/// <summary>
/// This is entry point of rule engine.This class dynamically invokes method based on selected rules
/// </summary>
/// <param name="paymentInfo"></param>
public List <string> ProcessPayment(PaymentInfo paymentInfo)
{
List <string> methodList = new List <string>();
var qualifiedRules = new RuleEvaluator().EvaluateQualifyingRules(paymentInfo);
StringBuilder sb = new StringBuilder();
foreach (Rule rule in qualifiedRules)
{
sb.Append(rule.MethodName);
}
methodList = sb.ToString().Split(';').ToList();
var methodCount = methodList.Count;
methodList.RemoveAt(--methodCount);
List <string> finalResult = new List <string>();
//Dynamically invoking methods
foreach (string methodName in methodList)
{
MethodExecutor me = new MethodExecutor();
Type methodType = me.GetType();
MethodInfo method = methodType.GetMethod(methodName);
object result = method.Invoke(me, new object[] { paymentInfo.PaymentId });
finalResult.Add(result.ToString());
}
return(finalResult);
}
static void Main(string[] args)
{
//setup our DI
//var serviceProvider = new ServiceCollection()
//
// .AddTransient<IRule, ActivateMembershipRule>()
// .AddTransient<IRule, FreeFirstAidVideoRule>()
// .AddTransient<IRule, GenerateCommisionPaymentRule>()
// .AddTransient<IRule, GenerateDuplicatePackingSlipRule>()
// .AddTransient<IRule, GeneratePackingSlipRule>()
// .AddTransient<IRule, UpgradeMembershipRule>()
// .BuildServiceProvider();
var ruleEvaluator = new RuleEvaluator(new List <IRule>
{
new ActivateMembershipRule(),
new UpgradeMembershipRule(),
new FreeFirstAidVideoRule(),
new GenerateCommisionPaymentRule(),
new GeneratePackingSlipRule(),
new GenerateDuplicatePackingSlipRule()
});
ruleEvaluator.Evaluate(new Payment
{
Products = new List <Product>
{
new Product {
Name = "A physical product",
Category = new ProductCategory
{
Type = ProductType.Physical,
Name = Guid.NewGuid().ToString()
},
},
new Product {
Name = "Learning to Ski",
Category = new ProductCategory
{
Type = ProductType.Abstract,
Name = "Video"
}
},
new Product {
Name = "A Book",
Category = new ProductCategory
{
Type = ProductType.Abstract,
Name = "Book"
},
}
}
});
}
