content: /*
   *
   *  * Copyright 2020 Alibaba Group Holding Limited.
   *  *
   *  * Licensed 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 io.grpc.netty;
  
  import com.alibaba.graphscope.gremlin.Utils;
  
  import io.grpc.internal.ClientTransport;
  import io.netty.channel.Channel;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  public class NettyUtils {
      public static @Nullable Channel getNettyChannel(ClientTransport transport) {
          if (transport instanceof NettyClientTransport) {
              NettyClientTransport nettyClientTransport = (NettyClientTransport) transport;
              // Access the Netty Channel from NettyClientTransport
              return Utils.getFieldValue(NettyClientTransport.class, nettyClientTransport, "channel");
          }
          return null;
      }
  }
  