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Rick Curtis commented on OPENJPA-1532:
--------------------------------------
Committed test/code to trunk.
Thanks for the patch Helen!
> 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, 2.1.0, 2.2.0
> Reporter: Jody Grassel
> Assignee: Rick Curtis
> Priority: Minor
> Fix For: 2.3.0
>
> Attachments: OPENJPA-1532-Doc.patch, OPENJPA-1532.patch, OPENJPA-1532.patch.txt
>
>
> 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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