RFR: JDK-8319123 : Implementation of JEP-461: Stream Gatherers (Preview) [v2]

[Viktor Klang]

On Wed, 8 Nov 2023 21:08:03 GMT, Viktor Klang <vklang at openjdk.org> wrote:

>> This Pull-Request implements [JEP-461](https://openjdk.org/jeps/461)
>
> Viktor Klang has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Addressing review feedback
>  - Make Gatherer.andThen take a wildcard for the rhs Gatherer state type

src/java.base/share/classes/java/util/stream/Stream.java line 1106:

> 1104:         return StreamSupport.stream(spliterator(), isParallel())
> 1105:                             .gather(gatherer)
> 1106:                             .onClose(this::close);

@AlanBateman Also added onClose hook.

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PR Review Comment: https://git.openjdk.org/jdk/pull/16420#discussion_r1387205090