/// <summary>
/// </summary>
/// <param name="sender"> </param>
/// <param name="e"> </param>
protected internal virtual void OnItemExpired(object sender, ItemExpiredEventArgs <T> e)
{
if (sender == null)
{
throw new ArgumentNullException("sender");
}
if (e == null)
{
throw new ArgumentNullException("e");
}
if (_itemExpired != null)
{
_itemExpired(sender, e);
}
}
/// <summary>
/// </summary>
/// <param name="arguments"> </param>
public static void ExpirationCallback(CacheEntryRemovedArguments arguments)
{
if (arguments == null)
{
throw new ArgumentNullException("arguments");
}
// ItemExpiredEventArgs eventArgs = new ItemExpiredEventArgs(removedKey, expiredValue, removalReason);
var eventArgs = new ItemExpiredEventArgs <T>(arguments.CacheItem.Key
, (T)arguments.CacheItem.Value
, arguments.RemovedReason);
Trace.WriteLine(string.Format("Item {0} was {1} from cache."
, arguments.CacheItem.Value.GetType().Name
, arguments.RemovedReason.ToString()
, TraceCategory.Caching.ToString()));
if (arguments.RemovedReason == CacheEntryRemovedReason.Expired)
{
Trace.WriteLine(string.Format("Cache has {0} items before callback: {1} was {2} from cache."
, Cache <string, T> .Count
, arguments.CacheItem.Value.GetType().Name
, arguments.RemovedReason.ToString()
, TraceCategory.Caching.ToString()));
lock (_itemExpiredLock)
{
Trace.WriteLine(string.Format("{0}: {1} {2} {3}"
, arguments.RemovedReason.ToString()
, arguments.CacheItem.Key
, arguments.CacheItem.Value.GetType().Name
, "callback started. ")
, TraceCategory.Caching.ToString());
//Trace.WriteLine(string.Format("Cache has {0} items after pruning. ", Cache<string, object>.Count));
// testing, filter out critical cache values and refresh them
// need to run tests to see if dependencies perform better (memory-wise)
if (arguments.CacheItem.Value.GetType() == typeof(ChannelData))
{
arguments.CacheItem.Value = new ChannelListLoader <IChannel>().LoadPlaylist(true);
arguments.CacheItem.Key =
arguments.CacheItem.Value.GetHashCode().ToString(CultureInfo.InvariantCulture);
Cache <string, T> .Insert(arguments.CacheItem.Key, (T)arguments.CacheItem.Value);
}
}
Trace.WriteLine(string.Format("{0}: {1} {2} {3}"
, arguments.RemovedReason.ToString()
, arguments.CacheItem.Key
, arguments.CacheItem.Value.GetType().Name
, "callback completed. "), TraceCategory.Caching.ToString());
Trace.WriteLine(string.Format("Cache has {0} items after callback. ", Cache <string, T> .Count)
, TraceCategory.Caching.ToString());
// raise the event; can use this elsewhere to trigger callbacks, which YOU SHOULD DO!
if (_itemExpired != null)
{
_itemExpired(default(T), eventArgs);
}
}
}
