dd9d5c157e
Use a new rollback accumulator to collect which tasks need to be rolled back and use that in the ordered workflow code. Move the usage of provides/requires as functions and just let them be attributes of the flow objects.
54 lines
2.0 KiB
Python
54 lines
2.0 KiB
Python
# -*- coding: utf-8 -*-
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (C) 2012 Yahoo! Inc. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import inspect
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from taskflow import task
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AUTO_ARGS = ('self', 'context',)
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class FunctorTask(task.Task):
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"""A simple task that can wrap two given functions and allow them to be
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in combination used in apply and reverting a given task. Useful for
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situations where existing functions already are in place and you just want
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to wrap them up."""
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def __init__(self, name, apply_functor, revert_functor,
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provides_what=None, extract_requires=False):
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if not name:
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name = "_".join([apply_functor.__name__, revert_functor.__name__])
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super(FunctorTask, self).__init__(name)
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self._apply_functor = apply_functor
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self._revert_functor = revert_functor
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if provides_what:
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self.provides.update(provides_what)
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if extract_requires:
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for arg_name in inspect.getargspec(apply_functor).args:
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# These are automatically given, ignore.
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if arg_name in AUTO_ARGS:
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continue
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self.requires.add(arg_name)
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def apply(self, context, *args, **kwargs):
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return self._apply_functor(context, *args, **kwargs)
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def revert(self, context, result, cause):
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if self._revert_functor:
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self._revert_functor(context, result, cause)
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