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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/java/jdocs/stream/operators/BroadcastDocExample.java Normal file
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/*
* Copyright (C) 2019 Lightbend Inc. <https://www.lightbend.com>
*/
package jdocs.stream.operators;
import akka.actor.ActorSystem;
// #import
import akka.NotUsed;
import akka.japi.tuple.Tuple3;
import akka.stream.ClosedShape;
import akka.stream.UniformFanOutShape;
import akka.stream.javadsl.Broadcast;
import akka.stream.javadsl.Flow;
import akka.stream.javadsl.GraphDSL;
import akka.stream.javadsl.Keep;
import akka.stream.javadsl.RunnableGraph;
import akka.stream.javadsl.Sink;
import akka.stream.javadsl.Source;
import java.util.concurrent.CompletionStage;
// #import
public class BroadcastDocExample {
private final ActorSystem system = ActorSystem.create("PartitionDocExample");
void partitionExample() {
// #broadcast
Source<Integer, NotUsed> source = Source.range(1, 10);
Sink<Integer, CompletionStage<Integer>> countSink =
Flow.of(Integer.class).toMat(Sink.fold(0, (acc, elem) -> acc + 1), Keep.right());
Sink<Integer, CompletionStage<Integer>> minSink =
Flow.of(Integer.class).toMat(Sink.fold(0, Math::min), Keep.right());
Sink<Integer, CompletionStage<Integer>> maxSink =
Flow.of(Integer.class).toMat(Sink.fold(0, Math::max), Keep.right());
final Tuple3<CompletionStage<Integer>, CompletionStage<Integer>, CompletionStage<Integer>>
result =
RunnableGraph.fromGraph(
GraphDSL.create3(
countSink,
minSink,
maxSink,
Tuple3::create,
(builder, countS, minS, maxS) -> {
final UniformFanOutShape<Integer, Integer> broadcast =
builder.add(Broadcast.create(3));
builder.from(builder.add(source)).viaFanOut(broadcast);
builder.from(broadcast.out(0)).to(countS);
builder.from(broadcast.out(1)).to(minS);
builder.from(broadcast.out(2)).to(maxS);
return ClosedShape.getInstance();
}))
.run(system);
// #broadcast
// #broadcast-async
RunnableGraph.fromGraph(
GraphDSL.create3(
countSink,
minSink,
maxSink,
Tuple3::create,
(builder, countS, minS, maxS) -> {
final UniformFanOutShape<Integer, Integer> broadcast =
builder.add(Broadcast.create(3));
builder.from(builder.add(source)).viaFanOut(broadcast);
builder
.from(broadcast.out(0))
.via(builder.add(Flow.of(Integer.class).async()))
.to(countS);
builder
.from(broadcast.out(1))
.via(builder.add(Flow.of(Integer.class).async()))
.to(minS);
builder
.from(broadcast.out(2))
.via(builder.add(Flow.of(Integer.class).async()))
.to(maxS);
return ClosedShape.getInstance();
}));
// #broadcast-async
}
}