Quoting Joshua Chamas <[EMAIL PROTECTED]>:
> > Francesco Pasqualini wrote:
> >
> > an interesting feature of JSP is the possibility to use the MVC design
> pattern (INPUT/OUTPUT/LOGIC separation)
> > This is obtained with the "forward" instruction.
> > How the MVC design pattern can be implemented in the mod_perl (and
> specifically Apache::ASP) architecture ?
> >
>
> If you do use Apache::ASP in this way, how are you doing it.
> I don't know much about what you are going after, so it would
> be neat to hear how you accomplish it.
...mmh...
Developing an Apache::ASP application I encountered the problem/feature that it
is not possible to use global variables inside subs in a page.
For example:
page test.asp
$name='default name';
...
HelloWord();
sub HelloWord{
print $name; ## WRONG using global var is incosistent in mod_perl
}
The correct approach if you have sub in a asp Page is to pass it everything it
need:
page test.asp
$name='default name';
...
HelloWord($name);
sub HelloWord{
my $name = shift; #OK
print $name; ## OK $name is not global
}
To avoid passing many parameters to the subs I become using a $cx (cx stand for
context) global hash containig everything the subs needed, passed to each sub.
page test.asp
$cx = {};
$cx->{'name'} = 'default name';
$cx->{'age'} = 30;
...
HelloWord($cx);
...
sub HelloWord{
my $cx = shift;
my $name = $cx->{'name'}; #OK
print $name; ## OK $name is not global
}
...at the end of the work I realized that the idea of such a context is exactly
what it is used in MVC tools like:
- JSP templates,
- www.webmacro.org,
- jakarta.apache.org/velocity,
- www.freemarker.org.
But in such a way I've done a MVC architecture in a single page, where a part
of the page is the View and a part is the Controller(logic).
If Apache::ASP will support the 'forward' directive we could start developing
MVC application in a way similar to the JSP world.
Useful Links to MVC documentations are in:
http://jakarta.apache.org/velocity/ymtd/ymtd.html
JSP Specification:
http://java.sun.com/aboutJava/communityprocess/first/jsr053/jsp12.pdf
Francesco
>
> --Josh
>
> _________________________________________________________________
> Joshua Chamas Chamas Enterprises Inc.
> NodeWorks >> free web link monitoring Huntington Beach, CA USA
> http://www.nodeworks.com 1-714-625-4051
>
-----------------------------------------------------------
This mail sent through the IMP demo site: demo.horde.org
Find out more at http://www.horde.org/imp/
