On Tue, Dec 1, 2009 at 16:28, Martijn Faassen <faassen@startifact.com> wrote:
* abstract factory not called on an object ("utility factory", "null-adaptation")
In: the requested interface
Process: look up factory. Call factory.
Out: a new instance that provides the requested interface
When would you need this? As I understand it, the only difference from the normal utility lookup is that you don't get singletons. IMO that breaks the concept of what a utility is, so null-adaption is a better name for that, but that still means you adapt nothing, so it's not an adapter either. :-)
* abstract instance retrieval for an object ("utility associated with an instance", "adapting to an existing instance")
In: the requested interface, one or more instances.
Process: look up instance with input instances as "context".
Out: a previously registered instance that provides the requested interface
Hmm. Singleton adapters, in other words. I can see that as useful, sure. -- Lennart Regebro: Python, Zope, Plone, Grok http://regebro.wordpress.com/ +33 661 58 14 64