[elephant-devel] persistent vs persistent-object

[Ian Eslick]

I'd have to go back and review the details, but originally persistent- 
objects had additional functionality for user-generated slots and the  
slot access protocol that differed from persistent-collection.

persistent - provides functionality for anything which is resident in  
the data store - basically oid and controller references.

persistent-object (persistent) - provides a base class for anything  
using the persistent object protocol for slot accesses.

persistent-collection (persistent) - inherits directly from persistent  
and is a placeholder for methods or data common to all collections  
(for now that's basically nothing).

Ian

On Jun 15, 2008, at 12:55 PM, Glenn Tarcea wrote:

>
> Hey guys, I'm trying to understand why user classes inherit from  
> persistent-object, rather than persistent (that is why is there a  
> distinction and separation of functionality). I can see that the  
> initialization for persistent-object uses more of the elephant  
> classes (eg, all the different kinds of slot), and it kind of looks  
> like internal Elephant classes that need access to the underlying  
> infrastructure but don't need transient slots, etc... use persistent  
> and then have greater control over the rest. Am I on the right track?
>
> Thanks,
>
> Glenn
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