Examples of java.net.DatagramPacket

java.net.DatagramPacket
This class represents a datagram packet.
Datagram packets are used to implement a connectionless packet delivery service. Each message is routed from one machine to another based solely on information contained within that packet. Multiple packets sent from one machine to another might be routed differently, and might arrive in any order. Packet delivery is not guaranteed. @author Pavani Diwanji @author Benjamin Renaud @version 1.46, 04/07/06 @since JDK1.0

      _socket.send(packet);
    }
    
    public DnsMessage waitAnswer(int timeout) throws IOException
    {
      DatagramPacket packet = new DatagramPacket(new byte[MAX_PACKET_SIZE], MAX_PACKET_SIZE);
      _socket.setSoTimeout(timeout);
      _socket.receive(packet);
      DnsMessage message = new DnsMessage();
      message.decode(new ByteArrayBuffer(packet.getData()));
      _socket.close();
      return message;
    }

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  protected void doStart() throws Exception 
  {    
    _packets = new DatagramPacket[getAcceptors()];
    for (int i = 0; i < getAcceptors(); i++)
    {
      _packets[i] = new DatagramPacket(new byte[MAX_UDP_SIZE], MAX_UDP_SIZE);
    }
    super.doStart();
  }

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    _datagramSocket.close();
  }
  
  public void accept(int acceptorID) throws IOException, InterruptedException 
  {
    DatagramPacket p = _packets[acceptorID];
    
    _datagramSocket.receive(p);


    int length = p.getLength();
    if (length == 2 || length == 4) return;
    
    byte[] b = new byte[length];
    System.arraycopy(p.getData(), 0, b, 0, length);
    
    Buffer buffer = new ByteArrayBuffer(b);
    
    EventHandler handler = new EventHandler();
    SipParser parser = new SipParser(buffer, handler);
    
    try
    {
      parser.parse();
      
      SipMessage message = handler.getMessage();
      message.setConnection(new UdpConnection(p.getAddress(), p.getPort()));
      
      /*
      message.set5uple(getTransportOrdinal(), getAddr(), getPort(), p.getAddress(), p.getPort());
    
      if (message.isRequest())
        ((SipRequest) message).setEndpoint(this);
        
      */
      
      process(message);
    }
    catch (Throwable t)
    {
      if (_statsStartedAt != -1) 
      {
        synchronized (_statsLock)
        {
          _nbParseErrors++;
        }
      }
      Log.warn(t);
      //if (handler.hasException())
        //Log.warn(handler.getException());
        
      if (Log.isDebugEnabled())
        Log.debug("Buffer content: \r\n" + HexString.toDetailedHexString(buffer.array(), p.getLength()));
    }
    
  }

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      return _remotePort;
    }
    
    public void write(Buffer buffer) throws IOException
    {
      DatagramPacket packet = new DatagramPacket(
          buffer.array(),
          buffer.length(),
          _remoteAddr,
          _remotePort);
      _datagramSocket.send(packet);

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    }


    private static void waitForSignals(final JMeterEngine engine, DatagramSocket socket) {
        byte[] buf = new byte[80];
        System.out.println("Waiting for possible shutdown message on port "+socket.getLocalPort());
        DatagramPacket request = new DatagramPacket(buf, buf.length);
        try {
            while(true) {
                socket.receive(request);
                InetAddress address = request.getAddress();
                // Only accept commands from the local host
                if (address.isLoopbackAddress()){
                    String command = new String(request.getData(), request.getOffset(), request.getLength(),"ASCII");
                    System.out.println("Command: "+command+" received from "+address);
                    log.info("Command: "+command+" received from "+address);
                    if (command.equals("StopTestNow")){
                        engine.stopTest(true);
                    } else if (command.equals("Shutdown")) {

