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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.telnet;
17  
18  import io.netty.channel.ChannelInitializer;
19  import io.netty.channel.ChannelPipeline;
20  import io.netty.channel.socket.SocketChannel;
21  import io.netty.handler.codec.DelimiterBasedFrameDecoder;
22  import io.netty.handler.codec.Delimiters;
23  import io.netty.handler.codec.string.StringDecoder;
24  import io.netty.handler.codec.string.StringEncoder;
25  import io.netty.handler.ssl.SslContext;
26  
27  /**
28   * Creates a newly configured {@link ChannelPipeline} for a new channel.
29   */
30  public class TelnetClientInitializer extends ChannelInitializer<SocketChannel> {
31  
32      private static final StringDecoder DECODER = new StringDecoder();
33      private static final StringEncoder ENCODER = new StringEncoder();
34  
35      private static final TelnetClientHandler CLIENT_HANDLER = new TelnetClientHandler();
36  
37      private final SslContext sslCtx;
38  
39      public TelnetClientInitializer(SslContext sslCtx) {
40          this.sslCtx = sslCtx;
41      }
42  
43      @Override
44      public void initChannel(SocketChannel ch) {
45          ChannelPipeline pipeline = ch.pipeline();
46  
47          if (sslCtx != null) {
48              pipeline.addLast(sslCtx.newHandler(ch.alloc(), TelnetClient.HOST, TelnetClient.PORT));
49          }
50  
51          // Add the text line codec combination first,
52          pipeline.addLast(new DelimiterBasedFrameDecoder(8192, Delimiters.lineDelimiter()));
53          pipeline.addLast(DECODER);
54          pipeline.addLast(ENCODER);
55  
56          // and then business logic.
57          pipeline.addLast(CLIENT_HANDLER);
58      }
59  }