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;
}
// deletes the entire item
protected boolean deleteItem(int id, String key) {
Trace.info("RM::deleteItem(" + id + ", " + key + ") called");
ReservableItem curObj = (ReservableItem) readData(id, key);
Flight tempItem =
new Flight(Integer.parseInt(curObj.getLocation()), curObj.getCount(), curObj.getPrice());
tempItem.setReserved(curObj.getReserved());
// Check if there is such an item in the storage
if (curObj == null) {
Trace.warn("RM::deleteItem(" + id + ", " + key + ") failed--item doesn't exist");
return false;
} else {
if (curObj.getReserved() == 0) {
tempItem.setType(0);
writeDataToLog(id, curObj.getKey(), tempItem);
removeData(id, curObj.getKey());
Trace.info("RM::deleteItem(" + id + ", " + key + ") item deleted");
return true;
} else {
Trace.info(
"RM::deleteItem("
+ id
+ ", "
+ key
+ ") item can't be deleted because some customers reserved it");
return false;
}
} // if
}
// 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
}
// Create a new flight, or add seats to existing flight
// NOTE: if flightPrice <= 0 and the flight already exists, it maintains its current price
public boolean addFlight(int id, int flightNum, int flightSeats, int flightPrice)
throws RemoteException, InvalidTransactionException, TransactionAbortedException {
Trace.info(
"RM::addFlight("
+ id
+ ", "
+ flightNum
+ ", $"
+ flightPrice
+ ", "
+ flightSeats
+ ") called");
Flight curObj = (Flight) readData(id, Flight.getKey(flightNum));
if (curObj == null) {
// doesn't exist...add it
Flight newObj = new Flight(flightNum, flightSeats, flightPrice);
writeData(id, newObj.getKey(), newObj);
String key = newObj.getKey();
if (readDataFromLog(id, key, id) == null) {
Flight logObj = (Flight) newObj.clone();
logObj.setCount(-1);
logObj.type = 0;
writeDataToLog(id, key, logObj);
}
Trace.info(
"RM::addFlight("
+ id
+ ") created new flight "
+ flightNum
+ ", seats="
+ flightSeats
+ ", price=$"
+ flightPrice);
} else {
// add seats to existing flight and update the price...
Flight logObj = (Flight) curObj.clone();
if (readDataFromLog(id, curObj.getKey(), id) == null)
writeDataToLog(id, curObj.getKey(), logObj);
curObj.setCount(curObj.getCount() + flightSeats);
if (flightPrice > 0) {
curObj.setPrice(flightPrice);
} // if
writeData(id, curObj.getKey(), curObj);
Trace.info(
"RM::addFlight("
+ id
+ ") modified existing flight "
+ flightNum
+ ", seats="
+ curObj.getCount()
+ ", price=$"
+ flightPrice);
} // else
return (true);
}
// query the price of an item
protected int queryPrice(int id, String key) {
Trace.info("RM::queryCarsPrice(" + id + ", " + key + ") called");
ReservableItem curObj = (ReservableItem) readData(id, key);
int value = 0;
if (curObj != null) {
value = curObj.getPrice();
} // else
Trace.info("RM::queryCarsPrice(" + id + ", " + key + ") returns cost=$" + value);
return value;
}
// 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
}
// 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
}
// 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
}
// 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;
}
}