public void Redeem(Invoice invoice, int numberOfDays)
{
// defensive programming
if(invoice == null) throw new ArgumentNullException("invoice");
if(numberOfDays <= 0) throw new ArgumentException("","numberOfDays");
// logging
Console.WriteLine("Redeem: {0}", DateTime.Now);
Console.WriteLine("Invoice: {0}", invoice.Id);
_exceptionHandler.Wrapper(() =>
{
_transactionManager.Wrapper(() =>
{
var pointsPerDay = 10;
if (invoice.Vehicle.Size >= Size.Luxury)
pointsPerDay = 15;
var points = numberOfDays*pointsPerDay;
_loyaltyDataService.SubtractPoints(invoice.Customer.Id, points);
invoice.Discount = numberOfDays*invoice.CostPerDay;
// logging
Console.WriteLine("Redeem complete: {0}", DateTime.Now);
});
});
}
public void Redeem(Invoice invoice, int numberOfDays)
{
var pointsPerDay = 10;
if (invoice.Vehicle.Size >= Size.Luxury)
pointsPerDay = 15;
var points = numberOfDays*pointsPerDay;
_dataService.SubtractPoints(invoice.Customer.Id, points);
invoice.Discount = numberOfDays*invoice.CostPerDay;
}
public void Redeem(Invoice invoice, int numberOfDays)
{
// defensive programming
if(invoice == null) throw new ArgumentNullException("invoice");
if(numberOfDays <= 0)
throw new ArgumentException("","numberOfDays");
// logging
Console.WriteLine("Redeem: {0}", DateTime.Now);
Console.WriteLine("Invoice: {0}", invoice.Id);
// exception handling
try
{
// start new transaction
using (var scope = new TransactionScope())
{
// retry up to three times
var retries = 3;
var succeeded = false;
while (!succeeded)
{
try
{
var pointsPerDay = 10;
if (invoice.Vehicle.Size >= Size.Luxury)
pointsPerDay = 15;
var points = numberOfDays*pointsPerDay;
_dataService.SubtractPoints(invoice.Customer.Id, points);
invoice.Discount = numberOfDays*invoice.CostPerDay;
// complete transaction
scope.Complete();
succeeded = true;
// logging
Console.WriteLine("Redeem complete: {0}", DateTime.Now);
}
catch
{
// don't re-throw until the
// retry limit is reached
if (retries >= 0)
retries--;
else
throw;
}
}
}
}
catch(Exception ex)
{
if (!Exceptions.Handle(ex))
throw;
}
}
static void SimulateRemovingPoints(ILoyaltyRedemptionService service)
{
var invoice = new Invoice
{
Customer = new Customer
{
Id = Guid.NewGuid(),
Name = "Jacob Watson",
DateOfBirth = new DateTime(1977, 4, 15),
DriversLicense = "RR009911"
},
Vehicle = new Vehicle
{
Id = Guid.NewGuid(),
Make = "Cadillac",
Model = "Sedan",
Size = Size.Luxury,
Vin = "2BDI"
},
CostPerDay = 29.95m,
Id = Guid.NewGuid()
};
service.Redeem(invoice, 3);
}
