RE: [platform-swt-dev] From Swing to SWT

[Scott Stanchfield <scott@xxxxxxxxxxxx>]

First, most client-side GUI apps are self contained; the UI and business
logic are on the same machine, so there's no wire trip needed.
Note that the BL could be talking across a wire for other reasons, but
it's "normal" to install or send the UI and BL for a GUI app.

However, who said the business logic in a GUI app has to be (completely)
on the server side? You can design an app that way, but you can also
split the business logic, setting up the validation parts in the BL
client-side, while the "do it" parts are server-side.

Distributed applications don't have to be distributed on UI/Buiness
Logic/Data Management bounds...

Either way, field-level validation is what I'm talking about, and my
point is that you need to separate it from the UI so you can have
alternate UIs... The BL will stay the same, but may need slight
refactoring if you want to split it. It would still work with any UI.

-- Scott

> -----Original Message-----
> From: platform-swt-dev-admin@xxxxxxxxxxx
> [mailto:platform-swt-dev-admin@xxxxxxxxxxx]On Behalf Of Brad O'Hearne
> Sent: Sunday, January 19, 2003 9:35 PM
> To: platform-swt-dev@xxxxxxxxxxx
> Subject: RE: [platform-swt-dev] From Swing to SWT
>
>
> > That depends...
> >
> > I feel *very strongly* that validation should be done either
> > only in the business logic, *or* it must be redone in the
> > business logic.
>
> Yes, completely agreed (and was what I originally intended
> :-).  It must
> necessarily always be validated server-side, regardless of
> what is done
> client-side.  But with rich-GUI apps, (as opposed to stateless web
> interfaces) you often want field-level validation (rather than
> form-level validation).  If this is a requirement, you either have to
> put this logic inside the client-side GUI, or make a trip across the
> wire as you tab from field to field (which is insane).  But
> regardless,
> the data must be revalidated on the server-side prior to persistence.
>
>
>
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