#!/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