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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.echo;
17  
18  import io.netty.bootstrap.ServerBootstrap;
19  import io.netty.channel.ChannelFuture;
20  import io.netty.channel.ChannelInitializer;
21  import io.netty.channel.ChannelOption;
22  import io.netty.channel.ChannelPipeline;
23  import io.netty.channel.EventLoopGroup;
24  import io.netty.channel.nio.NioEventLoopGroup;
25  import io.netty.channel.socket.SocketChannel;
26  import io.netty.channel.socket.nio.NioServerSocketChannel;
27  import io.netty.handler.logging.LogLevel;
28  import io.netty.handler.logging.LoggingHandler;
29  import io.netty.handler.ssl.SslContext;
30  import io.netty.handler.ssl.SslContextBuilder;
31  import io.netty.handler.ssl.util.SelfSignedCertificate;
32  
33  /**
34   * Echoes back any received data from a client.
35   */
36  public final class EchoServer {
37  
38      static final boolean SSL = System.getProperty("ssl") != null;
39      static final int PORT = Integer.parseInt(System.getProperty("port", "8007"));
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          // Configure the server.
52          EventLoopGroup bossGroup = new NioEventLoopGroup(1);
53          EventLoopGroup workerGroup = new NioEventLoopGroup();
54          try {
55              ServerBootstrap b = new ServerBootstrap();
56              b.group(bossGroup, workerGroup)
57               .channel(NioServerSocketChannel.class)
58               .option(ChannelOption.SO_BACKLOG, 100)
59               .handler(new LoggingHandler(LogLevel.INFO))
60               .childHandler(new ChannelInitializer<SocketChannel>() {
61                   @Override
62                   public void initChannel(SocketChannel ch) throws Exception {
63                       ChannelPipeline p = ch.pipeline();
64                       if (sslCtx != null) {
65                           p.addLast(sslCtx.newHandler(ch.alloc()));
66                       }
67                       //p.addLast(new LoggingHandler(LogLevel.INFO));
68                       p.addLast(new EchoServerHandler());
69                   }
70               });
71  
72              // Start the server.
73              ChannelFuture f = b.bind(PORT).sync();
74  
75              // Wait until the server socket is closed.
76              f.channel().closeFuture().sync();
77          } finally {
78              // Shut down all event loops to terminate all threads.
79              bossGroup.shutdownGracefully();
80              workerGroup.shutdownGracefully();
81          }
82      }
83  }