[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-4055) make UpdateTimestampsCache pluggable, like QueryCache

[Keith Mashinter (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-4055?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=33882#action_33882 ] 

Keith Mashinter commented on HHH-4055:
--------------------------------------

I vote for this as well.  I'm working on a NamedScalarQueryCache that works more like HTTP URL caches where it works by timeout or forced invalidation but doesn't evict by any-row-change.  This is more for the case where we want to select a summary of information and don't care if it changes second-to-second but would rather cache the results for at least a few minutes if not more.

> make UpdateTimestampsCache pluggable, like QueryCache
> -----------------------------------------------------
>
>                 Key: HHH-4055
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-4055
>             Project: Hibernate Core
>          Issue Type: Improvement
>          Components: caching (L2)
>    Affects Versions: 3.3.2
>         Environment: all
>            Reporter: A. R.
>
> According to https://www.hibernate.org/213.html, one can plug-in one's own query cache using hibernate.cache.query_cache_factory, e.g. to chose a cache strategy that is not based on updateTimestamps.
> However, Hibernate's SessionFactoryImpl will always create an UpdateTimestampsCache if the Query Cache is enabled, even for custom Query Caches. This UpdateTimestampsCache then is always used in org.hibernate.engine.ActionQueue.execute() and afterTransactionCompletion(). Since the UpdateTimestampsCache is synchronized, this can cause bottlenecks when many threads change things (see http://tech.puredanger.com/2009/07/10/hibernate-query-cache/)..
> Please make the UpdateTimestampsCache also pluggable, so that one can truly and completely plug one's own Query Cache without using a Update-Timestamps or with a custom UpdateTimestampCache.

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