static WorkflowInterfaceInfo()
{
operationNames = new VirtualArray <Type, VirtualArray <Type, List <string> > >();
List <string> validationMessages = new List <string>();
if (!typeof(TWorkflowInterface).IsInterface)
{
validationMessages.Add($"TWorkflowInterface type '{typeof(TWorkflowInterface).GetFriendlyName()}' must be an interface!");
}
// Valid method signatures:
// Task <...> ...(Func<Task<...>> requestResult)
// Task ...(Func<Task<...>> requestResult)
// Task <...> ...(Func<Task> requestResult)
// Task ...(Func<Task> requestResult)
foreach (MethodInfo method in OperationInfo <TWorkflowInterface> .OperationMethods)
{
Type responseParameterType = typeof(void);
Type returnType = method.ReturnType;
if (returnType != typeof(Task) &&
!returnType.IsGenericTypeOf(typeof(Task <>)))
{
validationMessages.Add($"TWorkflowInterface '{method.DeclaringType.GetFriendlyName()}' method '{method.Name}' return type must be Task or Task<...>!");
}
else if (returnType.IsGenericType)
{
responseParameterType = returnType.GetGenericArguments()[0];
}
Type requestResultType = typeof(void);
ParameterInfo[] parameters = method.GetParameters();
if (parameters.Length != 1)
{
validationMessages.Add($"TWorkflowInterface '{method.DeclaringType.GetFriendlyName()}' method '{method.Name}' must have 1 parameter!");
}
if (parameters.Length >= 1)
{
Type parameterType = parameters[0].ParameterType;
if (parameterType != typeof(Func <Task>) &&
(!parameterType.IsGenericTypeOf(typeof(Func <>)) ||
!parameterType.GetGenericArguments()[0].IsGenericTypeOf(typeof(Task <>))))
{
validationMessages.Add($"TWorkflowInterface '{method.DeclaringType.GetFriendlyName()}' method '{method.Name}' parameter type must be Func<Task> or Func<Task<...>>!");
}
else if (parameterType.GetGenericArguments()[0].IsGenericType)
{
requestResultType = parameterType.GetGenericArguments()[0].GetGenericArguments()[0];
}
}
operationNames[requestResultType][responseParameterType].Add(OperationInfo <TWorkflowInterface> .GetOperationName(method));
}
IsValidWorkflowInterface = validationMessages.Count() == 0;
if (!IsValidWorkflowInterface)
{
StringBuilder sb = new StringBuilder();
foreach (string validationMessage in validationMessages)
{
sb.AppendLine(validationMessage);
}
ValidationMessage = sb.ToString();
operationNames.Clear();
}
}
