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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    *   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.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.MultiThreadIoEventLoopGroup;
23  import io.netty.channel.nio.NioIoHandler;
24  import io.netty.channel.socket.SocketChannel;
25  import io.netty.channel.socket.nio.NioServerSocketChannel;
26  import io.netty.handler.logging.LogLevel;
27  import io.netty.handler.logging.LoggingHandler;
28  
29  /**
30   * Uptime server is served as a connection server.
31   * So it simply discards all message received.
32   */
33  public final class UptimeServer {
34      private static final int PORT = Integer.parseInt(System.getProperty("port", "8080"));
35      private static final UptimeServerHandler handler = new UptimeServerHandler();
36  
37      private UptimeServer() {
38      }
39  
40      public static void main(String[] args) throws Exception {
41  
42          EventLoopGroup bossGroup = new MultiThreadIoEventLoopGroup(1, NioIoHandler.newFactory());
43          EventLoopGroup workerGroup = new MultiThreadIoEventLoopGroup(NioIoHandler.newFactory());
44          try {
45              ServerBootstrap b = new ServerBootstrap();
46              b.group(bossGroup, workerGroup)
47                      .channel(NioServerSocketChannel.class)
48                      .handler(new LoggingHandler(LogLevel.INFO))
49                      .childHandler(new ChannelInitializer<SocketChannel>() {
50                          @Override
51                          public void initChannel(SocketChannel ch) {
52                              ch.pipeline().addLast(handler);
53                          }
54                      });
55  
56              // Bind and start to accept incoming connections.
57              ChannelFuture f = b.bind(PORT).sync();
58  
59              // Wait until the server socket is closed.
60              // In this example, this does not happen, but you can do that to gracefully
61              // shut down your server.
62              f.channel().closeFuture().sync();
63          } finally {
64              workerGroup.shutdownGracefully();
65              bossGroup.shutdownGracefully();
66          }
67      }
68  }