Spring Cloud Stream Function 支持不起作用

Question

I trying to use Spring Cloud Stream with functions as that described in this topic . But it does not work.

My function:

@SpringBootApplication
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class);
    }

    @Bean
    public Consumer<String> consumer() {
        return s -> System.out.println(s);
    }
}

And I push message. to the consumer-in-0 channel via producer that made with @Output annotation:

pulic interface Source {
    @Output("source")
    MessageChannel producer();
}

source.producer().send(MessageBuilder.withPayload("Hello").build());

My yaml channels configuration:

spring:
    cloud:
        function:
            definition: consumer
        stream:
            bindings:
                source:
                    destination: consumer-in-0

If I use consumer via @Input configuration - everything ok. Also in rabbitmq manager I see that producer is working and sending messages, but consumer does not consuming them. Help me please somebody.

PS I also use Spring WebFlux

Answer 1

You cannot mix EnableBinding and functional model in the same application. If you are putting both producer and consumer in the same application, you might want to convert your producer using a Supplier . For eg

@Bean
public Supplier<String> supplier() {
  return () -> MessageBuilder.withPayload("Hello").build();

}

Then,

spring:
    cloud:
        function:
            definition: supplier;consumer
        stream:
            bindings:
                supplier-out-0:
                    destination: consumer-in-0