RFR: 7105350: HttpExchange's attributes are the same as HttpContext's attributes [v2]

[Daniel Fuchs]

On Tue, 7 Oct 2025 16:10:20 GMT, Josiah Noel <duke at openjdk.org> wrote:

>> Now ExchangeImpl will default to having a separate attribute map for the request duration.
>
> Josiah Noel has updated the pull request incrementally with one additional commit since the last revision:
> 
>   require non null

I agree with @Michael-Mc-Mahon that we will need a test to verify both old (with property set) and new behavior. Also this change will require a CSR and release notes.

Otherwise the proposed solution looks good. I believe it meets what a user reading the documentation would expect: get/set attributes on context get/set attributes for the whole context and may be observed by all exchanges that operate on this context. get/set attribute on the exchange get/set attributes whose scope is limited to that particular exchange.

This was a long standing issue and I'm happy to see it fixed. Thanks for driving that @SentryMan and @Michael-Mc-Mahon !

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PR Review: https://git.openjdk.org/jdk/pull/27652#pullrequestreview-3314681395