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        init();
    }


    public void init() throws IOException {
        setupSocket();
        sendPacket = new DatagramPacket(new byte[MAX_PACKET_SIZE],MAX_PACKET_SIZE);
        sendPacket.setAddress(address);
        sendPacket.setPort(port);
        receivePacket = new DatagramPacket(new byte[MAX_PACKET_SIZE],MAX_PACKET_SIZE);
        receivePacket.setAddress(address);
        receivePacket.setPort(port);
        member.setCommand(new byte[0]);
        member.getData(true, true);
        if ( membership == null ) membership = new Membership(member);

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        //if ( (startLevel&Channel.MBR_TX_SEQ) != Channel.MBR_TX_SEQ ) return;
        member.inc();
        if(log.isTraceEnabled())
            log.trace("Mcast send ping from member " + member);
        byte[] data = member.getData();
        DatagramPacket p = new DatagramPacket(data,data.length);
        p.setAddress(address);
        p.setPort(port);
        socket.send(p);
        if ( checkexpired ) checkExpired();
    }

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      // The receiving end had better be expecting whatever encoding
      // is used here on the sending end!
      rawData = string.getBytes(encoding);
    }


    DatagramPacket packet =
      new DatagramPacket(
                 rawData,
                 rawData.length,
                 address,
                 port);

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        }


        // write some messages
        for (int i = 0; i < CLIENT_COUNT; i++) {
            byte[] data = ("test:" + i).getBytes();
            clients[i].send(new DatagramPacket(data, data.length, serverAddy));
        }


        // does the session open message was fired ?
        assertTrue(openLatch.await(WAIT_TIME, TimeUnit.MILLISECONDS));


        // test is message was received by the server
        assertTrue(msgReadLatch.await(WAIT_TIME, TimeUnit.MILLISECONDS));


        // does response was wrote and sent ?
        assertTrue(msgSentLatch.await(WAIT_TIME, TimeUnit.MILLISECONDS));


        // read the echos
        final byte[] buffer = new byte[1024];


        for (int i = 0; i < CLIENT_COUNT; i++) {
            DatagramPacket dp = new DatagramPacket(buffer, buffer.length);
            clients[i].receive(dp);
            final String text = new String(buffer, 0, dp.getLength());
            assertEquals("test:" + i, text);
        }


        msgReadLatch = new CountDownLatch(CLIENT_COUNT);


        // try again
        // write some messages again
        for (int i = 0; i < CLIENT_COUNT; i++) {
            byte[] data = ("test:" + i).getBytes();
            clients[i].send(new DatagramPacket(data, data.length, serverAddy));
        }


        // test is message was received by the server
        assertTrue(msgReadLatch.await(WAIT_TIME, TimeUnit.MILLISECONDS));

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        }


        // write some messages
        for (int i = 0; i < CLIENT_COUNT; i++) {
            byte[] data = ("test:" + i).getBytes();
            clients[i].send(new DatagramPacket(data, data.length, serverAddy));
        }


        // does the session open message was fired ?
        assertTrue(openLatch.await(WAIT_TIME, TimeUnit.MILLISECONDS));


        // test is message was received by the server
        assertTrue(msgReadLatch.await(WAIT_TIME, TimeUnit.MILLISECONDS));


        // does response was wrote and sent ?
        assertTrue(msgSentLatch.await(WAIT_TIME, TimeUnit.MILLISECONDS));


        // read the echos
        final byte[] buffer = new byte[1024];


        for (int i = 0; i < CLIENT_COUNT; i++) {
            DatagramPacket dp = new DatagramPacket(buffer, buffer.length);
            clients[i].receive(dp);
            final String text = new String(buffer, 0, dp.getLength());
            assertEquals("test:" + i, text);
        }


        msgReadLatch = new CountDownLatch(CLIENT_COUNT);


        // try again
        // write some messages again
        for (int i = 0; i < CLIENT_COUNT; i++) {
            byte[] data = ("test:" + i).getBytes();
            clients[i].send(new DatagramPacket(data, data.length, serverAddy));
        }


        // test is message was received by the server
        assertTrue(msgReadLatch.await(WAIT_TIME, TimeUnit.MILLISECONDS));

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