Beispiel #1
1
 public int newCustomer(int id) throws RemoteException {
   Trace.info("INFO: RM::newCustomer(" + id + ") called");
   // Generate a globally unique ID for the new customer
   int cid =
       Integer.parseInt(
           String.valueOf(id)
               + String.valueOf(Calendar.getInstance().get(Calendar.MILLISECOND))
               + String.valueOf(Math.round(Math.random() * 100 + 1)));
   Customer cust = new Customer(cid);
   writeData(id, cust.getKey(), cust);
   Customer temp = cust.clone();
   temp.setID(-1);
   temp.setType(1);
   writeDataToLog(id, cust.getKey(), temp);
   Trace.info("RM::newCustomer(" + cid + ") returns ID=" + cid);
   return cid;
 }
Beispiel #2
1
 public ReturnTuple<Integer> newCustomer(int id, Timestamp timestamp)
     throws RemoteException, TransactionAbortedException, InvalidTransactionException {
   if (!isMaster) {
     System.out.println("Slave retransmitting newCustomer to master");
     return this.getMaster().newCustomer(id, timestamp);
   } else {
     timestamp.stamp();
     int rid =
         Integer.parseInt(
             String.valueOf(id)
                 + String.valueOf(Calendar.getInstance().get(Calendar.MILLISECOND))
                 + String.valueOf(Math.round(Math.random() * 100 + 1)));
     NewCustomerWithIdRMICommand nc =
         new NewCustomerWithIdRMICommand(carGroup, flightGroup, roomGroup, id, rid);
     nc.setTimestampObject(timestamp);
     ReturnTuple<Integer> result = null;
     try {
       overseer.validTransaction(id);
       lm.Lock(id, Customer.getKey(rid), nc.getRequiredLock());
       nc.execute();
       result = new ReturnTuple<Integer>(rid, nc.success.timestamp);
       overseer.addCommandToTransaction(id, nc);
     } 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
  // Deletes customer from the database.
  public boolean deleteCustomer(int id, int customerID) throws RemoteException {
    Trace.info("RM::deleteCustomer(" + id + ", " + customerID + ") called");
    Customer cust = (Customer) readData(id, Customer.getKey(customerID));

    if (cust == null) {
      Trace.warn(
          "RM::deleteCustomer(" + id + ", " + customerID + ") failed--customer doesn't exist");
      return false;
    } else {
      Customer temp = cust.clone();
      // Increase the reserved numbers of all reservable items which the customer reserved.
      RMHashtable reservationHT = cust.getReservations();
      for (Enumeration e = reservationHT.keys(); e.hasMoreElements(); ) {
        String reservedkey = (String) (e.nextElement());
        ReservedItem reserveditem = cust.getReservedItem(reservedkey);
        Trace.info(
            "RM::deleteCustomer("
                + id
                + ", "
                + customerID
                + ") has reserved "
                + reserveditem.getKey()
                + " "
                + reserveditem.getCount()
                + " times");
        ReservableItem item = (ReservableItem) readData(id, reserveditem.getKey());
        Trace.info(
            "RM::deleteCustomer("
                + id
                + ", "
                + customerID
                + ") has reserved "
                + reserveditem.getKey()
                + "which is reserved"
                + item.getReserved()
                + " times and is still available "
                + item.getCount()
                + " times");
        Flight tempItem =
            new Flight(Integer.parseInt(item.getLocation()), item.getCount(), item.getPrice());
        tempItem.setReserved(item.getReserved());
        tempItem.setType(0);
        item.setReserved(item.getReserved() - reserveditem.getCount());
        item.setCount(item.getCount() + reserveditem.getCount());
        if (readDataFromLog(id, item.getKey(), id) == null)
          writeDataToLog(id, item.getKey(), tempItem);
      }

      // remove the customer from the storage
      temp.setType(1);
      if (readDataFromLog(id, cust.getKey(), id) == null) writeDataToLog(id, cust.getKey(), temp);
      removeData(id, cust.getKey());

