add media metadata cache

zero/Media/MediaMetadataCache.cs

@@ -2,59 +2,10 @@
 
 namespace zero.Media;
 
-public class MediaMetadataCache : IMediaMetadataCache
+public sealed class MediaMetadataCache
 {
-  private const string PREFIX = "zero/media/";
-
-  protected IMemoryCache Cache { get; set; }
-
-
-  public MediaMetadataCache(IMemoryCache cache)
+  public IMemoryCache Cache { get; internal set; } = new MemoryCache(new MemoryCacheOptions
   {
-    Cache = cache;
-  }
-
-
-  /// <inheritdoc />
-  public bool TryGet(string id, out CachedMedia media)
-  {
-    MediaCacheEntry entry = Cache.Get<MediaCacheEntry>(Key(id));
-
-    media = entry != null ? CachedMedia.Create(entry) : null;
-    return entry != null;
-  }
-
-
-  /// <inheritdoc />
-  public void Set(Media media)
-  {
-    MediaCacheEntry entry = MediaCacheEntry.Create(media);
-    Cache.Set(Key(media.Id), entry, new MemoryCacheEntryOptions()
-    {
-      SlidingExpiration = TimeSpan.FromSeconds(60 * 60 * 24)
-    });
-  }
-
-
-  /// <summary>
-  /// Generate cache key from media Id
-  /// </summary>
-  static string Key(string id)
-  {
-    return PREFIX + id;
-  }
+    SizeLimit = 1000
+  });
 }
-
-
-public interface IMediaMetadataCache
-{
-  /// <summary>
-  /// Get a cached and reduced version of a media entity
-  /// </summary>
-  bool TryGet(string id, out CachedMedia media);
-
-  /// <summary>
-  /// Store a media entity in cache
-  /// </summary>
-  void Set(Media media);
-}