2 files changed, 90 insertions, 0 deletions
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()
diff --git a/tests/unit/test_local.py b/tests/unit/test_local.py
new file mode 100644
index 0000000..08e77af
--- /dev/null
+++ b/tests/unit/test_local.py
@@ -0,0 +1,53 @@
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+
+# Copyright 2012 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.
+
+import eventlet
+import unittest
+
+from openstack.common import local
+
+
+class Dict(dict):
+    """Make weak referencable object."""
+    pass
+
+
+class LocalStoreTestCase(unittest.TestCase):
+    v1 = Dict(a='1')
+    v2 = Dict(a='2')
+    v3 = Dict(a='3')
+
+    def test_thread_unique_storage(self):
+        """Make sure local store holds thread specific values."""
+        expected_set = []
+        local.store.a = self.v1
+
+        def do_something():
+            local.store.a = self.v2
+            expected_set.append(getattr(local.store, 'a'))
+
+        def do_something2():
+            local.store.a = self.v3
+            expected_set.append(getattr(local.store, 'a'))
+
+        eventlet.spawn(do_something).wait()
+        eventlet.spawn(do_something2).wait()
+        expected_set.append(getattr(local.store, 'a'))
+
+        self.assertTrue(self.v1 in expected_set)
+        self.assertTrue(self.v2 in expected_set)
+        self.assertTrue(self.v3 in expected_set)