java - Netty ServerSocket 和子进程正常关闭

Question

我想关闭 Netty 服务器上的服务器套接字，然后等待所有子进程完成处理，然后再执行资源清理。

第 1 步使用此代码等待 Netty 服务器套接字在主线程上关闭，其中 b 是 ServerBootstrap

的实例

b.bind ( getPort ( p ) ).sync ().channel ().closeFuture ().sync ()

第 2 步指示服务器套接字从应用程序中其他位置的不同线程关闭

第 3 步指示所有客户端关闭，我将拥有执行此操作的应用程序代码

第 4 步等待所有客户端套接字关闭，这就是我想知道该怎么做。如何获取所有客户端套接字、服务器子级的列表，然后等待它们全部关闭？

Netty版本4.1.1.Final

我使用以下代码片段设置 Netty 服务器套接字

EventLoopGroup bossGroup = new NioEventLoopGroup ( 1 );
EventLoopGroup workerGroup = new NioEventLoopGroup ( Math.max ( 1, Runtime.getRuntime ().availableProcessors () / 2 ) );
try
{
  ServerBootstrap b = new ServerBootstrap ();
  b.group ( bossGroup, workerGroup )
  .channel ( NioServerSocketChannel.class )
  .childHandler ( new ServerInitializer ( sslctx, jsonIOManager, dispatcherPool, factory ) )
  .childOption ( ChannelOption.TCP_NODELAY, Boolean.TRUE )
  .childOption ( ChannelOption.SO_KEEPALIVE, Boolean.TRUE );

  // wait till server socket is closed    
  b.bind ( getPort ( p ) ).sync ().channel ().closeFuture ().sync ();
  // instruct all clients to shutdown
  dispatcherPool.shutdown ();

  // wait on all sockets that are children of the server socket to close
  // How can i do this?

}
finally
{
  bossGroup.shutdownGracefully ();
  workerGroup.shutdownGracefully ();
}

Answer 1

来自netty 4.x user guide看来只要等到 shutdownGraceively 返回就会等到所有套接字都关闭。

Shutting down a Netty application is usually as simple as shutting down all EventLoopGroups you created via shutdownGracefully(). It returns a Future that notifies you when the EventLoopGroup has been terminated completely and all Channels that belong to the group have been closed.