code: def notify(self, correlation_id, event, value):
          
          e = self.find_event(event)
          if e != None:
              e.notify(correlation_id, value)
docs: Fires event specified by its name and notifies all registered
          IEventListener listeners
  
          :param correlation_id: (optional) transaction id to trace execution through call chain.
  
          :param event: the name of the event that is to be fired.
  
          :param value: the event arguments (parameters).