I asked this on SO without any responses. Thought I'd x-post here. I'm
wondering if there's any sane way to make this graph fail, or if I'm just
thinking about this in the entirely wrong way:
def flow(n: String) = Flow[Int].map{v => println(s"$n: $v"); v + 1}
val g = Source.fromGraph(GraphDSL.create() { implicit b =>
import GraphDSL.Implicits._
val broadcast = b.add(Broadcast[Int](2))
val source = b.add(Source.single(1))
source ~> flow("A") ~> broadcast
broadcast.out(1) ~> flow("B") ~> flow("C").mapAsync(1){ _ =>
Future.failed(new Exception())} ~> Sink.foreach[Int](f => println("OK"))
SourceShape(broadcast.out(0))})
http://stackoverflow.com/questions/35420779/failing-an-akka-stream-graph-if-a-downstream-branch-fails
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