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doc: Broadcast Stream operator, #25468 (#28091)

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* doc: Broadcast Stream operator, #25468

* example intro text
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Patrik Nordwall 2019-11-20 13:03:03 +01:00 • committed by Arnout Engelen
parent 35dbfd7883
commit 6185fbde18
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akka-docs/src/test/scala/docs/stream/operators/BroadcastDocExample.scala Normal file
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/*
* Copyright (C) 2019 Lightbend Inc. <https://www.lightbend.com>
*/
package docs.stream.operators
import java.util.concurrent.ThreadLocalRandom
import scala.concurrent.Future
import akka.actor.ActorSystem
import akka.stream.scaladsl.Broadcast
import akka.stream.scaladsl.Keep
object BroadcastDocExample {
implicit val system: ActorSystem = ???
//#broadcast
import akka.NotUsed
import akka.stream.ClosedShape
import akka.stream.scaladsl.Flow
import akka.stream.scaladsl.GraphDSL
import akka.stream.scaladsl.RunnableGraph
import akka.stream.scaladsl.Sink
import akka.stream.scaladsl.Source
val source: Source[Int, NotUsed] =
Source.fromIterator(() => Iterator.continually(ThreadLocalRandom.current().nextInt(100))).take(100)
val countSink: Sink[Int, Future[Int]] = Flow[Int].toMat(Sink.fold(0)((acc, elem) => acc + 1))(Keep.right)
val minSink: Sink[Int, Future[Int]] = Flow[Int].toMat(Sink.fold(0)((acc, elem) => math.min(acc, elem)))(Keep.right)
val maxSink: Sink[Int, Future[Int]] = Flow[Int].toMat(Sink.fold(0)((acc, elem) => math.max(acc, elem)))(Keep.right)
val (count: Future[Int], min: Future[Int], max: Future[Int]) =
RunnableGraph
.fromGraph(GraphDSL.create(countSink, minSink, maxSink)(Tuple3.apply) {
implicit builder => (countS, minS, maxS) =>
import GraphDSL.Implicits._
val broadcast = builder.add(Broadcast[Int](3))
source ~> broadcast
broadcast.out(0) ~> countS
broadcast.out(0) ~> minS
broadcast.out(0) ~> maxS
ClosedShape
})
.run()
//#broadcast
//#broadcast-async
RunnableGraph.fromGraph(GraphDSL.create(countSink, minSink, maxSink)(Tuple3.apply) {
implicit builder => (countS, minS, maxS) =>
import GraphDSL.Implicits._
val broadcast = builder.add(Broadcast[Int](3))
source ~> broadcast
broadcast.out(0) ~> Flow[Int].async ~> countS
broadcast.out(0) ~> Flow[Int].async ~> minS
broadcast.out(0) ~> Flow[Int].async ~> maxS
ClosedShape
})
//#broadcast-async
}