Пример #1
0
 /**
  * Sends an event down the protocol stack. Note that - contrary to {@link #send(Message)}, if the
  * event is a message, no checks are performed whether the channel is closed or disconnected.
  *
  * @param evt the message to send down, encapsulated in an event
  */
 public Object down(Event evt) {
   if (evt == null) return null;
   if (stats && evt.getType() == Event.MSG) {
     sent_msgs++;
     sent_bytes += ((Message) evt.getArg()).getLength();
   }
   return prot_stack.down(evt);
 }
Пример #2
0
  /**
   * handle the UP event.
   *
   * @param evt - the event being send from the stack
   */
  public void up(Event evt) {
    passUp(evt);

    switch (evt.getType()) {
      case Event.CONFIG:
        passUp(evt);
        if (Trace.trace) {
          Trace.info("UDP.up()", "received CONFIG event: " + evt.getArg());
        }
        handleConfigEvent((HashMap) evt.getArg());
        return;
    }

    passUp(evt);
  }
Пример #3
0
 protected void _connect(Event connect_event) throws Exception {
   try {
     down(connect_event);
   } catch (Throwable t) {
     stopStack(true, false);
     state = State.OPEN;
     init();
     throw new Exception("connecting to channel \"" + connect_event.getArg() + "\" failed", t);
   }
 }
Пример #4
0
  public Object up(Event evt) {
    Message msg;
    Address dst, src;
    Unicast2Header hdr;

    switch (evt.getType()) {
      case Event.MSG:
        msg = (Message) evt.getArg();
        dst = msg.getDest();

        if (dst == null || msg.isFlagSet(Message.NO_RELIABILITY)) // only handle unicast messages
        break; // pass up

        // changed from removeHeader(): we cannot remove the header because if we do loopback=true
        // at the
        // transport level, we will not have the header on retransmit ! (bela Aug 22 2006)
        hdr = (Unicast2Header) msg.getHeader(this.id);
        if (hdr == null) break;
        src = msg.getSrc();
        switch (hdr.type) {
          case Unicast2Header.DATA: // received regular message
            handleDataReceived(src, hdr.seqno, hdr.conn_id, hdr.first, msg, evt);
            return null; // we pass the deliverable message up in handleDataReceived()
          case Unicast2Header.XMIT_REQ: // received ACK for previously sent message
            handleXmitRequest(src, hdr.seqno, hdr.high_seqno);
            break;
          case Unicast2Header.SEND_FIRST_SEQNO:
            handleResendingOfFirstMessage(src, hdr.seqno);
            break;
          case Unicast2Header.STABLE:
            stable(msg.getSrc(), hdr.conn_id, hdr.seqno, hdr.high_seqno);
            break;
          default:
            log.error("UnicastHeader type " + hdr.type + " not known !");
            break;
        }
        return null;
    }

    return up_prot.up(evt); // Pass up to the layer above us
  }
Пример #5
0
  void handleDownEvent(Event evt) {
    switch (evt.getType()) {
      case Event.TMP_VIEW:
      case Event.VIEW_CHANGE:
        synchronized (members) {
          members.removeAllElements();
          Vector tmpvec = ((View) evt.getArg()).getMembers();
          for (int i = 0; i < tmpvec.size(); i++) {
            members.addElement(tmpvec.elementAt(i));
          }
        }
        break;

      case Event.GET_LOCAL_ADDRESS: // return local address -> Event(SET_LOCAL_ADDRESS, local)
        passUp(new Event(Event.SET_LOCAL_ADDRESS, local_addr));
        break;

      case Event.CONNECT:
        group_addr = (String) evt.getArg();
        udp_hdr = new UdpHeader(group_addr);

        // removed March 18 2003 (bela), not needed (handled by GMS)
        // changed July 2 2003 (bela): we discard CONNECT_OK at the GMS level anyway, this might
        // be needed if we run without GMS though
        passUp(new Event(Event.CONNECT_OK));
        break;

      case Event.DISCONNECT:
        passUp(new Event(Event.DISCONNECT_OK));
        break;

      case Event.CONFIG:
        if (Trace.trace) {
          Trace.info("UDP.down()", "received CONFIG event: " + evt.getArg());
        }
        handleConfigEvent((HashMap) evt.getArg());
        break;
    }
  }
Пример #6
0
  /**
   * Caller by the layer above this layer. Usually we just put this Message into the send queue and
   * let one or more worker threads handle it. A worker thread then removes the Message from the
   * send queue, performs a conversion and adds the modified Message to the send queue of the layer
   * below it, by calling Down).
   */
  public void down(Event evt) {
    Message msg;
    Object dest_addr;

    if (evt.getType() != Event.MSG) { // unless it is a message handle it and respond
      handleDownEvent(evt);
      return;
    }

