/// <summary>Determines if we can expire cache.</summary>
/// <returns>true if it succeeds, false if it fails.</returns>
public static bool ExpireCache()
{
try
{
if (SharedLock.TryAcquireLock(ref SharedLock.ExpireCacheLock))
{
// Change the next schedule, so other threads will not try to expire the cache
Configuration.ExpireCacheNextScheduled = DateTime.Now.Add(Configuration.ExpireCacheDelay);
// EXPIRE delegate cache
{
var expireDateDelegate = DateTime.Now.Subtract(Configuration.SlidingExpirationDelegate);
var keyToRemoves = new List <string>();
foreach (var bucket in CacheDelegate.Buckets)
{
try
{
bucket.AcquireLock();
foreach (var keyvalue in bucket.InnerDictionary)
{
if (keyvalue.Value.LastAccess < expireDateDelegate)
{
keyToRemoves.Add(keyvalue.Key);
}
}
foreach (var key in keyToRemoves)
{
bucket.InnerDictionary.Remove(key);
}
}
finally
{
bucket.ReleaseLock();
}
}
}
// EXPIRE item cache
{
var expireDateItem = DateTime.Now.Subtract(Configuration.SlidingExpirationItem);
var keyToRemoves = new List <int>();
foreach (var bucket in CacheItem.Buckets)
{
try
{
bucket.AcquireLock();
foreach (var keyvalue in bucket.InnerDictionary)
{
if (keyvalue.Value.LastAccess < expireDateItem)
{
keyvalue.Value.IsCached = false;
keyToRemoves.Add(keyvalue.Key);
}
}
foreach (var key in keyToRemoves)
{
bucket.InnerDictionary.Remove(key);
}
}
finally
{
bucket.ReleaseLock();
}
}
}
return(true);
}
return(false);
}
finally
{
SharedLock.ReleaseLock(ref SharedLock.ExpireCacheLock);
}
}