[jira] Assigned: (JDO-630) Support specification of exact class in SingleFieldIdentity

["Andy Jefferson (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/JDO-630?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andy Jefferson reassigned JDO-630:
----------------------------------

    Assignee:     (was: Andy Jefferson)

DN SVN trunk now passes JDO2 TCK. Marking unassigned in case some more is required on this (e.g in the spec to say that if the user is handed an object at an incorrect inheritance level, then at first load of fields a JDOObjectNotFoundException will be thrown).

> 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: specification, tck2
>            Reporter: Andy Jefferson
>             Fix For: JDO 2 maintenance release 3
>
>         Attachments: jdo-630.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

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