RFR: 8376403: Avoid loading ArrayDeque in java.util.zip.ZipFile [v4]

Eirik Bjørsnøs eirbjo at openjdk.org
Thu Feb 26 12:06:43 UTC 2026


On Fri, 20 Feb 2026 12:51:12 GMT, Eirik Bjørsnøs <eirbjo at openjdk.org> wrote:

>> Hot on the heals of #29288, this PR replaces `ArrayDeque` with `ArrayList` for the Inflater cache implementation in `ZipFile.CleanableResource`.
>> 
>> With this PR, we change the order of the cache from a FIFO queue to a LIFO stack backed by ArrayList. The order seems unimportant, and has indeed been LIFO in the past when using `java.util.Vector`. Intuitively, it should be better to return the most recently used Inflater.
>> 
>> No tests updated, strict refactoring, `noreg-cleanup`.
>
> Eirik Bjørsnøs has updated the pull request incrementally with three additional commits since the last revision:
> 
>  - Add code comment about returning the most recently used Inflater from the cache
>  - Replace polling-style iteration with simple for loop
>  - Using add instead of addLast seems more natural for a List

With reviews from Jaikiran and Lance and Victor's question answered, I'l go ahead and integrate this now.

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PR Comment: https://git.openjdk.org/jdk/pull/29430#issuecomment-3966180927


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