He-Pin commented on code in PR #1787:
URL: https://github.com/apache/pekko/pull/1787#discussion_r1984619549
##########
stream/src/main/scala/org/apache/pekko/stream/scaladsl/Flow.scala:
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@@ -2804,6 +2804,25 @@ trait FlowOps[+Out, +Mat] {
def flattenMerge[T, M](breadth: Int)(implicit ev: Out <:<
Graph[SourceShape[T], M]): Repr[T] =
flatMapMerge(breadth, ev)
+ /**
+ * Transforms each input element into a `Source` of output elements that is
+ * then flattened into the output stream until a new input element is
received
+ * at which point the current (now previous) substream is cancelled (which
is why
+ * this operator is sometimes also called "flatMapLatest").
+ *
+ * '''Emits when''' the current substream has an element available
+ *
+ * '''Backpressures when''' never
+ *
+ * '''Completes when''' upstream completes and the current substream
completes
+ *
+ * '''Cancels when''' downstream cancels
+ *
+ * @since 1.2.0
+ */
+ def switchMap[T, M](f: Out => Graph[SourceShape[T], M]): Repr[T] =
+ map(f).via(new Switch[T,
M].addAttributes(Attributes(SourceLocation.forLambda(f))))
Review Comment:
You implemented it with a `map` and `switch` cool.
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