'Add tasks that need to be executed at a fixed interval.
Inheriting class overrides and then explicitly calls this method.'

def _add_looping_tasks(self):

    self.loopingcalls.add_task(self._delete_snapshots_marked_for_deletion, loopingcalls.ONE_MINUTE, loopingcalls.ONE_MINUTE)
    self.loopingcalls.add_task(self._handle_ems_logging, loopingcalls.ONE_HOUR)
