Ian Bicking wrote:
> Geoffrey Talvola wrote:
>> I think I agree with you, Jason -- Webware should provide an easy
>> hook to swap in a subclass for a key class like Session and it
>> shouldn't feel like a hack. The Mixin stuff feels like too much of
>> a hack, and adding a bunch of hooks at specific places in the code
>> just adds clutter.
>>
>> Perhaps a setting in Application.Config could specify classes to use
>> in place of the standard classes:
>>
>> 'CustomClasses':
>> {
>> 'Session': 'MyPackage.MyModule:MySession' ,
>> 'Request': 'MyPackage.MyModule:MyRequest'
>> }
>
> I think this allows customizability, but not extensibility. It's
> customizable because you can alter the appserver without modifying the
> main source. But it's not extensible, because it can only be done
> once per installation for each main class.
Here's an idiom (completely untested) that allows you to easily do whatever
composing/extending you need. When you define your "enhanced" Session
class, make it available as a pure Mixin (without Session as a base class)
and also as a subclass of Session like this:
# MySession1.py
from WebKit.Session import Session
class MySession1Mixin(object):
def expiring(self):
super(MySession1Mixin, self).expiring(self)
#...
class MySession1(MySession1Mixin, Session):
pass
# MySession2.py
from WebKit.Session import Session
class MySession2Mixin(object):
def expiring(self):
super(MySession2Mixin, self).expiring(self)
#...
class MySession2(MySession2Mixin, Session):
pass
If you just want MySession1 or MySession2 you use it directly. But you can
combine the 2 mixins easily if needed:
# MySession1And2.py
from WebKit.Session import Session
from MySession1 import MySession1Mixin
from MySession2 import MySession2Mixin
class MySession1And2(MySession1Mixin, MySession2Mixin, Session):
pass
I think this would automatically call the expired methods of
MySession1Mixin, MySession2Mixin, and Session in sequence, if I understand
the "super" mechanism properly.
- Geoff
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