harmonia/Harmonia.Core/Caching/AudioImageMemoryCache.cs

using Harmonia.Core.Imaging;
using Harmonia.Core.Models;

namespace Harmonia.Core.Caching;

public class AudioImageMemoryCache(IAudioImageExtractor audioImageExtractor) : MemoryCache<Song, SongPictureInfo>, IAudioImageCache
{
    protected override long? SizeLimit => 2000000000;
    protected override double CompactionPercentage => 0.2;
    protected override TimeSpan SlidingExpiration => TimeSpan.FromSeconds(600);

    protected override object? GetKey(Song key)
    {
        if (string.IsNullOrWhiteSpace(key.ImageHash) == false)
        {
            return key.ImageHash;
        }
        else if (string.IsNullOrWhiteSpace(key.ImageName) == false)
        {
            return key.ImageName;
        }

        return null;
    }

    protected override SongPictureInfo? Fetch(Song key)
    {
        return audioImageExtractor.ExtractImage(key.FileName);
    }

    protected override void AddToCache(object key, SongPictureInfo entry)
    {
        base.AddToCache(key, entry);
    }

    protected override long GetEntrySize(SongPictureInfo entry)
    {
        return entry.Size;
    }
}