/** * 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) { _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")); } } }