public override Task<HttpResponseMessage> ExecuteAsync(HttpControllerContext controllerContext, CancellationToken cancellationToken)
{
//We cannot run the Initialize method here to prevent any inconsistency
//because ExecuteAsync method doesn't like Request to be not null.
//For example, Initialize method sets up some public Properties such as
//ControllerContext, Request and Configuration. If the user tries to reach out to them
//inside the OnControllerExecuting method and we don't run the Initialize, there
//will be NullReferenceExceptions which is very bad. But we cannot set Request
//as well. So, set ControllerContext and Configuration at least
ControllerContext = controllerContext;
Configuration = controllerContext.Configuration;
HttpControllerExecutingContext controllerExecutingContext = new HttpControllerExecutingContext(controllerContext);
try {
//If the user try to reach out to the public Request property,
//that property will be null because we cannot set that value before
//the ExecuteAsync method is run. So, it shouldn't be used.
OnControllerExecuting(controllerExecutingContext);
}
catch (Exception e) {
OnControllerExecuted(null);
return TaskHelpers.FromError<HttpResponseMessage>(e);
}
//Set the response message if the response coming from OnControllerExecuting is not null
//and OnControllerExecuting is successfully completed
if (controllerExecutingContext.Response != null) {
OnControllerExecuted(controllerExecutingContext.Response);
return TaskHelpers.FromResult<HttpResponseMessage>(controllerExecutingContext.Response);
}
//TODO: Handle this better. E.g: What happens when an exception is thrown?
return base.ExecuteAsync(controllerContext, cancellationToken).ContinueWith(task => {
var response = task.Result;
OnControllerExecuted(response);
return response;
});
}
/// <summary>
/// The method which will run just before the controller execution.
/// If this method sets HttpControllerExecutingContext.Response property to a non-null
/// value, then the controller execution will be terminated and the given response
/// message will be pass through.
/// </summary>
/// <param name="controllerExecutingContext"></param>
public virtual void OnControllerExecuting(HttpControllerExecutingContext controllerExecutingContext)
{
}
public override void OnControllerExecuting(HttpControllerExecutingContext controllerExecutingContext)
{
_onControllerExecutingInvoked = true;
}
public override void OnControllerExecuting(HttpControllerExecutingContext controllerExecutingContext)
{
_onControllerExecutingInvoked = true;
controllerExecutingContext.Response = new HttpResponseMessage(HttpStatusCode.NotAcceptable);
}
public override void OnControllerExecuting(HttpControllerExecutingContext controllerExecutingContext)
{
_onControllerExecutingInvoked = true;
throw new NotImplementedException();
}
