private static void HandleExpiration <T>(HttpCacheShim that
, CacheAddParameters <T> parameters
, string cacheKey
, CacheItemUpdateReason reason
, out object expensiveObject
, out CacheDependency dependency
, out DateTime absoluteExpiration
, out TimeSpan slidingExpiration)
where T : class
{
Log("Expired", () => "(" + reason + ") " + cacheKey);
expensiveObject = null;
dependency = null;
absoluteExpiration = Cache.NoAbsoluteExpiration;
slidingExpiration = Cache.NoSlidingExpiration;
// if we were not shutting down, might want to handle the reuse/refresh
if (reason == CacheItemUpdateReason.Expired &&
!AppDomain.CurrentDomain.IsFinalizingForUnload())
{
if (parameters.ShouldScheduleRefresh &&
HttpCacheShim.DisableBackfill == false &&
!BackgroundQueue.IsBacklogged())
{
// we need queue a request to the underlying store to get more current data into the cache so it stays primed.
BackgroundQueue.Enqueue(parameters);
}
}
}