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.alipay.dw.jstorm.example.batch;
  
  import backtype.storm.task.TopologyContext;
  import backtype.storm.topology.BasicOutputCollector;
  import backtype.storm.topology.FailedException;
  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;
  import com.alibaba.jstorm.batch.IBatchSpout;
  import java.util.Map;
  import java.util.Random;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class SimpleSpout implements IBatchSpout {
      private static final Logger LOG       = LoggerFactory.getLogger(SimpleSpout.class);
      private Random              rand;
      private int                 batchSize = 100;
      
      @Override
      public void prepare(Map stormConf, TopologyContext context) {
          rand = new Random();
          rand.setSeed(System.currentTimeMillis());
      }
      
      @Override
      public void execute(Tuple input, BasicOutputCollector collector) {
          BatchId batchId = (BatchId) input.getValue(0);
          
          for (int i = 0; i < batchSize; i++) {
              long value = rand.nextInt(10);
              collector.emit(new Values(batchId, value));
          }
      }
      
      @Override
      public void cleanup() {
      }
      
      @Override
      public void declareOutputFields(OutputFieldsDeclarer declarer) {
          declarer.declare(new Fields("BatchId", "Value"));
      }
      
      @Override
      public Map<String, Object> getComponentConfiguration() {
          return null;
      }
      
      @Override
      public byte[] commit(BatchId id) throws FailedException {
          LOG.info("Receive BatchId " + id);
          return null;
      }
      
      @Override
      public void revert(BatchId id, byte[] commitResult) {
          LOG.info("Receive BatchId " + id);
      }
      
  }
  