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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.factorial;
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.compression.ZlibCodecFactory;
22  import io.netty.handler.codec.compression.ZlibWrapper;
23  import io.netty.handler.ssl.SslContext;
24  
25  /**
26   * Creates a newly configured {@link ChannelPipeline} for a server-side channel.
27   */
28  public class FactorialServerInitializer extends ChannelInitializer<SocketChannel> {
29  
30      private final SslContext sslCtx;
31  
32      public FactorialServerInitializer(SslContext sslCtx) {
33          this.sslCtx = sslCtx;
34      }
35  
36      @Override
37      public void initChannel(SocketChannel ch) {
38          ChannelPipeline pipeline = ch.pipeline();
39  
40          if (sslCtx != null) {
41              pipeline.addLast(sslCtx.newHandler(ch.alloc()));
42          }
43  
44          // Enable stream compression (you can remove these two if unnecessary)
45          pipeline.addLast(ZlibCodecFactory.newZlibEncoder(ZlibWrapper.GZIP));
46          pipeline.addLast(ZlibCodecFactory.newZlibDecoder(ZlibWrapper.GZIP));
47  
48          // Add the number codec first,
49          pipeline.addLast(new BigIntegerDecoder());
50          pipeline.addLast(new NumberEncoder());
51  
52          // and then business logic.
53          // Please note we create a handler for every new channel
54          // because it has stateful properties.
55          pipeline.addLast(new FactorialServerHandler());
56      }
57  }