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1   /*
2    * Copyright 2012 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package io.netty.example.proxy;
17  
18  import io.netty.channel.Channel;
19  import io.netty.channel.ChannelFuture;
20  import io.netty.channel.ChannelFutureListener;
21  import io.netty.channel.ChannelHandlerContext;
22  import io.netty.channel.ChannelInboundHandlerAdapter;
23  
24  public class HexDumpProxyBackendHandler extends ChannelInboundHandlerAdapter {
25  
26      private final Channel inboundChannel;
27  
28      public HexDumpProxyBackendHandler(Channel inboundChannel) {
29          this.inboundChannel = inboundChannel;
30      }
31  
32      @Override
33      public void channelActive(ChannelHandlerContext ctx) {
34          ctx.read();
35      }
36  
37      @Override
38      public void channelRead(final ChannelHandlerContext ctx, Object msg) {
39          inboundChannel.writeAndFlush(msg).addListener(new ChannelFutureListener() {
40              @Override
41              public void operationComplete(ChannelFuture future) {
42                  if (future.isSuccess()) {
43                      ctx.channel().read();
44                  } else {
45                      future.channel().close();
46                  }
47              }
48          });
49      }
50  
51      @Override
52      public void channelInactive(ChannelHandlerContext ctx) {
53          HexDumpProxyFrontendHandler.closeOnFlush(inboundChannel);
54      }
55  
56      @Override
57      public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
58          cause.printStackTrace();
59          HexDumpProxyFrontendHandler.closeOnFlush(ctx.channel());
60      }
61  }