I guess you need to return a source built with the builder. Other problem
is you build a ClosedGraph in ~> flow ~> sink
Em terça-feira, 8 de novembro de 2016 22:49:31 UTC-3, Eugene Dzhurinsky
escreveu:
>
> Got some time to experiment: with this definition
>
> val fetchLikesAndUpdateProfile = Flow[(OptProfile,
> LikesAndCount)].flatMapConcat
> {
> case (Some(profile), (likesExpected, stream)) ⇒ GraphDSL.create() {
> implicit builder ⇒
> import GraphDSL.Implicits._
>
> val in = builder.add(Source(stream))
> val profileLikesSink = builder.add(FileIO.toPath(new File(base,
> s"likes_${profile.id}").toPath))
> in ~> Flow.fromFunction[Profile.Profile, ByteString](p ⇒
> ByteString(s"${p.id}:${p.username}\n")) ~> profileLikesSink
> // update profile here with the numbers of records and emit i
> Source.single(profile).shape
> }
> }
>
>
> The graph is teared at runtime:
>
>
> java.lang.IllegalArgumentException: requirement failed: The inlets [] and
> outlets [single.out] must correspond to the inlets [] and outlets []
> at scala.Predef$.require(Predef.scala:219)
> at akka.stream.Shape.requireSamePortsAs(Shape.scala:168)
> at akka.stream.impl.StreamLayout$CompositeModule.replaceShape(
> StreamLayout.scala:426)
> at akka.stream.scaladsl.GraphApply$class.create(GraphApply.scala:19)
> at akka.stream.scaladsl.GraphDSL$.create(Graph.scala:993)
> at sample.Aggregate$$anonfun$6.apply(Aggregate.scala:112)
> at sample.Aggregate$$anonfun$6.apply(Aggregate.scala:111)
>
>
> Looks like it doesn't like *Source.single(profile).shape *but the type of
> the result should be *Graph[SourceShape[T],M]*, and I assume that the
> SourceShape should actually emit the updated profile object. Can somebody
> please explain how is it supposed to work, cuz I'm lost?
>
> Thanks!
>
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