package cn.flightfeather.supervision.infrastructure.test;

import io.netty.bootstrap.Bootstrap;
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.NioSocketChannel;

import java.net.InetSocketAddress;

public class EchoClient {
	private final String host;
	private final int port;

	public EchoClient(String host, int port) {
		this.host = host;
		this.port = port;
	}

	public void start() throws Exception {
		EventLoopGroup group = new NioEventLoopGroup();
		try {    //⇽---  创建Bootstrap
			Bootstrap b = new Bootstrap();     //⇽---  指定EventLoopGroup以处理客户端事件；需要适用于NIO的实现
			b.group(group)
					.channel(NioSocketChannel.class)     //⇽---  适用于NIO传输的Channel类型
					.remoteAddress(new InetSocketAddress(host, port))     //⇽---  设置服务器的InetSocketAddr-ess![](/api/storage/getbykey/screenshow?key=17043add7e9c14a5d3f7)
					.handler(new ChannelInitializer<SocketChannel>() {    //⇽---  在创建Channel时，向ChannelPipeline中添加一个Echo-ClientHandler实例
						@Override
						public void initChannel(SocketChannel ch)
								throws Exception {
							ch.pipeline().addLast(
									new EchoClientHandler());
						}
					});
			ChannelFuture f = b.connect().sync();     //⇽---  连接到远程节点，阻塞等待直到连接完成
			f.channel().closeFuture().sync();      //⇽---  阻塞，直到Channel关闭
		} finally {
			group.shutdownGracefully().sync();       //⇽---  关闭线程池并且释放所有的资源
		}
	}

	public static void main(String[] args) throws Exception {

		String host = "127.0.0.1";
		int port = Integer.parseInt("10086");
		new EchoClient(host, port).start();
	}
}