external/storm-hbase/src/test/java/org/apache/storm/hbase/topology/LookupWordCount.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.hbase.topology;

import backtype.storm.Config;
import backtype.storm.LocalCluster;
import backtype.storm.StormSubmitter;
import backtype.storm.topology.TopologyBuilder;
import backtype.storm.tuple.Fields;
import org.apache.storm.hbase.bolt.HBaseLookupBolt;
import org.apache.storm.hbase.bolt.mapper.HBaseProjectionCriteria;
import org.apache.storm.hbase.bolt.mapper.SimpleHBaseMapper;

import java.util.HashMap;
import java.util.Map;


public class LookupWordCount {
    private static final String WORD_SPOUT = "WORD_SPOUT";
    private static final String LOOKUP_BOLT = "LOOKUP_BOLT";
    private static final String TOTAL_COUNT_BOLT = "TOTAL_COUNT_BOLT";

    public static void main(String[] args) throws Exception {
        Config config = new Config();

        Map<String, Object> hbConf = new HashMap<String, Object>();
        if(args.length > 0){
            hbConf.put("hbase.rootdir", args[0]);
        }
        config.put("hbase.conf", hbConf);

        WordSpout spout = new WordSpout();
        TotalWordCounter totalBolt = new TotalWordCounter();

        SimpleHBaseMapper mapper = new SimpleHBaseMapper().withRowKeyField("word");
        HBaseProjectionCriteria projectionCriteria = new HBaseProjectionCriteria();
        projectionCriteria.addColumn(new HBaseProjectionCriteria.ColumnMetaData("cf", "count"));

        WordCountValueMapper rowToTupleMapper = new WordCountValueMapper();

        HBaseLookupBolt hBaseLookupBolt = new HBaseLookupBolt("WordCount", mapper, rowToTupleMapper)
                .withConfigKey("hbase.conf")
                .withProjectionCriteria(projectionCriteria);

        //wordspout -> lookupbolt -> totalCountBolt
        TopologyBuilder builder = new TopologyBuilder();
        builder.setSpout(WORD_SPOUT, spout, 1);
        builder.setBolt(LOOKUP_BOLT, hBaseLookupBolt, 1).shuffleGrouping(WORD_SPOUT);
        builder.setBolt(TOTAL_COUNT_BOLT, totalBolt, 1).fieldsGrouping(LOOKUP_BOLT, new Fields("columnName"));

        if (args.length == 1) {
            LocalCluster cluster = new LocalCluster();
            cluster.submitTopology("test", config, builder.createTopology());
            Thread.sleep(30000);
            cluster.killTopology("test");
            cluster.shutdown();
            System.exit(0);
        } else if (args.length == 2) {
            StormSubmitter.submitTopology(args[1], config, builder.createTopology());
        } else{
            System.out.println("Usage: LookupWordCount <hbase.rootdir>");
        }
    }
}