php netty如何處理心跳機(jī)制

PHP
小樊
81
2024-10-17 08:04:46

在PHP中，使用Netty實(shí)現(xiàn)心跳機(jī)制需要以下幾個(gè)步驟：

  1. 創(chuàng)建一個(gè)ChannelInitializer，用于初始化ChannelHandler。在這個(gè)類中，我們將添加心跳處理器（HeartbeatHandler）到ChannelPipeline中。
use io.netty.channel.ChannelInitializer;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.timeout.IdleStateHandler;

class MyChannelInitializer extends ChannelInitializer<SocketChannel> {
    @Override
    protected void initChannel(SocketChannel ch) {
        // 添加心跳處理器
        ch.pipeline().addLast(new IdleStateHandler(0, 0, 30)); // 30秒發(fā)送一次心跳包
        ch.pipeline().addLast(new HeartbeatHandler());
    }
}
  1. 創(chuàng)建一個(gè)心跳處理器（HeartbeatHandler），繼承ChannelInboundHandlerAdapter。在這個(gè)類中，我們將處理心跳事件。
use io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.handler.timeout.IdleStateEvent;

class HeartbeatHandler extends ChannelInboundHandlerAdapter {
    @Override
    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) {
        if (evt instanceof IdleStateEvent) {
            IdleStateEvent event = (IdleStateEvent) evt;
            switch (event.state()) {
                case WRITER_IDLE:
                    // 寫空閑，客戶端可能已經(jīng)斷開(kāi)連接
                    System.out.println("Writer idle, possible disconnection");
                    break;
                case READER_IDLE:
                    // 讀空閑，客戶端可能已經(jīng)斷開(kāi)連接
                    System.out.println("Reader idle, possible disconnection");
                    break;
                case ALL_IDLE:
                    // 讀寫空閑，觸發(fā)心跳超時(shí)事件
                    System.out.println("All idle, trigger heartbeat timeout");
                    break;
            }
        } else {
            super.userEventTriggered(ctx, evt);
        }
    }
}
  1. 在客戶端和服務(wù)器端創(chuàng)建ServerBootstrap和ClientBootstrap實(shí)例，并將MyChannelInitializer添加到它們的pipeline中。

服務(wù)器端：

use io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;

public class Server {
    public static void main(String[] args) throws InterruptedException {
        EventLoopGroup bossGroup = new NioEventLoopGroup();
        EventLoopGroup workerGroup = new NioEventLoopGroup();

        try {
            ServerBootstrap serverBootstrap = new ServerBootstrap();
            serverBootstrap.group(bossGroup, workerGroup)
                    .channel(NioServerSocketChannel.class)
                    .childHandler(new MyChannelInitializer())
                    .option(ChannelOption.SO_BACKLOG, 128)
                    .childOption(ChannelOption.SO_KEEPALIVE, true);

            ChannelFuture channelFuture = serverBootstrap.bind(8080).sync();
            channelFuture.channel().closeFuture().sync();
        } finally {
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }
    }
}

客戶端：

use io.netty.bootstrap.ClientBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;

public class Client {
    public static void main(String[] args) throws InterruptedException {
        EventLoopGroup group = new NioEventLoopGroup();

        try {
            ClientBootstrap clientBootstrap = new ClientBootstrap();
            clientBootstrap.group(group)
                    .channel(NioSocketChannel.class)
                    .handler(new MyChannelInitializer())
                    .option(ChannelOption.SO_KEEPALIVE, true);

            ChannelFuture channelFuture = clientBootstrap.connect("localhost", 8080).sync();
            channelFuture.channel().closeFuture().sync();
        } finally {
            group.shutdownGracefully();
        }
    }
}

現(xiàn)在，服務(wù)器和客戶端之間的連接將使用心跳機(jī)制來(lái)檢測(cè)空閑連接，并在連接空閑超過(guò)30秒時(shí)觸發(fā)心跳超時(shí)事件。你可以根據(jù)需要調(diào)整心跳間隔和超時(shí)時(shí)間。

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