old_contents: # vim: tabstop=4 shiftwidth=4 softtabstop=4
  
  # Copyright 2010 United States Government as represented by the
  # Administrator of the National Aeronautics and Space Administration.
  # 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.
  
  
  from nova.utils import load_module
  from nova.rpc_backends.common import RemoteError, LOG
  from nova import flags
  
  FLAGS = flags.FLAGS
  flags.DEFINE_string('rpc_backend',
                      'nova.rpc_backends.amqp',
                      "The messaging module to use, defaults to AMQP.")
  
  RPCIMPL = load_module(FLAGS.rpc_backend)
  
  
  def create_connection(new=True):
      return RPCIMPL.Connection.instance(new=True)
  
  
  def create_consumer(conn, topic, proxy, fanout=False):
      if fanout:
          return RPCIMPL.FanoutAdapterConsumer(
                  connection=conn,
                  topic=topic,
                  proxy=proxy)
      else:
          return RPCIMPL.TopicAdapterConsumer(
                  connection=conn,
                  topic=topic,
                  proxy=proxy)
  
  
  def create_consumer_set(conn, consumers):
      return RPCIMPL.ConsumerSet(connection=conn, consumer_list=consumers)
  
  
  def call(context, topic, msg):
      return RPCIMPL.call(context, topic, msg)
  
  
  def cast(context, topic, msg):
      return RPCIMPL.cast(context, topic, msg)
  
  
  def fanout_cast(context, topic, msg):
      return RPCIMPL.fanout_cast(context, topic, msg)
  
  
  def multicall(context, topic, msg):
      return RPCIMPL.multicall(context, topic, msg)
  
new_contents: # vim: tabstop=4 shiftwidth=4 softtabstop=4
  
  # Copyright 2010 United States Government as represented by the
  # Administrator of the National Aeronautics and Space Administration.
  # 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.
  
  
  from nova.utils import import_object
  from nova.rpc_backends.common import RemoteError, LOG
  from nova import flags
  
  FLAGS = flags.FLAGS
  flags.DEFINE_string('rpc_backend',
                      'nova.rpc_backends.amqp',
                      "The messaging module to use, defaults to AMQP.")
  
  RPCIMPL = import_object(FLAGS.rpc_backend)
  
  
  def create_connection(new=True):
      return RPCIMPL.Connection.instance(new=True)
  
  
  def create_consumer(conn, topic, proxy, fanout=False):
      if fanout:
          return RPCIMPL.FanoutAdapterConsumer(
                  connection=conn,
                  topic=topic,
                  proxy=proxy)
      else:
          return RPCIMPL.TopicAdapterConsumer(
                  connection=conn,
                  topic=topic,
                  proxy=proxy)
  
  
  def create_consumer_set(conn, consumers):
      return RPCIMPL.ConsumerSet(connection=conn, consumer_list=consumers)
  
  
  def call(context, topic, msg):
      return RPCIMPL.call(context, topic, msg)
  
  
  def cast(context, topic, msg):
      return RPCIMPL.cast(context, topic, msg)
  
  
  def fanout_cast(context, topic, msg):
      return RPCIMPL.fanout_cast(context, topic, msg)
  
  
  def multicall(context, topic, msg):
      return RPCIMPL.multicall(context, topic, msg)
  
subject: Use the util.import_object to import a module.