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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.worldclock;
17  
18  import io.netty.bootstrap.ServerBootstrap;
19  import io.netty.channel.EventLoopGroup;
20  import io.netty.channel.nio.NioEventLoopGroup;
21  import io.netty.channel.socket.nio.NioServerSocketChannel;
22  import io.netty.handler.logging.LogLevel;
23  import io.netty.handler.logging.LoggingHandler;
24  import io.netty.handler.ssl.SslContext;
25  import io.netty.handler.ssl.SslContextBuilder;
26  import io.netty.handler.ssl.util.SelfSignedCertificate;
27  
28  /**
29   * Receives a list of continent/city pairs from a {@link WorldClockClient} to
30   * get the local times of the specified cities.
31   */
32  public final class WorldClockServer {
33  
34      static final boolean SSL = System.getProperty("ssl") != null;
35      static final int PORT = Integer.parseInt(System.getProperty("port", "8463"));
36  
37      public static void main(String[] args) throws Exception {
38          // Configure SSL.
39          final SslContext sslCtx;
40          if (SSL) {
41              SelfSignedCertificate ssc = new SelfSignedCertificate();
42              sslCtx = SslContextBuilder.forServer(ssc.certificate(), ssc.privateKey()).build();
43          } else {
44              sslCtx = null;
45          }
46  
47          EventLoopGroup bossGroup = new NioEventLoopGroup(1);
48          EventLoopGroup workerGroup = new NioEventLoopGroup();
49          try {
50              ServerBootstrap b = new ServerBootstrap();
51              b.group(bossGroup, workerGroup)
52               .channel(NioServerSocketChannel.class)
53               .handler(new LoggingHandler(LogLevel.INFO))
54               .childHandler(new WorldClockServerInitializer(sslCtx));
55  
56              b.bind(PORT).sync().channel().closeFuture().sync();
57          } finally {
58              bossGroup.shutdownGracefully();
59              workerGroup.shutdownGracefully();
60          }
61      }
62  }