5881ad7cb1
Using oslo_cache lib the only way to compare some cached_value with NO_VALUE is to add bad import like 'from oslo_cache.backends.dictionary import NO_VALUE'. NO_VALUE is now added to core.py file and the improved import 'oslo_cache.core import NO_VALUE' will look much better in other projects. NO_VALUE is now public, it is added to __all__ and is used everywhere from core instead of dogpile.cache.api.NO_VALUE. Co-Authored-By: Sergey Nikitin <snikitin@mirantis.com> Change-Id: I8fea4a9eb088089289ba1dd35377fb10465c313a
55 lines
1.5 KiB
Python
55 lines
1.5 KiB
Python
# Copyright 2013 Metacloud
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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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from dogpile.cache import api
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from oslo_cache import core
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__all__ = [
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'NoopCacheBackend'
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]
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_NO_VALUE = core.NO_VALUE
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class NoopCacheBackend(api.CacheBackend):
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"""A no op backend as a default caching backend.
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The no op backend is provided as the default caching backend for keystone
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to ensure that ``dogpile.cache.memory`` is not used in any real-world
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circumstances unintentionally. ``dogpile.cache.memory`` does not have a
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mechanism to cleanup it's internal dict and therefore could cause run-away
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memory utilization.
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"""
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def __init__(self, *args):
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return
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def get(self, key):
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return _NO_VALUE
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def get_multi(self, keys):
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return [_NO_VALUE for x in keys]
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def set(self, key, value):
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return
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def set_multi(self, mapping):
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return
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def delete(self, key):
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return
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def delete_multi(self, keys):
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return
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