75eac61a06
- Remove flow REVERTING state. Now flow can be running and reverting simultaneously. Until flow isn't finished it is in RUNNING state. - Add RETRYING state for the retry controller. - Implement smart revertion and flow retries and retries resumption. - Default retry controllers: Times, ForEach and ParameterizedForEach. - Example and unit tests. Implements: blueprint subgraph-execution Implements: blueprint reversion-strategies Implements: blueprint smart-revert Change-Id: Ifa600bcad1edf2910f02ac36783cd458afbd880c
66 lines
2.3 KiB
Python
66 lines
2.3 KiB
Python
# -*- coding: utf-8 -*-
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (C) 2012-2013 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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import logging
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import os
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import sys
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logging.basicConfig(level=logging.ERROR)
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top_dir = os.path.abspath(os.path.join(os.path.dirname(__file__),
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os.pardir,
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os.pardir))
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sys.path.insert(0, top_dir)
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import taskflow.engines
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from taskflow.patterns import linear_flow as lf
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from taskflow import retry
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from taskflow import task
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# INTRO: In this example we create a retry controller that receives a phone
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# directory and tries different phone numbers. The next task tries to call Jim
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# using the given number. If if is not a Jim's number, the tasks raises an
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# exception and retry controller takes the next number from the phone
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# directory and retries the call.
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#
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# This example shows a basic usage of retry controllers in a flow.
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# Retry controllers allows to revert and retry a failed subflow with new
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# parameters.
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class CallJim(task.Task):
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def execute(self, jim_number):
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print ("Calling jim %s." % jim_number)
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if jim_number != 555:
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raise Exception("Wrong number!")
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else:
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print ("Hello Jim!")
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def revert(self, jim_number, **kwargs):
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print ("Wrong number, apologizing.")
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# Create your flow and associated tasks (the work to be done).
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flow = lf.Flow('retrying-linear',
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retry=retry.ParameterizedForEach(
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rebind=['phone_directory'],
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provides='jim_number')).add(CallJim())
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# Now run that flow using the provided initial data (store below).
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taskflow.engines.run(flow, store={'phone_directory': [333, 444, 555, 666]})
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