package cn.flightfeather.supervision.infrastructure.test;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.util.CharsetUtil;

@ChannelHandler.Sharable     //⇽---  标记该类的实例可以被多个Channel共享
public class EchoClientHandler extends
        SimpleChannelInboundHandler<ByteBuf> {
	@Override
	public void channelActive(ChannelHandlerContext ctx) {
		ctx.writeAndFlush(Unpooled.copiedBuffer("Netty rocks!",     //⇽---  当被通知Channel是活跃的时候，发送一条消息
				CharsetUtil.UTF_8));
	}

	@Override
	public void channelRead0(ChannelHandlerContext ctx, ByteBuf in) {
		System.out.println(    //⇽---  记录已接收消息的转储
		"Client received: " + in.toString(CharsetUtil.UTF_8));
	}

	@Override
	public void exceptionCaught(ChannelHandlerContext ctx,     //⇽---  在发生异常时，记录错误并关闭Channel
                                Throwable cause) {
		cause.printStackTrace();
		ctx.close();
	}
}