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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)
top_dir = os.path.abspath(os.path.join(os.path.dirname(__file__),
os.pardir,
os.pardir))
sys.path.insert(0, top_dir)
from taskflow import engines
from taskflow.patterns import graph_flow as gf
from taskflow import task
class DummyTask(task.Task):
def execute(self):
print("Running %s" % self.name)
def allow(history):
print(history)
return False
# Declare our work to be done...
r = gf.Flow("root")
r_a = DummyTask('r-a')
r_b = DummyTask('r-b')
r.add(r_a, r_b)
r.link(r_a, r_b, decider=allow)
# Setup and run the engine layer.
e = engines.load(r)
e.compile()
e.prepare()
e.run()
print("---------")
print("After run")
print("---------")
backend = e.storage.backend
entries = [os.path.join(backend.memory.root_path, child)
for child in backend.memory.ls(backend.memory.root_path)]
while entries:
path = entries.pop()
value = backend.memory[path]
if value:
print("%s -> %s" % (path, value))
else:
print("%s" % (path))
entries.extend(os.path.join(path, child)
for child in backend.memory.ls(path))
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