lastHour = startTime.getTime()/Data.MILLIS_PER_HOUR; lastDay = startTime.getTime()/Data.MILLIS_PER_DAY; lastWeek = startTime.getTime()/Data.MILLIS_PER_WEEK; stopTime = null;
    private Stats() {        clientVersionRequests =                        Collections.synchronizedMap( new HashMap());        clientRequests =                        Collections.synchronizedMap( new HashMap());        getRequests = new Counter();        hostRequests = new Counter();        urlRequests = new Counter();        numUpdates = new Counter();        numRequests = new Counter();        startTime = new Date();    }