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package com.loocme.sys.udp;

import com.loocme.sys.util.ThreadUtil;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;

@Slf4j
public class SocketServer implements Runnable
{

    private int port;
    private DatagramSocket server;
    private ThreadUtil.ExecutorService workers = null;
    private IPackageDeal packageDeal;
    private int packageLength;

    public SocketServer(int port, int workerNum, int packageLength, IPackageDeal packageDeal)
    {
        this.port = port;
        this.packageDeal = packageDeal;
        this.packageLength = packageLength;

        if (1024 >= port || 65535 <= port)
        {
            log.error("the udp server port [" + port + "] outer of range between 1025 and 65524 .");
            return;
        }
        if (null == packageDeal)
        {
            log.error("the udp server package deal class must not empty .");
            return;
        }

        try
        {
            server = new DatagramSocket(port);
            log.info("start upd server with port [" + port + "] .");
        }
        catch (SocketException e)
        {
            log.error("create upd server with port [" + port + "] failed. the reason is : ", e);
            server = null;
            return;
        }

        if (0 >= workerNum || 200 < workerNum)
        {
            log.warn("the udp worker number [" + workerNum + "] outer of range between 1 and 200, reset to 100 .");
            workerNum = 100;
        }
        workers = ThreadUtil.newFixedThreadPool(workerNum);
    }

    public boolean isInitialSuccess()
    {
        return null != server;
    }

    @Override
    public void run()
    {
        while (true)
        {
            try
            {
                byte[] b = new byte[packageLength];
                DatagramPacket packet = new DatagramPacket(b, packageLength);
                this.server.receive(packet);
                ServerWorker worker = new ServerWorker(packet, packageDeal);
                workers.execute(worker);
            }
            catch (IOException e)
            {
                e.printStackTrace();
            }
        }
    }
}