On December 2, 2009, Gary Poster wrote: > On Dec 2, 2009, at 12:47 PM, Francis J. Lacoste wrote: > > On December 2, 2009, Gary Poster wrote: > >> On Dec 2, 2009, at 11:41 AM, Muharem Hrnjadovic wrote: > >>> Gary Poster wrote: > >>>> On Dec 2, 2009, at 10:41 AM, Muharem Hrnjadovic wrote: > >>>>> Quick question: > >>>>> > >>>>> do we use the zope class registry anywhere? > >>>> > >>>> I doubt it. > >>>> > >>>>> Is it safe to use within > >>>>> Launchpad? > >>>> > >>>> I'd prefer to use utility registration if that can work with your use > >>>> case. > >>> > >>> Sorry for not being precise enough. In my particular case a number of > >>> classes would implement the interface in question (IBuildFarmJob). > >>> > >>> I understood the utility registration mechanism requires that there is > >>> exactly one class that implements a particular interface in which case > >>> I could not use it for the interface/purpose at hand. > >> > >> The class registry you showed had keys and values. > >> > >> You can register different utilities for the same interface by providing > >> a different name for each one (I think of this as a namespace). > >> > >> You can then get all of the utilities for that interface with > > > > getUtilitiesFor. From docs: > >>>>> sorted(components.getUtilitiesFor(tests.I2)) > >> > >> [(u'', U12(2)), (u'three', U12(3))] > >> > >> In that example, ``components`` could be obtained as follows: > >> > >> from zope.component import getSiteManager > >> components = getSiteManager() > > > > Another possibility is to use subscriptions. You can register components > > for the IBuildFarmJob interface and get all the registered subscribers. > > Absolutely. > > FWIW, I don't like subscription adapters because their functionality can be > essentially duplicated in the way I described, with named utilities. I'm > trying to reduce the number of things to learn about in Zope's Component > Architecture in zope-dev. So I don't recommend them...but that's just me. > :-)
Then what Gary says :-) -- Francis J. Lacoste [email protected]
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