统计Metric

package com.example.mail;

import org.apache.storm.Config;
import org.apache.storm.LocalCluster;
import org.apache.storm.StormSubmitter;
import org.apache.storm.metric.LoggingMetricsConsumer;
import com.example.mail.TestWordSpout;
import org.apache.storm.topology.TopologyBuilder;
import org.apache.storm.utils.Utils;

public class ExclamationTopology {
  public static void main(String[] args) throws Exception {
    TopologyBuilder builder = new TopologyBuilder();
    builder.setSpout("word", new TestWordSpout());
    builder.setBolt("exclaim1", new ExclamationBolt()).shuffleGrouping("word");
    //builder.setBolt("exclaim2", new ExclamationBolt()).shuffleGrouping("exclaim1");
    Config conf = new Config();
    conf.setDebug(true);
    //输出统计指标值到日志文件中
     conf.registerMetricsConsumer(LoggingMetricsConsumer.class);
    if (args != null && args.length > 0) {
      conf.setNumWorkers(3);
      StormSubmitter.submitTopology(args[0], conf, builder.createTopology());
    }
    else {
      LocalCluster cluster = new LocalCluster();
      cluster.submitTopology("test", conf, builder.createTopology());
      Utils.sleep(100000);
      cluster.killTopology("test");
      cluster.shutdown();
    }
  }
}

package com.example.mail;

import org.apache.storm.Config;
import org.apache.storm.topology.OutputFieldsDeclarer;
import java.util.Map;
import org.apache.storm.spout.SpoutOutputCollector;
import org.apache.storm.task.TopologyContext;
import org.apache.storm.topology.base.BaseRichSpout;
import org.apache.storm.tuple.Fields;
import org.apache.storm.tuple.Values;
import org.apache.storm.utils.Utils;
import java.util.HashMap;
import java.util.Random;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class TestWordSpout extends BaseRichSpout {
    public static Logger LOG = LoggerFactory.getLogger(TestWordSpout.class);
    boolean _isDistributed;
    SpoutOutputCollector _collector;

    public TestWordSpout() {
        this(true);
    }

    public TestWordSpout(boolean isDistributed) {
        _isDistributed = isDistributed;
    }

    public void open(Map conf, TopologyContext context, SpoutOutputCollector collector) {
        _collector = collector;
    }

    public void close() {

    }

    public void nextTuple() {
        Utils.sleep(1000);
        final String[] words = new String[] {"a", "b", "c", "d", "e"};
        final Random rand = new Random();
        final String word = words[rand.nextInt(words.length)];
        _collector.emit(new Values(word));
    }

    public void ack(Object msgId) {

    }

    public void fail(Object msgId) {

    }

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

   /* @Override
    public Map<String, Object> getComponentConfiguration() {
        if(!_isDistributed) {
            Map<String, Object> ret = new HashMap<String, Object>();
            ret.put(Config.TOPOLOGY_MAX_TASK_PARALLELISM, 1);
            return ret;
        } else {
            return null;
        }
    }    */
}

package com.example.mail;

import java.util.Map;

import org.apache.storm.metric.api.CountMetric;
import org.apache.storm.metric.api.MeanReducer;
import org.apache.storm.metric.api.MultiCountMetric;
import org.apache.storm.metric.api.ReducedMetric;
import org.apache.storm.task.OutputCollector;
import org.apache.storm.task.TopologyContext;
import org.apache.storm.topology.OutputFieldsDeclarer;
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;

public class ExclamationBolt extends BaseRichBolt {
  OutputCollector _collector;
  //定义指标统计对象
   transient CountMetric _countMetric;
   transient MultiCountMetric _wordCountMetric;
   //transient ReducedMetric _wordLengthMeanMetric;
   @Override
   public void prepare(Map conf, TopologyContext context, OutputCollector collector) {
     _collector = collector;
     initMetrics(context);
   }
   @Override
   public void execute(Tuple tuple) {
     _collector.emit(tuple, new Values(tuple.getString(0) + "!!!"));
     _collector.ack(tuple);
       updateMetrics(tuple.getString(0));
   }

   @Override
   public void declareOutputFields(OutputFieldsDeclarer declarer) {
     declarer.declare(new Fields("word"));
   }
   //初始化计数器
     void initMetrics(TopologyContext context)
     {
         _countMetric = new CountMetric();
         _wordCountMetric = new MultiCountMetric();
         //_wordLengthMeanMetric = new ReducedMetric(new MeanReducer());
         context.registerMetric("execute_count", _countMetric, 5);
         context.registerMetric("word_count", _wordCountMetric, 10);
         //context.registerMetric("word_length", _wordLengthMeanMetric, 60);
     }

   //更新计数器
     void updateMetrics(String word)
     {
         _countMetric.incr();
         _wordCountMetric.scope(word).incr();
         //_wordLengthMeanMetric.update(word.length());
     }
}