RFR: 8328919: Add BodyHandlers / BodySubscribers methods to handle excessive server input [v5]

[Jaikiran Pai]

On Wed, 15 Jan 2025 10:50:55 GMT, Volkan Yazıcı <duke at openjdk.org> wrote:

>> Adds `limiting()` factory methods to `HttpResponse.Body{Handlers,Subscribers}` to handle excessive server input in `HttpClient`. I would appreciate your input whether `discardExcess` should be kept or dropped. I plan to file a CSR once there is an agreement on the PR.
>
> Volkan Yazıcı has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove concurrency measures (methods are accessed serially due to the Reactive Streams spec)

src/java.net.http/share/classes/jdk/internal/net/http/LimitingSubscriber.java line 58:

> 56:     private interface State {
> 57: 
> 58:         enum Terminated implements State { INSTANCE }

This was a bit confusing to read. I find the following to be a bit more easier to read:


	private interface State {
		State TERMINATED = new State() {};

		record Subscribed(Object subscription) implements State {}
	}

The call sites would then just use `State.TERMINATED`. 

However, if you prefer it in its current form, it's fine with me.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23096#discussion_r1916808060