On Wednesday, July 2, 2003, at 02:32 PM, Pat Lightbody wrote:
I don't agree, and I haven't looked at CVS lately, but if the Action
interface is gone I'd like for it to be put back so that we can discuss this
more.
I think the mistake in your logic is that an action is a "just" a POJO. It's
NOT though, it's a POJO with a method called execute() that contains a
"stuff". That stuff is specifically put in the execute() method because that
object needs to be recognized as something more than "just" an object: it
HAS an execute() method, and therefore it IS an Action. This "is a" identity
has been used by OO for decades and there is no reason we should get rid of
it now.
The argument that making your object implement Action ties it to XWork is
dumb. So what if it is... even without it, having a method called execute()
ties it to XWork anyway. Even having support for any method (a la command
pattern), it is still tied to XWork because the action was written to
operate in certain ways (IoC pattern support, getters and setters, and
possible callouts to ActionContext).
Please don't underestimate the importance of compile-time checking. For some
things (validation, type coercion, web layers, etc) using runtime features
of the language is very nice. But I don't want everything to be runtime --
that's why I choose WebWork: it provides a nice balance between compile time
and runtime typing.
I vote a BIG -1 to removing the Action interface, I have yet to see a real
use case that would demonstrate the importance of doing this.
-Pat
----- Original Message ----- From: "Jason Carreira" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, July 02, 2003 11:16 AM Subject: RE: [OS-webwork] WebWork2, here I come!
This is a concern that Mike expressed as well, but I challenged him to
look at the code and see if it really makes sense. He looked, and
grudgingly agreed that it made sense to get rid of it, especially since
it took like 10 minutes and Gavin from Hibernate was there, talking
about how he'd removed the Peristable interface from Hibernate because
it was just useless.
Giving people a warm fuzzy feeling is not enough justification, IMO, to
needlessly tie Actions to Xwork, when they can really just be POJO's
with no-arg methods returning a String.
Jason
-----Original Message----- From: Hani Suleiman [mailto:[EMAIL PROTECTED] Sent: Wednesday, July 02, 2003 12:01 PM To: [EMAIL PROTECTED] Subject: Re: [OS-webwork] WebWork2, here I come!
I agree completely. All this 'just define it/figure it out at runtime' stuff really bothers me. Interfaces might be very 'old school' now, but they are useful, just so you know at compile time what contracts your components/classes/whatever are adhering to. I still have yet to look at xwork (waiting for migration guides+tools and performance reports), but the concept of having all information in an xml file and an active effort to remove type safety/contracts from code feels very wrong. I understand the allure of 'but you can use ANYTHING as an action!', but I do feel that those things that are used as an action should anticipate somewhat that they are one and will be treated as one, in most cases.
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