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Merge pull request #18951 from akka/wip-add-sink-last-√

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+str - Adds Sink.last and Sink.lastOption to mirror Sink.head and Sin…
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Viktor Klang (√) 2015-11-18 22:27:50 +01:00
commit fa683e1842
12 changed files with 267 additions and 190 deletions
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21
akka-stream/src/main/scala/akka/stream/javadsl/Sink.scala
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@ -113,6 +113,27 @@ object Sink {
new Sink(scaladsl.Sink.headOption[In].mapMaterializedValue(
_.map(akka.japi.Option.fromScalaOption)(ExecutionContexts.sameThreadExecutionContext)))
/**
* A `Sink` that materializes into a `Future` of the last value received.
* If the stream completes before signaling at least a single element, the Future will be failed with a [[NoSuchElementException]].
* If the stream signals an error errors before signaling at least a single element, the Future will be failed with the streams exception.
*
* See also [[lastOption]].
*/
def last[In](): Sink[In, Future[In]] =
new Sink(scaladsl.Sink.last[In])
/**
* A `Sink` that materializes into a `Future` of the optional last value received.
* If the stream completes before signaling at least a single element, the value of the Future will be an empty [[akka.japi.Option]].
* If the stream signals an error errors before signaling at least a single element, the Future will be failed with the streams exception.
*
* See also [[head]].
*/
def lastOption[In](): Sink[In, Future[akka.japi.Option[In]]] =
new Sink(scaladsl.Sink.lastOption[In].mapMaterializedValue(
_.map(akka.japi.Option.fromScalaOption)(ExecutionContexts.sameThreadExecutionContext)))
/**
* Sends the elements of the stream to the given `ActorRef`.
* If the target actor terminates the stream will be canceled.