[news.eclipse.tools.emf] Re: [CDO] CDOSavePoint and rollback question

[Simon McDuff <smcduff@xxxxxxxxxxx>]

hi Kai,

Kai Schlamp wrote:
> Hello.
>
> I have a question about using CDOSavePoint and rollback.
Excellent!!! Nobody asked questions about CDO this week !!! I was 
worried!! :-)

> Let's assume the following scenario:
> We have an EMF/CDO model that exists of an "ElementStore" that contains 
> an "Element1" and an "Element2" (and those elements have some attributes).
> Also let's assume we have two clients that work on this CDO model.
> Client 1 now write locks Element1, sets a save point and edits Element1. 
CLient1:
element1.cdoWriteLock().lock();
transaction1.setSavepoint();
element1.setName("sss");

> In the meantime client 2 edits Element2. 

Client2:
element2.setname("sss2");

As passive updates are enabled
> on client1, Element2 on client 1 is automatically updated with those 
> changes.
If client1 received notification this mean you committed trans2... right?

so I will change client2 for the following:
Client2:
element2.setName("sss2");
transaction2.commit();

> Now when client 1 rolls back to the save point (without transmitting 
> anything before), all changes in Element1 (made by client 1) and Element2 (by 
> client 2) are undone.
False, setSavePoint only apply the changes made locally. in this case 
only element.setName("sss") will be rolled back.

> Is that right? If yes, is there a way to only roll back those changes 
> that were done by client 1 itself (in this case only undo Element1 
> changes).
If this is what you observed it is a problem... it should not be like 
that. Did you experienced such things ?

When you said you had two clients.... I assumed you had 2 
transactions... is it the case ?
> Regards,
> Kai

Simon