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()
}
--
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>>>>>>>>>> Check the FAQ:
>>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html
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