Example #1
0
  void handleMessage(Message msg) {
    Event evt;
    UdpHeader hdr;

    // discard my own multicast loopback copy
    if (loopback) {
      Address dst = msg.getDest();
      Address src = msg.getSrc();

      if (dst != null && dst.isMulticastAddress() && src != null && local_addr.equals(src)) {
        if (Trace.debug) {
          Trace.info("UDP.handleMessage()", "discarded own loopback multicast packet");
        }
        return;
      }
    }

    evt = new Event(Event.MSG, msg);
    if (Trace.debug) {
      Trace.info("UDP.handleMessage()", "message is " + msg + ", headers are " + msg.getHeaders());

      /* Because Protocol.up() is never called by this bottommost layer, we call up() directly in the observer.
       * This allows e.g. PerfObserver to get the time of reception of a message */
    }
    if (observer != null) {
      observer.up(evt, up_queue.size());
    }
    hdr = (UdpHeader) msg.removeHeader(name);
    if (hdr != null) {

      /* Discard all messages destined for a channel with a different name */
      String ch_name = null;

      if (hdr.group_addr != null) {
        ch_name = hdr.group_addr;

        // Discard if message's group name is not the same as our group name unless the
        // message is a diagnosis message (special group name DIAG_GROUP)
      }
      if (ch_name != null
          && group_addr != null
          && !group_addr.equals(ch_name)
          && !ch_name.equals(Util.DIAG_GROUP)) {
        if (Trace.trace) {
          Trace.warn(
              "UDP.handleMessage()",
              "discarded message from different group ("
                  + ch_name
                  + "). Sender was "
                  + msg.getSrc());
        }
        return;
      }
    } else {
      Trace.error("UDP.handleMessage()", "message does not have a UDP header");
    }
    passUp(evt);
  }
Example #2
0
  /** Send a message to the address specified in dest */
  void sendUdpMessage(Message msg) throws Exception {
    IpAddress dest;
    Message copy;
    Event evt;

    dest = (IpAddress) msg.getDest(); // guaranteed not to be null
    setSourceAddress(msg);

    if (Trace.debug) {
      Trace.debug(
          "UDP.sendUdpMessage()",
          "sending message to "
              + msg.getDest()
              + " (src="
              + msg.getSrc()
              + "), headers are "
              + msg.getHeaders());

      // Don't send if destination is local address. Instead, switch dst and src and put in
      // up_queue.
      // If multicast message, loopback a copy directly to us (but still multicast). Once we receive
      // this,
      // we will discard our own multicast message
    }
    if (loopback && (dest.equals(local_addr) || dest.isMulticastAddress())) {
      copy = msg.copy();
      copy.removeHeader(name);
      copy.setSrc(local_addr);
      copy.setDest(dest);
      evt = new Event(Event.MSG, copy);

      /* Because Protocol.up() is never called by this bottommost layer, we call up() directly in the observer.
      This allows e.g. PerfObserver to get the time of reception of a message */
      if (observer != null) {
        observer.up(evt, up_queue.size());
      }
      if (Trace.debug) {
        Trace.info("UDP.sendUdpMessage()", "looped back local message " + copy);
      }
      passUp(evt);
      if (!dest.isMulticastAddress()) {
        return;
      }
    }

    if (use_outgoing_packet_handler) {
      outgoing_queue.add(msg);
      return;
    }

    send(msg);
  }
Example #3
0
 /**
  * If the sender is null, set our own address. We cannot just go ahead and set the address anyway,
  * as we might be sending a message on behalf of someone else ! E.g. in case of retransmission,
  * when the original sender has crashed, or in a FLUSH protocol when we have to return all
  * unstable messages with the FLUSH_OK response.
  */
 void setSourceAddress(Message msg) {
   if (msg.getSrc() == null) {
     msg.setSrc(local_addr);
   }
 }