examples/storm-perf/src/main/java/org/apache/storm/perf/bolt/SplitSentenceBolt.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.perf.bolt;

import java.util.Map;
import org.apache.storm.task.TopologyContext;
import org.apache.storm.topology.BasicOutputCollector;
import org.apache.storm.topology.OutputFieldsDeclarer;
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;


public class SplitSentenceBolt extends BaseBasicBolt {
    public static final String FIELDS = "word";

    public static String[] splitSentence(String sentence) {
        if (sentence != null) {
            return sentence.split("\\s+");
        }
        return null;
    }

    @Override
    public void prepare(Map<String, Object> topoConf, TopologyContext context) {
    }

    @Override
    public void execute(Tuple input, BasicOutputCollector collector) {
        for (String word : splitSentence(input.getString(0))) {
            collector.emit(new Values(word));
        }
    }

    @Override
    public void declareOutputFields(OutputFieldsDeclarer declarer) {
        declarer.declare(new Fields(FIELDS));
    }
}