bddc7b19c7
Updates to the stable/grizzly version since "openstack.common.setup" has been replaced with "pbr" in later versions and this will require the conversion of setup.py before.
49 lines
1.7 KiB
Python
49 lines
1.7 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2011 OpenStack Foundation.
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# All Rights Reserved.
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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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"""Greenthread local storage of variables using weak references"""
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import weakref
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from eventlet import corolocal
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class WeakLocal(corolocal.local):
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def __getattribute__(self, attr):
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rval = corolocal.local.__getattribute__(self, attr)
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if rval:
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# NOTE(mikal): this bit is confusing. What is stored is a weak
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# reference, not the value itself. We therefore need to lookup
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# the weak reference and return the inner value here.
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rval = rval()
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return rval
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def __setattr__(self, attr, value):
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value = weakref.ref(value)
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return corolocal.local.__setattr__(self, attr, value)
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# NOTE(mikal): the name "store" should be deprecated in the future
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store = WeakLocal()
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# A "weak" store uses weak references and allows an object to fall out of scope
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# when it falls out of scope in the code that uses the thread local storage. A
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# "strong" store will hold a reference to the object so that it never falls out
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# of scope.
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weak_store = WeakLocal()
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strong_store = corolocal.local
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