private static void Main(string[] args)
{
var db = new ATMData();
db.SaveChanges();
var entry = db.CardAccounts.All().First();
var moneyFromATM = PayMoney(entry.Cardnumber, entry.CardPIN, 1000);
}
private static void SaveTranToLog(string cardNumber, decimal oldAmount, decimal newAmount)
{
using (var db=new ATMData())
{
using (var tranScope = new TransactionScope(TransactionScopeOption.Required,new TransactionOptions(){IsolationLevel = IsolationLevel.RepeatableRead}))
{
db.WithdrawalLogs.Add(
new WithdrawalLog
{
CardNumber = cardNumber,
NewBalance = newAmount,
OldBalance = oldAmount
});
db.SaveChanges();
tranScope.Complete();
}
}
}
private static decimal PayMoney(string cardNumber, string cardPin, decimal amount)
{
var db = new ATMData();
decimal result = 0;
using (var tranScope = new TransactionScope(TransactionScopeOption.Required,new TransactionOptions(){IsolationLevel = IsolationLevel.RepeatableRead}))
{
using (db)
{
Console.WriteLine("Transaction started");
try
{
var account = db.CardAccounts.Find(cardNumber);
if (account.CardPIN != cardPin)
{
throw new InvalidOperationException("The PIN provided was not correct !");
}
account.CardCash -= amount; //The validation is in the ATMEntities class !!!
db.SaveChanges();
SaveTranToLog(cardNumber, account.CardCash + amount, account.CardCash);
tranScope.Complete();
result = amount;
Console.WriteLine(
"The withdrawal from account {0} was successful. Transfered sum: {1}",
cardNumber,
amount);
}
catch (Exception e)
{
Console.WriteLine("Something went wrong during the transaction: {0}", e.Message);
}
Console.WriteLine("Transaction terminated");
return result;
}
}
}