new_contents: # Copyright (c) 2016 NEC Corporation. All rights reserved.
  #
  #    Licensed under the Apache License, Version 2.0 (the "License"); you may
  #    not use this file except in compliance with the License. You may obtain
  #    a copy of the License at
  #
  #         http://www.apache.org/licenses/LICENSE-2.0
  #
  #    Unless required by applicable law or agreed to in writing, software
  #    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  #    License for the specific language governing permissions and limitations
  #    under the License.
  #
  
  """ Base class for all API models."""
  
  from __future__ import absolute_import
  
  from oslo_config import cfg
  
  # Use new deepsix when appropriate
  if cfg.CONF.distributed_architecture:
      from congress.dse2 import deepsix2 as deepsix
  else:
      from congress.dse import deepsix
  from congress import exception
  
  
  class APIModel(deepsix.deepSix):
      """Base Class for handling API requests."""
  
      def __init__(self, name, keys='', inbox=None, dataPath=None,
                   policy_engine=None, datasource_mgr=None):
          super(APIModel, self).__init__(name, keys, inbox=inbox,
                                         dataPath=dataPath)
          self.engine = policy_engine
          self.datasource_mgr = datasource_mgr
          self.distributed_architecture = cfg.CONF.distributed_architecture
  
      def invoke_rpc(self, caller, name, kwargs):
          if self.distributed_architecture:
              return self.rpc(caller, name, kwargs)
          else:
              func = getattr(caller, name, None)
              if func:
                  return func(**kwargs)
              raise exception.CongressException('method: %s is not defined in %s'
                                                % (name, caller.__name__))
  
subject: Move common functionalities to base APIModel