fromFuture

Send the single value of the Future when it completes and there is demand.

Source operators

Signature

def future[T](futureElement: Future[T]): Source[T, NotUsed]

Description

Send the single value of the Future when it completes and there is demand. If the future fails the stream is failed with that exception.

For the corresponding operator for the Java standard library CompletionStage see completionStage.

Reactive Streams semantics

emits the future completes

completes after the future has completed

Example

Scala

import akka.actor.ActorSystem import akka.stream.scaladsl._ import akka.{ Done, NotUsed } import scala.concurrent.Future val source: Source[Int, NotUsed] = Source.future(Future.successful(10)) val sink: Sink[Int, Future[Done]] = Sink.foreach((i: Int) => println(i)) val done: Future[Done] = source.runWith(sink) //10
Found an error in this documentation? The source code for this page can be found here. Please feel free to edit and contribute a pull request.