Stephan Richter wrote:
> On Thursday 08 April 2010, Martin Aspeli wrote:
>> Can you elaborate on what you mean here?
>
> So I think this can all be done independently of base registry (unless you are
> are planning to store the registry in the ZODB).
>
> The key for layering is the ability to inherit components using the __bases__
> attribute (see registry.py). So something like:
>
> reg1 = Components('reg1') # Registry for layer 1
>
> Then for the next layer that is based on layer 1, you can do:
>
> reg2 = Components('reg2', (reg1,)) # Registry for layer 2
>
> This should behave identically to how ZODB storage layering works.

Right. However, any calls to provideAdapter() and friends would still 
use the global registry, unless I monkey patch 
zope.component.globalregistry.base, as would any ZCML directives, I guess.

Martin

-- 
Author of `Professional Plone Development`, a book for developers who
want to work with Plone. See http://martinaspeli.net/plone-book

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