| #!/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. |
| |
| '''Example WordCountStreamletTopology''' |
| import sys |
| |
| from heronpy.streamlet.streamlet import TimeWindow |
| from heronpy.connectors.pulsar.pulsarstreamlet import PulsarStreamlet |
| |
| # pylint: disable=superfluous-parens |
| if __name__ == '__main__': |
| if len(sys.argv) != 4: |
| print(""" |
| Usage: pulsar_would_count_streamlet.pex <topology_name> <pulsar_service_url> <pulsar_topic> |
| """) |
| sys.exit(1) |
| |
| counts = PulsarStreamlet.pulsarStreamlet(sys.argv[2], sys.argv[3], parallelism=2) \ |
| .flat_map(lambda line: line.split(), parallelism=2) \ |
| .map(lambda word: (word, 1), parallelism=2) \ |
| .reduce_by_window(TimeWindow(10, 2), lambda x, y: x + y) |
| counts.run(sys.argv[1]) |