public Customer GetCustomerById(int id)
{
var cached = _customerRepository.FindByPK(id);
if (cached != null)
{
return(cached);
}
var webserviceData = Webservice.GetData(id); // You could inject the web service as well...
var customer = ConvertDataToCustomer(webserviceData);
_customerRepository.SaveCustomer(customer);
return(customer);
}