新增 FlowScope Git 包雏形

Packages/com.flowscope.gamecore/Runtime/Resources/ResourceEntry.cs

@@ -0,0 +1,74 @@
+using System;
+
+namespace FlowScope.Resources
+{
+    internal sealed class ResourceEntry
+    {
+        private readonly Action<string, Type, object> _release;
+        private int _referenceCount;
+        private bool _released;
+
+        public ResourceEntry(string key, object asset, Action<string, object> release)
+            : this(key, asset?.GetType(), asset, (_, _, releasedAsset) => release(key, releasedAsset))
+        {
+        }
+
+        public ResourceEntry(string key, Type assetType, object asset, Action<string, Type, object> release)
+        {
+            Key = string.IsNullOrWhiteSpace(key)
+                ? throw new ArgumentException("Resource key is required.", nameof(key))
+                : key;
+            AssetType = assetType ?? throw new ArgumentNullException(nameof(assetType));
+            Asset = asset ?? throw new ArgumentNullException(nameof(asset));
+            _release = release ?? throw new ArgumentNullException(nameof(release));
+        }
+
+        public string Key { get; }
+        public Type AssetType { get; }
+        public object Asset { get; private set; }
+        public int ReferenceCount => _referenceCount;
+
+        public ResourceHandle<T> CreateHandle<T>() where T : class
+        {
+            if (_released)
+            {
+                throw new ObjectDisposedException(nameof(ResourceEntry));
+            }
+
+            _referenceCount++;
+            return new ResourceHandle<T>(this);
+        }
+
+        public void ReleaseHandle()
+        {
+            if (_released)
+            {
+                return;
+            }
+
+            _referenceCount--;
+            if (_referenceCount > 0)
+            {
+                return;
+            }
+
+            _released = true;
+            var asset = Asset;
+            Asset = null;
+            _release(Key, AssetType, asset);
+        }
+
+        public void ReleaseWithoutHandle()
+        {
+            if (_released)
+            {
+                return;
+            }
+
+            _released = true;
+            var asset = Asset;
+            Asset = null;
+            _release(Key, AssetType, asset);
+        }
+    }
+}