zope.component.getGlobalSiteManager
The API returns the module-scope global registry:
>>> from zope.interface.interfaces import IComponentLookup >>> from zope.component.globalregistry import base >>> from zope.component import getGlobalSiteManager >>> gsm = getGlobalSiteManager() >>> gsm is base True
The registry implements the ~zope.component.interfaces.IComponentLookup interface:
>>> IComponentLookup.providedBy(gsm) True
The same registry is returned each time we call the function:
>>> getGlobalSiteManager() is gsm True
zope.component.getSiteManager(context=None)
We don't know anything about the default service manager, except that it is an IComponentLookup.
>>> from zope.component import getSiteManager >>> from zope.interface.interfaces import IComponentLookup >>> IComponentLookup.providedBy(getSiteManager()) True
Calling getSiteManager() with no args is equivalent to calling it with a context of None.
>>> getSiteManager() is getSiteManager(None) True
If the context passed to getSiteManager() is not None, it is adapted to IComponentLookup and this adapter returned. So, we create a context that can be adapted to IComponentLookup using the __conform__ API.
Let's create the simplest stub-implementation of a site manager possible:
>>> sitemanager = object()
Now create a context that knows how to adapt to our newly created site manager.
>>> from zope.component.tests.examples import ConformsToIComponentLookup >>> context = ConformsToIComponentLookup(sitemanager)
Now make sure that the getSiteManager() API call returns the correct site manager.
>>> getSiteManager(context) is sitemanager True
Using a context that is not adaptable to IComponentLookup should fail.
>>> getSiteManager(sitemanager) Traceback (most recent call last): ... ComponentLookupError: ('Could not adapt', <instance Ob>, <InterfaceClass zope...interfaces.IComponentLookup>)