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example for reduce operator #25468

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mohammad mehdi 2018-10-08 17:45:33 +03:30 • committed by Johan Andrén
parent ef08bbd74b
commit 918cb72594
3 changed files with 54 additions and 0 deletions
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akka-docs/src/test/java/jdocs/stream/operators/SinkDocExamples.java Normal file
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/**
* Copyright (C) 2018 Lightbend Inc. <https://www.lightbend.com>
*/
package jdocs.stream.operators;
import akka.NotUsed;
import akka.actor.ActorSystem;
import akka.stream.ActorMaterializer;
import akka.stream.Materializer;
import akka.stream.javadsl.Sink;
import akka.stream.javadsl.Source;
import java.util.Arrays;
import java.util.concurrent.CompletionStage;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
public class SinkDocExamples {
static void reduceExample() throws InterruptedException, ExecutionException, TimeoutException {
final ActorSystem system = ActorSystem.create("SourceFromExample");
final Materializer materializer = ActorMaterializer.create(system);
//#reduce-operator-example
Source<Integer, NotUsed> ints = Source.from(Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10));
CompletionStage<Integer> sum = ints.runWith(Sink.reduce((a, b) -> a + b), materializer);
int result = sum.toCompletableFuture().get(3, TimeUnit.SECONDS);
System.out.println(result);
// 55
//#reduce-operator-example
}
}