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Class facotry

derekscruggs Posted: Thu Apr 07, 2005 6:54 am

Joined: 05 Apr 2005

Posts: 11

Class facotry

Hi All,

I`ve built an application framework on top of PHP Fusebox 3
(http://www.fusebox.org). Though Fusebox is procedural, most of what I do is
actually OO. I use this framework to build client applications quickly and
over time it`s matured to the point that I`m very productive with it.

I host all my clients` applications. They all have their own document roots,
but I use symlinks to have them all point to the same code base. The only
differences between clients are layout files and a per-client config file
that has various application-specific constants.

Now I`m at a point where I want to be able to dynamically load certain
classes based on which application is running. As a simple example, the
menuing system varies dramatically between clients beause they have their
own visual tastes. I use a Factory method to instanciate practically all of
my objects e.g.:

require_once(`Menu.php`);
$menu=Menu::Factory();

The underlying code looks something like this.

class Menu {
//in most cases Factory is inherited
function Factory() {
if(CLIENT=`client1`) {
require_once(`client1Menu.php`);
return new client1Menu;
} elseif (CLIENT=`client2`) {
require_once(`client2Menu.php`);
return new client1Menu;
} else {
return new Menu();
}
}
}

This works reasonably well, but being an architecture junkie I`d like to not
have to define the factory rules in code. Instead, I`d like a pure
algorithmic approach. As an example, have it look in a custom classes
directory for a file that has the same name as the current class plus some
client-specific string that can be expressed as a constant (i.e.
file_exists(CLIENTNAME . `classname.php`)).

Also, I`ve thought about using a monolitic factory for all objects. Just a
function called Factory() and all objects are instanciated from there. Is
that a common practice? Pros & cons?

Thanks!
-Derek

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