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From "Pinaki Poddar" <ppod...@bea.com>
Subject RE: [jira] Commented: (OPENJPA-305) Dynamic configuration of EntityManagerFactory
Date Wed, 19 Sep 2007 02:08:10 GMT
> 4. ConfigurationImpl used to compute its hashCode() and equals() by
first converting itself into a Properties object. 
> I do not why.
Some pointers on why converting to Properties before equals/hashCode?


Pinaki Poddar
972.834.2865
 

>-----Original Message-----
>From: Patrick Linskey (JIRA) [mailto:jira@apache.org] 
>Sent: Tuesday, September 18, 2007 9:03 PM
>To: dev@openjpa.apache.org
>Subject: [jira] Commented: (OPENJPA-305) Dynamic configuration 
>of EntityManagerFactory
>
>
>    [ 
>https://issues.apache.org/jira/browse/OPENJPA-305?page=com.atla
>ssian.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.
>>  
>
>--
>This message is automatically generated by JIRA.
>-
>You can reply to this email to add a comment to the issue online.
>
>

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