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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4.  
  5. internal class Program
  6. {
  7. 	public static void Main()
  8. 	{
  9. 		IRequestResponseFactory factory = new RequestResponseFactory();
  10.  
  11. 		var customerRequest = new CustomerRequest { Name = "Joe", Surname = "Bloggs" };
  12. 		var customerResponse = factory.ProcessRequest<CustomerRequest, CustomerResponse>(customerRequest);
  13.  
  14. 		var billRequest = new BillRequest { Amount = 100m };
  15. 		var billResponse = factory.ProcessRequest<BillRequest, BillResponse>(billRequest);
  16.  
  17. 		Console.WriteLine(billResponse.Success);
  18. 		Console.WriteLine(customerResponse.Success);
  19. 		Console.ReadKey();
  20. 	}
  21. }
  22.  
  23.  
  24. public class CustomerRequest : IRequestData<CustomerResponse>
  25. {
  26. 	public string Name { get; set; }
  27. 	public string Surname { get; set; }
  28. }
  29.  
  30. public class CustomerResponse
  31. {
  32. 	public bool Success { get; set; }
  33. }
  34. public class BillRequest : IRequestData<BillResponse>
  35. {
  36. 	public decimal Amount { get; set; }
  37. }
  38. public class BillResponse
  39. {
  40. 	public bool Success { get; set; }
  41. }
  42. public interface IRequestData<TResponse>
  43. {
  44. }
  45.  
  46. public interface IRequestHandler<TRequest, TResponse> where TRequest : IRequestData<TResponse>
  47. {
  48. 	TResponse ProcessRequest(TRequest request);
  49. }
  50.  
  51. public interface IRequestResponseFactory
  52. {
  53. 	TResponse ProcessRequest<TRequest, TResponse>(TRequest request) where TRequest : IRequestData<TResponse>;
  54. }
  55.  
  56.  
  57. class RequestResponseFactory : IRequestResponseFactory
  58. {
  59. 	private readonly Dictionary<Type, Type> _requestHandlerTypes;
  60.  
  61. 	public RequestResponseFactory()
  62. 	{
  63. 		_requestHandlerTypes =
  64. 			typeof(RequestResponseFactory).Assembly.GetTypes()
  65. 				.Where(t => !t.IsAbstract)
  66. 				.Select(t => new
  67. 				{
  68. 					HandlerType = t,
  69. 					RequestType = GetHandledRequestType(t)
  70. 				})
  71. 				.Where(x => x.RequestType != null)
  72. 				.ToDictionary(
  73. 					x => x.RequestType,
  74. 					x => x.HandlerType
  75. 				);
  76. 	}
  77.  
  78. 	private static Type GetHandledRequestType(Type type)
  79. 	{
  80. 		var handlerInterface = type.GetInterfaces()
  81. 			.FirstOrDefault(i =>
  82. 				i.IsGenericType &&
  83. 				i.GetGenericTypeDefinition() == typeof(IRequestHandler<,>));
  84.  
  85. 		return handlerInterface == null ? null : handlerInterface.GetGenericArguments()[0];
  86. 	}
  87.  
  88. 	public TResponse ProcessRequest<TRequest, TResponse>(TRequest request) where TRequest : IRequestData<TResponse>
  89. 	{
  90. 		if (!_requestHandlerTypes.ContainsKey(typeof(TRequest)))
  91. 			throw new ApplicationException("No handler registered for type: " + typeof(TRequest).FullName);
  92.  
  93. 		var handlerType = _requestHandlerTypes[typeof(TRequest)];
  94.  
  95. 		var handler = (IRequestHandler<TRequest, TResponse>)Activator.CreateInstance(handlerType);
  96.  
  97. 		return handler.ProcessRequest(request);
  98. 	}
  99. }
  100.  
  101.  
  102. public class CustomerRequestHandler : IRequestHandler<CustomerRequest, CustomerResponse>
  103. {
  104. 	public CustomerResponse ProcessRequest(CustomerRequest request)
  105. 	{
  106. 		return new CustomerResponse { Success = true };
  107. 	}
  108. }
  109.  
  110. public class BillRequestHandler : IRequestHandler<BillRequest, BillResponse>
  111. {
  112. 	public BillResponse ProcessRequest(BillRequest request)
  113. 	{
  114. 		return new BillResponse { Success = false };
  115. 	}
  116. }
  117.  
Success #stdin #stdout 0.05s 38224KB
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C# (gmcs 5.20.1)

					

					

						
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11 years ago

					

					

						
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