60a9e6a817
New method allows to iterate over flow node and get access to node metadata during iteration. Change-Id: Ib0fc77f0597961602fbc3b49ba09e4df815d8230
67 lines
2.1 KiB
Python
67 lines
2.1 KiB
Python
# -*- coding: utf-8 -*-
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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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from taskflow import flow
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_LINK_METADATA = {flow.LINK_INVARIANT: True}
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class Flow(flow.Flow):
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"""Linear flow pattern.
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A linear (potentially nested) flow of *tasks/flows* that can be
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applied in order as one unit and rolled back as one unit using
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the reverse order that the *tasks/flows* have been applied in.
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"""
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def __init__(self, name, retry=None):
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super(Flow, self).__init__(name, retry)
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self._children = []
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def add(self, *items):
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"""Adds a given task/tasks/flow/flows to this flow."""
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items = [i for i in items if i not in self._children]
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self._children.extend(items)
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return self
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def __len__(self):
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return len(self._children)
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def __iter__(self):
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for child in self._children:
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yield child
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@property
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def requires(self):
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requires = set()
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prior_provides = set()
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if self._retry is not None:
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requires.update(self._retry.requires)
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prior_provides.update(self._retry.provides)
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for item in self:
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requires.update(item.requires - prior_provides)
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prior_provides.update(item.provides)
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return frozenset(requires)
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def iter_links(self):
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for src, dst in zip(self._children[:-1], self._children[1:]):
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yield (src, dst, _LINK_METADATA.copy())
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def iter_nodes(self):
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for n in self._children:
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yield (n, {})
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