Beefy Boxes and Bandwidth Generously Provided by pair Networks
The stupid question is the question not asked

Re: OO Design question: configuration

by rhesa (Vicar)
on May 19, 2007 at 16:36 UTC ( #616337=note: print w/replies, xml ) Need Help??

in reply to OO Design question: configuration

Some other options:
  1. Mixin/Role/Trait. Gives every object that needs it a config method.
  2. Config factory. This is a singleton itself, but it can hand out configuration objects to whoever requests it.

The mixin is conceptually very simple:

package My::ConfigMixin; use base qw/ Exporter /; our @EXPORT = qw/ config /; sub config { my $self = shift; somehow_get_config(@_); }
Which, when used (a simple use My::ConfigMixin; will do), gives your object the method config. Since its first param is your requesting object, you can do all sorts of filtering based on $self (access control, limiting output, etc).

The main issue here is maintaining state. Pretty much your only option is to use package variables in My::ConfigMixin, which can get messy. I'd be interested to learn more about Traits that need state, but sofar I'm a newbie on the subject.

The factory might be a better alternative: it can maintain state on its singleton instance.

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://616337]
[gnosti]: Corion: Thanks. Going to seconds, then back to H:M:S using strftime looks good.
[gnosti]: True, it's easy to go both ways ;-)
[marioroy]: kcott found the link.

How do I use this? | Other CB clients
Other Users?
Others taking refuge in the Monastery: (6)
As of 2017-08-18 09:07 GMT
Find Nodes?
    Voting Booth?
    Who is your favorite scientist and why?

    Results (297 votes). Check out past polls.