public void Redeem(Invoice invoice, int numberOfDays)
{
invoice.Game.IsBought = true;
var pointsPerDay = invoice.Game.IsPremium ? 8 : 5;
var points = numberOfDays*pointsPerDay;
invoice.User.Points -= points;
}
public void Redeem(Invoice invoice, int numberOfDays)
{
//defensive programming
if (invoice == null) throw new ArgumentNullException("invoice");
if (numberOfDays <= 0) throw new ArgumentException("", "numberOfDays");
//logging
_loggingService.Log(string.Format("Redemption time: {0}", DateTime.Now));
//exception handling
try
{
//transaction
using (var scope = new TransactionScope())
{
//reries
var retries = 3;
var succeeded = false;
while (!succeeded)
{
try
{
invoice.Game.IsBought = true;
var pointsPerDay = invoice.Game.IsPremium ? 8 : 5;
var points = numberOfDays*pointsPerDay;
invoice.User.Points -= points;
scope.Complete();
succeeded = true;
}
catch
{
if (retries >= 0)
retries--;
else
throw;
}
}
}
}
catch (Exception ex)
{
//handle exception
_loggingService.Log(string.Format("Exception: {0}", ex.Message));
}
//logging
_loggingService.Log(string.Format("Redemption completed: {0}", DateTime.Now));
}
public ActionResult PayByPoints(int id)
{
var game = _gamesDataAccess.GetById(id);
var invoice = new Invoice
{
User = _gamesDataAccess.User,
Game = game
};
_redemptionService.Redeem(invoice, 7);
return RedirectToAction("Index");
}