| /** |
| * 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.starter; |
| |
| import java.util.Map; |
| import org.apache.storm.task.OutputCollector; |
| import org.apache.storm.task.TopologyContext; |
| import org.apache.storm.testing.TestWordSpout; |
| import org.apache.storm.topology.ConfigurableTopology; |
| 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; |
| |
| /** |
| * This is a basic example of a Storm topology. |
| */ |
| public class ExclamationTopology extends ConfigurableTopology { |
| |
| public static void main(String[] args) throws Exception { |
| ConfigurableTopology.start(new ExclamationTopology(), args); |
| } |
| |
| protected int run(String[] args) { |
| TopologyBuilder builder = new TopologyBuilder(); |
| |
| builder.setSpout("word", new TestWordSpout(), 10); |
| builder.setBolt("exclaim1", new ExclamationBolt(), 3).shuffleGrouping("word"); |
| builder.setBolt("exclaim2", new ExclamationBolt(), 2).shuffleGrouping("exclaim1"); |
| |
| conf.setDebug(true); |
| |
| String topologyName = "test"; |
| |
| conf.setNumWorkers(3); |
| |
| if (args != null && args.length > 0) { |
| topologyName = args[0]; |
| } |
| |
| return submit(topologyName, conf, builder); |
| } |
| |
| public static class ExclamationBolt extends BaseRichBolt { |
| OutputCollector collector; |
| |
| @Override |
| public void prepare(Map<String, Object> conf, 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")); |
| } |
| |
| } |
| } |