    // ****************** profiling ******************
    /*if(num_msgs == 0) {
    start=System.currentTimeMillis();
    num_msgs++;
         }
         else if(num_msgs >= 1000) {
    stop=System.currentTimeMillis();

    long total_time=stop-start;
    double msgs_per_msec=num_msgs / (double)total_time;

    if(Trace.trace)
        Trace.info("UDP.down.profile()",
                "total_time=" + total_time + ", msgs/ms=" + msgs_per_msec);
    num_msgs=0;
         }
         else {
    num_msgs++;
         }*/
    // ****************** profiling ******************

    msg = (Message) evt.getArg();

    if (udp_hdr != null && udp_hdr.group_addr != null) {
      // added patch by Roland Kurmann (March 20 2003)
      msg.putHeader(name, udp_hdr);
    }

    dest_addr = msg.getDest();

    // Because we don't call Protocol.passDown(), we notify the observer directly (e.g.
    // PerfObserver).
    // This way, we still have performance numbers for UDP
    if (observer != null) {
      observer.passDown(evt);
    }
    if (dest_addr == null) { // 'null' means send to all group members
      if (ip_mcast) {
        if (mcast_addr == null) {
          Trace.error(
              "UDP.down()",
              "dest address of message is null, and "
                  + "sending to default address fails as mcast_addr is null, too !"
                  + " Discarding message "
                  + Util.printEvent(evt));
          return;
        }
        // if we want to use IP multicast, then set the destination of the message
        msg.setDest(mcast_addr);
      } else {
        // sends a separate UDP message to each address
        sendMultipleUdpMessages(msg, members);
        return;
      }
    }

    try {
      sendUdpMessage(msg);
    } catch (Exception e) {
      Trace.error("UDP.down()", "exception=" + e + ", msg=" + msg + ", mcast_addr=" + mcast_addr);
    }
  }
Пример #7
0
  public Object down(Event evt) {
    switch (evt.getType()) {
      case Event.MSG: // Add UnicastHeader, add to AckSenderWindow and pass down
        Message msg = (Message) evt.getArg();
        Address dst = msg.getDest();

        /* only handle unicast messages */
        if (dst == null || msg.isFlagSet(Message.NO_RELIABILITY)) break;

        if (!started) {
          if (log.isTraceEnabled())
            log.trace("discarded message as start() has not yet been called, message: " + msg);
          return null;
        }

        SenderEntry entry = send_table.get(dst);
        if (entry == null) {
          entry = new SenderEntry(getNewConnectionId());
          SenderEntry existing = send_table.putIfAbsent(dst, entry);
          if (existing != null) entry = existing;
          else {
            if (log.isTraceEnabled())
              log.trace(
                  local_addr
                      + ": created connection to "
                      + dst
                      + " (conn_id="
                      + entry.send_conn_id
                      + ")");
            if (cache != null && !members.contains(dst)) cache.add(dst);
          }
        }

        long seqno = -2;
        short send_conn_id = -1;
        Unicast2Header hdr;

        entry.lock(); // threads will only sync if they access the same entry
        try {
          seqno = entry.sent_msgs_seqno;
          send_conn_id = entry.send_conn_id;
          hdr = Unicast2Header.createDataHeader(seqno, send_conn_id, seqno == DEFAULT_FIRST_SEQNO);
          msg.putHeader(this.id, hdr);
          entry.sent_msgs.addToMessages(
              seqno, msg); // add *including* UnicastHeader, adds to retransmitter
          entry.sent_msgs_seqno++;
          entry.update();
        } finally {
          entry.unlock();
        }

