package com.zy.acs.gateway;


import com.zy.acs.gateway.config.SystemProperties;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.buffer.PooledByteBufAllocator;
import io.netty.channel.Channel;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.util.ResourceLeakDetector;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;

/**
 * TCP/IP协议端口
 * Netty Server 引导类
 * @author Vincent
 */
@Component
public class OnlineServer {

    private static final Logger log = LoggerFactory.getLogger(OnlineServer.class);

    private final HandlerInitializer handlerInitializer;
    private final SystemProperties systemProperties;
    private Channel channel;
    private ServerBootstrap bootstrap;
    private EventLoopGroup bossGroup;
    private EventLoopGroup workerGroup;

    @Autowired
    public OnlineServer(SystemProperties systemProperties, HandlerInitializer handlerInitializer) { ;
        this.systemProperties = systemProperties;
        this.handlerInitializer = handlerInitializer;
    }

    {
        bootstrap = new ServerBootstrap();
        bossGroup = new NioEventLoopGroup(1);
        workerGroup = new NioEventLoopGroup();
    }


    /**
     *  tcp server init
     */
    @PostConstruct
    public void serverStart() throws Exception {

        bootstrap.group(bossGroup, workerGroup)
                .channel(NioServerSocketChannel.class)
                .childHandler(handlerInitializer)
                .option(ChannelOption.SO_BACKLOG, systemProperties.getBacklog())
                .option(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT)
                .childOption(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT)
                .childOption(ChannelOption.SO_KEEPALIVE, systemProperties.isKeepAlive())
                .childOption(ChannelOption.SO_SNDBUF, systemProperties.getSndbuf())
                .childOption(ChannelOption.SO_RCVBUF, systemProperties.getRcvbuf());

        ResourceLeakDetector.setLevel(ResourceLeakDetector.Level.ADVANCED);

        log.info("TCP server started successfully, port：{}", systemProperties.getPort());

        channel = bootstrap.bind(systemProperties.getPort()).sync().channel();
    }


    /**
     * tcp server stop
     */
    @PreDestroy
    public void destroy() {
        if (channel != null && channel.isActive()) {
            channel.close();
        }
        if (bossGroup != null) {
            bossGroup.shutdownGracefully();
        }
        if (workerGroup != null) {
            workerGroup.shutdownGracefully();
        }
        log.info("TCP server stopped successfully, port: {}", systemProperties.getPort());
    }

}