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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.netty5.example.discard;
17  
18  import io.netty5.bootstrap.ServerBootstrap;
19  import io.netty5.channel.Channel;
20  import io.netty5.channel.ChannelInitializer;
21  import io.netty5.channel.ChannelPipeline;
22  import io.netty5.channel.EventLoopGroup;
23  import io.netty5.channel.MultithreadEventLoopGroup;
24  import io.netty5.channel.nio.NioHandler;
25  import io.netty5.channel.socket.SocketChannel;
26  import io.netty5.channel.socket.nio.NioServerSocketChannel;
27  import io.netty5.handler.logging.LogLevel;
28  import io.netty5.handler.logging.LoggingHandler;
29  import io.netty5.handler.ssl.SslContext;
30  import io.netty5.handler.ssl.SslContextBuilder;
31  import io.netty5.handler.ssl.util.SelfSignedCertificate;
32  
33  /**
34   * Discards any incoming data.
35   */
36  public final class DiscardServer {
37  
38      static final boolean SSL = System.getProperty("ssl") != null;
39      static final int PORT = Integer.parseInt(System.getProperty("port", "8009"));
40  
41      public static void main(String[] args) throws Exception {
42          // Configure SSL.
43          final SslContext sslCtx;
44          if (SSL) {
45              SelfSignedCertificate ssc = new SelfSignedCertificate();
46              sslCtx = SslContextBuilder.forServer(ssc.certificate(), ssc.privateKey()).build();
47          } else {
48              sslCtx = null;
49          }
50  
51          EventLoopGroup bossGroup = new MultithreadEventLoopGroup(1, NioHandler.newFactory());
52          EventLoopGroup workerGroup = new MultithreadEventLoopGroup(NioHandler.newFactory());
53          try {
54              ServerBootstrap b = new ServerBootstrap();
55              b.group(bossGroup, workerGroup)
56               .channel(NioServerSocketChannel.class)
57               .handler(new LoggingHandler(LogLevel.INFO))
58               .childHandler(new ChannelInitializer<SocketChannel>() {
59                   @Override
60                   public void initChannel(SocketChannel ch) {
61                       ChannelPipeline p = ch.pipeline();
62                       if (sslCtx != null) {
63                           p.addLast(sslCtx.newHandler(ch.bufferAllocator()));
64                       }
65                       p.addLast(new DiscardServerHandler());
66                   }
67               });
68  
69              // Bind and start to accept incoming connections.
70              Channel channel = b.bind(PORT).asStage().get();
71  
72              // Wait until the server socket is closed.
73              // In this example, this does not happen, but you can do that to gracefully
74              // shut down your server.
75              channel.closeFuture().asStage().sync();
76          } finally {
77              workerGroup.shutdownGracefully();
78              bossGroup.shutdownGracefully();
79          }
80      }
81  }