performance cache + queued character data application

LightlessSync/PlayerData/Pairs/PairPerformanceMetricsCache.cs

@@ -0,0 +1,65 @@
+using System.Collections.Concurrent;
+
+namespace LightlessSync.PlayerData.Pairs;
+
+public readonly record struct PairPerformanceMetrics(
+    long TriangleCount,
+    long ApproximateVramBytes,
+    long ApproximateEffectiveVramBytes);
+
+/// <summary>
+///     caches performance metrics keyed by pair ident
+/// </summary>
+public sealed class PairPerformanceMetricsCache
+{
+    private sealed record CacheEntry(string DataHash, PairPerformanceMetrics Metrics);
+
+    private readonly ConcurrentDictionary<string, CacheEntry> _cache = new(StringComparer.Ordinal);
+
+    public bool TryGetMetrics(string ident, string dataHash, out PairPerformanceMetrics metrics)
+    {
+        metrics = default;
+        if (string.IsNullOrEmpty(ident) || string.IsNullOrEmpty(dataHash))
+        {
+            return false;
+        }
+
+        if (!_cache.TryGetValue(ident, out var entry))
+        {
+            return false;
+        }
+
+        if (!string.Equals(entry.DataHash, dataHash, StringComparison.Ordinal))
+        {
+            return false;
+        }
+
+        metrics = entry.Metrics;
+        return true;
+    }
+
+    public void StoreMetrics(string ident, string dataHash, PairPerformanceMetrics metrics)
+    {
+        if (string.IsNullOrEmpty(ident) || string.IsNullOrEmpty(dataHash))
+        {
+            return;
+        }
+
+        _cache[ident] = new CacheEntry(dataHash, metrics);
+    }
+
+    public void Clear(string ident)
+    {
+        if (string.IsNullOrEmpty(ident))
+        {
+            return;
+        }
+
+        _cache.TryRemove(ident, out _);
+    }
+
+    public void ClearAll()
+    {
+        _cache.Clear();
+    }
+}