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From "Patrick Linskey (JIRA)" <j...@apache.org>
Subject [jira] Commented: (OPENJPA-305) Dynamic configuration of EntityManagerFactory
Date Wed, 19 Sep 2007 02:02:43 GMT

    [ https://issues.apache.org/jira/browse/OPENJPA-305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12528633
] 

Patrick Linskey commented on OPENJPA-305:
-----------------------------------------

Generally, it looks good. Some comments:

I don't understand why we do the isDynamic() check in equals() and hashCode(), though; shouldn't
getOriginalValue() always be correct?

Also, it looks like there's a synchronization issue at hand -- based on my reading, dynamic
sets must occur in a synchronized manner, or the behavior is non-deterministic. That is OK
(I don't think that we necessarily want to add synchronization on accesses), but should be
well-documented.

> Dynamic configuration of EntityManagerFactory
> ---------------------------------------------
>
>                 Key: OPENJPA-305
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-305
>             Project: OpenJPA
>          Issue Type: New Feature
>            Reporter: Pinaki Poddar
>         Attachments: openjpa-305.patch.1.txt
>
>
> OpenJPA configures EntityManagerFactory at creation time via an instance of Configuartion
object. Once EntityManagerFactory is created and a EntityManager is issued from it -- the
Configuration is frozen by design. That is no further changes to Configuration is allowed
as long as EntityManagerFactory lives.
> For certain configuration properties, it is desirable to change them during the lifetime
of a EntityManagerFactory.
> This issue is raised to initiate a discussion on such a feature, the possibility and
limitations of dynamic update and track the impact of such a change as frozen Configuration
is an important assumption.
>  

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