From f9cb5279429921e20f0a55e9046f8a78649aa8ad Mon Sep 17 00:00:00 2001 From: Mark McLoughlin Date: Fri, 16 Mar 2012 14:35:30 -0400 Subject: Add greenthread local storage model from nova Thread local storage is obviously a very useful facility to have available. Nova has a very simple API for this which uses eventlet's corolocal module and weakrefs. This looks to be generally useful and complete, so let's pull it into openstack-common. Change-Id: I52a08124297c9cb79def447436859bd8d2c0b622 --- openstack/common/local.py | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 openstack/common/local.py (limited to 'openstack') diff --git a/openstack/common/local.py b/openstack/common/local.py new file mode 100644 index 0000000..19d9627 --- /dev/null +++ b/openstack/common/local.py @@ -0,0 +1,37 @@ +# vim: tabstop=4 shiftwidth=4 softtabstop=4 + +# Copyright 2011 OpenStack LLC. +# All Rights Reserved. +# +# 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. + +"""Greenthread local storage of variables using weak references""" + +import weakref + +from eventlet import corolocal + + +class WeakLocal(corolocal.local): + def __getattribute__(self, attr): + rval = corolocal.local.__getattribute__(self, attr) + if rval: + rval = rval() + return rval + + def __setattr__(self, attr, value): + value = weakref.ref(value) + return corolocal.local.__setattr__(self, attr, value) + + +store = WeakLocal() -- cgit