FlexiMerge seems to be a valid solution to this problem : class BypassMerge[A, B] extends FlexiMerge[A, FanInShape2[A, B, A]](new FanInShape2("BypassMerge"), OperationAttributes.name("BypassMerge")) { def createMergeLogic(p: PortT): MergeLogic[A] = new MergeLogic[A] {
val readA: State[A] = State[A](Read(p.in0)) { (ctx, input, element) ⇒ ctx.emit(element) readA } val readB: State[B] = State[B](Read(p.in1)) { (ctx, input, element) ⇒ readB } override def initialCompletionHandling = CompletionHandling ( onUpstreamFinish = { (ctx, input) ⇒ ctx.changeCompletionHandling(defaultCompletionHandling) readA }, onUpstreamFailure = { (ctx, _, cause) ⇒ ctx.fail(cause) SameState } ) override def initialState: State[_] = readB } } "Bypass string source with more element" in { val p = FlowGraph.closed(Sink.publisher[Int]) { implicit b => import FlowGraph.Implicits._ sink => val merge = b.add(new BypassMerge[Int, String]) Source(List(1,2)) ~> merge.in0 Source(List("1","2","3","4")) ~> merge.in1 merge.out ~> sink.inlet }.run() val s = TestSubscriber.manualProbe[Int] p.subscribe(s) val sub = s.expectSubscription() sub.request(10) s.expectNext(1) s.expectNext(2) s.expectComplete() } "Bypass string source with less elements" in { val p = FlowGraph.closed(Sink.publisher[Int]) { implicit b => import FlowGraph.Implicits._ sink => val merge = b.add(new BypassMerge[Int, String]) Source(List(1,2,3,4)) ~> merge.in0 Source(List("1","2")) ~> merge.in1 merge.out ~> sink.inlet }.run() val s = TestSubscriber.manualProbe[Int] p.subscribe(s) val sub = s.expectSubscription() sub.request(10) s.expectNext(1) s.expectNext(2) s.expectNext(3) s.expectNext(4) s.expectComplete() } -- >>>>>>>>>> Read the docs: http://akka.io/docs/ >>>>>>>>>> Check the FAQ: >>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html >>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user --- You received this message because you are subscribed to the Google Groups "Akka User List" group. To unsubscribe from this group and stop receiving emails from it, send an email to akka-user+unsubscr...@googlegroups.com. To post to this group, send email to akka-user@googlegroups.com. Visit this group at http://groups.google.com/group/akka-user. For more options, visit https://groups.google.com/d/optout.