If you need to consume messages from a number of Sources that are created 
at run time you probably need to use a MergeHub
http://doc.akka.io/docs/akka/2.4/scala/stream/stream-dynamic.html#dynamic-fan-in-and-fan-out-with-mergehub-and-broadcasthub

cheers,
Rafał

W dniu czwartek, 8 grudnia 2016 21:21:08 UTC+1 użytkownik [email protected] 
napisał:
>
> Hi,
>
> I'm creating a Source via GraphStageLogic which makes calls to another 
> api, which happens to return a Source. However I'm unsure how to deal with 
> Source/Futures in a GraphStageLogic. It seems that I want my shape to look 
> like
>
> val shape: SourceShape[Seq[String]] = SourceShape(out)
>
>
> but I get back a Source[ByteString, NotUsed] which I can covert to 
> Future[Seq[String]] 
> via runWith(Sink.seq). So should I make my shape
>
> val shape: SourceShape[Future[Seq[String]]] = SourceShape(out)
>
>
> But then I need to materialize the Source inside the onPull(), which 
> doesn't seem right. Is there a better way to handle this situation?
>
> Thanks!
>

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