interleave

Emits a specifiable number of elements from the original source, then from the provided source and repeats.

Fan-in operators

Signature

Source.interleaveSource.interleave Flow.interleaveFlow.interleave

Description

Emits a specifiable number of elements from the original source, then from the provided source and repeats. If one source completes the rest of the other stream will be emitted.

Example

Scala

copysourceimport org.apache.pekko
import pekko.stream.scaladsl.Sink
import pekko.stream.scaladsl.Source

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

sourceA.interleave(sourceB, segmentSize = 2).runWith(Sink.foreach(println))
// prints 1, 2, 10, 20, 3, 4, 30, 40

Java

copysourceimport org.apache.pekko.stream.javadsl.Keep;
import org.apache.pekko.stream.javadsl.Source;
import org.apache.pekko.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.interleave(sourceB, 2).runForeach(System.out::println, system);
// prints 1, 2, 10, 20, 3, 4, 30, 40

Reactive Streams semantics