Hi Bert (and Steffen), As far as adding notification support in Tuscany is concerned, it would not be very difficult, given the underlying EMF implementation. Tuscany uses the EMF notification framework to implement ChangeSummary, so it wouldn't be hard to provide a way to allow (UI) observers to also be attached. What we don't want is for users to use the underlying EMF EAdapter API directly, because EMF is considered an internal implementation detail which is subject to change. Unfortunately, since SDO does not provide a standard API for doing this, we will need to come up with something Tuscany-specific, but longer term we could try to push a design back into the SDO spec (version 3).
So, I'd be very interested in any ideas you have, and to see how you've done it. Please do explain more details. Thanks, Frank. [EMAIL PROTECTED] wrote on 06/12/2007 03:23:21 AM: > This is actually one of the main reasons why we don't use the Tuscany SDO > implementation. We made our own proprietary implementation of the SDO spec > in order to be able to bind our DataObjects into our UI framework. > > As a matter of fact, our implementation implements databinding as an > extension. In its core, it just implements the SDO spec. But it allows > without too much work to extend the implementation in a separate > component. This separate component implements databinding. It's fairly > small because it only needs to deal with this databinding. > If people are interested, I can explain this in more detail. > > Maybe Tuscany could allow something like this as well? > > Bert > > > > > "Steffen Glomb" <[EMAIL PROTECTED]> > 11/06/2007 19:14 > Please respond to > tuscany-user@ws.apache.org > > > To > tuscany-user@ws.apache.org, [EMAIL PROTECTED] > cc > > Subject > Re: Databinding, dataobject <-> UI Component > > > > > > > > Hi Kelvin, > > thank you for your response. I conclude: > -> no automatic databinding from the dataobjects to UI Components in the > Swing world with SDO Spec. > > I have hard time to understand why this is (intentionally?) omitted. > > Its a small step to some form of JavaBean PropertyChangeSupport. > > Maybe anyone has a link to where this might have been discussed? > > Thanks > Steffen > > > > On 6/11/07, kelvin goodson <[EMAIL PROTECTED]> wrote: > > > > Steffen, > > > > there's no provision in the SDO API for receiving direct notification > of > > changes to values. It would be an unportable and fragile thing to do to > > rely > > on the EMF underpinnings of the Tuscany SDO implementation. I don't > think > > > > there is anything to offer here from the pure SDO API level. > > > > Regards, Kelvin. > > > > On 10/06/07, Steffen Glomb <[EMAIL PROTECTED]> wrote: > > > > > > hopefully common Scenario: > > > Using SDO in a Swing Rich Client application, > > > pulling the datagraph to the client. Fields from in the User Interface > > are > > > bound to properties of the dataobjects in the graph. > > > Client side business logic causes changes in the dataobjects. > > > One might want to have these changes automatically synchronized to the > > UI > > > Components. > > > > > > > > > Problem: > > > I am having difficulties finding a simple way to implement the data > > > binding. > > > > > > > > > Question: > > > How can i get the change notification from the dataobject? > > > ( dataobject.eAdapters() returns an umodifieable list) > > > > > > Solution? > > > The only way i found to accomplish this is through adding an adapter > to > > > the changesummary and unscrambling the changeentries as they are > added. > > > > > > Is this the intended way? why is the changenotification of EObjectImpl > > cut > > > off ? > > > > > > > > > Thanks for sharing your expertise > > > Steffen > > > > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
