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Lazy source (#21081)

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Johan "Party Cannon" Andrén 2016-11-25 16:25:26 +01:00 • committed by Patrik Nordwall
parent 0d4858c627
commit 267f31149c
7 changed files with 218 additions and 1 deletions
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8
akka-stream/src/main/scala/akka/stream/scaladsl/Source.scala
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@ -355,6 +355,14 @@ object Source {
DefaultAttributes.failedSource,
shape("FailedSource")))
/**
* Creates a `Source` that is not materialized until there is downstream demand, when the source gets materialized
* the materialized future is completed with its value, if downstream cancels or fails without any demand the
* create factory is never called and the materialized `Future` is failed.
*/
def lazily[T, M](create: () => Source[T, M]): Source[T, Future[M]] =
Source.fromGraph(new LazySource[T, M](create))
/**
* Creates a `Source` that is materialized as a [[org.reactivestreams.Subscriber]]
*/