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Posted to dev@openjpa.apache.org by "Kevin Sutter (JIRA)" <ji...@apache.org> on 2010/02/24 00:54:28 UTC
[jira] Commented: (OPENJPA-1532) Should the
element in a persistence unit definition automatically turn on the data
cache?
[ https://issues.apache.org/jira/browse/OPENJPA-1532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12837529#action_12837529 ]
Kevin Sutter commented on OPENJPA-1532:
---------------------------------------
Absolutely, the JPA 2 <shared-cache-mode> element should affect the existing OpenJPA DataCache enablement. That should be part of the integration work. I am reading the spec like you are and the <shared-cache-mode> affects whether to use an L2 cache for caching entities or not. I read that to mean that it should also affect the enablement of the cache. Unless we can find something in the spec that indicates otherwise, I would say that this is a bug.
> Should the <shared-cache-mode> element in a persistence unit definition automatically turn on the data cache?
> -------------------------------------------------------------------------------------------------------------
>
> Key: OPENJPA-1532
> URL: https://issues.apache.org/jira/browse/OPENJPA-1532
> Project: OpenJPA
> Issue Type: Question
> Components: datacache
> Affects Versions: 2.0.0-M1, 2.0.0-M2, 2.0.0-M3, 2.0.0-beta, 2.0.0, 2.0.1, 2.1.0
> Reporter: Jody Grassel
> Priority: Minor
>
> The JPA 2.0 spec introduces a new persistence unit definition element, <shared-cache-mode>, which accepts NONE, ALL, ENABLE_SELECTIVE, and DISABLE_SELECTIVE. The JPA 2.0 spec section 3.7.1 documents the behavior of each of those modes.
> What I am curious about is if the use of <shared-cache-mode> should implicitly enable OpenJPA's data cache plugin. Currently, the above element is completely ignored if the persistence unit is missing the properties: openjpa.DataCache=true and openjpa.RemoteCommitProvider=sjvm (because by default, OpenJPA disables data caching). My interpretation of the spec suggests that <shared-cache-mode> is not only a platform-independent method of instructing the data cache which entities are eligible for admittance to the data cache, but it is also a switch providing a platform-independent method of both turning the data cache on or off (since whether the cache is enabled by default is platform-specific). Otherwise, why have a NONE value, if it was not intended to be a platform independent means of turning the data cache off?
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