36 lines
1.2 KiB
Java
36 lines
1.2 KiB
Java
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/**
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* Copyright (C) 2018 Lightbend Inc. <https://www.lightbend.com>
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*/
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package jdocs.stream.operators;
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import akka.NotUsed;
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import akka.actor.ActorSystem;
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import akka.stream.ActorMaterializer;
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import akka.stream.Materializer;
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import akka.stream.javadsl.Sink;
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import akka.stream.javadsl.Source;
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import java.util.Arrays;
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import java.util.concurrent.CompletionStage;
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import java.util.concurrent.ExecutionException;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.TimeoutException;
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public class SinkDocExamples {
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static void reduceExample() throws InterruptedException, ExecutionException, TimeoutException {
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final ActorSystem system = ActorSystem.create("SourceFromExample");
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final Materializer materializer = ActorMaterializer.create(system);
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//#reduce-operator-example
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Source<Integer, NotUsed> ints = Source.from(Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10));
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CompletionStage<Integer> sum = ints.runWith(Sink.reduce((a, b) -> a + b), materializer);
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int result = sum.toCompletableFuture().get(3, TimeUnit.SECONDS);
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System.out.println(result);
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// 55
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//#reduce-operator-example
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}
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}
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