36176a5842
* Renamed method 'stop_workflow' to 'pause_workflow' for engine and workflow handler. * Renamed state 'STOPPED' to 'PAUSED' according to the name of engine instruction 'pause' Change-Id: Iee549fe25e93d68a6c15b2ce2c5f2da0df9af080
62 lines
1.5 KiB
Python
62 lines
1.5 KiB
Python
# -*- coding: utf-8 -*-
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#
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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");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Valid task and workflow states."""
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IDLE = 'IDLE'
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RUNNING = 'RUNNING'
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PAUSED = 'PAUSED'
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DELAYED = 'DELAYED'
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SUCCESS = 'SUCCESS'
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ERROR = 'ERROR'
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_ALL = [IDLE, RUNNING, SUCCESS, ERROR, PAUSED, DELAYED]
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_VALID_TRANSITIONS = {
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IDLE: [RUNNING, ERROR],
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RUNNING: [PAUSED, DELAYED, SUCCESS, ERROR],
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PAUSED: [RUNNING, ERROR],
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DELAYED: [RUNNING, ERROR],
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SUCCESS: [],
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ERROR: []
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}
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def is_valid(state):
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return state in _ALL
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def is_invalid(state):
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return not is_valid(state)
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def is_finished(state):
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return state in [SUCCESS, ERROR]
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def is_paused_or_finished(state):
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return state == PAUSED or is_finished(state)
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def is_valid_transition(from_state, to_state):
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if is_invalid(from_state) or is_invalid(to_state):
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return False
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if from_state == to_state:
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return True
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return to_state in _VALID_TRANSITIONS[from_state]
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