| #!/usr/bin/env python |
| # -*- encoding: utf-8 -*- |
| |
| # copyright 2016 twitter. 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. |
| '''Example StatefulWordCountTopology''' |
| import sys |
| |
| import heronpy.api.api_constants as constants |
| from heronpy.api.topology import TopologyBuilder |
| from heronpy.api.stream import Grouping |
| from examples.src.python.spout import StatefulWordSpout |
| from examples.src.python.bolt import StatefulCountBolt |
| |
| # Topology is defined using a topology builder |
| # Refer to multi_stream_topology for defining a topology by subclassing Topology |
| # pylint: disable=superfluous-parens |
| if __name__ == '__main__': |
| if len(sys.argv) != 2: |
| print("Topology's name is not specified") |
| sys.exit(1) |
| |
| builder = TopologyBuilder(name=sys.argv[1]) |
| |
| word_spout = builder.add_spout("word_spout", StatefulWordSpout, par=2) |
| count_bolt = builder.add_bolt("count_bolt", StatefulCountBolt, par=2, |
| inputs={word_spout: Grouping.fields('word')}, |
| config={constants.TOPOLOGY_TICK_TUPLE_FREQ_SECS: 10}) |
| |
| topology_config = {constants.TOPOLOGY_RELIABILITY_MODE: |
| constants.TopologyReliabilityMode.EFFECTIVELY_ONCE, |
| constants.TOPOLOGY_STATEFUL_CHECKPOINT_INTERVAL_SECONDS: 30} |
| builder.set_config(topology_config) |
| |
| builder.build_and_submit() |