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.deploy;
  
  import backtype.storm.task.OutputCollector;
  import backtype.storm.task.TopologyContext;
  import backtype.storm.topology.OutputFieldsDeclarer;
  import backtype.storm.topology.base.BaseRichBolt;
  import backtype.storm.tuple.Fields;
  import backtype.storm.tuple.Tuple;
  import backtype.storm.tuple.Values;
  import com.alibaba.jstorm.client.ConfigExtension;
  import com.alibaba.jstorm.utils.JStormUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.List;
  import java.util.Map;
  
  /**
   * @author JohnFang (xiaojian.fxj@alibaba-inc.com).
   */
  public class DeployBolt extends BaseRichBolt {
      private final static Logger LOG = LoggerFactory.getLogger(DeployBolt.class);
      private OutputCollector _collector;
      private Map<String, List<Integer>> _sourceTasks;
      private Map<String, List<Integer>> _targetTasks;
      private volatile Integer _expectExcevieNum = 0;
      private Integer timeout;
      private TopologyContext context;
  
      public void prepare(Map conf, TopologyContext context, OutputCollector collector) {
          _collector = collector;
          _sourceTasks = context.getThisSourceComponentTasks();
          _targetTasks = context.getThisTargetComponentTasks();
          for (List<Integer> tasks : _sourceTasks.values()) {
              _expectExcevieNum += tasks.size();
          }
          this.context = context;
          timeout = ConfigExtension.getTaskCleanupTimeoutSec(conf) / 2;
  
          LOG.info("this component's sourceTasks is {}, and the target tasks is {}", _sourceTasks, _targetTasks);
      }
  
      public void execute(Tuple tuple) {
          if (tuple.getValues().size() == 0) {
              _expectExcevieNum--;
          } else {
              JStormUtils.sleepMs(1);
              _collector.emit(tuple, new Values(tuple.getValues()));
              _collector.ack(tuple);
          }
      }
  
      public void cleanup() {
          if (JStormUtils.isKilledStatus(context)){
              long start = System.currentTimeMillis();
  
              while (_expectExcevieNum != 0) {
                  if (_expectExcevieNum < 0) {
                      LOG.warn("_expectExcevieNum can't less than zero");
                      break;
                  }
                  JStormUtils.sleepMs(1);
                  if (System.currentTimeMillis() - start > timeout * 1000) {
                      LOG.warn("timeout, this component still not receive {} finish stream", _expectExcevieNum);
                      break;
                  }
              }
              JStormUtils.sleepMs(10);
              int sendNum = 0;
              for (List<Integer> tasks : _targetTasks.values()) {
                  for (Integer task : tasks) {
                      sendNum++;
                      _collector.emitDirect(task, new Values());
                  }
              }
              _collector.flush();
              LOG.info("this component-{} already sent {} finish messages", context.getThisTaskId(), sendNum);
              JStormUtils.sleepMs(100);
          }
      }
  
      public void declareOutputFields(OutputFieldsDeclarer declarer) {
          declarer.declare(new Fields("message"));
      }
  
  }