public void SetCacheSize(long cacheSize, ImageCacheService.CacheTruncatePriority truncatePriority)
{
if (cacheSize < ImageCacheService.MinCacheSize)
{
throw new ArgumentException($"Cache size can not be lower then {GeneralConverters.FileSizeToStringFormater.ConvertFileSizeToString(ImageCacheService.MinCacheSize, 0)}");
}
if (cacheSize > ImageCacheService.MaxCacheSize)
{
throw new ArgumentException($"Cache size can not be higher then {GeneralConverters.FileSizeToStringFormater.ConvertFileSizeToString(ImageCacheService.MaxCacheSize, 0)}");
}
if (cacheSize < CacheSize)
{
TruncateCache(truncatePriority);
}
_cacheSize = cacheSize;
_maxCacheSize = cacheSize;
}
private void TruncateCache(ImageCacheService.CacheTruncatePriority truncatePriority)
{
_cacheSizeIsValid = false;
long truncatedSize = Convert.ToInt64((double)_maxCacheSize * 0.75d);
if (truncatePriority == ImageCacheService.CacheTruncatePriority.RemoveOldest)
{
while (_cachedImages.Count > 0 && CacheSize > truncatedSize)
{
string oldestImageFilename = _cachedImages.Values.OrderByDescending(x => x.AddedToCacheTime).First().Filename;
_cachedImages.Remove(oldestImageFilename);
_cacheSizeIsValid = false;
}
}
else
{
while (_cachedImages.Count > 0 && CacheSize > truncatedSize)
{
string oldestImageFilename = _cachedImages.Values.OrderByDescending(x => x.Size).First().Filename;
_cachedImages.Remove(oldestImageFilename);
_cacheSizeIsValid = false;
}
}
}
