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 23 __metaclass__ = abc.ABCMeta 24 25 @abc.abstractmethod 26 def get(self, url): 27 """Gets the content from the memcache with a given key. 28 29 Args: 30 url: string, the key for the cache. 31 32 Returns: 33 object, the value in the cache for the given key, or None if the key is 34 not in the cache. 35 """ 36 raise NotImplementedError() 37 38 @abc.abstractmethod 39 def set(self, url, content): 40 """Sets the given key and content in the cache. 41 42 Args: 43 url: string, the key for the cache. 44 content: string, the discovery document. 45 """ 46 raise NotImplementedError() 47