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 java.util.concurrent.ConcurrentHashMap;
  import java.util.concurrent.atomic.AtomicReference;
  
  import backtype.storm.messaging.TaskMessage;
  import backtype.storm.serialization.KryoTupleDeserializer;
  import backtype.storm.tuple.Tuple;
  import backtype.storm.utils.Utils;
  import com.alibaba.jstorm.utils.JStormUtils;
  import com.esotericsoftware.kryo.KryoException;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import backtype.storm.messaging.IConnection;
  import backtype.storm.utils.DisruptorQueue;
  
  import com.alibaba.jstorm.utils.DisruptorRunable;
  
  /**
   * control message dispatcher
   *
   * @author JohnFang (xiaojian.fxj@alibaba-inc.com).
   */
  public class VirtualPortCtrlDispatch extends DisruptorRunable {
      private static final Logger LOG = LoggerFactory.getLogger(VirtualPortCtrlDispatch.class);
  
      protected ConcurrentHashMap<Integer, DisruptorQueue> controlQueues;
      protected IConnection recvConnection;
      protected AtomicReference<KryoTupleDeserializer> atomKryoDeserializer;
  
      public VirtualPortCtrlDispatch(WorkerData workerData, IConnection recvConnection,
                                     DisruptorQueue recvQueue, String idStr) {
          super(recvQueue, idStr);
  
          this.recvConnection = recvConnection;
          this.controlQueues = workerData.getControlQueues();
          this.atomKryoDeserializer = workerData.getAtomKryoDeserializer();
      }
  
      public void shutdownRecv() {
          // don't need send shutdown command to every task
          // due to every task has been shutdown by workerData.active
          // at the same time queue has been fulll
          // byte shutdownCmd[] = { TaskStatus.SHUTDOWN };
          // for (DisruptorQueue queue : deserializeQueues.values()) {
          //
          // queue.publish(shutdownCmd);
          // }
  
          try {
              recvConnection.close();
          } catch (Exception ignored) {
          }
          recvConnection = null;
      }
  
      @Override
      public void shutdown() {
          super.shutdown();
          LOG.info("Begin to shutdown VirtualPortCtrlDispatch");
          shutdownRecv();
          LOG.info("Successfully shutdown VirtualPortCtrlDispatch");
      }
  
      @SuppressWarnings("unused")
      protected Object deserialize(byte[] serMsg, int taskId) {
          try {
              if (serMsg == null) {
                  return null;
              }
  
              if (serMsg.length == 0) {
                  return null;
              } else if (serMsg.length == 1) {
                  //ignore
                  return null;
              }
              Tuple tuple = null;
              // serMsg.length > 1
              KryoTupleDeserializer kryo = atomKryoDeserializer.get();
              if (kryo != null) {
                  tuple = kryo.deserialize(serMsg);
              }
              return tuple;
          } catch (Throwable e) {
              if (Utils.exceptionCauseIsInstanceOf(KryoException.class, e))
                  throw new RuntimeException(e);
              LOG.error(idStr + " recv thread error " + JStormUtils.toPrintableString(serMsg) + "\n", e);
          }
          return null;
      }
  
      @Override
      public void handleEvent(Object event, boolean endOfBatch) throws Exception {
          TaskMessage message = (TaskMessage) event;
          int task = message.task();
  
          Object tuple = null;
          try {
              //there might be errors when calling update_topology
              tuple = deserialize(message.message(), task);
          } catch (Throwable e) {
              if (Utils.exceptionCauseIsInstanceOf(KryoException.class, e))
                  throw new RuntimeException(e);
              LOG.warn("serialize msg error", e);
          }
  
          DisruptorQueue queue = controlQueues.get(task);
          if (queue == null) {
              LOG.warn("Received invalid control message for task-{}, Dropping...{} ", task, tuple);
              return;
          }
          if (tuple != null) {
              queue.publish(tuple);
          }
      }
  
  }
  