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 backtype.storm.coordination;
  
  import backtype.storm.coordination.CoordinatedBolt.FinishedCallback;
  import backtype.storm.coordination.CoordinatedBolt.TimeoutCallback;
  import backtype.storm.task.OutputCollector;
  import backtype.storm.task.TopologyContext;
  import backtype.storm.topology.FailedException;
  import backtype.storm.topology.IRichBolt;
  import backtype.storm.topology.OutputFieldsDeclarer;
  import backtype.storm.tuple.Tuple;
  import backtype.storm.utils.Utils;
  import java.util.HashMap;
  import java.util.Map;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class BatchBoltExecutor implements IRichBolt, FinishedCallback, TimeoutCallback {
      public static Logger LOG = LoggerFactory.getLogger(BatchBoltExecutor.class);
  
      byte[] _boltSer;
      Map<Object, IBatchBolt> _openTransactions;
      Map _conf;
      TopologyContext _context;
      BatchOutputCollectorImpl _collector;
  
      public BatchBoltExecutor(IBatchBolt bolt) {
          _boltSer = Utils.javaSerialize(bolt);
      }
  
      @Override
      public void prepare(Map conf, TopologyContext context, OutputCollector collector) {
          _conf = conf;
          _context = context;
          _collector = new BatchOutputCollectorImpl(collector);
          _openTransactions = new HashMap<>();
      }
  
      @Override
      public void execute(Tuple input) {
          Object id = input.getValue(0);
          IBatchBolt bolt = getBatchBolt(id);
          try {
              bolt.execute(input);
              _collector.ack(input);
          } catch (FailedException e) {
              LOG.error("Failed to process tuple in batch", e);
              _collector.fail(input);
          }
      }
  
      @Override
      public void cleanup() {
      }
  
      @Override
      public void finishedId(Object id) {
          IBatchBolt bolt = getBatchBolt(id);
          _openTransactions.remove(id);
          bolt.finishBatch();
      }
  
      @Override
      public void timeoutId(Object attempt) {
          _openTransactions.remove(attempt);
      }
  
      @Override
      public void declareOutputFields(OutputFieldsDeclarer declarer) {
          newTransactionalBolt().declareOutputFields(declarer);
      }
  
      @Override
      public Map<String, Object> getComponentConfiguration() {
          return newTransactionalBolt().getComponentConfiguration();
      }
  
      private IBatchBolt getBatchBolt(Object id) {
          IBatchBolt bolt = _openTransactions.get(id);
          if (bolt == null) {
              bolt = newTransactionalBolt();
              bolt.prepare(_conf, _context, _collector, id);
              _openTransactions.put(id, bolt);
          }
          return bolt;
      }
  
      private IBatchBolt newTransactionalBolt() {
          return Utils.javaDeserialize(_boltSer, IBatchBolt.class);
      }
  }
  