Merrill, Jason wrote:
I know there is probably no definite right or wrong answer here, and it depends on the
type of project, but I'm curious to get your opinion, if you're experienced with the MVC
pattern (not frameworks per se that use MVC, I know about, say, Commands in Cairngorm and
have checked into the Pure MVC architecture with its use of Notifications [though I only
partially understand the Façade - I do something similar I think in a class I call
"MVC"]- just interested in your opinions of raw MVC development).
My question is, in practice, when programming with the MVC design pattern, I
know the Model is usually completely decoupled from outside classes, but do you
usually completely decouple all other classes like views and controllers as
well, in favor of dispatching events? Therefore communication between MVC
classes are triggered completely by events (seems logical, but its also a heck
of a lot of event handling) or do you have some coupling going on (i.e. the
controller calls a method in the view telling it to change). Or do you follow
what some frameworks do and use Command classes with lots of event handling
going on?
Trying to find a good mix, I can see advantages and disadvantages both ways.
I'm doing a lot of event dispatching, but it seems a bit like overkill in some
cases and harder to manage than just calling public methods. Interested in how
you handle it when you use MVC pattern(s). Thanks,
The real point is that to call public methods, you have to know about
the object whose method you want to call and you need to know about the
method itself. When you broadcast an event, you don't need to know whose
listening, your just indicating that something meaningful has happenned
and perhaps also passing data that is meaningful.
Because of this you can build standalone components that don't need to
know everything about the world that surrounds them, so they can be
reused and also other people can look at them and understand how the
system fits together via the event system.
That said, for small systems I still sometimes use callbacks..
Paul
Jason Merrill
Bank of America Global Learning
Shared Services Solutions Development
Monthly meetings on the Adobe Flash platform for rich media experiences - join the Bank of America Flash Platform Community
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