Yeah, migrating to ObjectContext is now a prerequisite.
Won't comment on the specifics now, but the design direction with
this was to minimize the number of methods in the ObjectContext
interface, so a few DataContext methods didn't make it there. I guess
we need to pull to DataObjectUtils any remaining "derived"
DataContext methods that can be executed on a generic ObjectContext.
Andrus
On Mar 16, 2007, at 2:27 AM, Lachlan Deck wrote:
> Hello again,
>
> On 15/03/2007, at 12:15 AM, Andrus Adamchik wrote:
>
>> One last try at guessing it. On the server you have to do some
>> magic to enable callbacks (hopefully eventually this will be more
>> transparent). See "Enabling Callbacks" chapter at the bottom of
>> this page:
>>
>> http://cayenne.apache.org/doc/lifecycle-callbacks.html
>>
>> if this doesn't help, please file a bug with code samples.
>
> You were right. I'd not read far enough down the page. It is
> somewhat convoluted to implement I must say. I'm now subclassing
> ObjectContextCallbackInterceptor to add a couple of methods to it
> (e.g., like hasChanges() etc from DataContext).
>
> There's one other problem that this now imposes: previously using a
> DataContext we could do:
> Object someInstance = dc.objectFromDataRow( entityClass,
> someDataRow, refreshes );
>
> Would this now be the best solution?
>
> public class ObjectContext extends ObjectContextCallbackInterceptor
> {
> private DataContext _dataContext;
> <...>
> public DataObject objectFromDataRow( Class entityClass, DataRow
> paymentRow, boolean refresh )
> {
> DataObject anObject;
>
> anObject = _dataContext.objectFromDataRow( entityClass,
> paymentRow, refresh );
> if ( anObject != null )
> return ( DataObject )localObject( anObject.getObjectId(),
> anObject );
> return null;
> }
> }
>
> Otherwise it seems to return an object that seems to be in the
> wrong context so far as addToOneRelationship etc is concerned...
>
> Be nice if ObjectContext, DataContext et al were better unified. Or
> that DataObjectUtils could return an object for a DataRow to
> abstract all this.
>
> with regards,
> --
>
> Lachlan Deck
>
>
>
>
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