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From Craig L Russell <Craig.Russ...@Sun.COM>
Subject Vote: Remove/deprecate 'Implements' annotation and XML element
Date Fri, 12 Oct 2007 15:45:41 GMT
Hi Ilan,

+1 to remove/deprecate the implements element and @Implements  

If no adverse comments are received by Tuesday October 16, it's gone.

On Oct 4, 2007, at 4:15 PM, Ilan Kirsh wrote:

> Hi,
> The 'Implements' annotation (and the equivalent XML element) remind me
> the 'persistence-capable-superclass' XML attribute that is  
> deprecated now.

Yes, for JDO 1, we tried to have it possible to enhance classes when  
not all of its dependencies (superclasses and implemented interfaces)  
were available for loading and analysis. In this environment, it was  
necessary to explicitly declare which interfaces were implemented  
because you could not load all of the directly implemented interfaces  
to see which persistence-capable interfaces were indirectly inherited.

But now, enhancement requires access to the entire inheritance tree  
and it makes sense to also require the implements tree as well.
> If persistence capable interfaces are marked as such by annotations
> (or in the XML metadata), why should we have this duplication?
> Implementations should be able to find implemented persistence capable
> interfaces as they find a super persistence capable class.

True, and I support deprecating the xml attribute and removing the  
@Implements annotation.

Unless someone can justify why there would be any semantic difference  
between explicitly declaring the interfaces versus the enhancer  
finding them. The only thing I can think of is whether an explicitly  
named interface would have an extent managed, but I think that you  
can only query over the extent of classes/interfaces that themselves  
declare that an extent is managed.

> Ilan Kirsh
> ObjectDB Software
> http://www.objectdb.com

Craig Russell
Architect, Sun Java Enterprise System http://java.sun.com/products/jdo
408 276-5638 mailto:Craig.Russell@sun.com
P.S. A good JDO? O, Gasp!

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