public Task <T> Run <T>(IActivity <T> level)
{
var oldLevel = activityStack.LastOrDefault();
if (oldLevel != null)
{
using (oldLevel.Activate())
oldLevel.Level.Deactivated();
}
currentActivity = new ActivityRuntime(level);
activityStack.Push(currentActivity);
using (currentActivity.Activate())
{
level.Started();
level.Activated();
return(level.Run().ContinueWith(t =>
{
using (currentActivity.Activate())
{
level.Deactivated();
level.Completed();
}
currentActivity = oldLevel;
if (oldLevel != null)
{
using (oldLevel.Activate())
oldLevel.Level.Activated();
}
return t.Result;
}, TaskScheduler.FromCurrentSynchronizationContext()));
}
}