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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.buffer.Unpooled;
19  import io.netty.channel.Channel;
20  import io.netty.channel.ChannelFuture;
21  import io.netty.channel.ChannelFutureListener;
22  import io.netty.channel.ChannelHandlerAdapter;
23  import io.netty.channel.ChannelHandlerContext;
24  
25  public class HexDumpProxyBackendHandler extends ChannelHandlerAdapter {
26  
27      private final Channel inboundChannel;
28  
29      public HexDumpProxyBackendHandler(Channel inboundChannel) {
30          this.inboundChannel = inboundChannel;
31      }
32  
33      @Override
34      public void channelActive(ChannelHandlerContext ctx) {
35          ctx.read();
36          ctx.write(Unpooled.EMPTY_BUFFER);
37      }
38  
39      @Override
40      public void channelRead(final ChannelHandlerContext ctx, Object msg) {
41          inboundChannel.writeAndFlush(msg).addListener(new ChannelFutureListener() {
42              @Override
43              public void operationComplete(ChannelFuture future) {
44                  if (future.isSuccess()) {
45                      ctx.channel().read();
46                  } else {
47                      future.channel().close();
48                  }
49              }
50          });
51      }
52  
53      @Override
54      public void channelInactive(ChannelHandlerContext ctx) {
55          HexDumpProxyFrontendHandler.closeOnFlush(inboundChannel);
56      }
57  
58      @Override
59      public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
60          cause.printStackTrace();
61          HexDumpProxyFrontendHandler.closeOnFlush(ctx.channel());
62      }
63  }