He-Pin commented on code in PR #983:
URL: https://github.com/apache/incubator-pekko/pull/983#discussion_r1460305695
##########
stream/src/main/scala/org/apache/pekko/stream/impl/fusing/Ops.scala:
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@@ -259,10 +259,16 @@ private[stream] object Collect {
override def onPush(): Unit =
try {
- pf.applyOrElse(grab(in), NotApplied) match {
- case NotApplied => pull(in)
- case result: Out @unchecked => push(out, result)
- case _ => throw new RuntimeException() //
won't happen, compiler exhaustiveness check pleaser
+ val result = pf.applyOrElse(grab(in), NotApplied)
+ //1. `applyOrElse` is faster than (`pf.isDefinedAt` and then
`pf.apply`)
+ //2. using reference comparing here instead of pattern matching can
generate less and quicker bytecode,
+ // eg: just a simple `IF_ACMPNE`, and you can find the same trick
in `CollectWhile` operator.
+ // If you interest, you can check the associated PR for this
change and the
+ // current implementation of
`scala.collection.IterableOnceOps.collectFirst`.
+ if (result.asInstanceOf[AnyRef] eq Collect.NotApplied) {
Review Comment:
@mdedetrich I have updated the text, how do you think about it? you can
change it directly, I may not be able to push next time:)
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