1. jaxrs-spec@javaee.groups.io

Re: Question on CompletionStage

Pavel Bucek
 

Hi Markus,

confirming what you wrote would be extending of what is pretty explicitly written in the spec, so I can't do that.

Currently, the behavior is "defined" by what AsyncResponse provides and there is nothing like you mentioned there, so I don't think that the usecase you described is supported - returned Observable (or any other type) will be processed as any other type, so the pipeline will be triggered right after the object is returned from the resource method.

Returning CompletionStage is equal to invoking AsyncResponse#resume in CompletionStage#whenComplete callback, nothing more, nothing less..

Regards,
Pavel


On 18/08/2017 17:23, Markus KARG wrote:

Pavel,

 

as the spec does not explicitly mention it, can you please confirm that what the spec actually wants to say is that CompletionStage does not only imply async when declared as a method's return type, but also when CompletionStage is de-facto returned by a method or by a interceptor (i. e. the method itself is not declared to return CompletionStage, but might return Object and an interceptor produces a CompletionStage from that)? This would allow framework providers to provide "JAX-RS adapter" like an interceptor turning RxJava's Observable into Java 8's CompletionStage. The spec is a bit short here.

 

Thanks

-Markus
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