84 lines
2.4 KiB
Python
84 lines
2.4 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright (C) 2015 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 as lf
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from taskflow.persistence import backends
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from taskflow import task
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from taskflow.utils import persistence_utils as pu
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# INTRO: in this example we create a dummy flow with a dummy task, and run
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# it using a in-memory backend and pre/post run we dump out the contents
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# of the in-memory backends tree structure (which can be quite useful to
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# look at for debugging or other analysis).
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class PrintTask(task.Task):
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def execute(self):
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print("Running '%s'" % self.name)
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backend = backends.fetch({
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'connection': 'memory://',
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})
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book, flow_detail = pu.temporary_flow_detail(backend=backend)
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# Make a little flow and run it...
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f = lf.Flow('root')
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for alpha in ['a', 'b', 'c']:
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f.add(PrintTask(alpha))
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e = engines.load(f, flow_detail=flow_detail,
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book=book, backend=backend)
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e.compile()
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e.prepare()
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print("----------")
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print("Before run")
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print("----------")
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print(backend.memory.pformat())
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print("----------")
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e.run()
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print("---------")
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print("After run")
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print("---------")
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entries = [os.path.join(backend.memory.root_path, child)
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for child in backend.memory.ls(backend.memory.root_path)]
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while entries:
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path = entries.pop()
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value = backend.memory[path]
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if value:
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print("%s -> %s" % (path, value))
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else:
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print("%s" % (path))
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entries.extend(os.path.join(path, child)
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for child in backend.memory.ls(path))
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