blob: 52bd286e0e9056e1690ac21838589533c192a6b4 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
# -*- coding: utf-8 -*-
# Copyright (C) 2012 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.
from taskflow import flow
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()
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)
|
