On Thu, 9 Nov 2023 14:41:10 GMT, Alan Bateman <al...@openjdk.org> wrote:

>> 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/Gatherers.java line 562:
> 
>> 560:     /**
>> 561:      * An operation which executes operations concurrently
>> 562:      * with a fixed window of max concurrency, using VirtualThreads.
> 
> Of the 5, this is the one that I'm not sure about so will be interesting to 
> see if there is feedback from real world usage.
> 
> "VirtualThreads" isn't a class so maybe replace it with "virtual Threads", 
> linked to Thread.html#virtual-threads.

Sounds good. Wilco

> src/java.base/share/classes/java/util/stream/Gatherers.java line 615:
> 
>> 613:                 assert wasAddedToWindow;
>> 614: 
>> 615:                 Thread.startVirtualThread(task);
> 
> At some point it might be worth seeing this should should use 
> Executors.newVirtualThreadPerTaskExecutor(), that would at least simplify the 
> cleanup as it would be executor.shutdownNow.  The serviceability benefit 
> would be that an observer on a far hill taking a thread dump would have the 
> virtual threads grouped for each mapConcurrent gatherer.

Yeah, that's a good point. I'll try that after this PR. 👍

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/16420#discussion_r1388591370
PR Review Comment: https://git.openjdk.org/jdk/pull/16420#discussion_r1388591204

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