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.concurrent.atomic.AtomicLong;
  
  import org.apache.log4j.Logger;
  
  import backtype.storm.Config;
  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 backtype.storm.utils.TimeCacheMap;
  
  import com.alibaba.jstorm.batch.BatchId;
  import com.alibaba.jstorm.batch.IPrepareCommit;
  import com.alibaba.jstorm.utils.JStormUtils;
  
  public class CountBolt implements IBasicBolt, IPrepareCommit {
  	private static final long serialVersionUID = 5720810158625748042L;
  
  	private static final Logger LOG = Logger.getLogger(CountBolt.class);
  
  	public static final String COUNT_BOLT_NAME = "Count";
  	public static final String SUM_BOLT_NAME = "Sum";
  
  	private Map conf;
  
  	private TimeCacheMap<BatchId, AtomicLong> counters;
  
  	@Override
  	public void prepare(Map stormConf, TopologyContext context) {
  		this.conf = stormConf;
  
  		int timeoutSeconds = JStormUtils.parseInt(
  				conf.get(Config.TOPOLOGY_MESSAGE_TIMEOUT_SECS), 30);
  		counters = new TimeCacheMap<BatchId, AtomicLong>(timeoutSeconds);
  		
  		LOG.info("Successfully do prepare");
  
  	}
  
  	@Override
  	public void execute(Tuple input, BasicOutputCollector collector) {
  		BatchId id = (BatchId) input.getValue(0);
  
  		AtomicLong counter = counters.get(id);
  		if (counter == null) {
  			counter = new AtomicLong(0);
  			counters.put(id, counter);
  		}
  
  		counter.incrementAndGet();
  
  	}
  
  	@Override
  	public void cleanup() {
  		LOG.info("Successfully do cleanup");
  	}
  
  	@Override
  	public void declareOutputFields(OutputFieldsDeclarer declarer) {
  		declarer.declare(new Fields("BatchId", "counters"));
  	}
  
  	@Override
  	public Map<String, Object> getComponentConfiguration() {
  		return null;
  	}
  
  	@Override
  	public void prepareCommit(BatchId id, BasicOutputCollector collector) {
  		AtomicLong counter = (AtomicLong) counters.remove(id);
  		if (counter == null) {
  			counter = new AtomicLong(0);
  		}
  
  		collector.emit(new Values(id, counter.get()));
  	}
  }
  