I didn't know about existence of Partition fan-out since it's not in the
documentation but I just saw in akka sources. Thus here is shorter version
of "bad" flow
val badFlow = Flow.fromGraph(GraphDSL.create() { implicit builder =>
import GraphDSL.Implicits._
val mergeEntrance = builder.add(MergePreferred[Int](1))
val mergePreExit = builder.add(Merge[Int](2))
val part1 = builder.add(Partition[Int](2, (i: Int) => if (i == 1) 1 else 0 ))
val part2 = builder.add(Partition[Int](2, (i: Int) => if (i == 1) 0 else 1 ))
mergeEntrance.out ~> part1.in
part1.out(0) ~> mergePreExit.in(0)
part2.in <~ Flow[Int].collect{
case v if v == 1 =>
-1
} <~ part1.out(1)
mergeEntrance.preferred <~ part2.out(0)
part2.out(1) ~> mergePreExit.in(1)
FlowShape.of(mergeEntrance.in(0), mergePreExit.out)})
--
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>>>>>>>>>> Check the FAQ:
>>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html
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