log.log(log.LOG_DEBUG, "DeviceManager queuing DeviceTracker");
log.log(LogService.LOG_DEBUG, "DeviceManager queuing DeviceTracker");
	public synchronized void enqueue(DeviceTracker device) {		if (device != null) {			if (Activator.DEBUG) {				log.log(log.LOG_DEBUG, "DeviceManager queuing DeviceTracker"); //$NON-NLS-1$			}			DeviceService item = new DeviceService(device);			if (head == null) /* if the queue was empty */			{				head = item;				tail = item;			} else /* else add to end of queue */			{				tail.next = item;				tail = item;			}		}		notify();	}