1 files changed, 49 insertions, 0 deletions
diff --git a/keystone-moon/keystone/common/cache/backends/noop.py b/keystone-moon/keystone/common/cache/backends/noop.py
new file mode 100644
index 00000000..38329c94
--- /dev/null
+++ b/keystone-moon/keystone/common/cache/backends/noop.py
@@ -0,0 +1,49 @@
+# 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
+
+
+NO_VALUE = api.NO_VALUE
+
+
+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