private void EvictAboveSize(
long desiredSize,
EvictionReason reason)
{
ICollection <IEntry> entries;
try
{
entries = GetSortedEntries(_storage.GetEntries());
}
catch (IOException ioe)
{
_cacheErrorLogger.LogError(
CacheErrorCategory.EVICTION,
typeof(DiskStorageCache),
"evictAboveSize: " + ioe.Message);
throw;
}
long cacheSizeBeforeClearance = _cacheStats.Size;
long deleteSize = cacheSizeBeforeClearance - desiredSize;
int itemCount = 0;
long sumItemSizes = 0L;
foreach (var entry in entries)
{
if (sumItemSizes > (deleteSize))
{
break;
}
long deletedSize = _storage.Remove(entry);
_resourceIndex.Remove(entry.Id);
if (deletedSize > 0)
{
itemCount++;
sumItemSizes += deletedSize;
SettableCacheEvent cacheEvent = SettableCacheEvent.Obtain()
.SetResourceId(entry.Id)
.SetEvictionReason(reason)
.SetItemSize(deletedSize)
.SetCacheSize(cacheSizeBeforeClearance - sumItemSizes)
.SetCacheLimit(desiredSize);
_cacheEventListener.OnEviction(cacheEvent);
cacheEvent.Recycle();
}
}
_cacheStats.Increment(-sumItemSizes, -itemCount);
_storage.PurgeUnexpectedResources();
}
/// <summary>
/// Obtains the cache event instance.
/// </summary>
public static SettableCacheEvent Obtain()
{
lock (RECYCLER_LOCK)
{
if (_firstRecycledEvent != null)
{
SettableCacheEvent eventToReuse = _firstRecycledEvent;
_firstRecycledEvent = eventToReuse._nextRecycledEvent;
eventToReuse._nextRecycledEvent = null;
_recycledCount--;
return(eventToReuse);
}
}
return(new SettableCacheEvent());
}
/// <summary>
/// Recycles the cache event.
/// </summary>
public void Recycle()
{
lock (RECYCLER_LOCK)
{
if (_recycledCount < MAX_RECYCLED)
{
Reset();
_recycledCount++;
if (_firstRecycledEvent != null)
{
_nextRecycledEvent = _firstRecycledEvent;
}
_firstRecycledEvent = this;
}
}
}
