On Tue, Dec 13, 2011 at 5:10 PM, Vlad K. <[email protected]> wrote:
> > Hi all! > > In my Pyramid app I want to implement an event system, basically for > plugins to hook to various events that raise in the life of the > application. These events are each different, some allow one hook (by > raising an exception if another hook tries to register for same event), > some many, they handle various kinds of data, etc... My approach is the > following: > > > class SomeEvent(EventBase): > """Event raised in this or that condition, does X, requires Y, ...""" > HANDLERS = [] > > @classmethod > Register(cls, callable): > """Decorator that registers a handler for this event.""" > cls.HANDLERS.append(callable) > return callable > > def __init__(self, request): > self.request = request > ... > > def dispatch(self): > for h in self.HANDLERS: > h(self) > ... > > > @events.SomeEvent.Register > def some_handler(event): > ... > > > > > So basically we have a plugin with a handler some_handler, which we > register for the particular event via its decorator. Now, I don't want to > reinvent the wheel, and this approach seems rather straightforward, > unit-testable and simple to implement, plus the events are then > self-documenting. I was wondering if there is a better solution, or perhaps > I can reuse some part of the Pyramid framework? ZCL? > > Also, can I reuse Venusian to scan the plugins package and thus do "auto > import" of plugins at app startup time, instead of having the requirement > to manually import each plugin so that the decorators would trigger and > register the handlers (I really want the "plug and play" solution with > dropping a module in the plugins package dir and calling it done)? > > > Thanks. > > You can use: http://docs.pylonsproject.org/projects/pyramid/en/latest/api/events.html this is how you would create custom events: https://github.com/sontek/pyramid_signup/blob/master/pyramid_signup/events.py this is how you would fire the event: https://github.com/sontek/pyramid_signup/blob/master/pyramid_signup/views.py#L300 and this is how you would subscribe to the event: https://github.com/sontek/pyramid_signup/blob/master/pyramid_signup/tests/test_views.py#L387 -- You received this message because you are subscribed to the Google Groups "pylons-discuss" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/pylons-discuss?hl=en.
