def send_barrier_request(self):
        parser = self.dp.ofproto_parser
        req = parser.OFPBarrierRequest(self.dp)
        return self.send_msg(req)
Retrieve all ansible groups.
dataset/ETHPy150Open osrg/ryu/ryu/tests/switch/tester.py/OpenFlowSw.send_barrier_request--crossover with--dataset/ETHPy150Open openstack/openstack-ansible/scripts/inventory-manage.py/get_all_groups