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1   /*
2    * Copyright 2017 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.uptime;
17  
18  import io.netty.bootstrap.ServerBootstrap;
19  import io.netty.channel.ChannelFuture;
20  import io.netty.channel.ChannelInitializer;
21  import io.netty.channel.EventLoopGroup;
22  import io.netty.channel.nio.NioEventLoopGroup;
23  import io.netty.channel.socket.SocketChannel;
24  import io.netty.channel.socket.nio.NioServerSocketChannel;
25  import io.netty.handler.logging.LogLevel;
26  import io.netty.handler.logging.LoggingHandler;
27  
28  /**
29   * Uptime server is served as a connection server.
30   * So it simply discards all message received.
31   */
32  public final class UptimeServer {
33      private static final int PORT = Integer.parseInt(System.getProperty("port", "8080"));
34      private static final UptimeServerHandler handler = new UptimeServerHandler();
35  
36      private UptimeServer() {
37      }
38  
39      public static void main(String[] args) throws Exception {
40  
41          EventLoopGroup bossGroup = new NioEventLoopGroup(1);
42          EventLoopGroup workerGroup = new NioEventLoopGroup();
43          try {
44              ServerBootstrap b = new ServerBootstrap();
45              b.group(bossGroup, workerGroup)
46                      .channel(NioServerSocketChannel.class)
47                      .handler(new LoggingHandler(LogLevel.INFO))
48                      .childHandler(new ChannelInitializer<SocketChannel>() {
49                          @Override
50                          public void initChannel(SocketChannel ch) {
51                              ch.pipeline().addLast(handler);
52                          }
53                      });
54  
55              // Bind and start to accept incoming connections.
56              ChannelFuture f = b.bind(PORT).sync();
57  
58              // Wait until the server socket is closed.
59              // In this example, this does not happen, but you can do that to gracefully
60              // shut down your server.
61              f.channel().closeFuture().sync();
62          } finally {
63              workerGroup.shutdownGracefully();
64              bossGroup.shutdownGracefully();
65          }
66      }
67  }