package org.springblade.modules.netty.server;
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import io.netty.bootstrap.Bootstrap;
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import io.netty.channel.*;
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import io.netty.channel.nio.NioEventLoopGroup;
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import io.netty.channel.socket.nio.NioDatagramChannel;
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import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
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import io.netty.util.concurrent.DefaultEventExecutorGroup;
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import io.netty.util.concurrent.EventExecutorGroup;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springblade.modules.netty.config.MyDecoder;
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import org.springblade.modules.netty.handle.UdpServerHandler;
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import org.springframework.scheduling.annotation.Async;
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import org.springframework.stereotype.Component;
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/**
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* updServer udp服务端
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*
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* @author zhongrj
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* @date 2023-02-21
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*/
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@Component
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public class UdpServer {
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private static Logger LOG = LoggerFactory.getLogger(UdpServer.class);
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//给管道抽象出接口，给Channel更多的能力和配置，例如Channel的状态，参数，IO操作
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//使用ChannelPipeline实现自定义IO
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//Channel channel;
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@Async("taskExecutor")
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public void run(int port) {
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//启动服务
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EventLoopGroup workerGroup = new NioEventLoopGroup();
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//优化使用的线程
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final EventExecutorGroup group = new DefaultEventExecutorGroup(16);
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try {
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//udp不能使用ServerBootstrap
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Bootstrap b = new Bootstrap();
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//设置UDP通道
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b.group(workerGroup).channel(NioDatagramChannel.class)
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//设置udp的管道工厂
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.handler(new ChannelInitializer<NioDatagramChannel>() {
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//NioDatagramChannel标志着是UDP格式的
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@Override
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protected void initChannel(NioDatagramChannel ch)
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throws Exception {
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// TODO Auto-generated method stub
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//创建一个执行Handler的容器
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ChannelPipeline pipeline = ch.pipeline();
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// pipeline.addLast(new StringDecoder());
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pipeline.addLast("decoder",new MyDecoder());
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// pipeline.addLast(new StringEncoder());
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pipeline.addLast(new LengthFieldBasedFrameDecoder(Integer.MAX_VALUE, 4, 4, -8, 0));
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//执行具体的自定义处理器
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pipeline.addLast(group, "handler", new UdpServerHandler());
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}
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})//初始化处理器
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//true / false 多播模式(UDP适用),可以向多个主机发送消息
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.option(ChannelOption.SO_BROADCAST, true)
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// 设置UDP读缓冲区为2M
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.option(ChannelOption.SO_RCVBUF, 2048 * 1024)
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// 设置UDP写缓冲区为1M
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.option(ChannelOption.SO_SNDBUF, 1024 * 1024);
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// 绑定端口，开始接收进来的连接
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ChannelFuture f = b.bind(port).sync();
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//获取channel通道
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System.out.println("UDP Server 启动,端口:" + port);
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// 等待服务器 socket 关闭 。
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// 这不会发生，可以优雅地关闭服务器。
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f.channel().closeFuture().sync();
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} catch (InterruptedException e) {
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e.printStackTrace();
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} finally {
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//优雅退出 释放线程池资源
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group.shutdownGracefully();
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workerGroup.shutdownGracefully();
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}
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}
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}
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