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name := "stream-problem" | |
scalaVersion := "2.11.4" | |
libraryDependencies ++= Seq( | |
"com.typesafe.akka" %% "akka-stream-experimental" % "1.0-M2" | |
) |
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package main | |
import akka.actor.{Actor,ActorSystem, Props} | |
import akka.stream.scaladsl.Source | |
import akka.stream.FlowMaterializer | |
import scala.concurrent.Future | |
import scala.util.{Try,Success,Failure} | |
// import scala.Predef.identity | |
object Counter { | |
case class Increment(key: String) | |
case object Display | |
} | |
class Counter extends Actor { | |
import Counter._ | |
var counts = Map.empty[String, Int] | |
def receive = { | |
case Increment(key) => | |
counts = counts.updated(key, counts.getOrElse(key, 0) + 1) | |
case Display => | |
println(s"Capture values: ${counts}") | |
println(s"Total received messages: ${counts.values.sum}") | |
} | |
} | |
object Main extends App { | |
implicit val system = ActorSystem("job") | |
val counter = system.actorOf(Props(new Counter)) | |
import system.dispatcher | |
implicit val materializer = FlowMaterializer() | |
val source = Source(1 to 500) | |
source. | |
map { i => println(i); i }. | |
groupBy { i => (i % 10) == 0 }. | |
map { | |
case (true, flow) => | |
flow. | |
map { l => Thread.sleep(25); l }. | |
foreach { l => counter ! Counter.Increment("10%") } | |
case (false, flow) => | |
flow. | |
map { l => Thread.sleep(25); l }. | |
foreach { l => counter ! Counter.Increment("90%") } | |
}. | |
fold(Future.successful[Unit]{}){ (reduced, f) => reduced.flatMap { _ => f } }. | |
flatMap(identity). | |
onComplete { v=> | |
println(v) | |
counter ! Counter.Display | |
system.shutdown | |
} | |
} |
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Captured values: Map(90% -> 445, 10% -> 49) | |
Total received messages: 494 |
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