def _watch(self):
"""Watch the service name on DBus."""
bus = DBus.get_connection()
num = bus.watch_name(self.service_name, DBUS_FLAG_NONE,
self._service_name_appeared_callback,
self._service_name_vanished_callback)
self._watched_id = num
def _unwatch(self):
"""Stop to watch the service name on DBus."""
bus = DBus.get_connection()
bus.unwatch_name(self._watched_id)
self._watched_id = None