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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.discard;
17  
18  import io.netty.bootstrap.ServerBootstrap;
19  import io.netty.channel.ChannelFuture;
20  import io.netty.channel.ChannelInitializer;
21  import io.netty.channel.ChannelPipeline;
22  import io.netty.channel.EventLoopGroup;
23  import io.netty.channel.nio.NioEventLoopGroup;
24  import io.netty.channel.socket.SocketChannel;
25  import io.netty.channel.socket.nio.NioServerSocketChannel;
26  import io.netty.handler.logging.LogLevel;
27  import io.netty.handler.logging.LoggingHandler;
28  import io.netty.handler.ssl.SslContext;
29  import io.netty.handler.ssl.util.SelfSignedCertificate;
30  
31  /**
32   * Discards any incoming data.
33   */
34  public final class DiscardServer {
35  
36      static final boolean SSL = System.getProperty("ssl") != null;
37      static final int PORT = Integer.parseInt(System.getProperty("port", "8009"));
38  
39      public static void main(String[] args) throws Exception {
40          // Configure SSL.
41          final SslContext sslCtx;
42          if (SSL) {
43              SelfSignedCertificate ssc = new SelfSignedCertificate();
44              sslCtx = SslContext.newServerContext(ssc.certificate(), ssc.privateKey());
45          } else {
46              sslCtx = null;
47          }
48  
49          EventLoopGroup bossGroup = new NioEventLoopGroup(1);
50          EventLoopGroup workerGroup = new NioEventLoopGroup();
51          try {
52              ServerBootstrap b = new ServerBootstrap();
53              b.group(bossGroup, workerGroup)
54               .channel(NioServerSocketChannel.class)
55               .handler(new LoggingHandler(LogLevel.INFO))
56               .childHandler(new ChannelInitializer<SocketChannel>() {
57                   @Override
58                   public void initChannel(SocketChannel ch) {
59                       ChannelPipeline p = ch.pipeline();
60                       if (sslCtx != null) {
61                           p.addLast(sslCtx.newHandler(ch.alloc()));
62                       }
63                       p.addLast(new DiscardServerHandler());
64                   }
65               });
66  
67              // Bind and start to accept incoming connections.
68              ChannelFuture f = b.bind(PORT).sync();
69  
70              // Wait until the server socket is closed.
71              // In this example, this does not happen, but you can do that to gracefully
72              // shut down your server.
73              f.channel().closeFuture().sync();
74          } finally {
75              workerGroup.shutdownGracefully();
76              bossGroup.shutdownGracefully();
77          }
78      }
79  }