Steve Muench wrote:
> Quick follow-up question on your Swing<-->EJB architecture...
>
> Do you bind your Swing forms to Collections of Value Objects
> or to remote Entity Beans ?
We use stateful session beans for most use cases where editing of data occurs.
Those stateful session beans interact with entity beans. We use value objects to
hold the actual data.
>
> If you're showing information on a Swing form like this:
>
> Name: [Steve ]
> Level: [Silver ][v] (supposed to look like a poplist) :-)
> CreditLimit: [1000 ]
> :
> lots more info here
> :
>
> and suppose the user pulls the poplist and sets the
> customer level to [Platinum] and does "File / Save"...
>
> Assuming you're EJB-tier business logic has code that
> says,
>
> :
> if (getLevel().equals("Platinum")) {
> setCreditLimit(9000);
> }
>
Well, it's sort of like that ;-) Actually, the choice list consists of a list of
objects with the attributes description and value. The persistence layer used by
the entity beans detects the change in creditLimit during the update.
>
> Does your user still see the now stale CreditLimit of 1000 on
> the Swing form, or do you implement some kind of "Value Messenger"
> pattern that communicates middle-tier data changes back to
> the collection of value objects in the Swing thin client?
The stateful session bean returns the saved state back to the client after a
successful save. Infobus handles notifying all interested client data models of an
update.
>
> Just curious how you handle this issue in your app.
We're adding JMS notification to notify other clients of a change as well.
We built a fairly extensive framework for creating client applications that handle
complex data. We have talked about releasing it as open source, but we're a little
behind in getting main product releases out.
> _____________________________________________________________________
> Steve Muench - Developer, Product Manager, XML Evangelist, Author
> "Building Oracle XML Applications" - www.oreilly.com/catalog/orxmlapp
-- Victor
-------------------------------------------------
"I've figured out the difference between scientific
knowledge and business knowledge. Scientific knowledge
depends on facts, logic, and the rigorous testing of ideas
in the laboratory and the field. Business knowledge
depends on the assertion of pet biases with great
confidence and exorbitant billing rates." --Bob Lewis
===========================================================================
To unsubscribe, send email to [EMAIL PROTECTED] and include in the body
of the message "signoff EJB-INTEREST". For general help, send email to
[EMAIL PROTECTED] and include in the body of the message "help".
