I came up a much simplified program to test, and I still get nothing:
val source: Source[Int, Unit] = Source(1 to 10)
val printSink = Sink.foreach[Int](e => println(e))
val actionStream: ArrayBuffer[(Int) => Int] = ArrayBuffer.empty[(Int) => Int]
def add(a: Int) = a + 1
def exec(): Unit = {
val sourceReady = actionStream.drop(1).foldLeft(source)
{(source, action) =>
source.via(Flow[Int].mapAsync(e => Future(action.apply(e))))
}
sourceReady
sourceReady.runWith(printSink)
}
"parallel test" should "work" in {
actionStream += ((a: Int) => add(a))
actionStream += ((a: Int) => add(a))
exec()
}
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