Real globals inside a module

[Christoph Haas]

On Sun, May 13, 2007 at 11:41:12AM +0200, Jorgen Bodde wrote:
> I am wrestling with some architecture inside my app. Let's say I have
> a tunings collection, which contains e.g. 23 types of guitar tunings.
> In my song object I want to restore a relation between one of the
> tuning objects inside the tunings module.
> 
> I already figured out I need somethign like a global collection inside
> the tunings module,. but how global is it? When I am inside my app
> object, and import the tunings module, can I access the same global
> class as when I am inside my songs module and load the tunings module?

You are on the right way. If you import the same module a second time in
another place of your application you get access to the exact same data.
That is called a "singleton". I often use such a singleton for global
configuration data.

> So basically I want to access the same global list in both modules,
> but not re-create the list in every module since it should be restored
> by the database layer once.

Import your global module and just run the initalisation once. That
should do it.

> Thanks for any advice, I do not want to make a global manager object
> that I need to pass around all the time, that would be silly..

Indeed. That would suck.

 Christoph