feat: initial commit

Assets/Common/Infrastructure/Runtime/ScriptableObjectSingleton.cs

@@ -0,0 +1,57 @@
+using UnityEngine;
+
+namespace JoeSiu.Common.Infrastructure.Runtime
+{
+    /// <summary>
+    /// <see href="https://youtu.be/6kWUGEQiMUI"/>
+    /// </summary>
+    /// <typeparam name="T"></typeparam>
+    public abstract class ScriptableObjectSingleton<T> : ScriptableObject where T : ScriptableObjectSingleton<T>
+    {
+        private static T _instance;
+        public static T Instance
+        {
+            get
+            {
+                if (_instance != null) return _instance;
+
+                var assets = Resources.LoadAll<T>("");
+
+                if (assets.Length > 0)
+                {
+                    AssignInstance(assets[0]);
+                }
+
+                if (assets.Length > 1)
+                {
+                    Debug.LogError(
+                        $"[ScriptableObjectSingleton] More than 1 instance of Singleton Scriptable Object of type: {typeof(T)} found");
+                }
+
+                if (!_instance)
+                {
+                    Debug.LogWarning(
+                        $"[ScriptableObjectSingleton] No instance of type '{typeof(T).Name}' is found, make sure to add it to the Resources folder!");
+                }
+
+                return _instance;
+            }
+        }
+
+        public static T GetInstance() => _instance;
+
+        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.BeforeSceneLoad)]
+        public static void RemoveInstance()
+        {
+            _instance = null;
+            Debug.Log($"[ScriptableObjectSingleton] Removed instance of type '{typeof(T).Name}'");
+        }
+
+        private static void AssignInstance(T instance)
+        {
+            if (!instance) return;
+            _instance = instance;
+            Debug.Log($"[ScriptableObjectSingleton] Assigned instance of type '{typeof(T).Name}' to object '{instance.name}'", instance);
+        }
+    }
+}