Spring Integration DSL equivalent of <int:gateway … />

Question

What would be the Spring Integration DSL way of creating the equivalent of

<int:gateway service-interface="MyService" default-request-channel="myService.inputChannel"/>

// where my existing interface looks like
interface MyService { process(Foo foo); }

I've not been able to find a factory in org.springframework.integration.dsl and none of argument lists for IntegrationFlows.from(...) are helping self discovery.

It sort of feels like I'm missing something like a Java protocol adaptor from https://github.com/spring-projects/spring-integration-java-dsl/wiki/Spring-Integration-Java-DSL-Reference#using-protocol-adapters.

// I imagine this is what I can't find
IntegrationFlows.from(Java.gateway(MyService.class)
    .channel("myService.inputChannel")
    .get();

The only thing I've come across is on an old blog post, but it seems to require annotating the interface with @MessagingGateway and @Gateway, which I'd like to avoid. See https://spring.io/blog/2014/11/25/spring-integration-java-dsl-line-by-line-tutorial

Artem Bilan Artem Bilan · Accepted Answer · 2017-08-03T15:13:08

We have done that recently in Spring Integration 5.0. With that you really can do this:

@Bean
public IntegrationFlow controlBusFlow() {
    return IntegrationFlows.from(ControlBusGateway.class)
            .controlBus()
            .get();
}

public interface ControlBusGateway {

    void send(String command);
}

See more info in the latest blog post.

Right now you don't have choice unless declare @MessagingGateway on the interface and start the flow from the request channel for that gateway definition.

Spring Integration DSL equivalent of <int:gateway … />

1 Answers