That nudge should have been for rollbackChangesLocally() - CAY-716. Sorry Andrus.
> -----Original Message-----
> From: Philip Miller [mailto:philip.mille..bc.co.uk]
> Sent: 07 January 2008 14:29
> To: use..ayenne.apache.org
> Subject: RE: Selective commit
>
> Nested data contexts may also help you to isolate atomic
> changes to the object graph. Especially when the
> commitChangesLocally() method is implemented (nudge ;). Check
> out DataContext.createChildDataContext().
>
>
>
> > -----Original Message-----
> > From: Andrus Adamchik [mailto:andru..bjectstyle.org]
> > Sent: 07 January 2008 13:32
> > To: use..ayenne.apache.org
> > Subject: Re: Selective commit
> >
> > Hi Álvaro,
> >
> > It is hard to give a precise advice on multithreading
> without knowing
> > the nature of your application. So here is a few general notes:
> >
> > * DataContext instance is your isolated area for making in-memory
> > changes to objects that will all be committed at once. So consider
> > using multiple contexts as appropriate.
> > Cayenne docs recommend various common patterns, such as DataContext
> > per session (i.e. each user has a dedicated context),
> DataContext per
> > request, or DataContext per application (in a read-only
> app). You can
> > also devise your own approach, if none of the above fit your needs.
> > All you need to know here is that multiple threads *reading* from a
> > shared DataContext is ok, but multiple threads *writing* to
> a shared
> > DataContext is not ok.
> >
> > * In a rare case if you really need multiple threads to work off of
> > the same context, consider using a dedicated nested DataContext for
> > each atomic object modifications.
> >
> > Andrus
> >
> >
> > On Jan 7, 2008, at 2:44 PM, Álvaro Martínez wrote:
> > >
> > > Hi, I've been working for a while with Cayenne but never
> realized I
> > > had a problem... until I got a weird exception.
> > >
> > > The fact is that I had been using context.newObject() and
> > > context.commitChanges() to create new rows in the
> database. But my
> > > application works with many threads, so global commits
> can (and in
> > > fact do) interrupt normal creation of objects. Thread A and
> > Thread B
> > > are creating objects and filling their fields, but then B
> > commits all
> > > and A throws a validation exception because mandatory fields are
> > > missing.
> > >
> > > How could I commit only one object?
> > >
> > > Thanks,
> > >
> > > Álvaro from Spain (Push the button Inc.)
> > >
> > >
> > >
> >
> >
>
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