Event system¶
Generic library provides generic.event
module which helps you implement
event systems in your application. By event system I mean an API for
subscribing for some types of events and to handle those events so previously
subscribed handlers are being executed.
Basic usage¶
First you need to describe event types you want to use in your application,
generic.event
dispatches events to corresponding handlers by inspecting
events’ types, so it’s natural to model those as classes:
>>> class CommentAdded(object):
... def __init__(self, post_id, comment):
... self.post_id = post_id
... self.comment = comment
Now you want to register handler for your event type:
>>> from generic.event import Manager
>>> manager = Manager()
>>> @manager.subscriber(CommentAdded)
... def print_comment(ev):
... print(f"Got new comment: {ev.comment}")
Then you just call generic.event.handle
function with CommentAdded
instance as its argument:
>>> manager.handle(CommentAdded(167, "Hello!"))
Got new comment: Hello!
This is how it works.