Beispiel #1
0
 // Returns price of cars at this location
 public ReturnTuple<Integer> queryCarsPrice(int id, String location, Timestamp timestamp)
     throws RemoteException, TransactionAbortedException, InvalidTransactionException {
   if (!isMaster) {
     System.out.println("Slave retransmitting queryCarsPrice to master");
     return this.getMaster().queryCarsPrice(id, location, timestamp);
   } else {
     QueryCarsPriceRMICommand qcp = new QueryCarsPriceRMICommand(roomGroup, id, location);
     qcp.setTimestampObject(timestamp);
     ReturnTuple<Integer> result = null;
     try {
       overseer.validTransaction(id);
       lm.Lock(id, Car.getKey(location), qcp.getRequiredLock());
       qcp.execute();
       result = qcp.price;
     } catch (DeadlockException d) {
       timestamp.stamp();
       overseer.abort(id);
       timestamp.stamp();
       throw new TransactionAbortedException(timestamp);
     } catch (TransactionAbortedException tae) {
       tae.t = timestamp;
       throw tae;
     } catch (InvalidTransactionException ite) {
       ite.t = timestamp;
       throw ite;
     }
     result.timestamp.stamp();
     return result;
   }
 }
Beispiel #2
0
 // Delete cars from a location
 public ReturnTuple<Boolean> deleteCars(int id, String location, Timestamp timestamp)
     throws RemoteException, TransactionAbortedException, InvalidTransactionException {
   if (!isMaster) {
     System.out.println("Slave retransmitting deleteCars to master");
     return this.getMaster().deleteCars(id, location, timestamp);
   } else {
     timestamp.stamp();
     DeleteCarsRMICommand dc = new DeleteCarsRMICommand(carGroup, id, location);
     dc.setTimestampObject(timestamp);
     ReturnTuple<Boolean> result = null;
     try {
       overseer.validTransaction(id);
       lm.Lock(id, Car.getKey(location), dc.getRequiredLock());
       dc.execute();
       result = dc.success;
       if (result.result) overseer.addCommandToTransaction(id, dc);
     } catch (DeadlockException d) {
       timestamp.stamp();
       overseer.abort(id);
       timestamp.stamp();
       throw new TransactionAbortedException(timestamp);
     } catch (TransactionAbortedException tae) {
       tae.t = timestamp;
       throw tae;
     } catch (InvalidTransactionException ite) {
       ite.t = timestamp;
       throw ite;
     }
     result.timestamp.stamp();
     return result;
   }
 }
Beispiel #3
0
 // return a bill
 public ReturnTuple<String> queryCustomerInfo(int id, int customerID, Timestamp timestamp)
     throws RemoteException, TransactionAbortedException, InvalidTransactionException {
   if (!isMaster) {
     System.out.println("Slave retransmitting queryCustomerInfo to master");
     return this.getMaster().queryCustomerInfo(id, customerID, timestamp);
   } else {
     timestamp.stamp();
     QueryCustomerInfoRMICommand qci =
         new QueryCustomerInfoRMICommand(carGroup, flightGroup, roomGroup, id, customerID);
     qci.setTimestampObject(timestamp);
     ReturnTuple<String> result = null;
     try {
       Vector<Integer> flightNos;
       Vector<String> locations;
       overseer.validTransaction(id);
       lm.Lock(id, Customer.getKey(customerID), qci.getRequiredLock());
       qci.execute();
       flightNos = qci.getCustomerFlightReservations();
       for (int flightNo : flightNos) {
         lm.Lock(id, Flight.getKey(flightNo), qci.getRequiredLock());
       }
       locations = qci.getCustomerRoomReservations();
       for (String location : locations) {
         lm.Lock(id, Hotel.getKey(location), qci.getRequiredLock());
       }
       locations = qci.getCustomerCarReservations();
       for (String location : locations) {
         lm.Lock(id, Car.getKey(location), qci.getRequiredLock());
       }
       qci.execute();
       result = qci.customerInfo;
     } catch (DeadlockException d) {
       timestamp.stamp();
       overseer.abort(id);
       timestamp.stamp();
       throw new TransactionAbortedException(timestamp);
     } catch (TransactionAbortedException tae) {
       tae.t = timestamp;
       throw tae;
     } catch (InvalidTransactionException ite) {
       ite.t = timestamp;
       throw ite;
     }
     result.timestamp.stamp();
     return result;
   }
 }