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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.util.SelfSignedCertificate;
31  
32  /**
33   * Echoes back any received data from a client.
34   */
35  public final class EchoServer {
36  
37      static final boolean SSL = System.getProperty("ssl") != null;
38      static final int PORT = Integer.parseInt(System.getProperty("port", "8007"));
39  
40      public static void main(String[] args) throws Exception {
41          // Configure SSL.
42          final SslContext sslCtx;
43          if (SSL) {
44              SelfSignedCertificate ssc = new SelfSignedCertificate();
45              sslCtx = SslContext.newServerContext(ssc.certificate(), ssc.privateKey());
46          } else {
47              sslCtx = null;
48          }
49  
50          // Configure the server.
51          EventLoopGroup bossGroup = new NioEventLoopGroup(1);
52          EventLoopGroup workerGroup = new NioEventLoopGroup();
53          try {
54              ServerBootstrap b = new ServerBootstrap();
55              b.group(bossGroup, workerGroup)
56               .channel(NioServerSocketChannel.class)
57               .option(ChannelOption.SO_BACKLOG, 100)
58               .handler(new LoggingHandler(LogLevel.INFO))
59               .childHandler(new ChannelInitializer<SocketChannel>() {
60                   @Override
61                   public void initChannel(SocketChannel ch) throws Exception {
62                       ChannelPipeline p = ch.pipeline();
63                       if (sslCtx != null) {
64                           p.addLast(sslCtx.newHandler(ch.alloc()));
65                       }
66                       //p.addLast(new LoggingHandler(LogLevel.INFO));
67                       p.addLast(new EchoServerHandler());
68                   }
69               });
70  
71              // Start the server.
72              ChannelFuture f = b.bind(PORT).sync();
73  
74              // Wait until the server socket is closed.
75              f.channel().closeFuture().sync();
76          } finally {
77              // Shut down all event loops to terminate all threads.
78              bossGroup.shutdownGracefully();
79              workerGroup.shutdownGracefully();
80          }
81      }
82  }