JavaFX periodic background task

Question

I try to run in JavaFX application background thread periodically, which modifies some GUI property.

I think I know how to use Task and Service

Answer 1

You can use ScheduledService too. I am using this alternative after noticing that during the use of Timeline and PauseTransition occurred some UI freezes in my application, especially when the user interacts with the elements of a MenuBar (on JavaFX 12). Using the ScheduledService these problems no longer occurred.

class UpdateLabel extends ScheduledService {

   private Label label;

   public UpdateLabel(Label label){
      this.label = label;
   }

   @Override
   protected Task createTask(){
      return new Task(){
         @Override
         protected Void call(){
           Platform.runLater(() -> {
              /* Modify you GUI properties... */
              label.setText(new Random().toString());
           });
           return null;
         }
      }
   }
}

And then, use it:

class WindowController implements Initializable {

   private @FXML Label randomNumber;

   @Override
   public void initialize(URL u, ResourceBundle res){
      var service = new UpdateLabel(randomNumber);
      service.setPeriod(Duration.seconds(2)); // The interval between executions.
      service.play()
   }
}