integration-test/src/main/java/org/apache/storm/ExclamationTopology.java

/*
 * 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;

import org.apache.storm.generated.StormTopology;
import org.apache.storm.task.OutputCollector;
import org.apache.storm.task.TopologyContext;
import org.apache.storm.testing.TestWordSpout;
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;
import org.apache.storm.utils.Utils;

import java.util.Map;

/**
 * This is a basic example of a Storm topology.
 */
public class ExclamationTopology {

  public static final String WORD = "word";
  public static final String EXCLAIM_1 = "exclaim1";
  public static final String EXCLAIM_2 = "exclaim2";

  public static class ExclamationBolt extends BaseRichBolt {
    OutputCollector _collector;

    @Override
    public void prepare(Map 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"));
    }


  }

  public static void main(String[] args) throws Exception {
    StormTopology topology = getStormTopology();

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

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

      StormSubmitter.submitTopologyWithProgressBar(args[0], conf, topology);
    }
    else {

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

  public static StormTopology getStormTopology() {
    TopologyBuilder builder = new TopologyBuilder();
    builder.setSpout(WORD, new TestWordSpout(), 10);
    builder.setBolt(EXCLAIM_1, new ExclamationTopology.ExclamationBolt(), 3).shuffleGrouping(WORD);
    builder.setBolt(EXCLAIM_2, new ExclamationTopology.ExclamationBolt(), 2).shuffleGrouping(EXCLAIM_1);
    return builder.createTopology();
  }
}