Github user bozzzzo commented on a diff in the pull request:

    https://github.com/apache/qpid-proton/pull/48#discussion_r36179971
  
    --- Diff: 
proton-j/src/main/java/org/apache/qpid/proton/engine/impl/CollectorImpl.java ---
    @@ -57,9 +58,13 @@ public void pop()
             }
         }
     
    -    public EventImpl put(Event.Type type, Object context)
    +    public EventImpl put(EventType type, Object context)
         {
    -        if (tail != null && tail.getType() == type &&
    +        if (type == null)
    +            throw new IllegalArgumentException("Type cannot be null");
    +        if (!type.isValid())
    +            throw new IllegalArgumentException("Cannot put events of type 
" + type);
    +        if (tail != null && tail.getEventType() == type &&
    --- End diff --
    
    Frankly, I'm not even sure why this check is needed at all.
    But extensibe events don't need to change collector semantics. the change 
here is
    a mostly about robustness and a bit about the fact that not only core 
events are now possible.
    If needed this should be a separate change with separate justification.


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