private ImageCacheEntry SetImageToCacheInternal(string key, ImageCacheEntry imageCacheEntry, byte[] imageAsBytes, ImageCacheOptions opts)
{
var entryOptions = new MemoryCacheEntryOptions();
entryOptions.RegisterPostEvictionCallback(_callback);
entryOptions.SetSlidingExpiration(TimeSpan.FromMilliseconds(opts.ExpirationTimeSpanInMilliseconds));
imageCacheEntry.FullPath = opts.PathToCacheDirectory;
var entered = _memoryCache.Set <ImageCacheEntry>(key, imageCacheEntry, entryOptions);
return(this.SaveImageToFolder(entered, imageAsBytes) ? entered : null);
}
public static IApplicationBuilder UseImagesCaching(
this IApplicationBuilder builder, ImageCacheOptions opts)
{
return(builder.UseMiddleware <ImagesCacheMiddleware>(opts));
}
public ImageCacheEntry SetImageToCache(string key, ImageCacheEntry imageCacheEntry, byte[] imageAsBytes, ImageCacheOptions opts)
{
if (imageCacheEntry is null)
{
throw new ArgumentNullException(nameof(imageCacheEntry));
}
if (key is null)
{
throw new ArgumentNullException(nameof(key));
}
return(((MemoryCache)_memoryCache).Count == opts.MaxCountOfCachedImages ? null : this.SetImageToCacheInternal(key, imageCacheEntry, imageAsBytes, opts));
}
public ImagesCacheMiddleware(RequestDelegate next, ImageCacheOptions opts)
{
_next = next;
_opts = opts;
}