Add support for throttling the number of JMS Messages dequeued for a particular event type.
Allow JMS Message TTL values to be set.
Add DrainEvent to allow latches to short-circuit waiting if the EventDispatch is shut down.
Register Receiver methods declared in superclasses.
Add ReceiverScope.getEventStack() to supplement CurrentEvent injection.
Send a DispatchCompleteEvent when an EventObserver has suppressed the event.