[Zope3-Users] Questions about utility/service registration
srichter at cosmos.phy.tufts.edu
Fri Jan 28 08:44:13 EST 2005
On Friday 28 January 2005 04:11, Sven Schomaker wrote:
> I've got a question about the registration of local services/utilities
> at the
> SiteManagementFolder. The registration of services (e.g.) seems to be
> performed in the following manner:
> sm_folder = zapi.traverse(folder.getSiteManager(), "default")
> sm_folder['Utilities'] = LocalUtilityService()
> rm = sm_folder.getRegistrationManager()
> key =
> sm_folder['Utilities'], rm))
> zapi.traverse(rm, key).status = ActiveStatus
Note that you should not write your own services. Also, in Zope 3.1 all this
will go away. You might want to look and use the srichter-blow-services
branch (http://svn.zope.org/Zope3/branches/srichter-blow-services/) to see
how registration got simplified. Look in zope.app.component. There are many
documentation files documenting the new API.
> Now as I figured out from the registration package, there may
> multiple components under a given name which is handled by means of a
> registration stack.
Right, but this will be deprecated, so don't use it.
> Now that I add one component to the sm_folder and register it at the
> registration manager how would one register another version of that
> component, since the sm_folder will only accept one item for a given
> name and reassignment will raise a DuplicateError.
It is complicated. ;-)
> Would one only register the new version of the component at the rm
> without assigning it to the sm_folder.
Well, in the SM the components need to have different names, but in the
registration manager they can be both in the same stack. Note however, that
only one component at a time can be *active* in the stack. This was
originally implemented to support TTW package distribution.
> I wonder how the SiteManagementFolder and the registration stack are
> actually related and why one must both add the component to the
> SitemanagementFolder and to the RegistrationManager. So far I'm a bit
> stuck about this issue and would appreciate some help.
They are not related.
Anyways, don't go down this route, since it will not be there for long,
CBU Physics & Chemistry (B.S.) / Tufts Physics (Ph.D. student)
Web2k - Web Software Design, Development and Training
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