/**
* Starts the progress poll. This should be called after you have set the bus with {@link
* #setBus(EMEventBus)} or previously called {@link #startProgressPoll(EMEventBus)}, otherwise you
* won't get notified of progress changes
*/
public void startProgressPoll() {
if (bus != null || defaultControls != null || progressCallback != null) {
pollRepeater.start();
}
}
