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