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  # Copyright 2012 OpenStack Foundation.
  # 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.
  
  import abc
  
  from quantum.api import extensions
  
  
  class ServicePluginBase(extensions.PluginInterface):
      """Define base interface for any Advanced Service plugin."""
      __metaclass__ = abc.ABCMeta
      supported_extension_aliases = []
  
      @abc.abstractmethod
      def get_plugin_type(self):
          """Return one of predefined service types.
  
          See quantum/plugins/common/constants.py
          """
          pass
  
      @abc.abstractmethod
      def get_plugin_name(self):
          """Return a symbolic name for the plugin.
  
          Each service plugin should have a symbolic name. This name
          will be used, for instance, by service definitions in service types
          """
          pass
  
      @abc.abstractmethod
      def get_plugin_description(self):
          """Return string description of the plugin."""
          pass
  