def publish(self, event):
"""
Publishes an event to subscribers.
"""
if not IEvent.providedBy(event):
raise BusError('Invalid dispatching, event should provide IEvent')
# Dispatches event to subscribers
if self.subscribers.has_key(type(event)):
for subscriber in self.subscribers[type(event)]:
subscriber(event)
# Publishes event on connected buses
for follower in self.followers:
follower.publish(event)
