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