WordCountTopology.java

/**
 * WordCountTopologyUB is used to run a demo topology with "split" sentence bolt as an updatable bolt.
 * It can be updated to a different version which is not specified at the topology building time by making use of signals. 
 *
 *
 * @author Tarun Sharma
 * @version 1.0
 * @see <a href="http://www.dream-lab.in/">DREAM:Lab</a>
 *
 * Copyright 2014 DREAM:Lab, Indian Institute of Science, 2014
 *
 * 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.
 */

package mypackage.topology;

import mypackage.bolts.SplitSentence;
import mypackage.bolts.WordCount;
import mypackage.spouts.RandomSentenceSpout;
import backtype.storm.Config;
import backtype.storm.LocalCluster;
import backtype.storm.StormSubmitter;
import backtype.storm.topology.TopologyBuilder;
import backtype.storm.tuple.Fields;
import backtype.storm.utils.Utils;

public class WordCountTopology {
	
	public static void main(String[] args) throws Exception {
	    TopologyBuilder builder = new TopologyBuilder();
	    
		builder.setSpout("sentences", new RandomSentenceSpout(), 1);
		
//		UpdatableBoltLocationEntry updatableEntry = new UpdatableBoltLocationEntry("1", "v1", "in.dream_lab.stream.storm.samples.wordcount.bolts.SplitSentence");
//		IUpdatableBolt b1 = UpdateFactory.newUpdatableBolt(updatableEntry, "topoName", "split");
//		builder.setBolt("split", b1, 1).shuffleGrouping("sentences");
		builder.setBolt("split", new SplitSentence(), 1).shuffleGrouping("sentences");		
		builder.setBolt("count", new WordCount(), 1).fieldsGrouping("split", new Fields("word"));
		
		//System.out.println("SIGNAME IS " + b1.getSignalName());
		
	    Config conf = new Config();
	    conf.setDebug(true);

	    if (args != null && args.length > 0) {
	      conf.setNumWorkers(3);

	      StormSubmitter.submitTopology(args[0], conf, builder.createTopology());
	    }
	    else {

	      LocalCluster cluster = new LocalCluster();
	      cluster.submitTopology("test", conf, builder.createTopology());
	      Utils.sleep(10000);
	      cluster.killTopology("test");
	      cluster.shutdown();
	    }
	  }
}