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   /*
    * Copyright 2020 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.stomp.websocket;
  
  import io.netty.bootstrap.ServerBootstrap;
  import io.netty.channel.ChannelFuture;
  import io.netty.channel.ChannelFutureListener;
  import io.netty.channel.nio.NioEventLoopGroup;
  import io.netty.channel.socket.nio.NioServerSocketChannel;
  
  public class StompWebSocketChatServer {
  
      static final int PORT = Integer.parseInt(System.getProperty("port", "8080"));
  
      public void start(final int port) throws Exception {
          NioEventLoopGroup boosGroup = new NioEventLoopGroup(1);
          NioEventLoopGroup workerGroup = new NioEventLoopGroup();
          try {
              ServerBootstrap bootstrap = new ServerBootstrap()
                      .group(boosGroup, workerGroup)
                      .channel(NioServerSocketChannel.class)
                      .childHandler(new StompWebSocketChatServerInitializer("/chat"));
              bootstrap.bind(port).addListener(new ChannelFutureListener() {
                  @Override
                  public void operationComplete(ChannelFuture future) {
                      if (future.isSuccess()) {
                          System.out.println("Open your web browser and navigate to http://127.0.0.1:" + PORT + '/');
                      } else {
                          System.out.println("Cannot start server, follows exception " + future.cause());
                      }
                  }
              }).channel().closeFuture().sync();
          } finally {
              boosGroup.shutdownGracefully();
              workerGroup.shutdownGracefully();
          }
      }
  
      public static void main(String[] args) throws Exception {
          new StompWebSocketChatServer().start(PORT);
      }
  }