public class DeadLetteringEventHandlerInvoker extends SimpleEventHandlerInvoker implements SequencedDeadLetterProcessor<EventMessage<?>>
EventHandlerInvoker utilizing a SequencedDeadLetterQueue to enqueue
events for which handling failed.
Will use an EnqueuePolicy to deduce whether failed event handling should result in an
enqueue operation. Subsequent events belonging to an
already contained "sequence identifier", according to the SequencingPolicy, are also enqueued. This ensures
event ordering is maintained in face of failures.
This dead lettering invoker provides several operations to process
dead letters it has enqueued. It will ensure the same set of Event Handling Components is invoked
as with regular event handling when processing a dead letter. These methods will try to process an entire sequence of
dead letters. Furthermore, these are exposed through the SequencedDeadLetterProcessor contract.
| Modifier and Type | Class and Description |
|---|---|
static class |
DeadLetteringEventHandlerInvoker.Builder
Builder class to instantiate a
DeadLetteringEventHandlerInvoker. |
| Modifier | Constructor and Description |
|---|---|
protected |
DeadLetteringEventHandlerInvoker(DeadLetteringEventHandlerInvoker.Builder builder)
Instantiate a dead-lettering
EventHandlerInvoker based on the given builder. |
| Modifier and Type | Method and Description |
|---|---|
static DeadLetteringEventHandlerInvoker.Builder |
builder()
Instantiate a builder to construct a
DeadLetteringEventHandlerInvoker. |
void |
handle(EventMessage<?> message,
Segment segment)
Handle the given
message for the given segment. |
void |
performReset()
Performs any activities that are required to reset the state managed by handlers assigned to this invoker.
|
<R> void |
performReset(R resetContext)
Performs any activities that are required to reset the state managed by handlers assigned to this invoker.
|
boolean |
process(Predicate<DeadLetter<? extends EventMessage<?>>> sequenceFilter)
Process a sequence of
dead letters matching the given sequenceFilter. |
canHandle, canHandleType, eventHandlers, getListenerInvocationErrorHandler, getSequencingPolicy, invokeHandlers, sequenceIdentifier, sequencingPolicyMatchesSegment, supportsResetclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitprocessAnyprotected DeadLetteringEventHandlerInvoker(DeadLetteringEventHandlerInvoker.Builder builder)
EventHandlerInvoker based on the given builder. Uses a
SequencedDeadLetterQueue to maintain and retrieve dead letters from.builder - The DeadLetteringEventHandlerInvoker.Builder used to instantiate a DeadLetteringEventHandlerInvoker instance.public static DeadLetteringEventHandlerInvoker.Builder builder()
DeadLetteringEventHandlerInvoker.
The EnqueuePolicy defaults to returning Decisions.enqueue(Throwable) when invoked, the
ListenerInvocationErrorHandler is defaulted to a PropagatingErrorHandler, the
SequencingPolicy to a SequentialPerAggregatePolicy, and allowReset defaults to
false. Providing at least one Event Handler, a SequencedDeadLetterQueue, and a
TransactionManager are hard requirements and as such should be provided.
DeadLetteringEventHandlerInvoker.public void handle(@Nonnull EventMessage<?> message, @Nonnull Segment segment) throws Exception
EventHandlerInvokermessage for the given segment.
Callers are recommended to invoke EventHandlerInvoker.canHandle(EventMessage, Segment) prior to invocation, but aren't
required to do so. Implementations must ensure to take the given segment into account when processing messages.
handle in interface EventHandlerInvokerhandle in class SimpleEventHandlerInvokermessage - The message to handlesegment - The segment for which to handle the messageException - when an exception occurs while handling the messagepublic void performReset()
EventHandlerInvokerperformReset in interface EventHandlerInvokerperformReset in class SimpleEventHandlerInvokerpublic <R> void performReset(R resetContext)
EventHandlerInvokerperformReset in interface EventHandlerInvokerperformReset in class SimpleEventHandlerInvokerR - the type of the provided resetContextresetContext - a R used to support the reset operationpublic boolean process(Predicate<DeadLetter<? extends EventMessage<?>>> sequenceFilter)
SequencedDeadLetterProcessordead letters matching the given sequenceFilter.
Note that only a single matching sequence is processed! Furthermore, the sequenceFilter is
only invoked for the first letter of a sequence, as the first entry blocks the entire sequence.
process in interface SequencedDeadLetterProcessor<EventMessage<?>>sequenceFilter - A filter for the first dead letter entries of each sequence.true if at least one dead letter was processed successfully, false
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