RFR: 8328919: Add BodyHandlers / BodySubscribers methods to handle excessive server input [v3]

[Volkan Yazıcı]

On Tue, 14 Jan 2025 20:46:14 GMT, Daniel Fuchs <dfuchs at openjdk.org> wrote:

>> Volkan Yazıcı has updated the pull request incrementally with four additional commits since the last revision:
>> 
>>  - Make `LimitingSubscriber` stateful
>>  - Improve Javadoc
>>  - Replace `IllegalStateException` with an `IOException`
>>  - Remove `discardExcess` argument
>
> Thanks for taking into account the feedback! Some more comments.

@dfuch, 144ce26a2c0889b9b8b31d2a9ae67c3778f7715b removes concurrency measures, since [the Reactive Streams specification](https://github.com/reactive-streams/reactive-streams-jvm) states that publishers MUST access subscriber methods serially – run this through @viktorklang-ora.

I will further try implementing [Reactive Streams TCK](https://github.com/reactive-streams/reactive-streams-jvm/tree/master/tck-flow) tests for the new subscriber.

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PR Comment: https://git.openjdk.org/jdk/pull/23096#issuecomment-2592307881