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# -*- coding: utf-8 -*-
# Copyright (C) 2014 Yahoo! Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import logging
import os
import sys
logging.basicConfig(level=logging.ERROR)
self_dir = os.path.abspath(os.path.dirname(__file__))
top_dir = os.path.abspath(os.path.join(os.path.dirname(__file__),
os.pardir,
os.pardir))
sys.path.insert(0, top_dir)
sys.path.insert(0, self_dir)
from taskflow import engines
from taskflow.patterns import linear_flow
from taskflow import task
# INTRO: This example shows how a task (in a linear/serial workflow) can
# produce an output that can be then consumed/used by a downstream task.
class TaskA(task.Task):
default_provides = 'a'
def execute(self):
print("Executing '%s'" % (self.name))
return 'a'
class TaskB(task.Task):
def execute(self, a):
print("Executing '%s'" % (self.name))
print("Got input '%s'" % (a))
print("Constructing...")
wf = linear_flow.Flow("pass-from-to")
wf.add(TaskA('a'), TaskB('b'))
print("Loading...")
e = engines.load(wf)
print("Compiling...")
e.compile()
print("Preparing...")
e.prepare()
print("Running...")
e.run()
print("Done...")
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