68 lines
2.0 KiB
Python
68 lines
2.0 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2013 Mirantis, Inc.
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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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class Priority(object):
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"""Returns a priority sequence from hightest to lowest.
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Node with priority 0 will be deployed first. We have a big step
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because we want to allow user redefine deployment order and
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he can use free space between prioriries.
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:param step: an increment step
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"""
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#: default priority step
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default_step = 100
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def __init__(self, step=default_step):
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self._step = step
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self._priority = 0
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def next(self):
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self._priority += self._step
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return self._priority
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@property
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def current(self):
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return self._priority
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class PriorityStrategy(object):
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"""Set priorities for sequence of tasks using some strategy"""
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def __init__(self):
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#: priority sequence generator
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self._priority = Priority()
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def one_by_one(self, tasks):
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"""Deploy given tasks one by one."""
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for t in tasks:
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t['priority'] = self._priority.next()
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def in_parallel(self, tasks):
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"""Deploy given tasks in parallel mode."""
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self._priority.next()
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for t in tasks:
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t['priority'] = self._priority.current
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def in_parallel_by(self, tasks, amount):
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"""Deploy given nodes in parallel by chunks."""
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for index, task in enumerate(tasks):
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if index % amount == 0:
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self._priority.next()
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task['priority'] = self._priority.current
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