/// <summary>
/// Method called before the action method starts processing
/// </summary>
/// <param name="filterContext">An ActionExecutingContext object</param>
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
// First thing is to check if performance is enabled globally. If not, return
if (ConfigInfo.Value.PerformanceEnabled == false)
{
return;
}
// Second thing, check if performance tracking has been turned off for this action
// If the DoNotTrackAttribute is present, then return
ActionDescriptor actionDescriptor = filterContext.ActionDescriptor;
if (actionDescriptor.GetCustomAttributes(typeof(DoNotTrackPerformanceAttribute), true).Length > 0 ||
actionDescriptor.ControllerDescriptor.GetCustomAttributes(typeof(DoNotTrackPerformanceAttribute), true).Length > 0)
{
return;
}
// ActionInfo encapsulates all the info about the action being invoked
ActionInfo info = this.CreateActionInfo(filterContext);
// PerformanceTracker is the object that tracks performance and is attached to the request
PerformanceTracker tracker = new PerformanceTracker(info);
// Store this on the request
String contextKey = this.GetUniqueContextKey(filterContext.ActionDescriptor.UniqueId);
HttpContext.Current.Items.Add(contextKey, tracker);
// Process the action start - this is what starts the timer and increments any
// required counters before the action executes
tracker.ProcessActionStart();
}
/// <summary>
/// Method that runs before the Web API action is invoked
/// </summary>
/// <param name="actionContext">An HttpActionContext with info about the action that is executing</param>
public override void OnActionExecuting(HttpActionContext actionContext)
{
// First thing is to check if performance is enabled globally
if (ConfigInfo.Value.PerformanceEnabled == false)
{
return;
}
// Second thing is to check if performance tracking has been turned off for this action
// If the DoNotTrackAttribute is present, then we set a flag not to track performance and return
HttpActionDescriptor actionDescriptor = actionContext.ActionDescriptor;
if (actionDescriptor.GetCustomAttributes <DoNotTrackPerformanceAttribute>().Count > 0 ||
actionDescriptor.ControllerDescriptor.GetCustomAttributes <DoNotTrackPerformanceAttribute>().Count > 0)
{
return;
}
// ActionInfo encapsulates all the info about the action being invoked
ActionInfo info = this.CreateActionInfo(actionContext);
// PerformanceTracker is the object that tracks performance and is attached to the request
PerformanceTracker tracker = new PerformanceTracker(info);
// Store this on the request
actionContext.Request.Properties.Add(this.GetType().FullName, tracker);
// Process the action start - this is what starts the timer and increments any
// required counters before the action executes
tracker.ProcessActionStart();
}
/// <summary>
/// Method called after the action method has completed executing
/// </summary>
/// <remarks>
/// This method first checks to make sure we are indeed tracking performance. If so, it stops
/// the stopwatch and then calls the OnActionComplete() method of all of the performance metric
/// objects attached to this action filter
/// </remarks>
/// <param name="filterContext">An ActionExecutedConext object</param>
public override void OnActionExecuted(ActionExecutedContext filterContext)
{
// This is the unique key the PerformanceTracker object would be stored under
String contextKey = this.GetUniqueContextKey(filterContext.ActionDescriptor.UniqueId);
// Check if there is an object on the request. If not, must not be tracking performance
// for this action, so just go ahead and return
if (HttpContext.Current.Items.Contains(contextKey) == false)
{
return;
}
// If we are here, we are tracking performance. Extract the object from the request and call
// ProcessActionComplete. This will stop the stopwatch and update the performance metrics
PerformanceTracker tracker = HttpContext.Current.Items[contextKey] as PerformanceTracker;
if (tracker != null)
{
bool exceptionThrown = (filterContext.Exception != null);
tracker.ProcessActionComplete(exceptionThrown);
}
}
/// <summary>
/// Method that executes after the WebAPI action has completed
/// </summary>
/// <param name="actionExecutedContext">An HttpActionExecutedContext object with info about the action that just executed</param>
public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext)
{
String key = this.GetType().FullName;
// Check the request properties for the PerformanceTracker object. If it does not exist
// then performance isn't being tracked on this action, so just return
if (actionExecutedContext.Request.Properties.ContainsKey(key) == false)
{
return;
}
// Get the PerformanceTrcker object
PerformanceTracker tracker = actionExecutedContext.Request.Properties[key] as PerformanceTracker;
// Make sure the object isn't null (failed cast). ProcessActionComplete stops the stopwach
// and updates the performance counters
if (tracker != null)
{
bool exceptionThrown = (actionExecutedContext.Exception != null);
tracker.ProcessActionComplete(exceptionThrown);
}
}
