data = args[0].convertToString();
                ByteBuffer buf = ByteBuffer.wrap(data.getBytes());

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            // send the datagram
            byte[] sendData = message.getBytes();
            DatagramPacket sendDatagram = new DatagramPacket(sendData, 0,
                    sendData.length, new InetSocketAddress(InetAddress
                            .getByName(ADDRESS), PORT));
            socket.send(sendDatagram);


            // receive the datagram
            byte[] recvData = new byte[100];
            DatagramPacket recvDatagram = new DatagramPacket(recvData,
                    recvData.length);

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        InetAddress group = InetAddress.getByName(Constants.GROUP_IP);
        DatagramPacket packet;
        packet = new DatagramPacket(buf, buf.length, group, Constants.PORT_UDP);
        MulticastSocket socket = new MulticastSocket(Constants.PORT_UDP);
        socket.send(packet);
  }
  
}

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                                   // socket.receive()
        // send & recieve packet
        byte[] sendData = message.getBytes();
        DatagramPacket sendDatagram = new DatagramPacket(sendData, 0,
                sendData.length, group, PORT);
        socket.send(sendDatagram);
        socket.receive(recvDatagram);
        String recvMessage = new String(recvData, 0, recvDatagram.getLength());
        assertEquals(message, recvMessage);
        
        // send & receive longer packet

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        // send & receive longer packet
        sendData = longerMessage.getBytes();
        sendDatagram = new DatagramPacket(sendData, 0, sendData.length,
                group, PORT);
        socket.send(sendDatagram);
        socket.receive(recvDatagram);
        recvMessage = new String(recvData, 0, recvDatagram.getLength());
        assertEquals(longerMessage, recvMessage);


        // tricky case, added to test compatibility with RI;

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        // tricky case, added to test compatibility with RI;
        // depends on the previous test case
        sendData = veryLongMessage.getBytes();
        sendDatagram = new DatagramPacket(sendData, 0, sendData.length, group,
                PORT);
        socket.send(sendDatagram);
        recvDatagram.setLength(recvDatagram.getLength()); // !!!
        socket.receive(recvDatagram);
        recvMessage = new String(recvData, 0, recvDatagram.getLength());
        assertEquals(longerMessage, recvMessage);

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