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+str #18556 add delay combinator

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This commit is contained in:
Alexander Golubev 2015-11-25 21:29:35 -05:00
parent 270ef41359
commit 83d3143236
10 changed files with 277 additions and 60 deletions
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26
akka-stream/src/main/scala/akka/stream/javadsl/Source.scala
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@ -710,18 +710,30 @@ final class Source[+Out, +Mat](delegate: scaladsl.Source[Out, Mat]) extends Grap
new Source(delegate.groupedWithin(n, d).map(_.asJava)) // TODO optimize to one step
/**
* Shifts emissions in time by a specified amount
* Shifts elements emission in time by a specified amount. It allows to store elements
* in internal buffer while waiting for next element to be emitted. Depending on the defined
* [[akka.stream.DelayOverflowStrategy]] it might drop elements or backpressure the upstream if
* there is no space available in the buffer.
*
* '''Emits when''' upstream emitted and configured time elapsed
* Internal buffer has default capacity 16. You can set buffer size by calling `withAttributes(inputBuffer)`
*
* '''Backpressures when''' downstream backpressures
* '''Emits when''' there is a pending element in the buffer and configured time for this element elapsed
* * EmitEarly - strategy do not wait to emit element if buffer is full
*
* '''Completes when''' upstream completes
* '''Backpressures when''' depending on OverflowStrategy
* * Backpressure - backpressures when buffer is full
* * DropHead, DropTail, DropBuffer - never backpressures
* * Fail - fails the stream if buffer gets full
*
* '''Cancels when''' downstream completes
* '''Completes when''' upstream completes and buffered elements has been drained
*
* '''Cancels when''' downstream cancels
*
* @param of time to shift all messages
* @param strategy Strategy that is used when incoming elements cannot fit inside the buffer
*/
def delay(of: FiniteDuration): javadsl.Source[Out, Mat] =
new Source(delegate.delay(of))
def delay(of: FiniteDuration, strategy: DelayOverflowStrategy): javadsl.Source[Out, Mat] =
new Source(delegate.delay(of, strategy))
/**
* Discard the given number of elements at the beginning of the stream.