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From "Craig L Russell (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JDO-667) Extend PersistenceManageFactory to return all known entity classes
Date Fri, 29 Oct 2010 17:25:24 GMT

    [ https://issues.apache.org/jira/browse/JDO-667?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12926362#action_12926362

Craig L Russell commented on JDO-667:

Given that the JDO implementation keeps track of persistence-capable and persistence-aware
classes, it makes sense for the application to get the collection of such classes.

And given that it's awkward for the application itself to manage the name-to-class mapping,
it also makes sense for the return type of the PersistenceManagerFactory getManagedClasses()
method to be Collection<java.lang.Class<?>>.

As far as the requirements for what classes are returned, I'd say it should be pretty loose.
I agree with you that the result must include all classes that have been referenced by all
PMs obtained from the PMF. Referenced would be those as parameters in getExtent(...), newQuery(...),

I'd also add that the result may include other classes that the implementation has loaded
based on implementation policy or non-standard features.

> Extend PersistenceManageFactory to return all known entity classes
> ------------------------------------------------------------------
>                 Key: JDO-667
>                 URL: https://issues.apache.org/jira/browse/JDO-667
>             Project: JDO
>          Issue Type: New Feature
>    Affects Versions: JDO 3
>            Reporter: Marco
>             Fix For: JDO 3 maintenance release 1
> JDO 3 now has the ability to declare meta-data programmatically. Part of this feature
is the ability to ask the PersistenceManagerFactory via the method getMetadata(java.lang.String)
for the meta-data of one single class. But there is no way to list all known classes.
> I therefore kindly ask for a new method in PersistenceManagerFactory like this:
> Collection<String> getClassesWithMetadata();
> Btw., this is Andy's suggestion posted here: http://www.datanucleus.org/servlet/forum/viewthread_thread,6379#33224
> I'd greatly appreciate, if this method became a part of JDO 3.1.
> Edit 1: I just saw the various overloaded methods getManagedObjects(...) in PersistenceManager
- maybe the alternative method name "getManagedClasses()" would be more consistent?

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