60 lines
2.0 KiB
Python
60 lines
2.0 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright (C) 2014 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 random
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import sys
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import time
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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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from taskflow import engines
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from taskflow.listeners import timing
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from taskflow.patterns import linear_flow as lf
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from taskflow import task
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# INTRO: in this example we will attach a listener to an engine
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# and have variable run time tasks run and show how the listener will print
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# out how long those tasks took (when they started and when they finished).
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#
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# This shows how timing metrics can be gathered (or attached onto an engine)
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# after a workflow has been constructed, making it easy to gather metrics
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# dynamically for situations where this kind of information is applicable (or
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# even adding this information on at a later point in the future when your
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# application starts to slow down).
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class VariableTask(task.Task):
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def __init__(self, name):
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super(VariableTask, self).__init__(name)
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self._sleepy_time = random.random()
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def execute(self):
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time.sleep(self._sleepy_time)
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f = lf.Flow('root')
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f.add(VariableTask('a'), VariableTask('b'), VariableTask('c'))
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e = engines.load(f)
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with timing.PrintingDurationListener(e):
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e.run()
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