def tear_down(self):
        """ Called when controller is destroyed. """
        super(ReceiverController, self).tear_down()

        self.status = None
        self.launch_failure = None
        self.app_to_launch = None
        self.app_launch_event.clear()

        self._status_listeners[:] = []
def tear_down ( self ) : super ( ReceiverController , self ) . tear_down ( ) self . status = None self . launch_failure = None self . app_to_launch = None self . app_launch_event . clear ( ) self . _status_listeners [ : ] = [ ]
Called when controller is destroyed.