aae364daa3
The run iteration capability can be used to iterate over the engines activity and do various other activities in-between the engine state iteration; this example shows a primitive use of this to output the state counter and the transition itself. Change-Id: I63ac343566a4a090a20a84c626ddea3651033926
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 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.engines.action_engine import engine
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from taskflow.patterns import linear_flow as lf
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from taskflow.persistence.backends import impl_memory
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from taskflow import task
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from taskflow.utils import persistence_utils
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# INTRO: This examples shows how to run a engine using the engine iteration
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# capability, in between iterations other activities occur (in this case a
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# value is output to stdout); but more complicated actions can occur at the
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# boundary when a engine yields its current state back to the caller.
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class EchoNameTask(task.Task):
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def execute(self):
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print(self.name)
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f = lf.Flow("counter")
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for i in range(0, 10):
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f.add(EchoNameTask("echo_%s" % (i + 1)))
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be = impl_memory.MemoryBackend()
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book = persistence_utils.temporary_log_book(be)
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fd = persistence_utils.create_flow_detail(f, book, be)
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e = engine.SingleThreadedActionEngine(f, fd, be, {})
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e.compile()
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e.prepare()
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for i, st in enumerate(e.run_iter(), 1):
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print("Transition %s: %s" % (i, st))
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