app/ranklist/common.py

   1 #!/usr/bin/python
   2 #
   3 # Copyright 2008 Google Inc.
   4 #
   5 # Licensed under the Apache License, Version 2.0 (the "License");
   6 # you may not use this file except in compliance with the License.
   7 # You may obtain a copy of the License at
   8 #
   9 #      http://www.apache.org/licenses/LICENSE-2.0
  10 #
  11 # Unless required by applicable law or agreed to in writing, software
  12 # distributed under the License is distributed on an "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 # See the License for the specific language governing permissions and
  15 # limitations under the License.
  16
  17 """Convenience functions.
  18 """
  19
  20 from google.appengine.api import datastore
  21
  22
  23 def transactional(operation):
  24   """Decorator that wraps a method in a datastore transaction.
  25
  26   The method will be called through datastore.RunInTransaction, making the
  27   operation atomic.
  28   """
  29   def transactional_operation(*args, **kwargs):
  30     return datastore.RunInTransaction(operation, *args, **kwargs)
  31   return transactional_operation