[jira] [Created] (WW-5672) Allow per-cache size configuration for the localized-text provider caches

["Lukasz Lenart (Jira)" <ji...@apache.org>]

Lukasz Lenart created WW-5672:
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             Summary: Allow per-cache size configuration for the localized-text provider caches
                 Key: WW-5672
                 URL: https://issues.apache.org/jira/browse/WW-5672
             Project: Struts 2
          Issue Type: Improvement
            Reporter: Lukasz Lenart
             Fix For: 7.4.0


Follow-up to WW-5668.

WW-5668 gave the localized-text provider caches a configurable bound, but deliberately shipped a single setting: {{struts.i18n.cacheMaxSize}} applies the same maximum to every one of them.

Those caches do not have the same natural size. The class- and package-hierarchy caches are keyed by a message key combined with a class or package, so their population scales with the application's action and key count. The bundle, message-format and missing-bundle caches are keyed with the locale, so their population scales with locale diversity instead. Sizing them together means one shared number is either generous for the small caches or too tight for the large ones, and an operator tuning for one cannot avoid affecting the others.

Allow the individual caches to be sized separately, while keeping a single setting that sets the default for all of them so existing configurations continue to work untouched.

Note the 6.x maintenance line has three of these caches rather than five; the hierarchy caches arrived with WW-5540 on the 7.x line only.

h2. Scope / acceptance
* Each localized-text cache can be given its own maximum size.
* {{struts.i18n.cacheMaxSize}} continues to work as the default for any cache that is not sized individually; an application setting only that value sees no change in behaviour.
* Defaults documented in {{default.properties}} alongside the existing entries.
* Tests cover that an individually configured bound is honoured and does not affect the other caches.



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