// 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
}
// 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
}
// query the number of available seats/rooms/cars
protected int queryNum(int id, String key) {
Trace.info("RM::queryNum(" + id + ", " + key + ") called");
ReservableItem curObj = (ReservableItem) readData(id, key);
int value = 0;
if (curObj != null) {
value = curObj.getCount();
} // else
Trace.info("RM::queryNum(" + id + ", " + key + ") returns count=" + value);
return value;
}
// Query the number of available seats/rooms/cars.
protected int queryNum(int id, String key) {
Trace.info("RM::queryNum(" + id + ", " + key + ") called.");
synchronized (syncLock) {
ReservableItem curObj = (ReservableItem) readData(id, key);
int value = 0;
if (curObj != null) {
value = curObj.getCount();
}
Trace.info("RM::queryNum(" + id + ", " + key + ") OK: " + value);
return value;
}
}
private boolean reserveItem(int id, int customerId, String key, String location) {
// Check if the item is available.
synchronized (syncLock) {
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 {
// Decrease the number of available items in the storage.
item.setCount(item.getCount() - 1);
item.setReserved(item.getReserved() + 1);
Trace.warn(
"RM::reserveItem(" + id + ", " + customerId + ", " + key + ", " + location + ") OK.");
return true;
}
}
}
// 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;
}
}