@Override
 public void releaseHoldOrders() {
   for (SeatHold seatHold : MockData.holdsMap.values()) {
     if (ReservationStatusType.HOLD.equals(seatHold.getStatus())) {
       synchronized (seatHold) {
         if (Calendar.getInstance().getTimeInMillis() - seatHold.getHoldTimestamp()
             > holdTimeInSeconds * 1000) {
           for (Seat seat : seatHold.getSeats()) {
             seat.setStatus(SeatStatusType.AVAILABLE);
             MockData.seatsMap.get(seat.getVenueLevel()).add(seat);
           }
           seatHold.setStatus(ReservationStatusType.RELEASED);
         }
       }
     }
   }
 }