//allow user to take cash from the account with datarace. It receives as input amount of money to be taken
private void takeCashTrue(int cash)
{
if (cash == 0) //if amount of money is equal to zero, user is prompt to specify valid amount
{
screen7();
}
else
{
textBox1.Text = "";
if (activeAccount.getBalance() < cash) // checks if there is enought money to be taken
{
activeAccount.Unlock(); // unlock the access to the balance
setScreen4False();
}
else
{
activeAccount.Unlock(); // unlock the access to the balance
int oldBalance = activeAccount.getBalance();
activeAccount.Unlock(); // unlock access to the balance, that won't prevent datarace condition
Thread.Sleep(1000); // sleep to give to a user chance to perform simultaneous work for another ATM thread
setScreen4True();
Thread.Sleep(2000);
activeAccount.setBalance(oldBalance - cash);
}
state = 4;
}
}
// check provided by user data and proceed to the next step. Called by 2 methods above
private void nextStep()
{
switch (state)
{
case 0:
activeAccount = findAccount(textBox1.Text);
if (activeAccount != null) // if account found, go to the next step
{
textBox1.Text = "Enter your pin here";
screen1();
pinTry = 4;
}
else // if account was not found, program stays in the same state
{
textBox1.Text = "Insert your card here";
text[4].Text = "Wrong card";
}
break;
case 1:
try
{
int input = Convert.ToInt32(IsDigitsOnly(textBox1.Text));
if (activeAccount.checkPin(input)) // if entered pin is correct
{
textBox1.Text = "";
textBox1.PasswordChar = '\0';
screen2();
}
else // if pin is wrong
{
pinFail();
}
}
catch (Exception) // if pin is wrong
{
pinFail();
}
break;
case 6:
//Take user input and deposit it into their acount
try
{
int depositValue = Convert.ToInt32(IsDigitsOnly(textBox1.Text));
if (depositValue != 0) //Checks if deposit value is
{
int oldBal = activeAccount.getBalance();
Thread.Sleep(3000);
activeAccount.setBalance(oldBal + depositValue);
activeAccount.Unlock();
//Go to stage 2
textBox1.Text = "";
textBox1.PasswordChar = '\0';
screen2();
}
else
{
textBox1.Text = "Invalid value";
}
}
catch (Exception) // if user input causes error
{
textBox1.Text = "Invalid value";
}
break;
case 7:
//read the amount of money provided by user to the taken from account
int userCash = Convert.ToInt32(IsDigitsOnly(textBox1.Text));
if (userCash % 5 == 0) // amount must be devisible by 5
{
if (datarace)
{
takeCashTrue(userCash);
}
else
{
takeCashFalse(userCash);
}
}
else
{
textBox1.Text = "";
label1.Text = "Enter Amount\n Invalid number";
}
break;
default:
textBox1.Text = "";
break;
}
}
