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   /*
    * Copyright 2012 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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.netty.example.proxy;
  
  import io.netty.channel.Channel;
  import io.netty.channel.ChannelFuture;
  import io.netty.channel.ChannelFutureListener;
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.channel.ChannelInboundHandlerAdapter;
  
  public class HexDumpProxyBackendHandler extends ChannelInboundHandlerAdapter {
  
      private final Channel inboundChannel;
  
      public HexDumpProxyBackendHandler(Channel inboundChannel) {
          this.inboundChannel = inboundChannel;
      }
  
      @Override
      public void channelActive(ChannelHandlerContext ctx) {
          if (!inboundChannel.isActive()) {
              HexDumpProxyFrontendHandler.closeOnFlush(ctx.channel());
          } else {
              ctx.read();
          }
      }
  
      @Override
      public void channelRead(final ChannelHandlerContext ctx, Object msg) {
          inboundChannel.writeAndFlush(msg).addListener(new ChannelFutureListener() {
              @Override
              public void operationComplete(ChannelFuture future) {
                  if (future.isSuccess()) {
                      ctx.channel().read();
                  } else {
                      future.channel().close();
                  }
              }
          });
      }
  
      @Override
      public void channelInactive(ChannelHandlerContext ctx) {
          HexDumpProxyFrontendHandler.closeOnFlush(inboundChannel);
      }
  
      @Override
      public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
          cause.printStackTrace();
          HexDumpProxyFrontendHandler.closeOnFlush(ctx.channel());
      }
  }