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

[A. R. (JIRA)]

make UpdateTimestampsCache pluggable, like QueryCache
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                 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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