        if (log.isTraceEnabled()) {
          StringBuilder sb = new StringBuilder();
          sb.append(local_addr)
              .append(" --> DATA(")
              .append(dst)
              .append(": #")
              .append(seqno)
              .append(", conn_id=")
              .append(send_conn_id);
          if (hdr.first) sb.append(", first");
          sb.append(')');
          log.trace(sb);
        }

        try {
          down_prot.down(evt);
          num_msgs_sent++;
          num_bytes_sent += msg.getLength();
        } catch (Throwable t) {
          log.warn("failed sending the message", t);
        }
        return null; // we already passed the msg down

      case Event.VIEW_CHANGE: // remove connections to peers that are not members anymore !
        View view = (View) evt.getArg();
        List<Address> new_members = view.getMembers();
        Set<Address> non_members = new HashSet<Address>(send_table.keySet());
        non_members.addAll(recv_table.keySet());

        synchronized (members) {
          members.clear();
          if (new_members != null) members.addAll(new_members);
          non_members.removeAll(members);
          if (cache != null) {
            cache.removeAll(members);
          }
        }

        if (!non_members.isEmpty()) {
          if (log.isTraceEnabled()) log.trace("removing non members " + non_members);
          for (Address non_mbr : non_members) removeConnection(non_mbr);
        }
        break;

      case Event.SET_LOCAL_ADDRESS:
        local_addr = (Address) evt.getArg();
        break;
    }

    return down_prot.down(evt); // Pass on to the layer below us
  }
Пример #8
0
  public Object down(Event evt) {
    switch (evt.getType()) {
      case Event.MSG: // Add UnicastHeader, add to AckSenderWindow and pass down
        Message msg = (Message) evt.getArg();
        Address dst = msg.getDest();

        /* only handle unicast messages */
        if (dst == null || msg.isFlagSet(Message.NO_RELIABILITY)) break;

        if (!running) {
          if (log.isTraceEnabled())
            log.trace("discarded message as start() has not yet been called, message: " + msg);
          return null;
        }

        SenderEntry entry = send_table.get(dst);
        if (entry == null) {
          entry = new SenderEntry(getNewConnectionId());
          SenderEntry existing = send_table.putIfAbsent(dst, entry);
          if (existing != null) entry = existing;
          else {
            if (log.isTraceEnabled())
              log.trace(
                  local_addr
                      + ": created connection to "
                      + dst
                      + " (conn_id="
                      + entry.send_conn_id
                      + ")");
            if (cache != null && !members.contains(dst)) cache.add(dst);
          }
        }

        short send_conn_id = entry.send_conn_id;
        long seqno = entry.sent_msgs_seqno.getAndIncrement();
        long sleep = 10;
        while (running) {
          try {
            msg.putHeader(
                this.id,
                Unicast2Header.createDataHeader(seqno, send_conn_id, seqno == DEFAULT_FIRST_SEQNO));
            entry.sent_msgs.add(seqno, msg); // add *including* UnicastHeader, adds to retransmitter
            if (conn_expiry_timeout > 0) entry.update();
            break;
          } catch (Throwable t) {
            if (!running) break;
            if (log.isWarnEnabled()) log.warn("failed sending message", t);
            Util.sleep(sleep);
            sleep = Math.min(5000, sleep * 2);
          }
        }

        if (log.isTraceEnabled()) {
          StringBuilder sb = new StringBuilder();
          sb.append(local_addr)
              .append(" --> DATA(")
              .append(dst)
              .append(": #")
              .append(seqno)
              .append(", conn_id=")
              .append(send_conn_id);
          if (seqno == DEFAULT_FIRST_SEQNO) sb.append(", first");
          sb.append(')');
          log.trace(sb);
        }

        try {
          down_prot.down(evt);
          num_msgs_sent++;
        } catch (Throwable t) {
          log.warn("failed sending the message", t);
        }
        return null; // we already passed the msg down

      case Event.VIEW_CHANGE: // remove connections to peers that are not members anymore !
        View view = (View) evt.getArg();
        List<Address> new_members = view.getMembers();
        Set<Address> non_members = new HashSet<Address>(send_table.keySet());
        non_members.addAll(recv_table.keySet());

        members = new_members;
        non_members.removeAll(new_members);
        if (cache != null) cache.removeAll(new_members);

