WordCountTopology.java

/*
 * Copyright (c) 2015, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
 *
 * 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 org.storm.sample.wordcount;

import backtype.storm.Config;
import backtype.storm.LocalCluster;
import backtype.storm.StormSubmitter;
import backtype.storm.topology.TopologyBuilder;
import backtype.storm.tuple.Fields;
import org.storm.sample.wordcount.bolt.SplitSentence;
import org.storm.sample.wordcount.bolt.WordCount;
import org.storm.sample.wordcount.spout.LineStreamer;

/**
 * This topology demonstrates Storm's stream groupings capabilities using word counting as an example.
 */
public class WordCountTopology {

    public static void main(String[] args) throws Exception {

        TopologyBuilder builder = new TopologyBuilder();

        builder.setSpout("line", new LineStreamer(), 5);
        builder.setBolt("split", new SplitSentence(), 8).shuffleGrouping("line");
        builder.setBolt("count", new WordCount(), 12).fieldsGrouping("split", new Fields("word"));

        Config conf = new Config();
        conf.setDebug(false);


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