| Server IP : 49.231.201.246 / Your IP : 216.73.216.149 Web Server : Apache/2.4.18 (Ubuntu) System : Linux 246 4.4.0-210-generic #242-Ubuntu SMP Fri Apr 16 09:57:56 UTC 2021 x86_64 User : root ( 0) PHP Version : 7.0.33-0ubuntu0.16.04.16 Disable Function : exec,passthru,shell_exec,system,proc_open,popen,pcntl_exec MySQL : OFF | cURL : ON | WGET : ON | Perl : ON | Python : ON | Sudo : ON | Pkexec : ON Directory : /usr/lib/python3/dist-packages/zope/event/ |
Upload File : |
"""Class-based event handlers
A light-weight event-handler framework based on event classes.
Handlers are registered for event classes:
>>> import zope.event.classhandler
>>> class MyEvent(object):
... def __repr__(self):
... return self.__class__.__name__
>>> def handler1(event):
... print("handler1 %r" % event)
>>> zope.event.classhandler.handler(MyEvent, handler1)
Descriptor syntax:
>>> @zope.event.classhandler.handler(MyEvent)
... def handler2(event):
... print("handler2 %r" % event)
>>> class MySubEvent(MyEvent):
... pass
>>> @zope.event.classhandler.handler(MySubEvent)
... def handler3(event):
... print("handler3 %r" % event)
Subscribers are called in class method-resolution order, so only
new-style event classes are supported, and then by order of registry.
>>> import zope.event
>>> zope.event.notify(MySubEvent())
handler3 MySubEvent
handler1 MySubEvent
handler2 MySubEvent
"""
import zope.event
registry = {}
def handler(event_class, handler_=None, decorator=False):
"""Define an event handler for a (new-style) class.
This can be called with a class and a handler, or with just a
class and the result used as a handler decorator.
"""
if handler_ is None:
return lambda func: handler(event_class, func, True)
if not registry:
zope.event.subscribers.append(dispatch)
if event_class not in registry:
registry[event_class] = [handler_]
else:
registry[event_class].append(handler_)
if decorator:
return handler
def dispatch(event):
for event_class in event.__class__.__mro__:
for handler in registry.get(event_class, ()):
handler(event)