      Trace.info("RM::deleteCustomer(" + id + ", " + customerID + ") succeeded");
      return true;
    } // if
  }
Beispiel #4
0
 // Deletes customer from the database.
 public ReturnTuple<Boolean> deleteCustomer(int id, int customerID, Timestamp timestamp)
     throws RemoteException, TransactionAbortedException, InvalidTransactionException {
   if (!isMaster) {
     System.out.println("Slave retransmitting deleteCustomer to master");
     return this.getMaster().deleteCustomer(id, customerID, timestamp);
   } else {
     timestamp.stamp();
     DeleteCustomerRMICommand dc =
         new DeleteCustomerRMICommand(carGroup, flightGroup, roomGroup, id, customerID);
     dc.setTimestampObject(timestamp);
     ReturnTuple<Boolean> result = null;
     try {
       overseer.validTransaction(id);
       lm.Lock(id, Customer.getKey(customerID), 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 #5
0
 // Adds flight reservation to this customer.
 public ReturnTuple<Boolean> reserveFlight(
     int id, int customerID, int flightNum, Timestamp timestamp)
     throws RemoteException, TransactionAbortedException, InvalidTransactionException {
   if (!isMaster) {
     System.out.println("Slave retransmitting reserveFlight to master");
     return this.getMaster().reserveFlight(id, customerID, flightNum, timestamp);
   } else {
     timestamp.stamp();
     ReserveFlightRMICommand rf =
         new ReserveFlightRMICommand(flightGroup, id, customerID, flightNum);
     rf.setTimestampObject(timestamp);
     ReturnTuple<Boolean> result = null;
     try {
       overseer.validTransaction(id);
       lm.Lock(id, Customer.getKey(customerID), rf.getRequiredLock());
       lm.Lock(id, Flight.getKey(flightNum), rf.getRequiredLock());
       rf.execute();
       result = rf.success;
       if (result.result) overseer.addCommandToTransaction(id, rf);
     } 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 #6
0
 // I opted to pass in customerID instead. This makes testing easier
 public boolean newCustomer(int id, int customerID) throws RemoteException {
   Trace.info("INFO: RM::newCustomer(" + id + ", " + customerID + ") called");
   Customer cust = (Customer) readData(id, Customer.getKey(customerID));
   if (cust == null) {
     cust = new Customer(customerID);
     writeData(id, cust.getKey(), cust);
     Customer temp = cust.clone();
     temp.setType(1);
     temp.setID(-1);
     writeDataToLog(id, cust.getKey(), temp);
     Trace.info("INFO: RM::newCustomer(" + id + ", " + customerID + ") created a new customer");
     return true;
   } else {
     Trace.info(
         "INFO: RM::newCustomer(" + id + ", " + customerID + ") failed--customer already exists");
     return false;
   } // else
 }
Beispiel #7
0
 // return a bill
 public String queryCustomerInfo(int id, int customerID) throws RemoteException {
   Trace.info("RM::queryCustomerInfo(" + id + ", " + customerID + ") called");
   Customer cust = (Customer) readData(id, Customer.getKey(customerID));
   if (cust == null) {
     Trace.warn(
         "RM::queryCustomerInfo(" + id + ", " + customerID + ") failed--customer doesn't exist");
     return ""; // NOTE: don't change this--WC counts on this value indicating a customer does not
                // exist...
   } else {
     String s = cust.printBill();
     Trace.info("RM::queryCustomerInfo(" + id + ", " + customerID + "), bill follows...");
     System.out.println(s);
     return s;
   } // if
 }
Beispiel #8
0
 // Returns data structure containing customer reservation info. Returns null if the
 //  customer doesn't exist. Returns empty RMHashtable if customer exists but has no
 //  reservations.
 public RMHashtable getCustomerReservations(int id, int customerID) throws RemoteException {
   Trace.info("RM::getCustomerReservations(" + id + ", " + customerID + ") called");
   Customer cust = (Customer) readData(id, Customer.getKey(customerID));
   if (cust == null) {
     Trace.warn(
         "RM::getCustomerReservations failed("
             + id
             + ", "
             + customerID
             + ") failed--customer doesn't exist");
     return null;
   } else {
     return cust.getReservations();
   } // if
 }
Beispiel #9
0
 /* reserve an itinerary */
 public ReturnTuple<Boolean> itinerary(
     int id,
     int customer,
     Vector flightNumbers,
     String location,
     boolean Car,
     boolean Room,
     Timestamp timestamp)
     throws RemoteException, TransactionAbortedException, InvalidTransactionException {
   if (!isMaster) {
     System.out.println("Slave retransmitting itinerary to master");
     return this.getMaster()
         .itinerary(id, customer, flightNumbers, location, Car, Room, timestamp);
   } else {
     timestamp.stamp();
     ItineraryRMICommand i =
         new ItineraryRMICommand(
             carGroup, flightGroup, roomGroup, id, customer, flightNumbers, location, Car, Room);
     i.setTimestampObject(timestamp);
     ReturnTuple<Boolean> result = null;
     try {
       overseer.validTransaction(id);
       lm.Lock(id, Customer.getKey(customer), i.getRequiredLock());
       lm.Lock(id, ResImpl.Car.getKey(location), i.getRequiredLock());
       lm.Lock(id, Hotel.getKey(location), i.getRequiredLock());
       for (Object flightNo : flightNumbers) {
         int flightNum = Integer.parseInt((String) flightNo);
         lm.Lock(id, Flight.getKey(flightNum), i.getRequiredLock());
       }
       i.execute();
       result = i.success;
       if (result.result && !i.error()) overseer.addCommandToTransaction(id, i);
     } 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 #10
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;
   }
 }
Beispiel #11
0
  // reserve an item
  protected boolean reserveItem(int id, int customerID, String key, String location) {
    Trace.info(
        "RM::reserveItem( "
            + id
            + ", customer="
            + customerID
            + ", "
            + key
            + ", "
            + location
            + " ) called");
    // Read customer object if it exists (and read lock it)
    Customer cust = (Customer) readData(id, Customer.getKey(customerID));
    if (cust == null) {
      Trace.warn(
          "RM::reserveCar( "
              + id
              + ", "
              + customerID
              + ", "
              + key
              + ", "
              + location
              + ")  failed--customer doesn't exist");
      return false;
    }

