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Storm wordcount

package com.waiting;


import org.apache.storm.Config;
import org.apache.storm.LocalCluster;
import org.apache.storm.shade.org.apache.commons.io.FileUtils;
import org.apache.storm.spout.SpoutOutputCollector;
import org.apache.storm.task.OutputCollector;
import org.apache.storm.task.TopologyContext;
import org.apache.storm.topology.OutputFieldsDeclarer;
import org.apache.storm.topology.TopologyBuilder;
import org.apache.storm.topology.base.BaseRichBolt;
import org.apache.storm.topology.base.BaseRichSpout;
import org.apache.storm.tuple.Fields;
import org.apache.storm.tuple.Tuple;
import org.apache.storm.tuple.Values;

import java.io.File;
import java.io.IOException;
import java.util.*;

public class LocalWordCountStormTopology {


    public static class DataSourceSpout extends BaseRichSpout {

        private SpoutOutputCollector collector;

        @Override
        public void open(Map conf, TopologyContext context, SpoutOutputCollector collector) {
            this.collector = collector;
        }

        @Override
        public void nextTuple() {
            Collection<File> files = FileUtils.listFiles(new File("/Users/walle/Documents/D3/d2")
            ,new String[]{"txt"}, true);

            for(File file:files){
                try{
                    List<String> lines = FileUtils.readLines(file);
                    for(String line: lines){
                        this.collector.emit(new Values(line));
                    }

                    FileUtils.moveFile(file, new File(file.getAbsolutePath() + System.currentTimeMillis()));
                }catch (IOException e){
                    e.printStackTrace();
                }
            }

        }

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

    public static class SplitBolt extends BaseRichBolt{

        private OutputCollector collector;
        @Override
        public void prepare(Map stormConf, TopologyContext context, OutputCollector collector) {
            this.collector = collector;
        }

        @Override
        public void execute(Tuple input) {
            String line = input.getStringByField("line");
            String[] words = line.split(",");

            for(String word: words){
                this.collector.emit(new Values(word));
            }
        }

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

    public static class CountBolt extends BaseRichBolt{
        @Override
        public void prepare(Map stormConf, TopologyContext context, OutputCollector collector) {

        }

        Map<String, Integer> map = new HashMap<String, Integer>();
        @Override
        public void execute(Tuple input) {
            String word = input.getStringByField("word");
            Integer count = map.get(word);
            if(count == null){
                count = 0;
            }
            count ++;
            map.put(word, count);

            System.out.println("-------");
            Set<Map.Entry<String, Integer>> entrySet = map.entrySet();
            for(Map.Entry<String, Integer> entry:entrySet){
                System.out.println(entry);
            }
        }

        @Override
        public void declareOutputFields(OutputFieldsDeclarer declarer) {

        }
    }

    public static void main(String[] args){

        TopologyBuilder builder = new TopologyBuilder();
        builder.setSpout("DataSourceSpout", new DataSourceSpout());
        builder.setBolt("SplitBolt", new SplitBolt()).shuffleGrouping("DataSourceSpout");
        builder.setBolt("CountBolt", new CountBolt()).shuffleGrouping("SplitBolt");

        LocalCluster cluster = new LocalCluster();
        cluster.submitTopology("LocalWordCountStormTopology", new Config(), builder.createTopology());
    }
}

4390

原文 http://www.waitingfy.com/archives/4390

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