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# -*- coding: utf-8 -*-
# Copyright (C) 2015 Yahoo! Inc. All Rights Reserved.
#
# 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.
import abc
import six
from taskflow import states
@six.add_metaclass(abc.ABCMeta)
class Action(object):
"""An action that handles executing, state changes, ... of atoms."""
NO_RESULT = object()
"""
Sentinel use to represent lack of any result (none can be a valid result)
"""
#: States that are expected to have a result to save...
SAVE_RESULT_STATES = (states.SUCCESS, states.FAILURE,
states.REVERTED, states.REVERT_FAILURE)
def __init__(self, storage, notifier):
self._storage = storage
self._notifier = notifier
@abc.abstractmethod
def schedule_execution(self, atom):
"""Schedules atom execution."""
@abc.abstractmethod
def schedule_reversion(self, atom):
"""Schedules atom reversion."""
@abc.abstractmethod
def complete_reversion(self, atom, result):
"""Completes atom reversion."""
@abc.abstractmethod
def complete_execution(self, atom, result):
"""Completes atom execution."""
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