        if (!non_members.isEmpty()) {
          if (log.isTraceEnabled()) log.trace("removing non members " + non_members);
          for (Address non_mbr : non_members) removeConnection(non_mbr);
        }
        break;

      case Event.SET_LOCAL_ADDRESS:
        local_addr = (Address) evt.getArg();
        break;
    }

    return down_prot.down(evt); // Pass on to the layer below us
  }
Пример #9
0
  /**
   * Callback method <br>
   * Called by the ProtocolStack when a message is received.
   *
   * @param evt the event carrying the message from the protocol stack
   */
  public Object up(Event evt) {
    switch (evt.getType()) {
      case Event.MSG:
        Message msg = (Message) evt.getArg();
        if (stats) {
          received_msgs++;
          received_bytes += msg.getLength();
        }

        // discard local messages (sent by myself to me)
        if (discard_own_messages
            && local_addr != null
            && msg.getSrc() != null
            && local_addr.equals(msg.getSrc())) return null;
        break;

      case Event.VIEW_CHANGE:
        View tmp = (View) evt.getArg();
        if (tmp instanceof MergeView) my_view = new View(tmp.getViewId(), tmp.getMembers());
        else my_view = tmp;

        // Bela&Vladimir Oct 27th,2006 (JGroups 2.4): we need to set connected=true because a client
        // can
        // call channel.getView() in viewAccepted() callback invoked on this thread (see
        // Event.VIEW_CHANGE handling below)

        // not good: we are only connected when we returned from connect() - bela June 22 2007
        // Changed: when a channel gets a view of which it is a member then it should be
        // connected even if connect() hasn't returned yet ! (bela Noc 2010)
        if (state != State.CONNECTED) state = State.CONNECTED;
        break;

      case Event.CONFIG:
        Map<String, Object> cfg = (Map<String, Object>) evt.getArg();
        if (cfg != null) {
          if (cfg.containsKey("state_transfer")) {
            state_transfer_supported = (Boolean) cfg.get("state_transfer");
          }
          if (cfg.containsKey("flush_supported")) {
            flush_supported = (Boolean) cfg.get("flush_supported");
          }
        }
        break;

      case Event.GET_STATE_OK:
        StateTransferResult result = (StateTransferResult) evt.getArg();
        if (up_handler != null) {
          try {
            Object retval = up_handler.up(evt);
            state_promise.setResult(new StateTransferResult());
            return retval;
          } catch (Throwable t) {
            state_promise.setResult(new StateTransferResult(t));
          }
        }

        if (receiver != null) {
          try {
            if (result.hasBuffer()) {
              byte[] tmp_state = result.getBuffer();
              ByteArrayInputStream input = new ByteArrayInputStream(tmp_state);
              receiver.setState(input);
            }
            state_promise.setResult(result);
          } catch (Throwable t) {
            state_promise.setResult(new StateTransferResult(t));
          }
        }
        break;

      case Event.STATE_TRANSFER_INPUTSTREAM_CLOSED:
        state_promise.setResult((StateTransferResult) evt.getArg());
        break;

      case Event.STATE_TRANSFER_INPUTSTREAM:
        // Oct 13,2006 moved to down() when Event.STATE_TRANSFER_INPUTSTREAM_CLOSED is received
        // state_promise.setResult(is != null? Boolean.TRUE : Boolean.FALSE);

        if (up_handler != null) return up_handler.up(evt);

        InputStream is = (InputStream) evt.getArg();
        if (is != null && receiver != null) {
          try {
            receiver.setState(is);
          } catch (Throwable t) {
            throw new RuntimeException("failed calling setState() in state requester", t);
          }
        }
        break;

      case Event.STATE_TRANSFER_OUTPUTSTREAM:
        if (receiver != null && evt.getArg() != null) {
          try {
            receiver.getState((OutputStream) evt.getArg());
          } catch (Exception e) {
            throw new RuntimeException("failed calling getState() in state provider", e);
          }
        }
        break;

      case Event.GET_LOCAL_ADDRESS:
        return local_addr;

      default:
        break;
    }

    // If UpHandler is installed, pass all events to it and return (UpHandler is e.g. a building
    // block)
    if (up_handler != null) return up_handler.up(evt);

    if (receiver != null) return invokeCallback(evt.getType(), evt.getArg());
    return null;
  }