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Merge pull request #25538 from jchapuis/zipLatest

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zipLatest and zipLatestWith operators (refs #25392)
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Johan Andrén 2018-10-03 11:28:43 +02:00 • committed by GitHub
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17 changed files with 1180 additions and 1 deletions
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33
akka-stream/src/main/scala/akka/stream/javadsl/SubSource.scala
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@ -1478,6 +1478,21 @@ class SubSource[Out, Mat](delegate: scaladsl.SubFlow[Out, Mat, scaladsl.Source[O
def zip[T](source: Graph[SourceShape[T], _]): SubSource[akka.japi.Pair[Out @uncheckedVariance, T], Mat] =
new SubSource(delegate.zip(source).map { case (o, t) ⇒ akka.japi.Pair.create(o, t) })
/**
* Combine the elements of current [[Flow]] and the given [[Source]] into a stream of tuples, picking always the latest element of each.
*
* '''Emits when''' all of the inputs have at least an element available, and then each time an element becomes
* available on either of the inputs
*
* '''Backpressures when''' downstream backpressures
*
* '''Completes when''' any upstream completes
*
* '''Cancels when''' downstream cancels
*/
def zipLatest[T](source: Graph[SourceShape[T], _]): SubSource[akka.japi.Pair[Out @uncheckedVariance, T], Mat] =
new SubSource(delegate.zipLatest(source).map { case (o, t) ⇒ akka.japi.Pair.create(o, t) })
/**
* Put together the elements of current [[Flow]] and the given [[Source]]
* into a stream of combined elements using a combiner function.
@ -1495,6 +1510,24 @@ class SubSource[Out, Mat](delegate: scaladsl.SubFlow[Out, Mat, scaladsl.Source[O
combine: function.Function2[Out, Out2, Out3]): SubSource[Out3, Mat] =
new SubSource(delegate.zipWith[Out2, Out3](that)(combinerToScala(combine)))
/**
* Put together the elements of current [[Flow]] and the given [[Source]]
* into a stream of combined elements using a combiner function, picking always the latest element of each.
*
* '''Emits when''' all of the inputs have at least an element available, and then each time an element becomes
* available on either of the inputs
*
* '''Backpressures when''' downstream backpressures
*
* '''Completes when''' any upstream completes
*
* '''Cancels when''' downstream cancels
*/
def zipLatestWith[Out2, Out3](
that: Graph[SourceShape[Out2], _],
combine: function.Function2[Out, Out2, Out3]): SubSource[Out3, Mat] =
new SubSource(delegate.zipLatestWith[Out2, Out3](that)(combinerToScala(combine)))
/**
* Combine the elements of current [[Source]] into a stream of tuples consisting
* of all elements paired with their index. Indices start at 0.