| #!/usr/bin/env python |
| # -*- encoding: utf-8 -*- |
| |
| # Licensed to the Apache Software Foundation (ASF) under one |
| # or more contributor license agreements. See the NOTICE file |
| # distributed with this work for additional information |
| # regarding copyright ownership. The ASF licenses this file |
| # to you 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. |
| |
| '''arraylooper.py: module for defining a simple Generator''' |
| |
| import collections |
| import itertools |
| import time |
| |
| from heronpy.streamlet.generator import Generator |
| |
| class ArrayLooper(Generator): |
| """A ArrayLooper loops the contents of the a user supplied array forever |
| """ |
| def __init__(self, user_iterable, sleep=None): |
| super(ArrayLooper, self).__init__() |
| if not isinstance(user_iterable, collections.Iterable): |
| raise RuntimeError("ArrayLooper must be passed an iterable") |
| self._user_iterable = user_iterable |
| self._sleep = sleep |
| |
| # pylint: disable=unused-argument, attribute-defined-outside-init |
| def setup(self, context): |
| self._curiter = itertools.cycle(self._user_iterable) |
| |
| def get(self): |
| if self._sleep is not None: |
| time.sleep(self._sleep) |
| return next(self._curiter) |