String time = configs.get("expunge.interval");
_expungeInterval = NumbersUtil.parseInt(time, 86400);
time = configs.get("expunge.delay");
_expungeDelay = NumbersUtil.parseInt(time, _expungeInterval);
_executor = Executors.newScheduledThreadPool(wrks, new NamedThreadFactory("UserVm-Scavenger"));
String aggregationRange = configs.get("usage.stats.job.aggregation.range");
int _usageAggregationRange = NumbersUtil.parseInt(aggregationRange, 1440);
int HOURLY_TIME = 60;
final int DAILY_TIME = 60 * 24;