package com.hoten.tail;
import java.io.*;
import java.util.*;
import java.net.*;
import com.hoten.util.*;
/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2002</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */

public class Tail implements Runnable {
  private TailList list = TailList.getInstance();
  private TailInfo info  = null;
  private String _logFile = MOParam.getInstance().logFile;
  private DBAccess dbAccess = new DBAccess();
  private static boolean flag=true;
  private DatagramSocket socket;

  public Tail() {
    try {
      creatSocket();
    }
    catch (Exception ex) {
    }
  }
  public static void stopThread(){
        flag=false;
  }

  private void creatSocket()throws Exception{
    socket = new DatagramSocket();
  }
  public void run(){
   Log.printEvent("監控系統啟動",_logFile);
   int i = 0;
        try {
            /** 未被中斷情況下正常運行 */
            while(flag){
                /** 取到并刪處MO消息隊列中的一條消息 */
                info = (TailInfo)list.remove();
                /** 若消息隊列為空，暫停一段時間再繼續循環獲取消息 */
                if(info==null){
                    if(i==0){
                      TailTools.setTailFlag(dbAccess);
                    }
                    i++;
                    if(i==60*3) i=0;
                    Thread.currentThread().sleep(1000);
                    continue;
                }
                /** 若消息體為空，則將相應消息特殊標記，存入公共出錯模塊，否則正常處理 */
                try {
                  doTail(info);
                }
                catch (Exception ex) {
                  try {
                    socket.close();
                    creatSocket();
                  }
                  catch (Exception x) {
                  }
                  Log.printError(ex,"","",_logFile);
                }
                info=null;
                Thread.currentThread().sleep(10);
            }
        }
        /** InterruptedException異常 */
        catch (InterruptedException ex) {
        }
        dbAccess.release();
        Log.printEvent("監控系統退出",_logFile);
  }
  private void doTail(TailInfo info)throws Exception{
    if(socket.isClosed()){
      creatSocket();
    }
    DatagramPacket dp = getPacket(info);
    sendPacket(dp);
  }

  private DatagramPacket getPacket(TailInfo info)throws Exception{
    DatagramPacket dp= new DatagramPacket(info.getData(),info.getData().length,InetAddress.getByName(info.getHost()),info.getPort());
    return dp;
  }

  private void sendPacket(DatagramPacket packet)throws Exception{
    socket.send(packet);
  }
}