long DoRemoveExpiredItems(bool needLock)
{
long count = 0;
bool locked = false;
try {
if (needLock)
{
cache_lock.EnterWriteLock();
locked = true;
}
if (timedItems == null)
{
return(0);
}
long now = DateTime.UtcNow.Ticks;
MemoryCacheEntry entry = timedItems.Peek();
while (entry != null)
{
if (entry.Disabled)
{
timedItems.Dequeue();
entry = timedItems.Peek();
continue;
}
if (entry.ExpiresAt > now)
{
break;
}
timedItems.Dequeue();
if (entry.IsSliding && entry.ExpiresAtNext > now)
{
entry.ResetSlidingExpiry();
timedItems.Enqueue(entry);
break;
}
count++;
DoRemoveEntry(entry, true, entry.Key, CacheEntryRemovedReason.Expired);
entry = timedItems.Peek();
}
if (entry == null)
{
timedItems = null;
expirationTimer.Dispose();
expirationTimer = null;
}
return(count);
} finally {
if (locked)
{
cache_lock.ExitWriteLock();
}
}
}