Gateway proxies should support the @Payload annotation on parameters [INT-894]

[spring-operator]

Mark Fisher opened INT-894 and commented

Example:

public interface TestGateway {

    void sayHello(@Payload String name);

}

When the Message is created the annotated value will become the payload. Is there any value in supporting an expression in the annotation like we do for mapping from Messages to arguments, e.g.

void sayHello(@Payload("username") AccountProfile accountProfile);

... probably not.

NOTE: there can be only one per method, and there can only be one of @Payload/@Header/@Headers on any given parameter.

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No further details from INT-894

[spring-operator]

Mark Fisher commented

@Payload is now supported on gateway method parameters, but we still need to enforce that only ONE parameter per-method has this annotation. We also need to throw an Exception if any expression value is provided inside the @Payload annotation (unless there is a valid use for that when mapping in this direction).