323         """called on server stop event to properly close opened sessions and

   323         """called on server stop event to properly close opened sessions and

   324         connections

   324         connections

   325         """

   325         """

   326         assert not self._shutting_down, 'already shutting down'

   326         assert not self._shutting_down, 'already shutting down'

   327         self._shutting_down = True

   327         self._shutting_down = True

   328         if isinstance(self._looping_tasks, tuple): # if tasks have been started

   329         if isinstance(self._looping_tasks, tuple): # if tasks have been started

   329             for looptask in self._looping_tasks:

   330             for looptask in self._looping_tasks:

   330                 self.info('canceling task %s...', looptask.name)

   331                 self.info('canceling task %s...', looptask.name)

   331                 looptask.cancel()

   332                 looptask.cancel()

   332                 looptask.join()

   333                 looptask.join()