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 117:

> 115: 
> 116:     private boolean allocateLength(List<ByteBuffer> buffers) {
> 117:         long bufferLength = buffers.stream().mapToLong(Buffer::remaining).sum();

More of a FYI than asking you to replace this - we have a `jdk.internal.net.http.common.Utils.remaining(List<ByteBuffer>)` which returns the same.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23096#discussion_r1916783899