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# Copyright 2013 Metacloud
#
# 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.
from dogpile.cache import api
from oslo_log import versionutils
NO_VALUE = api.NO_VALUE
@versionutils.deprecated(
versionutils.deprecated.MITAKA,
what='keystone.common.cache.noop backend',
in_favor_of="dogpile.cache's Null backend",
remove_in=+1)
class NoopCacheBackend(api.CacheBackend):
"""A no op backend as a default caching backend.
The no op backend is provided as the default caching backend for keystone
to ensure that ``dogpile.cache.memory`` is not used in any real-world
circumstances unintentionally. ``dogpile.cache.memory`` does not have a
mechanism to cleanup it's internal dict and therefore could cause run-away
memory utilization.
"""
def __init__(self, *args):
return
def get(self, key):
return NO_VALUE
def get_multi(self, keys):
return [NO_VALUE for x in keys]
def set(self, key, value):
return
def set_multi(self, mapping):
return
def delete(self, key):
return
def delete_multi(self, keys):
return
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