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+str #22711 adding GroupedWeightedWithin

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Gilad Hoch 2017-04-28 16:07:06 +03:00 • committed by Johan Andrén
parent 87b28d0dc5
commit edee4ba409
11 changed files with 332 additions and 48 deletions
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25
akka-stream/src/main/scala/akka/stream/javadsl/SubSource.scala
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@ -536,9 +536,9 @@ class SubSource[+Out, +Mat](delegate: scaladsl.SubFlow[Out, Mat, scaladsl.Source
* The last group before end-of-stream will contain the buffered elements
* since the previously emitted group.
*
* '''Emits when''' the configured time elapses since the last group has been emitted
* '''Emits when''' the configured time elapses since the last group has been emitted or `n` elements is buffered
*
* '''Backpressures when''' the configured time elapses since the last group has been emitted
* '''Backpressures when''' downstream backpressures, and there are `n+1` buffered elements
*
* '''Completes when''' upstream completes (emits last group)
*
@ -550,6 +550,27 @@ class SubSource[+Out, +Mat](delegate: scaladsl.SubFlow[Out, Mat, scaladsl.Source
def groupedWithin(n: Int, d: FiniteDuration): SubSource[java.util.List[Out @uncheckedVariance], Mat] =
new SubSource(delegate.groupedWithin(n, d).map(_.asJava)) // TODO optimize to one step
/**
* Chunk up this stream into groups of elements received within a time window,
* or limited by the weight of the elements, whatever happens first.
* Empty groups will not be emitted if no elements are received from upstream.
* The last group before end-of-stream will contain the buffered elements
* since the previously emitted group.
*
* '''Emits when''' the configured time elapses since the last group has been emitted or weight limit reached
*
* '''Backpressures when''' downstream backpressures, and buffered group (+ pending element) weighs more than `maxWeight`
*
* '''Completes when''' upstream completes (emits last group)
*
* '''Cancels when''' downstream completes
*
* `maxWeight` must be positive, and `d` must be greater than 0 seconds, otherwise
* IllegalArgumentException is thrown.
*/
def groupedWeightedWithin(maxWeight: Long, costFn: function.Function[Out, Long], d: FiniteDuration): javadsl.SubSource[java.util.List[Out @uncheckedVariance], Mat] =
new SubSource(delegate.groupedWeightedWithin(maxWeight, d)(costFn.apply).map(_.asJava))
/**
* Discard the given number of elements at the beginning of the stream.
* No elements will be dropped if `n` is zero or negative.