/**
   * Sends a leave message to the multicast group and leaves it. The <CODE>DiscoveryResponder</CODE>
   * leaves its multicast group. This method has no effect if the <CODE>DiscoveryResponder</CODE> is
   * <CODE>OFFLINE</CODE> or <CODE>STOPPING</CODE> or <CODE>STARTING</CODE>.
   */
  public void stop() {
    if (state == ONLINE) {
      changeState(STOPPING);
      // ------------------------
      // Stop corresponding thread
      // ------------------------

      responder.stopRequested = true;

      synchronized (responder.interrupted) {
        if (!responder.interrupted.booleanValue()) {
          responderThread.interrupt();
        }
      }

      // Fix for cases when the interrupt does not work (Windows NT)
      try {
        MulticastSocket ms = new MulticastSocket(multicastPort);

        // NPCTE fix for bugId 4499338, esc 0, 04 Sept 2001
        if (usrInet != null) {
          ms.setInterface(usrInet);

          if (logger.finerOn()) {
            logger.finer("stop ", "use the interface " + usrInet);
          }
        }
        // end of NPCTE fix for bugId 4499338

        InetAddress group = InetAddress.getByName(multicastGroup);
        ms.joinGroup(group);
        ms.send(new DatagramPacket(new byte[1], 1, group, multicastPort));
        ms.leaveGroup(group);
      } catch (Exception e) {
        if (logger.finerOn()) {
          logger.finer(
              "stop ",
              "Unexpected exception occurred trying to send empty message " + e.getMessage());
        }
      }

      // ------------------------
      // free 'remained' allocated resource
      // ------------------------
      responder = null;
      System.runFinalization();

      // ----------------
      // Update state
      // ----------------
      // changeState(OFFLINE) ;
    } else {
      if (logger.finerOn()) {
        logger.finer("stop ", "Responder is not ONLINE");
      }
    }
  }
示例#2
0
文件: UDP.java 项目: NZDIS/jgroups
  /**
   * Create UDP sender and receiver sockets. Currently there are 2 sockets (sending and receiving).
   * This is due to Linux's non-BSD compatibility in the JDK port (see DESIGN).
   */
  void createSockets() throws Exception {
    InetAddress tmp_addr = null;

    // bind_addr not set, try to assign one by default. This is needed on Windows

    // changed by bela Feb 12 2003: by default multicast sockets will be bound to all network
    // interfaces

    // CHANGED *BACK* by bela March 13 2003: binding to all interfaces did not result in a correct
    // local_addr. As a matter of fact, comparison between e.g. 0.0.0.0:1234 (on hostA) and
    // 0.0.0.0:1.2.3.4 (on hostB) would fail !
    if (bind_addr == null) {
      InetAddress[] interfaces =
          InetAddress.getAllByName(InetAddress.getLocalHost().getHostAddress());
      if (interfaces != null && interfaces.length > 0) bind_addr = interfaces[0];
    }

    if (bind_addr == null) bind_addr = InetAddress.getLocalHost();

    if (bind_addr != null && Trace.trace) {
      Trace.info(
          "UDP.createSockets()",
          "unicast sockets will use interface " + bind_addr.getHostAddress());

      // 2. Create socket for receiving unicast UDP packets. The address and port
      //    of this socket will be our local address (local_addr)

      // 27-6-2003 bgooren, find available port in range (start_port, start_port+port_range)
    }
    int rcv_port = bind_port, max_port = bind_port + port_range;
    while (rcv_port <= max_port) {

      try {
        sock = new DatagramSocket(rcv_port, bind_addr);
        break;
      } catch (SocketException bind_ex) { // Cannot listen on this port
        rcv_port++;
      } catch (SecurityException sec_ex) { // Not allowed to list on this port
        rcv_port++;
      }

      // Cannot listen at all, throw an Exception
      if (rcv_port == max_port + 1) { // +1 due to the increment above
        throw new Exception(
            "UDP.createSockets(): cannot list on any port in range "
                + bind_port
                + "-"
                + (bind_port + port_range));
      }
    }
    // ucast_recv_sock=new DatagramSocket(bind_port, bind_addr);
    if (sock == null) {
      throw new Exception("UDP.createSocket(): sock is null");
    }

    local_addr = new IpAddress(sock.getLocalAddress(), sock.getLocalPort());
    if (additional_data != null) {
      local_addr.setAdditionalData(additional_data);

      // 3. Create socket for receiving IP multicast packets
    }
    if (ip_mcast) {
      mcast_sock = new MulticastSocket(mcast_port);
      mcast_sock.setTimeToLive(ip_ttl);
      if (bind_addr != null) {
        mcast_sock.setInterface(bind_addr);
      }
      tmp_addr = InetAddress.getByName(mcast_addr_name);
      mcast_addr = new IpAddress(tmp_addr, mcast_port);
      mcast_sock.joinGroup(tmp_addr);
    }

    setBufferSizes();

    if (Trace.trace) {
      Trace.info("UDP.createSockets()", "socket information:\n" + dumpSocketInfo());
    }
  }