OpenStack Study: cache.py

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# 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

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# 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

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# See the License for the specific language governing permissions and

# limitations under the License.

import fixtures

from keystone.common import cache

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class Cache(fixtures.Fixture):

"""A fixture for setting up and tearing down the cache between test cases.

"""

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    def setUp(self):

        # NOTE(dstanek):  We must remove the existing cache backend in the

        # setUp instead of the tearDown because it defaults to a no-op cache

        # and we want the configure call below to create the correct backend.

        # NOTE(morganfainberg):  The only way to reconfigure the CacheRegion

        # object on each setUp() call is to remove the .backend property.

        if hasattr(cache.REGION, 'backend'):

            del cache.REGION.backend

        # ensure the cache region instance is setup

        cache.configure_cache_region(cache.REGION)

        super(Cache, self).setUp()