private void RequestCachePruning()
{
lock (this)
{
if (_cachePruningTimer != null || _cachePruningTimestamp.Add(CachePruningInterval) >= DateTime.UtcNow)
{
return;
}
Deployment.Current.Dispatcher.BeginInvoke(() =>
{
if (_cachePruningTimer != null)
{
return;
}
_cachePruningTimer = OneShotDispatcherTimer.CreateAndStart(CachePruningTimerDuration, OnCachePruningTimerFired);
});
}
}
/// <summary>
/// Creates a new <see cref="OneShotDispatcherTimer"/> and starts it.
/// </summary>
/// <param name="duration">The duration of the timer.</param>
/// <param name="callback">The delegate that will be called when the timer fires.</param>
/// <returns>The newly created timer.</returns>
public static OneShotDispatcherTimer CreateAndStart(TimeSpan duration, EventHandler callback)
{
OneShotDispatcherTimer timer = new OneShotDispatcherTimer();
timer.Duration = duration;
timer.Fired += callback;
timer.Start();
return timer;
}
private void OnCachePruningTimerFired(object sender, EventArgs e)
{
if (sender != _cachePruningTimer)
{
return;
}
_cachePruningTimer = null;
_cachePruningTimestamp = DateTime.UtcNow;
ThreadPool.QueueUserWorkItem((state) => { PruneCache(); });
}
