Source code for lb.cache

# Copyright 2017 The Lambda-blocks developers. See AUTHORS for details.
#
# 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.

"""
Defines an abstract class for cache providers.
"""

import abc

class CacheProvider(abc.ABC):
    @abc.abstractmethod
    def set(self, key, value):
        """
        Adds the pair (key, value) to the cache.
        """
        return

    @abc.abstractmethod
    def get(self, key):
        """
        Gets the value associated to key in the cache.
        Raises KeyError if the key is not found.
        """
        return