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 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);
}