GWT - Scheduling a timer within another timer

Question

I have 2 timers for my GWT application. Both are repeating timers. I start running Timer1 and after some point, I cancel the timer inside its run() method and do scheduleReapeating for Timer2. Timer1's cancel occuts, but Timer2 doesn't not running. I tried running Timer2 directly and it did run. So there is nothing wrong with Timer2's code. Only that it is not running if I make it run from within Timer 1. Can't we not schedule timers whis way?

Timer timer1 = new Timer() {
@Override
public void run {
     //Some processing
     //...
     //..
     if(some_condition) {
         cancel();
         timer2.scheduleRepeating(100);
         }
     }
};
Timer2 timer 2 = new Timer() {
@Override
public void run() {
       //some processing
       //....
       //....
     }
};

}

How aboout starting timer2 before cancel() timer1? (ie. reverse the statements inside the if in timer1) — Ovi Faur
Timers definitely work this way, there may be some other code in your application that is preventing this from running correctly. — Colin Alworth
ya Colin you're correct. There was a logic that was preventing the the condition needed for timer2 to start. My bad. Thanks everybody. — somesh

Churro Churro · Accepted Answer · 2014-01-20T19:45:27

I just ran this test code, and it worked as expected. It switches which timer runs, based on what radio button you clicked:

public class TestProj implements EntryPoint {

    //some timers
    Timer timer2, timer1;

    //buttons to operate timers
    RadioButton b1 = new RadioButton("group", "Timer 1"), 
                b2 = new RadioButton("group", "Timer 2");

    //output panel
    VerticalPanel output = new VerticalPanel();

    public void onModuleLoad() {

        RootPanel.get().add(b1);
        RootPanel.get().add(b2);
        RootPanel.get().add(output);

        timer1 = new Timer() {
            @Override
            public void run() {
                output.add(new Label("Timer 1 ran"));

                if (b2.getValue()) {
                    cancel();
                    timer2.scheduleRepeating(1000);
                }
            }
        };

        timer2 = new Timer() {
            @Override
            public void run() {
                output.add(new Label("Timer 2 ran"));

                if (b1.getValue()) {
                    cancel();
                    timer1.scheduleRepeating(1000);
                }
            }
        };

        //initial start of timer1
        timer1.scheduleRepeating(1000);
    }
}

GWT - Scheduling a timer within another timer

2 Answers