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.Now.Ticks;
MemoryCacheEntry entry = timedItems.Peek();
while (entry != null)
{
if (entry.Disabled)
{
timedItems.Dequeue();
entry = timedItems.Peek();
continue;
}
if (entry.ExpiresAt > now)
{
break;
}
timedItems.Dequeue();
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();
}
}
}
// NOTE: this method _MUST_ be called with the write lock held
void UpdateExpirable(MemoryCacheEntry entry)
{
if (timedItems == null)
{
timedItems = new MemoryCacheEntryPriorityQueue();
}
timedItems.Enqueue(entry);
if (expirationTimer == null)
{
expirationTimer = new Timer(RemoveExpiredItems, null, owner.TimerPeriod, owner.TimerPeriod);
}
}
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 ();
}
}
// NOTE: this method _MUST_ be called with the write lock held
void UpdateExpirable (MemoryCacheEntry entry)
{
if (timedItems == null)
timedItems = new MemoryCacheEntryPriorityQueue ();
timedItems.Enqueue (entry);
if (expirationTimer == null)
expirationTimer = new Timer (RemoveExpiredItems, null, owner.TimerPeriod, owner.TimerPeriod);
}
