Manual ack with Spring Cloud Stream RabbitMQ

Question

I'm trying to setup a scenario where the listeners will manually send ACK to RabbitMQ. I have this in my application.properties

spring.cloud.stream.rabbit.bindings.input.consumer.acknowledge-mode=MANUAL

How do I send an ack from the listener? I see from Manual Acknowledgement of Messages : Spring Cloud Stream Kafka that for Kafka, we create an Acknowledgement object and call acknowledge() in it. Is there an example for RabbitMQ to do the same?

Answer 1

See the Spring Integration Reference Manual. The message has two headers, AmqpHeaders.CHANNEL and AmqpHeaders.DELIVERY_TAG.

You need to call basicAck on the channel, passing in the delivery tag.

Answer 2

@StreamListener(target = BAR)
public void handlerMethod(@Payload Foo foo,
                          @Header(AmqpHeaders.CHANNEL) Channel channel,
                          @Header(AmqpHeaders.DELIVERY_TAG) Long deliveryTag) {
    ...
    channel.basickAck(deliveryTag, false);
}

The headers are added in automatic way by RabbitMQ so you can use them out of the box with your setting.