| #!/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. |
| |
| """module for example bolt: WindowSizeBolt""" |
| from heronpy.api.bolt.window_bolt import SlidingWindowBolt |
| |
| # pylint: disable=unused-argument |
| class WindowSizeBolt(SlidingWindowBolt): |
| """WindowSizeBolt |
| A bolt that calculates the average batch size of window""" |
| |
| def initialize(self, config, context): |
| super(WindowSizeBolt, self).initialize(config, context) |
| self.numerator = 0.0 |
| self.denominator = 0.0 |
| |
| def processWindow(self, window_info, tuples): |
| self.numerator += len(tuples) |
| self.denominator += 1 |
| self.logger.info("The current average is %f" % (self.numerator / self.denominator)) |
