package io.jpower.kcp.example.rtt; import io.netty.bootstrap.ServerBootstrap; import io.netty.channel.ChannelFuture; import io.netty.channel.ChannelInitializer; import io.netty.channel.ChannelOption; import io.netty.channel.ChannelPipeline; import io.netty.channel.EventLoopGroup; import io.netty.channel.nio.NioEventLoopGroup; import io.netty.channel.socket.SocketChannel; import io.netty.channel.socket.nio.NioServerSocketChannel; /** * Measures RTT(Round-trip time) for TCP. * <p> * Receives a message from client and sends a response. * * @author <a href="mailto:[email protected]">szh</a> */ public class TcpRttServer { static final int PORT = Integer.parseInt(System.getProperty("port", "8009")); public static void main(String[] args) throws Exception { // Configure the server. EventLoopGroup group = new NioEventLoopGroup(); try { ServerBootstrap b = new ServerBootstrap(); b.group(group) .channel(NioServerSocketChannel.class) .childHandler(new ChannelInitializer<SocketChannel>() { @Override public void initChannel(SocketChannel ch) throws Exception { ChannelPipeline p = ch.pipeline(); p.addLast(new TcpRttDecoder()) .addLast(new TcpRttServerHandler()); } }).childOption(ChannelOption.TCP_NODELAY, true); // Start the server. ChannelFuture f = b.bind(PORT).sync(); // Wait until the server socket is closed. f.channel().closeFuture().sync(); } finally { // Shut down all event loops to terminate all threads. group.shutdownGracefully(); } } }