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FoldAsync op for Flow #18603

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Cédric Chantepie 2016-08-24 21:02:32 +02:00 • committed by Johan Andrén
parent 9630feb6cc
commit efc87af58a
16 changed files with 519 additions and 620 deletions
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9
akka-stream/src/main/scala/akka/stream/javadsl/Sink.scala
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@ -29,6 +29,15 @@ object Sink {
def fold[U, In](zero: U, f: function.Function2[U, In, U]): javadsl.Sink[In, CompletionStage[U]] =
new Sink(scaladsl.Sink.fold[U, In](zero)(f.apply).toCompletionStage())
/**
* A `Sink` that will invoke the given asynchronous function for every received element, giving it its previous
* output (or the given `zero` value) and the element as input.
* The returned [[java.util.concurrent.CompletionStage]] will be completed with value of the final
* function evaluation when the input stream ends, or completed with `Failure`
* if there is a failure is signaled in the stream.
*/
def foldAsync[U, In](zero: U, f: function.Function2[U, In, CompletionStage[U]]): javadsl.Sink[In, CompletionStage[U]] = new Sink(scaladsl.Sink.foldAsync[U, In](zero)(f(_, _).toScala).toCompletionStage())
/**
* A `Sink` that will invoke the given function for every received element, giving it its previous
* output (from the second element) and the element as input.