Пример #1
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);
  }
Пример #2
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);
   }
 }