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19452: Contramap and fromFunction

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This commit is contained in:
Alois Cochard 2016-02-10 12:18:24 +01:00 • committed by Endre Sándor Varga
parent d9b47c3a8d
commit 6c69fba61e
8 changed files with 71 additions and 3 deletions
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11
akka-stream/src/main/scala/akka/stream/javadsl/Sink.scala
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@ -265,6 +265,17 @@ final class Sink[-In, +Mat](delegate: scaladsl.Sink[In, Mat]) extends Graph[Sink
def runWith[M](source: Graph[SourceShape[In], M], materializer: Materializer): M =
asScala.runWith(source)(materializer)
/**
* Transform this Sink by applying a function to each *incoming* upstream element before
* it is passed to the [[Sink]]
*
* '''Backpressures when''' original [[Sink]] backpressures
*
* '''Cancels when''' original [[Sink]] backpressures
*/
def contramap[In2](f: function.Function[In2, In]): Sink[In2, Mat] =
javadsl.Flow.fromFunction(f).toMat(this, Keep.right[NotUsed, Mat])
/**
* Transform only the materialized value of this Sink, leaving all other properties as they were.
*/