--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/app/ranklist/common.py	Mon Mar 02 22:57:40 2009 +0000
@@ -0,0 +1,31 @@
+#!/usr/bin/python
+#
+# Copyright 2008 Google Inc.
+#
+# 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.
+
+"""Convenience functions.
+"""
+
+from google.appengine.api import datastore
+
+
+def transactional(operation):
+  """Decorator that wraps a method in a datastore transaction.
+
+  The method will be called through datastore.RunInTransaction, making the
+  operation atomic.
+  """
+  def transactional_operation(*args, **kwargs):
+    return datastore.RunInTransaction(operation, *args, **kwargs)
+  return transactional_operation