RFR: 8279917: Refactor subclassAudits in Thread to use ClassValue

Thu Jan 13 10:05:24 UTC 2022

On Wed, 12 Jan 2022 19:39:29 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

> Thread.java would benefit from a refactoring similar to JDK-8278065 to use ClassValue instead of the somewhat problematic WeakClassKey mechanism.
> 
> Testing:
>  - [x] tier1
>  - [x] tier2
>  - [x] tier3

src/java.base/share/classes/java/lang/Thread.java line 1671:

> 1669:     /** cache of subclass security audit results */
> 1670:     /* Replace with ConcurrentReferenceHashMap when/if it appears in a future
> 1671:      * release */

Is it still desirable to use `ConcurrentReferenceHashMap` as suggested in comment? Or ClassValue is better choice?

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PR: https://git.openjdk.java.net/jdk/pull/7054