He-Pin commented on code in PR #989:
URL: https://github.com/apache/incubator-pekko/pull/989#discussion_r1460746593
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stream/src/main/scala/org/apache/pekko/stream/scaladsl/Sink.scala:
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@@ -435,6 +436,24 @@ object Sink {
def foldAsync[U, T](zero: U)(f: (U, T) => Future[U]): Sink[T, Future[U]] =
Flow[T].foldAsync(zero)(f).toMat(Sink.head)(Keep.right).named("foldAsyncSink")
+ /**
+ * A `Sink` that will invoke the given function for every received element,
giving it its previous
+ * output (or the given `false`) and the element as input.
+ * * The returned [[scala.concurrent.Future]] will be completed with value
of the final
+ * function evaluation when the input stream ends, or completed with
`Failure`
+ * if there is a failure signaled in the stream.
+ */
+ def forall[T](predicate: T => Boolean): Sink[T, Future[Boolean]] = {
+ var acc = true
+ Flow[T].collectWhile {
+ case element if acc && predicate(element) => true
+ case _ if acc => acc = false; false
Review Comment:
As the graph can be materialize multi time , this can cause a problem. when
you run this graph several times.
Maybe you can try with `statefulMap`.
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