/**
   * 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");
      }
    }
  }
Example #2
0
 // To be called exactly twice by the child process
 public static void rendezvousChild() {
   try {
     for (int i = 0; i < 100; i++) {
       System.gc();
       System.runFinalization();
       Thread.sleep(50);
     }
     System.out.write((byte) '\n');
     System.out.flush();
     System.in.read();
   } catch (Throwable t) {
     throw new Error(t);
   }
 }