[
https://issues.apache.org/jira/browse/JDO-630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12702375#action_12702375
]
Andy Jefferson commented on JDO-630:
------------------------------------
Since in the weekly meeting minutes people were wanting an identity to be
non-mutable from construction and after studying the usage of such identities
I've come to the conclusion that it would probably be better to just add a new
method on the PM (as per the original mailing list request - 22/07/2008). The
only place a SingleFieldIdentity "id" can be considered "not exact" is where
the user has input it into PM.getObject[s]ById(...) AFAICS. All objects
returned by the implementation will have exact ids. All ids returned by
PM.getObjectId() will also be exact.
This would imply adding the following :-
Object getObjectById(String id, boolean validate, boolean checkInheritance);
Object[] getObjectsById(boolean validate, boolean checkInheritance, Object...
ids);
The other benefit of this would be in terms of memory, one boolean less
overhead per object.
Comments ?
> Support specification of exact class in SingleFieldIdentity
> -----------------------------------------------------------
>
> Key: JDO-630
> URL: https://issues.apache.org/jira/browse/JDO-630
> Project: JDO
> Issue Type: Improvement
> Components: api2
> Reporter: Andy Jefferson
> Fix For: JDO 2 maintenance release 3
>
> Attachments: singlefieldidentity_exact.patch
>
>
> When calling PersistenceManager.getObjectById() with a SingleFieldIdentity,
> there seems to be no way of avoiding the following
> (if the implementation decides to do so):
> "It is an implementation decision whether to access the data store, if
> required to determine the exact class. This will be the case of inheritance,
> where multiple <code>PersistenceCapable</code> classes share the same
> ObjectId class."
> Now when I know for sure that the targetClassName of the given
> SingleFieldIdentity already denotes the correct class for the given id, how
> can I avoid that additional roundtrip to the database for finding the exact
> class?
> It would be useful to have a way of specifying a SingleFieldIdentity to be
> for the exact class specified. This could be done by addition of methods
> void setExact(boolean flag);
> boolean getExact();
> to SingleFieldIdentity
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
