package example;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;

public class PingPongServer {

  private int port;

  public PingPongServer (int port) {
    this.port = port;
  }

  public void run() throws Exception {
    EventLoopGroup bossGroup = new NioEventLoopGroup();
    EventLoopGroup workerGroup = new NioEventLoopGroup();
    try {
      ServerBootstrap b = new ServerBootstrap();
      ChannelFuture f = b.group (bossGroup, workerGroup)
          .channel (NioServerSocketChannel.class)
          .childHandler (new PingPongChannelInitializer (new PingPongServerHandler ()))
          .option (ChannelOption.SO_BACKLOG, 128)
          .childOption (ChannelOption.SO_KEEPALIVE, true)
          .bind (port) .sync ();
      f.channel().closeFuture().sync();
    } finally {
      workerGroup.shutdownGracefully();
      bossGroup.shutdownGracefully();
    }
  }

  public static void main(String[] args) throws Exception {
    int port;
    if (args.length > 0) {
      port = Integer.parseInt(args[0]);
    } else {
      port = 8080;
    }
    new PingPongServer (port).run();
  }
}