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From gemmellr <...@git.apache.org>
Subject [GitHub] activemq-artemis pull request #1140: ARTEMIS-1056 Better event processing
Date Tue, 28 Mar 2017 12:00:01 GMT
Github user gemmellr commented on a diff in the pull request:

    https://github.com/apache/activemq-artemis/pull/1140#discussion_r108398829
  
    --- Diff: artemis-protocols/artemis-amqp-protocol/src/main/java/org/apache/activemq/artemis/protocol/amqp/proton/handler/ProtonHandler.java
---
    @@ -322,17 +308,22 @@ private void dispatch() {
           // because we could have a distributed deadlock
           // while processing events (for instance onTransport)
           // while a client is also trying to write here
    -      while ((ev = popEvent()) != null) {
    -         for (EventHandler h : handlers) {
    -            if (log.isTraceEnabled()) {
    -               log.trace("Handling " + ev + " towards " + h);
    -            }
    -            try {
    -               Events.dispatch(ev, h);
    -            } catch (Exception e) {
    -               log.warn(e.getMessage(), e);
    -               connection.setCondition(new ErrorCondition());
    +
    +      synchronized (lock) {
    +         while ((ev = collector.peek()) != null) {
    +            for (EventHandler h : handlers) {
    +               if (log.isTraceEnabled()) {
    +                  log.trace("Handling " + ev + " towards " + h);
    +               }
    +               try {
    +                  Events.dispatch(ev, h);
    +               } catch (Exception e) {
    +                  log.warn(e.getMessage(), e);
    +                  connection.setCondition(new ErrorCondition());
    --- End diff --
    
    Its not clear what the intent is here (and in similar snippet further down the method),
but I'm not sure this will be having the desired effect.
    
    Setting a brand new ErrorCondition like this will effectively clear any error details
for the connection, which are actually the condition/description/info-map details stored inside
an ErrorCondition object, which will be empty for the new instance. Setting a condition inside
the ErrorCondition doesn't itself lead to it being sent, the endpoint subsequently needs closed
before the details are included in the detach/end/close frame then being sent. The connection
may not be the right endpoint to set an error, e.g it might be a particular link receiving
a delivery event and so that link might be the endpoint to update.


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