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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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21
akka-stream/src/main/scala/akka/stream/javadsl/SubSource.scala
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@ -712,6 +712,27 @@ class SubSource[+Out, +Mat](delegate: scaladsl.SubFlow[Out, Mat, scaladsl.Source
def concat[T >: Out, M](that: Graph[SourceShape[T], M]): SubSource[T, Mat] =
new SubSource(delegate.concat(that))
/**
* Prepend the given [[Source]] to this [[Flow]], meaning that before elements
* are generated from this Flow, the Source's elements will be produced until it
* is exhausted, at which point Flow elements will start being produced.
*
* Note that this Flow will be materialized together with the [[Source]] 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 [[Flow]] will be pulled.
*
* '''Emits when''' element is available from the given [[Source]] or from current stream when the [[Source]] is completed
*
* '''Backpressures when''' downstream backpressures
*
* '''Completes when''' this [[Flow]] completes
*
* '''Cancels when''' downstream cancels
*/
def prepend[T >: Out, M](that: Graph[SourceShape[T], M]): SubSource[T, Mat] =
new SubSource(delegate.prepend(that))
/**
* Attaches the given [[Sink]] to this [[Flow]], meaning that elements that passes
* through will also be sent to the [[Sink]].