private async Task <IFileInfo> GetImageFromStorageAsync(IImageStorage imageStorage, DateTime requestTime)
{
IFileInfo fileInfo = null;
KeyValuePair <string, DateTime> cacheItem;
fileInfo = imageStorage.GetImageDirectly();
if (fileInfo == null || !fileInfo.Exists)
{
fileInfo = await imageStorage.GetImageVariantAsync();
}
if (fileInfo != null && fileInfo.Exists)
{
if (!imageChache.TryGetValue(imageStorage.ImagePath, out cacheItem))
{
cacheItem = new KeyValuePair <string, DateTime>(fileInfo.PhysicalPath, requestTime);
if (imageChache.TryAdd(imageStorage.ImagePath, cacheItem))
{
logger.LogInformation(
MainCfg.LogEventId,
"Path '{0}' was succesfully aedded to image cache.",
imageStorage.ImagePath);
if (imageChache.Count > MainCfg.MaxImagesMiddlewareCachedRequests)
{
KeyValuePair <string, KeyValuePair <string, DateTime> >?lastCachedItem = imageChache.OrderBy(c => c.Value.Value).LastOrDefault();
if (lastCachedItem.HasValue)
{
KeyValuePair <string, DateTime> removedCachedValue;
if (imageChache.TryRemove(lastCachedItem.Value.Key, out removedCachedValue))
{
logger.LogTrace(
MainCfg.LogEventId,
"Path '{0}' was removed from the image cache due to the maximum value of the cahce items has been exceeded!",
imageStorage.ImagePath);
}
else
{
logger.LogInformation(
MainCfg.LogEventId,
"Couldn't remove the path '{0}' from the image cache due the maximum value of the cahce items has been exceeded!",
imageStorage.ImagePath);
}
}
}
}
else
{
logger.LogInformation(MainCfg.LogEventId, "Couldn't add the path '{0}' to image cache.", imageStorage.ImagePath);
}
}
}
return(fileInfo);
}
