pjfanning commented on code in PR #1775:
URL: https://github.com/apache/pekko/pull/1775#discussion_r1966510728
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stream/src/main/scala/org/apache/pekko/stream/impl/fusing/Ops.scala:
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@@ -2171,14 +2177,29 @@ private[pekko] object TakeWithin {
if (maximumRetries < 0 || attempt < maximumRetries) {
pf.applyOrElse(ex, NotApplied) match {
case _: NotApplied.type => failStage(ex)
- case source: Graph[SourceShape[T] @unchecked, M @unchecked] if
TraversalBuilder.isEmptySource(source) =>
- completeStage()
- case other: Graph[SourceShape[T] @unchecked, M @unchecked] =>
- TraversalBuilder.getSingleSource(other) match {
- case OptionVal.Some(singleSource) =>
- emit(out, singleSource.elem.asInstanceOf[T], () =>
completeStage())
+ case source: Graph[SourceShape[T] @unchecked, M @unchecked] =>
+ TraversalBuilder.getValuePresentedSource(source) match {
+ case OptionVal.Some(graph) => graph match {
+ case singleSource: SingleSource[T @unchecked] => emit(out,
singleSource.elem, () => completeStage())
+ case failed: FailedSource[T @unchecked] =>
failStage(failed.failure)
+ case futureSource: FutureSource[T @unchecked] =>
futureSource.future.value match {
+ case Some(Success(elem)) => emit(out, elem, () =>
completeStage())
+ case Some(Failure(ex)) => failStage(ex)
+ case None =>
+ switchTo(source)
+ attempt += 1
+ }
+ case iterableSource: IterableSource[T @unchecked] =>
+ emitMultiple(out, iterableSource.elements, () =>
completeStage())
+ case javaStreamSource: JavaStreamSource[T @unchecked, _] =>
+ emitMultiple(out, javaStreamSource.open().iterator(), ()
=> completeStage())
+ case maybeEmpty if
TraversalBuilder.isEmptySource(maybeEmpty) => completeStage()
Review Comment:
Is this going to be slower than the old code? Old code called
`TraversalBuilder.isEmptySource(source)` before calling
`TraversalBuilder.getSingleSource`. The new code calls
`TraversalBuilder.getValuePresentedSource` before checking
`TraversalBuilder.isEmptySource(source)` .
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