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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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19
akka-stream/src/main/scala/akka/stream/javadsl/SubSource.scala
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@ -404,6 +404,25 @@ class SubSource[+Out, +Mat](delegate: scaladsl.SubFlow[Out, Mat, scaladsl.Source
def fold[T](zero: T)(f: function.Function2[T, Out, T]): SubSource[T, Mat] =
new SubSource(delegate.fold(zero)(f.apply))
/**
* Similar to `fold` but with an asynchronous function.
* Applies the given function towards its current and next value,
* yielding the next current value.
*
* If the function `f` returns a failure and the supervision decision is
* [[akka.stream.Supervision.Restart]] current value starts at `zero` again
* the stream will continue.
*
* '''Emits when''' upstream completes
*
* '''Backpressures when''' downstream backpressures
*
* '''Completes when''' upstream completes
*
* '''Cancels when''' downstream cancels
*/
def foldAsync[T](zero: T)(f: function.Function2[T, Out, CompletionStage[T]]): SubSource[T, Mat] = new SubSource(delegate.foldAsync(zero) { (out, in) ⇒ f(out, in).toScala })
/**
* Similar to `fold` but uses first element as zero element.
* Applies the given function towards its current and next value,