Spring Cloud Stream RabbitMQ add Queue argument - rabbitmq

Question

I would like to know how to add extra arguments to a rabbitmq queue declared with spring cloud stream.
I want to use the Single Active Consumer feature for RabbitMQ 3.8.x. To do that I have to add an extra argument to the queue declaration x-single-active-consumer.
There is no way to configure it directly with spring properties.

Answer 1

Setting arbitrary queue arguments is not currently supported by spring cloud stream.
Please open a GitHub issue against the binder to request a new feature.
However, you can simply declare the queue by adding a Queue #Bean to the application with the argument set.
Or, you can simply set the exclusive consumer binder properties, which provides similar semantics; the competing consumers will periodically attempt to reconnect.
EDIT
#SpringBootApplication
#EnableBinding(Sink.class)
public class So59011707Application {
public static void main(String[] args) {
SpringApplication.run(So59011707Application.class, args);
}
#StreamListener(Sink.INPUT)
public void listen(String in) {
System.out.println(in);
}
#Bean
Queue queue() {
return QueueBuilder.durable("so59011707.myGroup")
.withArgument("x-single-active-consumer", true)
.build();
}
#Bean
public ApplicationRunner runner(RabbitTemplate template) {
return args -> {
template.convertAndSend("so59011707", "", "foo");
};
}
}
and
spring.cloud.stream.bindings.input.destination=so59011707
spring.cloud.stream.bindings.input.group=myGroup
You will see an error message in the log
2019-11-24 10:24:22.310 ERROR 83004 --- [ 127.0.0.1:5672] o.s.a.r.c.CachingConnectionFactory : Channel shutdown: channel error; protocol method: #method(reply-code=406, reply-text=PRECONDITION_FAILED - inequivalent arg 'x-single-active-consumer' for queue 'so59011707.myGroup' in vhost '/': received none but current is the value 'true' of type 'bool', class-id=50, method-id=10)
which you can ignore. Or you can avoid it by setting bindQueue to false and add Exchange and Binding #Beans as well...
spring.cloud.stream.rabbit.bindings.input.consumer.bind-queue=false
#Bean
Binding binding() {
return BindingBuilder.bind(queue())
.to(exchange())
.with("#");
}
#Bean
TopicExchange exchange() {
return new TopicExchange("so59011707");
}