    // check if the item is available
    ReservableItem item = (ReservableItem) readData(id, key);

    if (item == null) {
      Trace.warn(
          "RM::reserveItem( "
              + id
              + ", "
              + customerID
              + ", "
              + key
              + ", "
              + location
              + ") failed--item doesn't exist");
      return false;
    } else if (item.getCount() == 0) {
      Trace.warn(
          "RM::reserveItem( "
              + id
              + ", "
              + customerID
              + ", "
              + key
              + ", "
              + location
              + ") failed--No more items");
      return false;
    } else {
      Flight tempItem =
          new Flight(Integer.parseInt(item.getLocation()), item.getCount(), item.getPrice());
      tempItem.setReserved(item.getReserved());
      Customer temp = cust.clone();
      temp.setType(1);
      if (readDataFromLog(id, cust.getKey(), id) == null) {
        writeDataToLog(id, cust.getKey(), temp);
      }
      cust.reserve(key, location, item.getPrice());

      writeData(id, cust.getKey(), cust);

      // decrease the number of available items in the storage
      item.setCount(item.getCount() - 1);
      item.setReserved(item.getReserved() + 1);

      if (readDataFromLog(id, item.getKey(), id) == null) {
        tempItem.setType(0);
        writeDataToLog(id, item.getKey(), tempItem);
      }
      Trace.info(
          "RM::reserveItem( "
              + id
              + ", "
              + customerID
              + ", "
              + key
              + ", "
              + location
              + ") succeeded");
      return true;
    }
  }