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.daemon.worker;
  
  import backtype.storm.serialization.KryoTupleDeserializer;
  import backtype.storm.task.GeneralTopologyContext;
  import backtype.storm.utils.WorkerClassLoader;
  import com.alibaba.jstorm.callback.AsyncLoopRunnable;
  import com.alibaba.jstorm.callback.RunnableCallback;
  import com.alibaba.jstorm.task.TaskShutdownDameon;
  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 WorkerDeserializeRunnable extends RunnableCallback {
  
      private static Logger LOG = LoggerFactory.getLogger(WorkerDeserializeRunnable.class);
      private volatile List<TaskShutdownDameon> shutdownTasks;
      private int threadIndex;
      private int startRunTaskIndex;
      private KryoTupleDeserializer deserializer;
  
      public WorkerDeserializeRunnable(List<TaskShutdownDameon> shutdownTasks,
                                       Map stormConf,
                                       GeneralTopologyContext topologyContext,
                                       int startRunTaskIndex,
                                       int threadIndex) {
          this.shutdownTasks = shutdownTasks;
          this.threadIndex = threadIndex;
          this.startRunTaskIndex = startRunTaskIndex;
          this.deserializer = new KryoTupleDeserializer(stormConf, topologyContext, topologyContext.getRawTopology());
      }
  
      @Override
      public String getThreadName() {
          return "worker-deserializer-" + threadIndex;
      }
  
      @Override
      public void preRun() {
          WorkerClassLoader.switchThreadContext();
      }
  
      @Override
      public void postRun() {
          WorkerClassLoader.restoreThreadContext();
      }
  
      @Override
      public void run() {
          LOG.info("Successfully started " + getThreadName());
          while (!AsyncLoopRunnable.getShutdown().get()) {
              int loopCount = shutdownTasks.size();
              //note: avoid to cpu idle
              boolean isIdling = true;
              for (int i = 0; i < loopCount; i++) {
                  try {
                      if (startRunTaskIndex >= shutdownTasks.size())
                          startRunTaskIndex = 0;
                      TaskShutdownDameon taskShutdownDameon = shutdownTasks.get(startRunTaskIndex);
                      boolean ret = taskShutdownDameon.getTask().getTaskReceiver().deserializer(deserializer, false);
                      if (!ret) {
                          isIdling = false;
                      }
                      startRunTaskIndex++;
                  } catch (IndexOutOfBoundsException ignored) {
                  }
              }
              if (isIdling) {
                  try {
                      if (startRunTaskIndex >= shutdownTasks.size())
                          startRunTaskIndex = 0;
                      TaskShutdownDameon taskShutdownDameon = shutdownTasks.get(startRunTaskIndex);
                      taskShutdownDameon.getTask().getTaskReceiver().deserializer(deserializer, true);
                      startRunTaskIndex++;
                  } catch (IndexOutOfBoundsException e) {
                      //inore
                  }
              }
          }
      }
  
      public Object getResult() {
          LOG.info("Begin to shutdown " + getThreadName());
          return -1;
      }
  }
  