public string HandleRequest(ILoanRequest request)
{
//A clerk can approve amount upto Rs 10,000
if (request.Amount <= 1000)
return "Amount Approved by Clerk";
else
Console.WriteLine("Loan request cannot be approved by ");
//Else Clerk cannot approve,so pass it to the next successor
return Successor.HandleRequest(request);
}
//There is no successor to the Super Manager
public string HandleRequest(ILoanRequest request)
{
if (request.Amount <=100000)
{
return "Request approved by Super Manager";
}
else
{
throw new Exception("Bank can approve loan only uptill one lakh. Loan cannot be granted for amounts greater than 1 lac");
}
}
public static string TrySuccessor(this IRequestHandler current, ILoanRequest request)
{
if (current.Successor == null)
{
return "There is no next successor";
}
else
{
Console.WriteLine("Cannot process the request. Passing it onto the next successor");
return current.Successor.HandleRequest(request);
}
}
/// <summary>
/// Calculates the response.
/// </summary>
/// <param name="request">Loan request object</param>
/// <returns>Loan response object</returns>
public ILoanResponse Calculate(ILoanRequest request)
{
Engine engine = new Engine();
List <Offer> workingOffers = engine.SelectOffers(request.Offers, request.LoanAmount);
LoanResponse response = new LoanResponse();
response.RequestedAmount = request.LoanAmount;
response.Rate = engine.GetAnnualRate(workingOffers, request.LoanAmount);
response.TotalRepayment = engine.GetTotalRepayment(workingOffers);
response.MounthlyRepayment = engine.GetMonthlyRepayment(workingOffers, response.TotalRepayment);
return(response);
}
public string HandleRequest(ILoanRequest request)
{
//A Manager can approve amount upto Rs 50,000
if (request.Amount <= 5000)
return "Request approved by Manager";
else
{
//Else Clerk cannot approve,so pass it to the next successor which is Super Manager
//return Successor.HandleRequest(request);
//Other than the above line we can also use
return this.TrySuccessor(request);
}
}
//This method will be called by Managed Extensibility Framework
public bool HandleRequestMEF(ILoanRequest request)
{
//A clerk can approve amount upto Rs 10,000
if (request.Amount <= 1000)
{
Console.WriteLine("Your loan request for amount {0} has been approved by {1} ", request.Amount,
this.GetType().ToString());
return true;
}
else
{
return false;
}
}
/// <summary>
/// Validates a given request according to existing rules and limitations.
/// </summary>
/// <param name="request">Loan request object</param>
public void ValidateRequest(ILoanRequest request)
{
if (request.LoanAmount < configProvider.AmountMin || request.LoanAmount > configProvider.AmountMax)
{
throw new ArgumentOutOfRangeException("Amount");
}
if (request.LoanAmount % 100 != 0)
{
throw new ArgumentException("The requested amount should be divisible by 100");
}
if (request.Offers.Sum(o => o.Amount) < request.LoanAmount)
{
throw new AmountNotAvailableException("The requested amount is not available");
}
}
//Handle the request as it comes. Pass the request object and the name of the handler that will first process the request
private bool TryHandle(IRequestHandler requestHandler, ILoanRequest request)
{
//Find if the curent request handler has got any Successor. If it has than assign the successor
var firstOrDefault =
Handlers.FirstOrDefault(handle => handle.Metadata.SuccessorOf == requestHandler.GetType());
//Handle the request first. If it gets handled, nothing to do
if (requestHandler.HandleRequestMEF(request))
{
return true;
}
//Reques did not get handled, try passing it on to the Successor
else if (firstOrDefault != null)
{
requestHandler.Successor = firstOrDefault.Value;
//Call the method again to process the request and set the successor, if there is any
return TryHandle(requestHandler.Successor, request);
}
else
{
return false;
}
}
//This method exposes the public interface for handling the request
public bool HandleRequest(ILoanRequest request)
{
return TryHandle(first, request);
}
