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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