69 lines
1.8 KiB
Python
69 lines
1.8 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 sys
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logging.basicConfig(level=logging.ERROR)
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self_dir = os.path.abspath(os.path.dirname(__file__))
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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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sys.path.insert(0, self_dir)
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from taskflow import engines
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from taskflow.patterns import linear_flow
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from taskflow import task
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# INTRO: This example shows how a task (in a linear/serial workflow) can
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# produce an output that can be then consumed/used by a downstream task.
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class TaskA(task.Task):
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default_provides = 'a'
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def execute(self):
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print("Executing '%s'" % (self.name))
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return 'a'
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class TaskB(task.Task):
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def execute(self, a):
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print("Executing '%s'" % (self.name))
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print("Got input '%s'" % (a))
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print("Constructing...")
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wf = linear_flow.Flow("pass-from-to")
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wf.add(TaskA('a'), TaskB('b'))
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print("Loading...")
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e = engines.load(wf)
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print("Compiling...")
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e.compile()
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print("Preparing...")
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e.prepare()
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print("Running...")
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e.run()
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print("Done...")
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