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   /*
    * Copyright 2017 The Netty Project
    *
    * The Netty Project licenses this file to you under the Apache License,
    * version 2.0 (the "License"); you may not use this file except in compliance
    * with the License. You may obtain a copy of the License at:
    *
    *   https://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
   * License for the specific language governing permissions and limitations
   * under the License.
   */
  package io.netty.example.uptime;
  
  import io.netty.bootstrap.ServerBootstrap;
  import io.netty.channel.ChannelFuture;
  import io.netty.channel.ChannelInitializer;
  import io.netty.channel.EventLoopGroup;
  import io.netty.channel.nio.NioEventLoopGroup;
  import io.netty.channel.socket.SocketChannel;
  import io.netty.channel.socket.nio.NioServerSocketChannel;
  import io.netty.handler.logging.LogLevel;
  import io.netty.handler.logging.LoggingHandler;
  
  /**
   * Uptime server is served as a connection server.
   * So it simply discards all message received.
   */
  public final class UptimeServer {
      private static final int PORT = Integer.parseInt(System.getProperty("port", "8080"));
      private static final UptimeServerHandler handler = new UptimeServerHandler();
  
      private UptimeServer() {
      }
  
      public static void main(String[] args) throws Exception {
  
          EventLoopGroup bossGroup = new NioEventLoopGroup(1);
          EventLoopGroup workerGroup = new NioEventLoopGroup();
          try {
              ServerBootstrap b = new ServerBootstrap();
              b.group(bossGroup, workerGroup)
                      .channel(NioServerSocketChannel.class)
                      .handler(new LoggingHandler(LogLevel.INFO))
                      .childHandler(new ChannelInitializer<SocketChannel>() {
                          @Override
                          public void initChannel(SocketChannel ch) {
                              ch.pipeline().addLast(handler);
                          }
                      });
  
              // Bind and start to accept incoming connections.
              ChannelFuture f = b.bind(PORT).sync();
  
              // Wait until the server socket is closed.
              // In this example, this does not happen, but you can do that to gracefully
              // shut down your server.
              f.channel().closeFuture().sync();
          } finally {
              workerGroup.shutdownGracefully();
              bossGroup.shutdownGracefully();
          }
      }
  }