riversong code showcase

Source/Engine/Core/ServiceLocator.cs

@@ -0,0 +1,53 @@
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+using UnityEngine;
+
+namespace DanieleMarotta.RiversongCodeShowcase
+{
+    public class ServiceLocator : IServiceLocator
+    {
+        private Dictionary<Type, object> _services = new();
+
+        public void RegisterService(Type serviceType, object service)
+        {
+            _services.Add(serviceType, service);
+        }
+
+        public object GetService(Type serviceType)
+        {
+            _services.TryGetValue(serviceType, out var service);
+            return service;
+        }
+
+        public void Inject(object target)
+        {
+            var type = target.GetType();
+
+            while (type != typeof(object))
+            {
+                var bindingAttr = BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance;
+                var fields = type.GetFields(bindingAttr);
+
+                foreach (var field in fields)
+                {
+                    var serviceAttribute = field.GetCustomAttribute<InjectServiceAttribute>();
+                    if (serviceAttribute == null) continue;
+
+                    var serviceType = serviceAttribute.ServiceType ?? field.FieldType;
+
+                    var service = GetService(serviceType);
+                    if (service == null)
+                    {
+                        Debug.LogError($"Could not resolve service of type {serviceType} when injecting {type}");
+                        continue;
+                    }
+
+                    field.SetValue(target, service);
+                }
+
+                type = type.BaseType;
+            }
+        }
+    }
+}