Hi all,
I have some simple application based on akka streams and http:
My Flow items:
val resultSink = Sink.head[String]
val fl0 = Flow[String].map(_.toInt)
val fl2 = Flow[Int].map{
case value =>
Thread.sleep(10000)
value.toString
}
val fl3 = Flow[String].mapAsync(1)(callMe)
Part of my akka-http route:
val route = get {
path("test") {
path("register") {
parameter('username) { case username: Username =>
Source.single(username).via(fl0).via(fl2).via(fl3).runWith(resultSink):
Future[String]
}
}
}
I want to use one flow : Source.single(username).
via(fl0).via(fl2).via(fl3).runWith(resultSink) for processing all requests.
I want this for use streams back-pressure. But I can't figure out how
create Source that can accept values like call def proccess(username:
String): Future[String] but with back-pressure, because, for example, a
want long-call DB in fl2 step, and DB can't accept more than 1 request per
time (only for example)
With best regards, Vladimir.
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