raboof/pekko
1
0
Fork 0
Code Issues Pull requests Projects Releases 6 Packages Wiki Activity Actions 11

+str #18906 add Sink.headOption

Browse source
This commit is contained in:
Konrad Malawski 2015-11-10 15:15:59 +01:00
parent 985e3b1c2f
commit 8650d0c473
8 changed files with 92 additions and 33 deletions
Download patch file Download diff file Expand all files Collapse all files

16
akka-stream/src/main/scala/akka/stream/javadsl/Sink.scala
View file

@ -4,6 +4,7 @@
package akka.stream.javadsl
import akka.actor.{ ActorRef, Props }
import akka.dispatch.ExecutionContexts
import akka.japi.function
import akka.stream.impl.StreamLayout
import akka.stream.{ javadsl, scaladsl, _ }
@ -90,10 +91,25 @@ object Sink {
/**
* A `Sink` that materializes into a `Future` of the first 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 [[headOption]].
*/
def head[In](): Sink[In, Future[In]] =
new Sink(scaladsl.Sink.head[In])
/**
* A `Sink` that materializes into a `Future` of the optional first 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 headOption[In](): Sink[In, Future[akka.japi.Option[In]]] =
new Sink(scaladsl.Sink.headOption[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.