Scheduling multiple tasks dynamically

Question

Hi !
I'm working on schedulers.
My problem is I have a list of dynamically generated reports.For every report that is generated , a corresponding scheduler must run periodically say , every day at certain time. The time at which the scheduler must run will be inputted by the user for each report.
I was able to run the scheduler perfectly if there was just one report. But whenever I have more than 1 report , I'm unable to handle.
Please suggest any idea or solution for this.
My scheduler will start when my application server is started.
I'm using a class that extends TimerTask class.
Thanks in advance,
Chandrika

Answer 1

Hi !
A'rite here is the code ....
I'm using a struts frame work , where in I'm using a plugin. From the plugin i'm calling the scheduler.
The PLUGIN class is as below:
public class CJobPlugIn implements PlugIn
     private static String CLASS_NAME = "CJobPlugIn";
     public CJobPlugIn()
          System.out.println("IN CJOb plugin Construtor");
     }//constructor
     * this method will be call at the end of an application
     * @return     void value
     public void destroy()
          String strMethodName = "destroy()";
          try
          CJobNightly.stop();          
          catch (Exception e)
               e.printStackTrace(System.out);
     }// destroy()
public void init(ActionServlet servlet,ModuleConfig moduleConfig) throws ServletException
          System.out.println("In Init() of Plug IN");
          String strMethodName = "init()";
          try
          CJobNightly.start();                    
          catch (Exception e)
               e.printStackTrace(System.out);
     }// init()
}// CJobPlugIn
Here ends the plugin.
Now the Scheduler Class:
public class CJobNightly extends TimerTask
     private static Timer cron;                    private static int run_hour;                    private static int runmins;               
     private static int dayin_mills;               
     private static boolean doRun;                    private static boolean inProcess;                    private static String trueStartTime;                    //to hold date in string value
     private static Date runDate;                    //Date objet , to hold start date
     private static String CLASS_NAME = "CJobNightly";     //class name
//     private Logger logger =null;
     public CJobNightly()
          //logger variable initialization
     //static block which sets the data porting time
     static
          runhour = 16;
          runmins = 35;
          dayin_mills = 24 * 60 * 60 * 1000;
          _cron = new Timer();
          trueStartTime = new Date().toString();
          // runDate = getStartDate();
          runDate = new Date();
          inProcess = false;
public static synchronized void start()
          //scheduling jobremainder to specifed date      
     _cron.schedule(new CJobNightly(), runDate);
     doRun = true; //setting doRun=true
public static synchronized void stop()
     doRun = false;
     //stoping the job porting
     _cron.cancel();
     public void run()
     String strMethod = "run()";
     // logger.info(strMethod+"constructor - Run :" + doRun);
     if (doRun)
               startJob();
     _cron.schedule(new CJobNightly(), 1 * 60 * 1000);
     //logger.info(strMethod+" Run - _cron:" + _cron);
public static synchronized boolean isRunning(){
     return(doRun);
public static synchronized void remoteStart()
     doRun = true;
public static synchronized void remoteStop()
     doRun = false;
public static synchronized void switchRunMode()
          if (doRun)
          doRun = false;
          else
          doRun = true;
public void startJob()
          ExcelProcessing ep = new ExcelProcessing();
          String strFileName = "D:/Book1.xls";
          String strSheet1 = "Sheet1";
          try{
               HSSFWorkbook wb1 = new HSSFWorkbook();
                              wb1 = ep.readExcel(strFileName);
               if(ep.worksheetExists(strSheet1,wb1)){
                    wb1 = ep.processSheet(wb1,strSheet1);
                    boolean flag = false;
                    flag = ep.writeExcel(strFileName,wb1);
               else{
                    System.out.println("work sheet do not exist");
          catch(Exception e){
               System.out.println("Catch");
               e.printStackTrace();
               System.out.println(e.toString());
}// startJob()
I'm writing into an excel whenever the scheduler gets fired.So i used the
HSSF , POI.jar.
Please suggest a solution or idea tht will enable me to move further.
Thanks ,
chandrika.