Updated audio image extraction logic. Added caching classes.

Harmonia.Core/Caching/MemoryCache.cs

@@ -0,0 +1,43 @@
+using Microsoft.Extensions.Caching.Memory;
+
+namespace Harmonia.Core.Caching;
+
+public abstract class MemoryCache<TKey, TValue> : Cache<TKey, TValue> where TKey : notnull
+{
+    private readonly IMemoryCache _memoryCache;
+
+    protected virtual long? SizeLimit => 2000000000;
+    protected virtual double CompactionPercentage => 0.2;
+    protected virtual TimeSpan SlidingExpiration => TimeSpan.FromSeconds(600);
+
+    public MemoryCache()
+    {
+        MemoryCacheOptions memoryCacheOptions = new()
+        {
+            SizeLimit = SizeLimit,
+            CompactionPercentage = CompactionPercentage
+        };
+
+        _memoryCache = new MemoryCache(memoryCacheOptions);
+    }
+
+    protected override TValue? TryGetValue(object key)
+    {
+        _memoryCache.TryGetValue(key, out TValue? value);
+
+        return value;
+    }
+
+    protected override void AddToCache(object key, TValue entry)
+    {
+        long entrySize = GetEntrySize(entry);
+
+        var cacheEntryOptions = new MemoryCacheEntryOptions()
+            .SetSize(entrySize)
+            .SetSlidingExpiration(SlidingExpiration);
+
+        _memoryCache.Set(key, entry, cacheEntryOptions);
+    }
+
+    protected abstract long GetEntrySize(TValue entry);
+}