Timers and Singletons

A little history about what I want my app to do first.  I am writing a program to turn on my wifi on and off at a scheduled time.  For example, to turn on the wifi at 19:30, turn it off at 08:00 the next day.  Here's how the program works.  There are 2 entry points for statup auto code and one for the GUI.  The autostartup reads dates (if any) of the persistent store and planning timers accordingly.  Then if the user opens the graphical user interface, they are presented with 2 selectors field dates to set the on and off time again.  When recording these data, it should write back to the store, cancel the current timmer and plan new timers.  Here's the code.  For brevity, I have excluded which, in my view, are not relevant.

//imports
public class WifiScheduler extends UiApplication
{
    public static void main(String[] args)
    {
        if (args.length > 0 && args[0].equals("autostartup"))
        {
        //read data from store             //do some parsing to get date values for dateOn and dateOff

            GlobalTimer myTimer = GlobalTimer.getInstance();
            myTimer.setTimer(dateOn,dateOff);
        }
        else
        {
            WifiScheduler app = new WifiScheduler();
            app.enterEventDispatcher();
        }
    }
    public WifiScheduler()
    {
        pushScreen( new SchedulerScreen() );
    }
}

//imports
public class SchedulerScreen extends MainScreen
{
    public SchedulerScreen()
    {
      // setup date fields and add to vertical field manager
    }
    public static long stringToDate(String temp)
    {
      //convert a string to date format
    }
    protected boolean onSave()
    {
        //add new values to persistent store
        //get values for dateOn and dateOff

        GlobalTimer myTimer =GlobalTimer.getInstance();
        myTimer.setTimer(dateOn, dateOff);
        return true;
    }
}

//imports
class GlobalTimer
{
    private static GlobalTimer _instance = null;
    private static final long GUID = 0xab4dd61c5d114c18L;
    private Timer _timer = null;

    GlobalTimer()
    {
    }

    public static GlobalTimer getInstance()
    {
        if (_instance == null)
        {
            _instance = (GlobalTimer) RuntimeStore.getRuntimeStore().get(GUID);
            if (_instance == null)
            { // If it is still null, i.e. null in the RuntimeStore
                GlobalTimer singleton = new GlobalTimer();
                RuntimeStore.getRuntimeStore().put(GUID, singleton);
                _instance = singleton;
            } // inner if
        } // outer if
        return _instance;
    } // getInst

    public void killTimer()
    {
           //currently not using this because _timer is always null
        _timer.cancel();
    }
    public void setTimer(Date dateOn, Date dateOff)
    {
        if (_timer != null)
        {
            try
            {
                _timer.cancel();
            }
            catch (Exception e)
            {
                System.out.println("Could not cancel _timer");
            }
            _timer = null;
        }
                //create new instance of timer
        //WRONG Timer _timer = new Timer();                  _timer = new Timer(); //CORRECTED                //Yes, I am aware that a delay of 5000 is not daily, it just makes debugging easier
        _timer.scheduleAtFixedRate(new TurnWifiOn(), dateOn, 5000);
        _timer.scheduleAtFixedRate(new TurnWifiOn(), dateOff, 5000);
    }
}

The problem is when I call setTimer line GUI code

if (_timer != null)

is always false, even though I know that I have and you will see a timer running from my statup code.  My singleton or my body doesn't seem to work properly.  My understanding of how this code should work that is to use the singleton I can obtain and modify a specific instance of my timer.  For any help or suggestion would be greatly appreciated.

So it is. Now that I re-read your original post, I think that there is a totally different problem. You declare in your SetTimer()) method, a local variable _timer that hides the member variable. That's why the next time, _timer is always set to null. Try changing:

//create new instance of timer
Timer _timer = new Timer();

TO:

//create new instance of timer
_timer = new Timer();

Tags: BlackBerry Developers

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    https://support.Microsoft.com/en-us/KB/913405?WA=wsignin1.0

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