Flow hangs when IdempotentReceiverInterceptor discards the message(after 4-th message)

Question

I have following flow:

    return flow -> flow.channel(inputChannel())
             ... 
            .gateway(childFlow, addMyInterceptor(str)); // by name
}


Consumer<GatewayEndpointSpec> addMyInterceptor(String objectIdHeader) {
    return endpointSpec -> endpointSpec.advice(addMyInterceptorInternal(objectIdHeader))
            .errorChannel(errorChannel());
}

default IdempotentReceiverInterceptor addMyInterceptorInternal(String header) {
    MessageProcessor<String> headerSelector = message -> headerExpression(header).apply(message);
    var interceptor = new IdempotentReceiverInterceptor(new MetadataStoreSelector(headerSelector, idempotencyStore()));
    interceptor.setDiscardChannel(idempotentDiscardChannel());
    return interceptor;
}

When IdempotentReceiverInterceptor encounters that message is duplicated - I see that application hangs on after 4-th duplicated message. I understand that it is because gateway expected response(like here: PubSubInboundChannelAdapter stops to receive messages after 4th message) but I don't have any ideas how to return result from interceptor.

Could you please explain it for me?

score 1 · Accepted Answer · answered Dec 02 '19 at 16:39

1

As long as all channels are direct (default) - i.e. no async handoffs in the flow using queue or executor channels, set the gateway's replyTimeout to 0 when the flow might not return a reply

answered Dec 02 '19 at 16:39

Gary Russell

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Tried this approach but messages were stopped to reject. Will investigate in more details. – gstackoverflow Dec 02 '19 at 17:53
Rechecked one more time and see that everything is working properly – gstackoverflow Dec 03 '19 at 12:41

Flow hangs when IdempotentReceiverInterceptor discards the message(after 4-th message)

1 Answers1