Hi All,
Happy New Year, etc :-)
Been working more on this stuff so finally have some more questions...
Philipp von Weitershausen wrote:
Okay, but where's this code? (ie: what .py should I look at for the
local registry implementation)
zope.app.component.site contains the LocalSiteManager class. This is the
persistent component registry used in Zope 3's standard ISites. It
inherits from zope.component.persistentregistry.PersistentComponents
which in turn inherits from zope.component.registry.Components. The
latter has the dynamic __bases__ property. You'll see that the setter
really just sets the __bases__ on its internal adapter and utility
registry. Both of those (sic!)
What does this "sic" mean?
are some sort of subclass of
zope.interface.adapter.BaseAdapterRegistry which has the handling for
cascading lookups through its __bases__ property.
Actually, it doesn't. The handling of __bases__ appears to be done in
the functions of the mysterious zope.interface.ro module.
(that ro thing takes the biscuit for obscure naming :-( )
Am I off base here? If so, more info please! :-)
Anyway, another question I have relates to the way in which registries
and sub registries are stacked up. Am I right in assuming the current
code is designed around a static setup of adapter registries which the
deeper registries cache the results of the registries higher up?
For what I'm after, I need to have a more dynamic buildup of
registrations based on which objects have been traversed through.
I can see two ways to approach this:
- stack the registries up during travesal in some way. I guess this
would be a variant of what's done now with current nested registries.
Is this feasible? Will there be performance problems?
- use one global registry and add/remove registrations during traversal
as necessary. How fast is registration/unregistration of adapters and
the like? How many adapter adds/removes at a traversal node would it
take to really slow things down?
I still feeling like I'm grasping a bit here but I hope you guys can help!
cheers,
Chris
--
Simplistix - Content Management, Zope & Python Consulting
- http://www.simplistix.co.uk
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