question: private void cancelEventLeaseDo ( long eventID , Uuid leaseID ) throws UnknownLeaseException { long now = SystemTime . timeMillis ( ) ; EventReg reg = eventByID . get ( eventID ) ; if ( reg == null || reg . leaseExpiration <= now ) throw new UnknownLeaseException ( ) ; deleteEvent ( null , reg ) ; }
target:  The code that does the real work of cancelEventLease.