_AspNet_Mvc_DecoratingYourControllers

Decorating Your Controllers in ASP.NET MVC

Decorate your Controller action methods. All the usual rules having to do with routing and controller actions applies. Adding the decoration enables performance measurement filtering.

We can leverage some language features to make our lives a bit easier.

using static Discovery.MeasurementBoundary;

We have made an effort to provide a filter whose inputs are consistent with ad-hoc instrumentation. However, make no mistake, this is a different class.

[PerformanceMeasurementFilter(
    categoryType: typeof(MyPerformanceCounterCategoryAdapter)
    , adapterType: typeof(AverageTimePerformanceCounterAdapter)
    , otherAdapterTypes: new[] {typeof(TotalMemberAccessesPerformanceCounterAdapter)}
    , PublishCounters = true, PublishEvent = true, ThrowPublishErrors = true
    , Boundary = new[] {BeginAction, EndAction}
)]
public ActionResult Index()
{
    return View();
}

In this case, we organize a category via the type MyPerformanceCounterCategoryAdapter and with two counter adapters, AverageTimePerformanceCounterAdapter and TotalMemberAccessesPerformanceCounterAdapter. Several flags are also indicated, as well as the Boundary.

The MVC filter is similar to the Web API filter but not quite the same, and both are very similar to the ad-hoc attribute. The MVC filter adds the ability to specify boundaries around action and/or result.

Synchronous as well as asynchronous methods are also supported.