//Execute a given transaction, logs the transaction, and invoke the balancewarning
//if the users balance gets under 50
private T ExecuteTransaction <T>(T transaction) where T : Transaction
{
try
{
transaction.Execute();
_transactions.Add(transaction);
LogTransaction(transaction, "Completed");
if (transaction.User.Balance <= 50)
{
UserBalanceWarning?.Invoke(transaction.User, transaction.User.Balance);
}
return(transaction);
}
catch (DeactivatedProductExcetion ex)
{
LogTransaction(transaction, $"Failed: {ex.Message}");
throw;
}
catch (InsufficientCreditsException ex)
{
LogTransaction(transaction, $"Failed: {ex.Message}");
throw;
}
}
public void WarnUserOfLowBalance(decimal amount)
{
foreach (IUser user in Users)
{
UserBalanceWarning?.Invoke(user, amount);
}
}
private void OnUserBalanceChangedEvent(IUser user)
{
if (user.Balance < 50)
{
UserBalanceWarning?.Invoke(user);
}
}
private void SubscribeEvents()
{
foreach (IUser user in Users)
{
user.LowFundsWarning += (amount) => UserBalanceWarning?.Invoke(user, amount);
}
}
//Helper function for executing both kinds of transactions, while adding them to the log file
private void ExecuteTransaction(Transaction transaction)
{
transaction.Execute();
if (transaction.User.Balance <= 50)
{
UserBalanceWarning?.Invoke(transaction.User, transaction.User.Balance);
}
WriteToLogFile(transaction);
allTransactions.Add(transaction);
}
//Find the user with the given username
public User GetUserByUsername(string username)
{
User user = _users.Find(p => p.Username == username);
if (user != null)
{
if (user.Balance < 50)
{
UserBalanceWarning?.Invoke(user, user.Balance);
}
return(user);
}
throw new UserNotFoundException("User was not found", username);
}
public bool ExecuteTransaction(Transaction trans)
{
bool success = trans.Execute();
if (success == true)
{
if (trans.User.Balance <= 50)
{
UserBalanceWarning?.Invoke(trans.User, trans.User.Balance);
}
using (System.IO.StreamWriter file =
new System.IO.StreamWriter(@"Data\Transactions.txt", true))
{
file.WriteLine(trans.LogToString());
}
DaAccess.Add(trans);
}
return(success);
}
public delegate void UserBalanceNotification(object source, int balance); // delegate to pass when user balance fall below critical levels
protected virtual void OnUserBalanceWarning(int balance)
{
UserBalanceWarning?.Invoke(this, balance);
}
protected virtual void OnUserBalanceWarning(User user)
{
UserBalanceWarning?.Invoke(user, user.Balance);
}
protected virtual void OnUserBalanceNotification(LowBalanceEventArgs e)
{
UserBalanceWarning?.Invoke(this, e);
}