1# Copyright 2014 Google Inc. All Rights Reserved. 2# 3# Licensed under the Apache License, Version 2.0 (the "License"); 4# you may not use this file except in compliance with the License. 5# You may obtain a copy of the License at 6# 7# http://www.apache.org/licenses/LICENSE-2.0 8# 9# Unless required by applicable law or agreed to in writing, software 10# distributed under the License is distributed on an "AS IS" BASIS, 11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12# See the License for the specific language governing permissions and 13# limitations under the License. 14 15"""An abstract class for caching the discovery document.""" 16 17import abc 18 19 20class Cache(object): 21 """A base abstract cache class.""" 22 __metaclass__ = abc.ABCMeta 23 24 @abc.abstractmethod 25 def get(self, url): 26 """Gets the content from the memcache with a given key. 27 28 Args: 29 url: string, the key for the cache. 30 31 Returns: 32 object, the value in the cache for the given key, or None if the key is 33 not in the cache. 34 """ 35 raise NotImplementedError() 36 37 @abc.abstractmethod 38 def set(self, url, content): 39 """Sets the given key and content in the cache. 40 41 Args: 42 url: string, the key for the cache. 43 content: string, the discovery document. 44 """ 45 raise NotImplementedError() 46