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+str #19069 Add FlowOp.prepend for prepending Sources to Flows

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Iain Monro 2015-12-07 12:16:59 +00:00 • committed by Roland Kuhn
parent dcfa56e547
commit 52655f2836
10 changed files with 216 additions and 1 deletions
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37
akka-stream/src/main/scala/akka/stream/javadsl/Source.scala
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@ -446,6 +446,43 @@ final class Source[+Out, +Mat](delegate: scaladsl.Source[Out, Mat]) extends Grap
matF: function.Function2[Mat, M, M2]): javadsl.Source[T, M2] =
new Source(delegate.concatMat(that)(combinerToScala(matF)))
/**
* Prepend the given [[Source]] to this one, meaning that once the given source
* is exhausted and all result elements have been generated, the current source's
* elements will be produced.
*
* Note that the current [[Source]] is materialized together with this Flow and just kept
* from producing elements by asserting back-pressure until its time comes.
*
* If the given [[Source]] gets upstream error - no elements from this [[Source]] will be pulled.
*
* '''Emits when''' element is available from current source or from the given [[Source]] when current is completed
*
* '''Backpressures when''' downstream backpressures
*
* '''Completes when''' given [[Source]] completes
*
* '''Cancels when''' downstream cancels
*/
def prepend[T >: Out, M](that: Graph[SourceShape[T], M]): javadsl.Source[T, Mat] =
new Source(delegate.prepend(that))
/**
* Prepend the given [[Source]] to this one, meaning that once the given source
* is exhausted and all result elements have been generated, the current source's
* elements will be produced.
*
* Note that the current [[Source]] is materialized together with this Flow and just kept
* from producing elements by asserting back-pressure until its time comes.
*
* If the given [[Source]] gets upstream error - no elements from this [[Source]] will be pulled.
*
* @see [[#prepend]].
*/
def prependMat[T >: Out, M, M2](that: Graph[SourceShape[T], M],
matF: function.Function2[Mat, M, M2]): javadsl.Source[T, M2] =
new Source(delegate.prependMat(that)(combinerToScala(matF)))
/**
* Attaches the given [[Sink]] to this [[Flow]], meaning that elements that passes
* through will also be sent to the [[Sink]].