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From "Pinaki Poddar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OPENJPA-1532) Should the <shared-cache-mode> element in a persistence unit definition automatically turn on the data cache?
Date Mon, 24 Sep 2012 18:03:07 GMT

    [ https://issues.apache.org/jira/browse/OPENJPA-1532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13461949#comment-13461949
] 

Pinaki Poddar commented on OPENJPA-1532:
----------------------------------------

Whether <shared-cache-mode> activates data cache or not -- is not the issue I have raised.
In fact I tend to agree that shared-cache-mode should activate Data Cache. My concern is *how*
it is to be done.doing it in a case-by-case basis is weaker design construct. A design to
support co-dependent configuration should be followed.   
                
> 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
>            Assignee: Rick Curtis
>            Priority: Minor
>         Attachments: 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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