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OpenStack Study: inmemdb.py**** CubicPower OpenStack Study ****
# Copyright 2013 Metacloud, Inc. # # 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. """ Keystone In-Memory Dogpile.cache backend implementation. """ import copy from dogpile.cache import api NO_VALUE = api.NO_VALUE
**** CubicPower OpenStack Study **** class MemoryBackend(api.CacheBackend): """A backend that uses a plain dictionary. There is no size management, and values which are placed into the dictionary will remain until explicitly removed. Note that Dogpile's expiration of items is based on timestamps and does not remove them from the cache. E.g.:: from dogpile.cache import make_region region = make_region().configure( 'keystone.common.kvs.Memory' ) """
**** CubicPower OpenStack Study **** def __init__(self, arguments): self._db = {}
**** CubicPower OpenStack Study **** def _isolate_value(self, value): if value is not NO_VALUE: return copy.deepcopy(value) return value
**** CubicPower OpenStack Study **** def get(self, key): return self._isolate_value(self._db.get(key, NO_VALUE))
**** CubicPower OpenStack Study **** def get_multi(self, keys): return [self.get(key) for key in keys]
**** CubicPower OpenStack Study **** def set(self, key, value): self._db[key] = self._isolate_value(value)
**** CubicPower OpenStack Study **** def set_multi(self, mapping): for key, value in mapping.items(): self.set(key, value)
**** CubicPower OpenStack Study **** def delete(self, key): self._db.pop(key, None)
**** CubicPower OpenStack Study **** def delete_multi(self, keys): for key in keys: self.delete(key)
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