/**
* The given object wants to be notified of this event
*
* @param observer
*/
public static synchronized void subscribe(Observer observer) {
if (houseKeeper == null) {
houseKeeper = new CacheHouseKeeper();
}
houseKeeper.addObserver(observer);
houseKeeper.checkTimerThread();
}
/**
* The given object no longer wants to be notified of this event
*
* <p>The timer will shutdown if it is no longer being observed
*
* @param observer
*/
public static synchronized void unSubscribe(Observer observer) {
if (houseKeeper != null) {
houseKeeper.deleteObserver(observer);
if (houseKeeper.countObservers() == 0) {
stop();
}
}
}
/** Stop timer thread */
public static synchronized void stop() {
if (houseKeeper != null && houseKeeper.houseKeeperThread.running) {
houseKeeper.houseKeeperThread.running = false;
houseKeeper.deleteObservers();
houseKeeper.houseKeeperThread.interrupt();
try {
houseKeeper.houseKeeperThread.join();
} catch (InterruptedException e) {
}
houseKeeper.houseKeeperThread = null;
houseKeeper = null;
}
}
/** Trigger for the housekeeping event (can be called directly as a manual trigger) */
public static synchronized void triggerEvent() {
if (houseKeeper != null) {
houseKeeper.setChanged();
houseKeeper.notifyObservers(TICK);
}
}