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WordCountTopology.java
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/
WordCountTopology.java
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/**
* 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.HashMap;
import java.util.Map;
import org.apache.storm.starter.bolt.WordCountBolt;
import org.apache.storm.starter.spout.RandomSentenceSpout;
import org.apache.storm.task.ShellBolt;
import org.apache.storm.topology.BasicOutputCollector;
import org.apache.storm.topology.ConfigurableTopology;
import org.apache.storm.topology.IRichBolt;
import org.apache.storm.topology.OutputFieldsDeclarer;
import org.apache.storm.topology.TopologyBuilder;
import org.apache.storm.topology.base.BaseBasicBolt;
import org.apache.storm.tuple.Fields;
import org.apache.storm.tuple.Tuple;
import org.apache.storm.tuple.Values;
/**
* This topology demonstrates Storm's stream groupings and multilang
* capabilities.
*/
public class WordCountTopology extends ConfigurableTopology {
public static void main(String[] args) throws Exception {
ConfigurableTopology.start(new WordCountTopology(), args);
}
@Override
protected int run(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 WordCountBolt(), 12).fieldsGrouping("split", new Fields("word"));
conf.setDebug(true);
String topologyName = "word-count";
conf.setNumWorkers(3);
if (args != null && args.length > 0) {
topologyName = args[0];
}
return submit(topologyName, conf, builder);
}
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;
}
}
}