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

[Strong Liu (JIRA)]

     [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-4055?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Strong Liu resolved HHH-4055.
-----------------------------

       Resolution: Fixed
    Fix Version/s: 4.0.0.next

I believe this is possible now in hibernate 4.0 by the new introduced ServiceRegistry

since RegionFactory is now a Service, you can build your own service impl and return your own UpdateTimestampCache impl

> 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.
>             Fix For: 4.0.0.next
>
>
> 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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