content: /**
   * 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 com.alibaba.jstorm.batch.example;
  
  import java.util.Map;
  import java.util.Random;
  
  import org.apache.log4j.Logger;
  
  import backtype.storm.task.TopologyContext;
  import backtype.storm.topology.BasicOutputCollector;
  import backtype.storm.topology.IBasicBolt;
  import backtype.storm.topology.OutputFieldsDeclarer;
  import backtype.storm.tuple.Fields;
  import backtype.storm.tuple.Tuple;
  import backtype.storm.tuple.Values;
  
  import com.alibaba.jstorm.batch.BatchId;
  
  public class TransformBolt implements IBasicBolt {
  	private static final long serialVersionUID = 5720810158625748044L;
  
  	private static final Logger LOG = Logger.getLogger(TransformBolt.class);
  
  	public static final String BOLT_NAME = TransformBolt.class.getSimpleName();
  
  	private Map conf;
  
  	private Random rand;
  
  	@Override
  	public void prepare(Map stormConf, TopologyContext context) {
  		this.conf = stormConf;
  		this.rand = new Random();
  		rand.setSeed(System.currentTimeMillis());
  		
  		LOG.info("Successfully do prepare");
  	}
  
  	@Override
  	public void execute(Tuple input, BasicOutputCollector collector) {
  		BatchId id = (BatchId) input.getValue(0);
  
  		long value = rand.nextInt(100);
  
  		collector.emit(new Values(id, value));
  
  	}
  
  	@Override
  	public void cleanup() {
  		LOG.info("Successfully do cleanup");
  	}
  
  	@Override
  	public void declareOutputFields(OutputFieldsDeclarer declarer) {
  		declarer.declare(new Fields("BatchId", "Value"));
  	}
  
  	@Override
  	public Map<String, Object> getComponentConfiguration() {
  		return null;
  	}
  
  }
  