merge

Merge multiple sources.

Fan-in operators

Signature

Source.mergeSource.merge Flow.mergeFlow.merge

Description

Merge multiple sources. Picks elements randomly if all sources has elements ready.

Example

Scala

copysourceimport akka.stream.scaladsl.{ Sink, Source }

val sourceA = Source(List(1, 2, 3, 4))
val sourceB = Source(List(10, 20, 30, 40))

sourceA.merge(sourceB).runWith(Sink.foreach(println))
// merging is not deterministic, can for example print 1, 2, 3, 4, 10, 20, 30, 40

Java

copysourceimport akka.stream.javadsl.Keep;
import akka.stream.javadsl.Source;
import akka.stream.javadsl.Sink;

import java.util.*;

Source<Integer, NotUsed> sourceA = Source.from(Arrays.asList(1, 2, 3, 4));
Source<Integer, NotUsed> sourceB = Source.from(Arrays.asList(10, 20, 30, 40));
sourceA.merge(sourceB).runForeach(System.out::println, system);
// merging is not deterministic, can for example print 1, 2, 3, 4, 10, 20, 30, 40

Reactive Streams semantics