Source code for taskflow.patterns.unordered_flow

# -*- coding: utf-8 -*-

#    Copyright (C) 2012 Yahoo! Inc. All Rights Reserved.
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#    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
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#    under the License.

from taskflow import flow


[docs]class Flow(flow.Flow): """Unordered flow pattern. A unordered (potentially nested) flow of *tasks/flows* that can be executed in any order as one unit and rolled back as one unit. """ def __init__(self, name, retry=None): super(Flow, self).__init__(name, retry) # NOTE(imelnikov): A unordered flow is unordered, so we use # set instead of list to save children, children so that # people using it don't depend on the ordering. self._children = set()
[docs] def add(self, *items): """Adds a given task/tasks/flow/flows to this flow.""" self._children.update(items) return self
def __len__(self): return len(self._children) def __iter__(self): for child in self._children: yield child def iter_links(self): # NOTE(imelnikov): children in unordered flow have no dependencies # between each other due to invariants retained during construction. return iter(()) @property def requires(self): requires = set() retry_provides = set() if self._retry is not None: requires.update(self._retry.requires) retry_provides.update(self._retry.provides) for item in self: item_requires = item.requires - retry_provides requires.update(item_requires) return frozenset(requires)