internal static InstanceRequestHookFactory From <TRequest>(
IRequestHook <TRequest> hook)
{
return(new InstanceRequestHookFactory(
hook,
new FunctionRequestHook((request, ct) => hook.Run((TRequest)request, ct))));
}
protected void AddRequestHook <TBaseRequest>(IRequestHook <TBaseRequest> hook)
{
if (!typeof(TBaseRequest).IsAssignableFrom(typeof(TRequest)))
{
throw new ContravarianceException(nameof(AddRequestHook), typeof(TBaseRequest), typeof(TRequest));
}
RequestHooks.Add(InstanceRequestHookFactory.From(hook));
}
/// <summary>
/// Adds a request hook instance.
/// </summary>
public void AddRequestHook(IRequestHook hook)
{
var hookType = hook.GetType();
var baseHookType = hookType
.GetBaseTypes()
.SingleOrDefault(x =>
x.IsGenericType && x.GetGenericTypeDefinition() == typeof(RequestHook <>));
if (baseHookType == null)
{
throw new ArgumentException($"Unable to add '{hookType}' as a request hook for '{typeof(TRequest)}'.\r\n" +
$"Request hooks must inherit RequestHook<TRequest>.");
}
var requestType = baseHookType.GenericTypeArguments[0];
if (!requestType.IsAssignableFrom(typeof(TRequest)))
{
throw new ContravarianceException(nameof(AddRequestHook), requestType, typeof(TRequest));
}
var factoryMethod = typeof(InstanceRequestHookFactory)
.GetMethod(nameof(InstanceRequestHookFactory.From), BindingFlags.NonPublic | BindingFlags.Static)
.MakeGenericMethod(requestType);
try
{
AddRequestHook((IRequestHookFactory)factoryMethod.Invoke(null, new object[] { hook }));
}
catch (TargetInvocationException e)
{
if (e.InnerException != null)
{
throw e.InnerException;
}
throw e;
}
}
