74 lines
2.0 KiB
Python
74 lines
2.0 KiB
Python
# Copyright 2013 Metacloud, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Keystone In-Memory Dogpile.cache backend implementation."""
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import copy
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from dogpile.cache import api
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from oslo_log import versionutils
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NO_VALUE = api.NO_VALUE
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@versionutils.deprecated(
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versionutils.deprecated.OCATA,
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what='keystone.common.kvs.backends.MemoryBackend',
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remove_in=+1)
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class MemoryBackend(api.CacheBackend):
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"""A backend that uses a plain dictionary.
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There is no size management, and values which are placed into the
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dictionary will remain until explicitly removed. Note that Dogpile's
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expiration of items is based on timestamps and does not remove them from
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the cache.
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E.g.::
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from dogpile.cache import make_region
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region = make_region().configure(
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'keystone.common.kvs.Memory'
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)
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"""
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def __init__(self, arguments):
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self._db = {}
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def _isolate_value(self, value):
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if value is not NO_VALUE:
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return copy.deepcopy(value)
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return value
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def get(self, key):
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return self._isolate_value(self._db.get(key, NO_VALUE))
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def get_multi(self, keys):
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return [self.get(key) for key in keys]
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def set(self, key, value):
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self._db[key] = self._isolate_value(value)
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def set_multi(self, mapping):
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for key, value in mapping.items():
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self.set(key, value)
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def delete(self, key):
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self._db.pop(key, None)
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def delete_multi(self, keys):
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for key in keys:
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self.delete(key)
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