examples/storm-hbase-examples/src/main/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 java.util.HashMap;
import java.util.Map;
import org.apache.storm.Config;
import org.apache.storm.StormSubmitter;
import org.apache.storm.hbase.bolt.HBaseLookupBolt;
import org.apache.storm.hbase.bolt.mapper.HBaseProjectionCriteria;
import org.apache.storm.hbase.bolt.mapper.SimpleHBaseMapper;
import org.apache.storm.topology.TopologyBuilder;
import org.apache.storm.tuple.Fields;


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();

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

        WordCountValueMapper rowToTupleMapper = new WordCountValueMapper();

        HBaseLookupBolt lookupBolt = 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, lookupBolt, 1).shuffleGrouping(WORD_SPOUT);
        TotalWordCounter totalBolt = new TotalWordCounter();
        builder.setBolt(TOTAL_COUNT_BOLT, totalBolt, 1).fieldsGrouping(LOOKUP_BOLT, new Fields("columnName"));
        String topoName = "test";
        if (args.length == 1) {
            topoName = args[1];
        } else if (args.length > 1) {
            System.out.println("Usage: LookupWordCount <hbase.rootdir>");
            return;
        }

        StormSubmitter.submitTopology(topoName, config, builder.createTopology());
    }
}