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#!/usr/bin/env python
#
# Copyright 2010 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.
"""DB-related operations."""
__all__ = ['Put', 'Delete']
from mapreduce.operation import base
# TODO(user): handler function annotation which requests to
# use db calls directly without batching them/doing async db calls.
class Put(base.Operation):
"""Put entity into datastore via mutation_pool.
See mapreduce.context.MutationPool.
"""
def __init__(self, entity):
"""Constructor.
Args:
entity: an entity to put.
"""
self.entity = entity
def __call__(self, context):
"""Perform operation.
Args:
context: mapreduce context as context.Context.
"""
context.mutation_pool.put(self.entity)
class Delete(base.Operation):
"""Delete entity from datastore via mutation_pool.
See mapreduce.context.MutationPool.
"""
def __init__(self, entity):
"""Constructor.
Args:
entity: a key or model instance to delete.
"""
self.entity = entity
def __call__(self, context):
"""Perform operation.
Args:
context: mapreduce context as context.Context.
"""
context.mutation_pool.delete(self.entity)