Tim Pedone wrote:
>
> Hello,
>
> We've started creating an object model that we are going to implement using EJB.
>I've come across a fundamental design issue that I'm not sure how to solve. We have
>two beans: ControlParamBean and ActivityBean (along with their associated interfaces
>ControlParam and Activity). ControlParam has a method called setActivty() that takes
>an Activity as an argument. This method will be called from the client. Activity
>has a method called addControlParam() that takes a ControlParam argument. The body
>of ActivityBean.addControlParam() looks like this:
>
> aControlParam.setActivity(this);
>
> Of course the problem is that setActivity() takes an Activity and "this" is an
>ActivityBean. I can't cast it because ActivityBean does not truly implement
>Activity. Since the client knows nothing of the ActivityBean class, I can't change
>setActivity() to take an ActivityBean either. How should this be handled?
What about:
Acvitity self =
(Activity)javax.rmi.PortableRemoteObject.narrow(_context.getEJBObject());
aControlParam.setActivity(self);
or:
Acvitity self = (Activity)_context.getEJBObject();
aControlParam.setActivity(self);
if your server doesn't support the standard narrowing mechanism.
________________________________________________________________________________
Evan Ireland Sybase EA Server Engineering [EMAIL PROTECTED]
Wellington - New Zealand +64 4 934-5856
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