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From Craig L Russell <Craig.Russ...@Sun.COM>
Subject Fwd: Negative VOTE Issue 103: Embedded instances in detached instances
Date Mon, 13 Feb 2006 22:22:14 GMT
Omitted the jdo-dev alias by mistake.

Craig

Begin forwarded message:

> From: Craig L Russell <Craig.Russell@Sun.COM>
> Date: February 13, 2006 9:27:34 AM PST
> To: JDO Expert Group <jdo-experts-ext@Sun.COM>
> Subject: Negative VOTE Issue 103: Embedded instances in detached  
> instances
>
> Javadogs,
>
> Please reply if you have objections.
>
> Here's Andy Jefferson's comments on detached embedded:
>
> The latest spec includes "jdoModifiedFieldList" as a way of  
> tracking changes to detached objects whilst detached, being updated  
> by the jdoSetXXX methods. Well lets take the case of a PC object  
> embedded within another PC object. The
> owner PC object is detached, so that detaches the embedded object  
> too since we've declared it in the fetch plan.
>
> The detached embedded PC has no identity of its own being persisted  
> into the table of the owner PC, and so has jdoObjectId as null.  
> When this object is detached calling isDetached() returns false if  
> we base PC.isDetached() solely
> on whether it has an id and no StateManager. Is this what we'd want  
> to see ? The owner is clearly detached, but the embedded has no  
> identity of its own ...
>
> I'd expect to still track the changes to its fields using  
> jdoModifiedFieldList, because without that we lose all dirty  
> information. Is this correct ?
>
>
> Here's the proposed spec update:
>
> <proposed 12.6.8>
> Changes made to embedded instances of mutable types including  
> persistence-capable types are tracked by the detached instance if  
> they are replaced or modified. Changes are reflected by marking the  
> detached instance’s field as modified.
> </proposed 12.6.8>
>
> 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!
>

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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