Beispiel #1
0
        /// <summary>
        /// This method takes paymet as an input, Process the payment and returns list of actions performed during processing of the payment
        /// </summary>
        /// <param name="payment"></param>
        /// <returns></returns>
        public List <string> ProcessPayment(Payment payment)
        {
            //Create a payment context object
            PaymentContext paymentContext = new PaymentContext
            {
                Payment = payment
            };

            //Create list of IRules instance defined in this assembly
            List <Type> ruleTypes = Assembly.GetExecutingAssembly().GetTypes().Where(type => type.GetInterfaces().Contains(typeof(IRule))).ToList();

            //stores object of IRule type
            List <IRule> rules = new List <IRule>();

            foreach (var ruleType in ruleTypes)
            {
                //Create a instance of IRule type defined
                rules.Add((IRule)Activator.CreateInstance(ruleType));
            }

            //For each rule process the payment context if processing precondition satisfied
            foreach (var rule in rules)
            {
                //check if pre condition is satisfied
                if (rule.ShouldProcess(paymentContext))
                {
                    //do processing
                    rule.Process(paymentContext);
                }
            }

            return(paymentContext.GetActionPerformed());
        }