public static bool TransferMoney(Account starting, Account destination, float amount)
{
if (amount > max_transfer)
{
MessageBox.Show("Amount exceeds maximum single transaction limit.");
return(false);
}
//Attempt to make changes to the account balance itself thread safe.
Mutex mutex = new Mutex();
mutex.WaitOne();
//Critical Section - Begin
bool transferComplete = false;
using (var context = new AccountManagerContext()) {
destination.Balance += amount;
starting.Balance -= amount;
if (starting.GetType() == typeof(SavingsAccount))
{
SavingsAccount s = (SavingsAccount)starting;
s.WithdrawalsThisMonth++;
}
context.Entry(starting).State = System.Data.Entity.EntityState.Modified;
context.Entry(destination).State = System.Data.Entity.EntityState.Modified;
context.SaveChanges();
transferComplete = true;
}
//Critical Section - End
mutex.ReleaseMutex();
return(transferComplete);
}
public static bool CreateAccount(int pin, String name, String businessName, Bank_Name bank)
{
Mutex mutex = new Mutex();
mutex.WaitOne();
using (var context = new AccountManagerContext())
{
if (!VerifyPin(pin))
{
return(false);
}
if (FindAccount(pin, name, bank, AccountType.Business) != null)
{
return(false);
}
BusinessAccount account = new BusinessAccount
{
PinNumber = pin,
AccountHolder = name,
BankName = bank,
BusinessName = businessName,
Balance = 0,
AccountOpenDate = DateTime.Parse(DateTime.Today.ToString())
};
context.BusinessAccounts.Add(account);
context.SaveChanges();
}
mutex.ReleaseMutex();
return(true);
}
public static bool CreditAccount(Account account, float creditAmount)
{
if (creditAmount > max_transfer)
{
MessageBox.Show("Amount exceeds maximum single transaction limit.");
return(false);
}
//Attempt to make changes to the account balance itself thread safe.
Mutex mutex = new Mutex();
mutex.WaitOne();
//Critical Section - Begin
bool balanceChanged = false;
using (var context = new AccountManagerContext())
{
account.Balance += creditAmount;
context.Entry(account).State = System.Data.Entity.EntityState.Modified;
context.SaveChanges();
}
balanceChanged = true;
//Critical Section - End
mutex.ReleaseMutex();
return(balanceChanged);
}
/*
*
* Overloaded functions for creating accounts
* These methods were just for quick testing, a user creating a bank account from an application would be strange from a real world perspective
*
*/
public static bool CreateAccount(int pin, float monthlyTransfer, String name, Bank_Name bank)
{
Mutex mutex = new Mutex();
mutex.WaitOne();
using (var context = new AccountManagerContext())
{
if (!VerifyPin(pin))
{
return(false);
}
if (FindAccount(pin, name, bank, AccountType.Checking) != null)
{
return(false);
}
CheckingAccount account = new CheckingAccount
{
PinNumber = pin,
AccountHolder = name,
BankName = bank,
Balance = 0,
AccountOpenDate = DateTime.Parse(DateTime.Today.ToString()),
MonthlyTransferAmount = monthlyTransfer,
};
context.CheckingAccounts.Add(account);
context.SaveChanges();
}
mutex.ReleaseMutex();
return(true);
}