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observer2.py
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observer2.py
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__author__ = 'daokh'
__author__ = 'daokh'
from abc import ABCMeta, abstractmethod
class Sender(object):
def __init__(self):
self.events = dict()
def register(self, observer, event):
# Init the event with an empty list
if not self.events.has_key(event):
self.events[event] = list()
# Adding the observer for the event
self.events[event].append(observer)
def unregister(self, observer, event):
if self.events.has_key(event):
# Remove the observer for the event
if observer in self.events[event]:
self.events[event].remove(observer)
# Remove the event if its empty
if len(self.events[event]) == 0:
self.events.pop(event)
def update(self, event):
if self.events.has_key(event):
for observer in self.events[event]:
observer.notify(event)
class Observer(object):
__metaclass__ = ABCMeta
def __init__(self, name):
self.name = name
@abstractmethod
def notify(self, event):
raise NotImplementedError()
class MPObserver(Observer):
def notify(self, event):
print '-->{name} executing {event}'.format(name=self.name, event=event)
if __name__ == '__main__':
sender = Sender()
observer1 = MPObserver('observer1')
sender.register(observer1, 'event1')
sender.update('event1')
#observer1 = MPObserver('observer1')