| /** |
| * 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 storm.starter; |
| |
| import backtype.storm.Config; |
| import backtype.storm.LocalCluster; |
| import backtype.storm.StormSubmitter; |
| import backtype.storm.task.ShellBolt; |
| import backtype.storm.topology.BasicOutputCollector; |
| import backtype.storm.topology.IRichBolt; |
| import backtype.storm.topology.OutputFieldsDeclarer; |
| import backtype.storm.topology.TopologyBuilder; |
| import backtype.storm.topology.base.BaseBasicBolt; |
| import backtype.storm.tuple.Fields; |
| import backtype.storm.tuple.Tuple; |
| import backtype.storm.tuple.Values; |
| import storm.starter.spout.RandomSentenceSpout; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * This topology demonstrates Storm's stream groupings and multilang capabilities. |
| */ |
| public class WordCountTopology { |
| public static class SplitSentence extends ShellBolt implements IRichBolt { |
| |
| public SplitSentence() { |
| super("python", "splitsentence.py"); |
| } |
| |
| @Override |
| public void declareOutputFields(OutputFieldsDeclarer declarer) { |
| declarer.declare(new Fields("word")); |
| } |
| |
| @Override |
| public Map<String, Object> getComponentConfiguration() { |
| return null; |
| } |
| } |
| |
| public static class WordCount extends BaseBasicBolt { |
| Map<String, Integer> counts = new HashMap<String, Integer>(); |
| |
| @Override |
| public void execute(Tuple tuple, BasicOutputCollector collector) { |
| String word = tuple.getString(0); |
| Integer count = counts.get(word); |
| if (count == null) |
| count = 0; |
| count++; |
| counts.put(word, count); |
| collector.emit(new Values(word, count)); |
| } |
| |
| @Override |
| public void declareOutputFields(OutputFieldsDeclarer declarer) { |
| declarer.declare(new Fields("word", "count")); |
| } |
| } |
| |
| public static void main(String[] args) throws Exception { |
| |
| TopologyBuilder builder = new TopologyBuilder(); |
| |
| builder.setSpout("spout", new RandomSentenceSpout(), 5); |
| |
| builder.setBolt("split", new SplitSentence(), 8).shuffleGrouping("spout"); |
| builder.setBolt("count", new WordCount(), 12).fieldsGrouping("split", new Fields("word")); |
| |
| Config conf = new Config(); |
| conf.setDebug(true); |
| |
| |
| if (args != null && args.length > 0) { |
| conf.setNumWorkers(3); |
| |
| StormSubmitter.submitTopologyWithProgressBar(args[0], conf, builder.createTopology()); |
| } |
| else { |
| conf.setMaxTaskParallelism(3); |
| |
| LocalCluster cluster = new LocalCluster(); |
| cluster.submitTopology("word-count", conf, builder.createTopology()); |
| |
| Thread.sleep(10000); |
| |
| cluster.shutdown(); |
| } |
| } |
| } |