#!/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