/// <summary>
/// Inserting coints to the machine. Saving them in order buffer
/// </summary>
/// <param name="amount">Amount of coins inserted</param>
/// <returns></returns>
public Money InsertCoin(Money amount)
{
if (!MoneyHelper.ValidateInsertedCoin(amount))
{
throw new ArgumentException("Coin not supported");
}
var _backedBuffer = _moneyHolder.GetBufferedAmount();
try
{
_moneyHolder.AddBufferedAmount(amount);
return(_moneyHolder.GetBufferedAmount());
}
catch (Exception ex)
{
// in case of calculation failed revert buffer to previous state
// and throw exception
_moneyHolder.SetBuffedAmount(_backedBuffer);
throw ex;
}
}