On 12/05/2011 09:51 AM, Olemis Lang wrote:
On Mon, Dec 5, 2011 at 9:37 AM, Chris Nelson<[email protected]> wrote:
On 12/05/2011 09:06 AM, Olemis Lang wrote:
On Mon, Dec 5, 2011 at 7:57 AM, Chris Nelson<[email protected]> wrote:
I think you are missing the point here that ExtensionOption offers a
way to instantiate Components by relying on Python descriptors magic .
Hence that's not the way to go if you want to list the entries under
[components] section in trac.ini . I mentioned before you have
basically two ways to go :
- Use `env.config` object so as to read information in trac.ini file directly
- Use `ComponentMeta._registry` to list the classes implementing a
given interface
(review the code for `ExtensionPoint.extensions` method for further details
;)
and then invoke `ComponentManager.is_component_enabled` so as to
know whether that particular class is enabled/disabled in that particular
Trac environment.
I understand there are several ways to do this. If I wanted multiple listeners
or processors or whatever, I could use an ExtensionPoint and iterate over all
the enabled implementations. But what I want is a configurable single handler.
I believe that the way to do that is an ExtensionOption. I've used that
successfully for functions in my own plugin but when I try to instantiate an
implementation in another plugin, it fails.
The class TeamCalendar is implemented in the module calendar.py in the plugin
teamcalendar but when I pass "teamcalendar.calendar.TeamCalendar' to
ExtensionOption, it fails to find the class.
Cannot find an implementation of the "IResourceCalendar" interface
named "teamcalendar.calendar.TeamCalendar". Please update the
option TracPM.calendar in trac.ini.
How can I find the real name of the class?
In that case you should use trac.config.ExtensionOption descriptors ,
rather than defining extension points
;)
I'm not using an ExtensionPoint. I mention that only because I
understand that is a way to have pluggable interfaces. I don't know
what a "trac.config.ExtensionOption descriptor" is.
My trac.ini says:
[TracPM]
...
calendar = teamcalendar.calendar.TeamCalendar
and my code says:
cal = ExtensionOption('TracPM', 'calendar',
IResourceCalendar, 'SimpleCalendar')
and I see:
Cannot find an implementation of the "IResourceCalendar" interface
named "teamcalendar.calendar.TeamCalendar". Please update the
option TracPM.calendar in trac.ini.
If I remove the trac.ini entry, and change the code to:
cal = ExtensionOption('TracPM', 'calendar',
IResourceCalendar,
'teamcalendar.calendar.TeamCalendar')
I get the same error.
If I try to import teamcalendar.calendar.TeamCalendar into
tracjsgantt/tracpm.py and change to:
cal = TeamCalendar(self.env)
TracJSGantt won't even load. The page says:
No macro or processor named 'TracJSGanttChart' found
and my trac.log says:
2011-12-05 11:14:14,029 Trac[loader] ERROR: Skipping "tracjsgantt =
tracjsgantt": (can't import "ImportError: cannot import name
IResourceCalendar")
I don't know what's missing!
Chris
--
Christopher Nelson, Software Engineering Manager
SIXNET - Solutions for Your Industrial Networking Challenges
331 Ushers Road, Ballston Lake, NY 12019
Tel: +1.518.877.5173, Fax: +1.518.877.8346 www.sixnet.com
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