infrastructure DI

dotnet/AipsCore/Infrastructure/DI/HandlerRegistrationExtensions.cs

@@ -0,0 +1,42 @@
+using System.Reflection;
+using AipsCore.Application.Abstract.Command;
+using AipsCore.Application.Abstract.Query;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace AipsCore.Infrastructure.DI;
+
+public static class HandlerRegistrationExtensions
+{
+    public static IServiceCollection AddHandlersFromAssembly(this IServiceCollection services, Assembly assembly)
+    {
+        var handlerInterfaces = new[]
+        {
+            typeof(ICommandHandler<>),
+            typeof(ICommandHandler<,>),
+            typeof(IQueryHandler<,>)
+        };
+
+        var types = assembly.GetTypes()
+            .Where(t => t is { IsAbstract: false, IsInterface: false });
+
+        foreach (var type in types)
+        {
+            var interfaces = type.GetInterfaces();
+
+            foreach (var @interface in interfaces)
+            {
+                if (!@interface.IsGenericType)
+                    continue;
+
+                var genericDef = @interface.GetGenericTypeDefinition();
+
+                if (!handlerInterfaces.Contains(genericDef))
+                    continue;
+                
+                services.AddScoped(@interface, type);
+            }
+        }
+
+        return services;
+    }
+}