Merge "Add NoOp dogpile cache backend"

heat/common/cache/backends/noop.py

@@ -0,0 +1,48 @@
+#
+#    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 heat
+    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

requirements-py3.txt

@@ -4,6 +4,7 @@
 
 pbr>=0.11,<2.0
 Babel>=1.3
+dogpile.cache>=0.5.3
 eventlet>=0.17.3
 greenlet>=0.3.2
 httplib2>=0.7.5

requirements.txt

@@ -4,6 +4,7 @@
 
 pbr>=0.11,<2.0
 Babel>=1.3
+dogpile.cache>=0.5.3
 eventlet>=0.17.3
 greenlet>=0.3.2
 httplib2>=0.7.5