Hi Tamer. 2013/5/14 Tamer Higazi <[email protected]>
> 1. What is the difference between a global and a localSiteManager from > the zope.component package?! How does it How do I have to understand > that a "globalSiteManager" is in memory, and a localSiteManager is > persistent ?! > "SiteManager" is a deprecated term and now is replaced by "registry". A registry can perform registrations of adapters and utilities (components in short). Look at the interface in zope.interface.interfaces.IComponents and you will see a standard registry interface (earlier this interface was in zope.component but as of zope.interface-3.8 it migrated). SiteManager is an implementation of this interface. *Zope has a* *more complex lookup process* for components. It can provide several registries. They are known as SiteManagers. If you just start a python process and import the zope.component package it will have 1 registry in memory (the globalSiteManager or global registry). When you issue a getAdapter call it will find that registry and ask it for the adapter. The localSiteManager is a *hooked* registry (it is persistent by default in BlueBream within the ZODB). If it is present the upper adapter lookup process will *ask the local registry for an adapter and only if it does not provide it will it ask the global one*. In bluebream you can provide several localSiteManagers in witch case the lookup will be processed through all of them up to the global one. 2013/5/14 Tamer Higazi <[email protected]> > > 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?! > Both are based on the same adapters registries, but the have different concept and usage. *Adapter* is a wrap around some object to provide some specific interface. So basicly adapting means getting a specific interface for managing *one or many objects*. *Utility* is an object that provides the interface and does not wrap anything. When you lookup utilities, you *do not provide any objects* that will be managed by it. Hope this helps. Taras 2013/5/14 Tamer Higazi <[email protected]> > Hi people! > I have worked out so far the ZCA tutorial, and there are certain things > for me not clear. > > 1. What is the difference between a global and a localSiteManager from > the zope.component package?! How does it How do I have to understand > that a "globalSiteManager" is in memory, and a localSiteManager is > persistent ?! > > Could somebody of you explain it to me?! > > > 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?! > > > > For answering my questions, I would kindly thank you. > > > > > Tamer > _______________________________________________ > bluebream mailing list > [email protected] > https://mail.zope.org/mailman/listinfo/bluebream >
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