Storm1.1.0

1.温故而知新，使用词频统计实现TopN，以下是使用到的依赖：

<dependencies>
        <dependency>
            <groupId>org.apache.stormgroupId>
            <artifactId>storm-coreartifactId>
            <version>1.1.0version>
            
        dependency>
        <dependency>
            <groupId>org.apache.stormgroupId>
            <artifactId>storm-hbaseartifactId>
            <version>1.1.0version>
        dependency>
        <dependency>
            <groupId>org.apache.hadoopgroupId>
            <artifactId>hadoop-clientartifactId>
            <version>2.7.3version>
            <exclusions>
                <exclusion>
                    <groupId>org.slf4jgroupId>
                    <artifactId>slf4j-log4j12artifactId>
                exclusion>
                <exclusion>
                    <groupId>org.slf4jgroupId>
                    <artifactId>slf4j-apiartifactId>
                exclusion>
            exclusions>
        dependency>
        <dependency>
            <groupId>org.apache.zookeepergroupId>
            <artifactId>zookeeperartifactId>
            <version>3.4.6version>
            <exclusions>
                <exclusion>
                    <groupId>org.slf4jgroupId>
                    <artifactId>slf4j-log4j12artifactId>
                exclusion>
                <exclusion>
                    <groupId>org.slf4jgroupId>
                    <artifactId>slf4j-apiartifactId>
                exclusion>
            exclusions>
        dependency>
    dependencies>

2.代码实现

import org.apache.hadoop.hbase.client.Durability;
import org.apache.storm.Config;
import org.apache.storm.LocalCluster;
import org.apache.storm.StormSubmitter;
import org.apache.storm.generated.AlreadyAliveException;
import org.apache.storm.generated.AuthorizationException;
import org.apache.storm.generated.InvalidTopologyException;
import org.apache.storm.hbase.trident.mapper.SimpleTridentHBaseMapper;
import org.apache.storm.hbase.trident.mapper.TridentHBaseMapper;
import org.apache.storm.hbase.trident.state.HBaseState;
import org.apache.storm.hbase.trident.state.HBaseStateFactory;
import org.apache.storm.hbase.trident.state.HBaseUpdater;
import org.apache.storm.topology.base.BaseWindowedBolt;
import org.apache.storm.trident.TridentTopology;
import org.apache.storm.trident.operation.BaseAggregator;
import org.apache.storm.trident.operation.BaseFunction;
import org.apache.storm.trident.operation.FlatMapFunction;
import org.apache.storm.trident.operation.TridentCollector;
import org.apache.storm.trident.state.StateFactory;
import org.apache.storm.trident.testing.FixedBatchSpout;
import org.apache.storm.trident.tuple.TridentTuple;
import org.apache.storm.trident.windowing.config.SlidingDurationWindow;
import org.apache.storm.trident.windowing.config.WindowConfig;
import org.apache.storm.tuple.Fields;
import org.apache.storm.tuple.Values;

import java.util.*;
import java.util.concurrent.TimeUnit;

public class TopNTopology {
    private static class TopNFunction extends BaseFunction {
        private int TOPN;

        public TopNFunction(int n) {
            this.TOPN = n;
        }

        @Override
        public void execute(TridentTuple tuple, TridentCollector collector) {
            HashMap hashMap = (HashMap) tuple.get(0);
            List.Entry> list = new ArrayList<>(hashMap.entrySet());
            Collections.sort(list, new Comparator.Entry>() {
                @Override
                public int compare(Map.Entry o1, Map.Entry o2) {
                    return o1.getValue().compareTo(o2.getValue());
                }
            });
            int i = 1;
            for (int j = list.size() - 1; j >= 0; j--) {
                if (i > TOPN)
                    break;
                collector.emit(new Values(String.valueOf(i), list.get(j).getKey(), String.valueOf(list.get(j).getValue())));
                System.out.println("Sending:  " + i + "  " + list.get(j).getKey() + ": " + list.get(j).getValue());
                i++;
            }
            System.out.println("----------------done----------------------");
        }
    }

    private static class SplitFunction implements FlatMapFunction {
        @Override
        public Iterable execute(TridentTuple input) {
            ArrayList values = new ArrayList<>();
            String sentence = input.getStringByField("sentence");
            String[] split = sentence.split(" ");
            for (String s : split) {
                values.add(new Values(s));
            }
            return values;
        }
    }

    private static class WordAggregator extends BaseAggregator> {

        @Override
        public HashMap init(Object batchId, TridentCollector collector) {
            return new HashMap<>();
        }

        @Override
        public void aggregate(HashMap val, TridentTuple tuple, TridentCollector collector) {
            String word = tuple.getStringByField("word");
            long count = 1;
            if (val.containsKey(word))
                count += val.get(word);
            val.put(word, count);
        }

        @Override
        public void complete(HashMap val, TridentCollector collector) {
            collector.emit(new Values(val));
        }
    }

    public static void main(String[] args) throws InvalidTopologyException, AuthorizationException, AlreadyAliveException {
        FixedBatchSpout spout = new FixedBatchSpout(new Fields("sentence"), 3,
                new Values("the cow jumped over the moon"),
                new Values("the man went to the store and bought some candy"),
                new Values("four score and seven years ago"),
                new Values("how many apples can you eat"),
                new Values("to be or not to be the person"));
        spout.setCycle(true);

        TridentHBaseMapper tridentHBaseMapper = new SimpleTridentHBaseMapper()
                .withColumnFamily("result")
                .withColumnFields(new Fields("word", "count"))
                .withRowKeyField("rank");

        HBaseState.Options options = new HBaseState.Options()
                .withConfigKey("hbase")
                .withDurability(Durability.SYNC_WAL)
                .withMapper(tridentHBaseMapper)
                .withTableName("Top5Count");
        StateFactory hBaseStateFactory = new HBaseStateFactory(options);
        WindowConfig durationWindow = SlidingDurationWindow.of(BaseWindowedBolt.Duration.seconds(10), BaseWindowedBolt.Duration.seconds(5));
        TridentTopology topology = new TridentTopology();
        topology.newStream("fixedSpout", spout)
                .flatMap(new SplitFunction(), new Fields("word"))
                .window(durationWindow, new Fields("word"), new WordAggregator(), new Fields("wordcount"))
                .each(new Fields("wordcount"), new TopNFunction(5), new Fields("rank", "word", "count"))
                .partitionPersist(hBaseStateFactory, new Fields("rank", "word", "count"), new HBaseUpdater(), new Fields());

        Config conf = new Config();
        conf.put("hbase", new HashMap());
        if (args.length == 0) {
            LocalCluster cluster = new LocalCluster();
            cluster.submitTopology("Top5Topology", conf, topology.build());
        } else {
            conf.setNumWorkers(3);
            StormSubmitter.submitTopologyWithProgressBar(args[0], conf, topology.build());
        }
    }
}