He-Pin commented on code in PR #628:
URL: https://github.com/apache/incubator-pekko/pull/628#discussion_r1315152410
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stream/src/main/scala/org/apache/pekko/stream/scaladsl/Flow.scala:
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@@ -1141,7 +1140,18 @@ trait FlowOps[+Out, +Mat] {
*
* @see [[#mapAsync]]
*/
- def mapAsyncUnordered[T](parallelism: Int)(f: Out => Future[T]): Repr[T] =
via(MapAsyncUnordered(parallelism, f))
+ def mapAsyncUnordered[T](parallelism: Int)(f: Out => Future[T]): Repr[T] =
+ unsafeTransformUnordered[T](parallelism) { (out, emitter) =>
+ val future = f(out)
+ future.value match {
+ case Some(elem) =>
emitter.asInstanceOf[UnsafeEmitter[T]].handleNow(elem)
+ case None =>
future.onComplete(emitter.handle)(pekko.dispatch.ExecutionContexts.parasitic)
+ }
+ }
Review Comment:
This change is a **demo** of how this method can be used.
using `Emitter[T]` as context make code simpler in Scala but more forwarding.
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