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;
}
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;
}
}
// 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
}
// 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
}
// 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;
}
}
// 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;
}
}
public void abort(int transactionId) throws RemoteException, InvalidTransactionException {
int indx = logContains(transactionId);
Log temp;
if (indx > -1) {
temp = (Log) logArray.elementAt(indx);
} else {
System.out.println("nothing in array");
return;
}
for (Enumeration e = temp.getKeys(); e.hasMoreElements(); ) {
System.out.println("For loop");
String key = (String) (e.nextElement());
RMItem obj = temp.get(key);
if (obj.getType() == 0) {
Flight flight = (Flight) obj;
if (flight.getCount() == -1) {
System.out.println("entering count=-1 block");
removeData(transactionId, key);
} else {
System.out.println("entering other block");
writeData(transactionId, key, flight);
}
} else if (obj.getType() == 1) {
Customer cust = (Customer) obj;
if (cust.getID() == -1) {
System.out.println("entering remove data for customer");
removeData(transactionId, key);
} else {
System.out.println("entering write data for customer");
writeData(transactionId, key, obj);
}
}
}
}
/* 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;
}
}
// 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
}
// 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;
}
}
public String createAccountId(Customer customer) throws RemoteException {
return getId() + "." + customer.getName() + "." + (nextAccountId++);
}
// 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;
}
}
