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+str #19782 Transpose a sources sequence (#19795)

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Rodolphe BELOUIN 2016-04-22 12:04:28 +02:00 • committed by Konrad Malawski
parent fd89f36940
commit 936c97051a
13 changed files with 731 additions and 23 deletions
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19
akka-stream/src/main/scala/akka/stream/javadsl/Source.scala
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@ -272,11 +272,26 @@ object Source {
*/
def combine[T, U](first: Source[T, _ <: Any], second: Source[T, _ <: Any], rest: java.util.List[Source[T, _ <: Any]],
strategy: function.Function[java.lang.Integer, _ <: Graph[UniformFanInShape[T, U], NotUsed]]): Source[U, NotUsed] = {
import scala.collection.JavaConverters._
val seq = if (rest != null) rest.asScala.map(_.asScala) else Seq()
val seq = if (rest != null) Util.immutableSeq(rest).map(_.asScala) else immutable.Seq()
new Source(scaladsl.Source.combine(first.asScala, second.asScala, seq: _*)(num ⇒ strategy.apply(num)))
}
/**
* Combine the elements of multiple streams into a stream of lists.
*/
def zipN[T](sources: java.util.List[Source[T, _ <: Any]]): Source[java.util.List[T], NotUsed] = {
val seq = if (sources != null) Util.immutableSeq(sources).map(_.asScala) else immutable.Seq()
new Source(scaladsl.Source.zipN(seq).map(_.asJava))
}
/*
* Combine the elements of multiple streams into a stream of lists using a combiner function.
*/
def zipWithN[T, O](zipper: function.Function[java.util.List[T], O], sources: java.util.List[Source[T, _ <: Any]]): Source[O, NotUsed] = {
val seq = if (sources != null) Util.immutableSeq(sources).map(_.asScala) else immutable.Seq()
new Source(scaladsl.Source.zipWithN[T, O](seq => zipper.apply(seq.asJava))(seq))
}
/**
* Creates a `Source` that is materialized as an [[akka.stream.SourceQueue]].
* You can push elements to the queue and they will be emitted to the stream if there is demand from downstream,