JPOXers, Please note that the current JPOX behaviour will change to align with JDO 2 spec.
Please track a discussion on vendor extension here http://www.jpox.org/servlet/jira/browse/CORE-2741 Regards, Quoting Craig L Russell <[EMAIL PROTECTED]>: > Hi Jörg, > > On Mar 9, 2006, at 1:43 AM, Jörg von Frantzius wrote: > > > Craig L Russell schrieb: > >>> Also I find it confusing that the method most prominently used > >>> for inserting new objects shouldn't do so for detached instances. > >> > >> There is a bunch of history that you should look at, most of which > >> is in the jdo-dev archives. Bottom line, we used to have a > >> different API, attachCopy, but we looked at what it had to do for > >> transient and detached instances and decided that it wasn't worth > >> making a different API for attaching detached instances. > > That particular behaviour of attachCopy() wasn't really specified, > > but it was pleasant JPOX-specific behaviour, if I remember > > correctly. I saw the discussion and I didn't see where inserting > > the instances would be forbidden by the spec, and still I don't see > > where it says that, especially in the light of 12.6.7. Please > > excuse my ignorance, where does it say that? > > <spec> > These methods make transient instances persistent and apply detached > instance changes > to the cache. > ... > For a detached instance, they locate or create a persistent > instance with the same JDO identity as the detached instance, and > merge the persistent > state of the detached instance into the persistent instance. Only the > state of persistent fields > is merged. > </spec> > > This means that if there is already a persistent instance in the > cache with the same object id as the detached instance, the detached > state will be merged. If there is not a persistent instance in the > cache, a cache instance is created and the detached state is merged > with the persistent instance. > > But there is no creation aspect of makePersistent on a detached > instance. > > Craig > > >> > >> Regards, > >> > >> Craig > >> > >>>> > >>>> Craig > >>>> > >>>> On Mar 8, 2006, at 7:14 AM, Erik Bengtson wrote: > >>>> > >>>>> > >>>>> > >>>>> Hi, > >>>>> > >>>>> What happens when we invoke makePersistent on a detached > >>>>> instance that was > >>>>> deleted by another isolated process? I suspect that we raise an > >>>>> exception > >>>>> instead of reinserting it for a second time. Is that right? > >>>>> > >>>>> Maybe this can be clarified in the spec. > >>>>> > >>>>> Regards, > >>>> > >>>> Craig Russell > >>>> Architect, Sun Java Enterprise System http://java.sun.com/ > >>>> products/jdo > >>>> 408 276-5638 mailto:[EMAIL PROTECTED] > >>>> P.S. A good JDO? O, Gasp! > >>>> > >>> > >>> > >> > >> Craig Russell > >> Architect, Sun Java Enterprise System http://java.sun.com/products/ > >> jdo > >> 408 276-5638 mailto:[EMAIL PROTECTED] > >> P.S. A good JDO? O, Gasp! > >> > > > > Craig Russell > Architect, Sun Java Enterprise System http://java.sun.com/products/jdo > 408 276-5638 mailto:[EMAIL PROTECTED] > P.S. A good JDO? O, Gasp! > >
