Hi, Le Tue, 14 May 2013 06:55:38 +0200, Tamer Higazi <th982a@googlemail.com> a écrit:
1. What is the difference between a global and a localSiteManager from the zope.component package?!
How do I have to understand that a "globalSiteManager" resists in memory, and a localSiteManager is persistent ?!
Could somebody of you explain it to me?!
Yes, there are two kinds of complementary "registries" (or "site managers"): - a global one, mainly build by ZCML (or "static") declarations - a local one, which is made of persistent components registered into the ZODB. Local components are "contextual", so are only available (by default) to objects "attached" to the site manager inside which these components are defined. This registry is mainly specific to Zope applications so if you build a ZCA-based application outside of Zope, you will probably don't have a local registry. Where you are looking for a component, search is made at first in the local registry, then in the global one.
2. What is the difference between an adapter and a utility ?! I register an adapter as well the same way as I do with a utility, and I query those 2 as well. But what's the point there?!
A utility is a simple named component which provides an interface; it's generally a singleton. An adapter, on the opposite, takes one or more objects arguments (each providing a given interface) to return an object providing another interface. Regards, Thierry P.S.: please avoid cross-posts!