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Add wireTap combinator (#15077) (#23824)

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Catalin Ursachi 2018-02-13 19:39:00 +00:00 • committed by Konrad `ktoso` Malawski
parent f2e39c7534
commit ccf5d46a58
12 changed files with 321 additions and 7 deletions
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17
akka-stream/src/main/scala/akka/stream/javadsl/SubSource.scala Normal file → Executable file
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@ -1157,6 +1157,23 @@ class SubSource[+Out, +Mat](delegate: scaladsl.SubFlow[Out, Mat, scaladsl.Source
def divertTo(that: Graph[SinkShape[Out], _], when: function.Predicate[Out]): SubSource[Out, Mat] =
new SubSource(delegate.divertTo(that, when.test))
/**
* Attaches the given [[Sink]] to this [[Flow]] as a wire tap, meaning that elements that pass
* through will also be sent to the wire-tap Sink, without the latter affecting the mainline flow.
* If the wire-tap Sink backpressures, elements that would've been sent to it will be dropped instead.
*
* '''Emits when''' element is available and demand exists from the downstream; the element will
* also be sent to the wire-tap Sink if there is demand.
*
* '''Backpressures when''' downstream backpressures
*
* '''Completes when''' upstream completes
*
* '''Cancels when''' downstream cancels
*/
def wireTap(that: Graph[SinkShape[Out], _]): SubSource[Out, Mat] =
new SubSource(delegate.wireTap(that))
/**
* Merge the given [[Source]] to this [[Flow]], taking elements as they arrive from input streams,
* picking randomly when several elements ready.