Netty从入门到精通——实例（四）空闲状态

MyServer

package com.icss.heartbeat;

import com.icss.chat.MyChatServerInitialiter;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;

public class Myserver {
    public static void main(String[] args) throws  Exception{
        EventLoopGroup bossGroup = new NioEventLoopGroup();
        EventLoopGroup workerGroup = new NioEventLoopGroup();
        try {
            ServerBootstrap serverBootstrap = new ServerBootstrap();
            serverBootstrap.group(bossGroup, workerGroup).channel(NioServerSocketChannel.class)
                  .handler(new LoggingHandler(LogLevel.INFO)).childHandler(new MyServerInitializer());
            ChannelFuture channelFuture = serverBootstrap.bind(8899).sync();
            channelFuture.channel().closeFuture().sync();
        } finally {
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }
    }
}

MyServerInitializer

package com.icss.heartbeat;

import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.timeout.IdleStateHandler;

import java.util.concurrent.TimeUnit;

public class MyServerInitializer extends ChannelInitializer<SocketChannel> {
    @Override
    protected void initChannel(SocketChannel ch) throws Exception {
        ChannelPipeline pipeline = ch.pipeline();
        //空闲状态检测Handler (will be triggered when neither read nor write was performed for
        //the specified period of time)(read，write，readAndwriter)
        pipeline.addLast(new IdleStateHandler(5,7,10, TimeUnit.SECONDS));
        pipeline.addLast(new MyServerHandler());
    }
}

MyServerHandler

package com.icss.heartbeat;

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.handler.timeout.IdleState;
import io.netty.handler.timeout.IdleStateEvent;

public class MyServerHandler extends ChannelInboundHandlerAdapter {


    @Override
    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
        if (evt instanceof IdleStateEvent){
            IdleStateEvent  event = (IdleStateEvent)evt;
            String eventType =  null;
            switch (event.state()){
                case READER_IDLE:
                    eventType = "读空闲";
                    break;
                case  WRITER_IDLE:
                    eventType="写空闲";
                    break;
                case ALL_IDLE:
                    eventType="读写空闲";
                    break;

            }
            System.out.println(ctx.channel().remoteAddress()  + "超时事件" + eventType);

            ctx.channel().close();
        }
    }
}