Hi All,

Hopefully a quick one asking for some advice/pointers on how to marshal and
complete a HTTP route using CompletionStage<SomeBean>.

I've taken a look through the latest v2.5.6 documentation inc. The
PetClinic example. What I am trying to do is very similar - marshalling a
response from a high level server side API - but unlike in PetClinic where
it can do:
"return complete(StatusCodes.OK, thePet, Jackson.<Pet>marshaller());"

Where we have thePet variable of type 'Pet' i have an CompletionStage<Pet>
since I have PatternsCS.ask'ed an actor to respond to the request.

What confuses me is that the signature for 'complete' directive is:
RouteAdapter complete(StatusCode status, T value, Marshaller<T,
*RequestEntity*> marshaller)

In other words it is the marshaller purely just for the entity that I
return in my response - Great as I can simply use Jackson.marshaller().
But the equivalent method that takes in a CompletionStage is:
RouteAdapter completeWithFuture(CompletionStage<T> value, Marshaller<T,
*HttpResponse*> marshaller)

In other words my CompletionStage<Pet> must have a marshaller which can
convert Pet to the whole HttpResponse - headers, statusCode and entity
included - Meaning I now have to write some kind of mixed
Marshaller/Business pojo to HttpResponse mapper.

PetClinic link:
https://github.com/akka/akka/blob/v2.4.6/akka-http-tests/src/main/java/akka/http/javadsl/server/examples/petstore/PetStoreExample.java

Thanks hugely!
Dan

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Daniel Stoner | Senior Software Engineer UtopiaIT | Ocado Technology
[email protected] | Ext 7969 | www.ocadotechnology.com

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