public void UpdateCustomer(Customer customer)
{
if (customer.Id == null)
{
throw new InvalidOperationException("cannot update a new customer");
}
var customerId = customer.Id.GetValueOrDefault();
customer.CreateCheckPoint();
var keyToRemove = customer.CheckPointHistory.Last().Key;
// cloning the object to separate it from the original - thereby simulating a real-life data insertion
var clone = (Customer)customer.CurrentCheckPoint;
if (!CustomerData.ContainsKey(customerId))
{
throw new InvalidOperationException("customer not found");
}
CustomerData[customerId] = clone;
//get rid of checkpoint
customer.CheckPointHistory.Remove(keyToRemove);
}
