| /** |
| * 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. |
| */ |
| |
| package org.apache.storm.examples; |
| |
| import java.time.Duration; |
| import java.util.Map; |
| |
| import org.apache.storm.Config; |
| import org.apache.storm.LocalCluster; |
| import org.apache.storm.StormSubmitter; |
| import org.apache.storm.examples.spout.TestWordSpout; |
| import org.apache.storm.task.OutputCollector; |
| import org.apache.storm.task.TopologyContext; |
| import org.apache.storm.topology.OutputFieldsDeclarer; |
| import org.apache.storm.topology.TopologyBuilder; |
| import org.apache.storm.topology.base.BaseRichBolt; |
| import org.apache.storm.tuple.Fields; |
| import org.apache.storm.tuple.Tuple; |
| import org.apache.storm.tuple.Values; |
| import org.apache.storm.utils.Utils; |
| |
| /** |
| * This is a basic example of a Storm topology. |
| */ |
| public final class ExclamationTopology { |
| |
| private ExclamationTopology() { |
| } |
| |
| public static void main(String[] args) throws Exception { |
| TopologyBuilder builder = new TopologyBuilder(); |
| int parallelism = 2; |
| |
| int spouts = parallelism; |
| builder.setSpout("word", new TestWordSpout(Duration.ofMillis(50)), spouts); |
| int bolts = 2 * parallelism; |
| builder.setBolt("exclaim1", new ExclamationBolt(), bolts) |
| .shuffleGrouping("word"); |
| |
| Config conf = new Config(); |
| conf.setDebug(true); |
| conf.setMaxSpoutPending(10); |
| conf.setMessageTimeoutSecs(600); |
| conf.put(Config.TOPOLOGY_WORKER_CHILDOPTS, "-XX:+HeapDumpOnOutOfMemoryError"); |
| |
| if (args != null && args.length > 0) { |
| conf.setNumWorkers(parallelism); |
| StormSubmitter.submitTopology(args[0], conf, builder.createTopology()); |
| } else { |
| System.out.println("Topology name not provided as an argument, running in simulator mode."); |
| LocalCluster cluster = new LocalCluster(); |
| cluster.submitTopology("test", conf, builder.createTopology()); |
| Utils.sleep(10000); |
| cluster.killTopology("test"); |
| cluster.shutdown(); |
| } |
| } |
| |
| public static class ExclamationBolt extends BaseRichBolt { |
| private static final long serialVersionUID = -8306159767177544059L; |
| private OutputCollector collector; |
| |
| @Override |
| @SuppressWarnings({"HiddenField", "rawtypes"}) |
| public void prepare(Map stormConf, TopologyContext context, |
| OutputCollector collector) { |
| this.collector = collector; |
| |
| } |
| |
| @Override |
| public void execute(Tuple tuple) { |
| collector.emit(tuple, new Values(tuple.getString(0) + "!!!")); |
| collector.ack(tuple); |
| } |
| |
| @Override |
| public void declareOutputFields(OutputFieldsDeclarer declarer) { |
| declarer.declare(new Fields("word")); |
| } |
| } |
| } |