[NL-13] : DIInjector 구현 (#11)

* [NL-13] : DIInjector 구현
- Property Wrapper 이용해서 Injected 될 수 있도록 구현

* [NL-13] : - refactor
- register시 object 등록하지 않고 클로저를 받도록 수정
- 인스턴스 생성 시점 register -> resolve

Author: GomHyeok

Core/DIInjector/Sources/DependencyInjector.swift

@@ -0,0 +1,53 @@
+//
+//  DependencyInjector.swift
+//  CoreLayer
+//
+//  Created by 최재혁 on 7/21/25.
+//
+
+import Foundation
+import Swinject
+
+@propertyWrapper
+public final class Injected<T> {
+    public let wrappedValue : T
+    
+    public init() {
+        self.wrappedValue = DependencyInjector.shared.resolve(T.self)
+    }
+}
+
+// DI 대상 등록
+public protocol DependencyAssemblable {
+    func assemble(_ assemblyList: [Assembly])
+    func register<T>(_ serviceType : T.Type, factory: @escaping (Resolver) -> T)
+}
+
+// DI 등록한 서비스 사용
+public protocol DependencyResolvable {
+    func resolve<T>(_ serviceType : T.Type) -> T
+}
+
+public typealias Injector = DependencyAssemblable & DependencyResolvable
+
+public final class DependencyInjector : Injector {
+    private let container : Container = Container()
+    
+    public static let shared = DependencyInjector()
+    
+    private init() { }
+    
+    public func assemble(_ assemblyList: [any Assembly]) {
+        assemblyList.forEach {
+            $0.assemble(container: container)
+        }
+    }
+    
+    public func register<T>(_ serviceType: T.Type, factory : @escaping (Resolver) -> T) {
+        container.register(serviceType, factory: factory)
+    }
+    
+    public func resolve<T>(_ serviceType: T.Type) -> T {
+        container.resolve(serviceType)!
+    }
+}

Core/DIInjector/Sources/empty.swift

@@ -0,0 +1,23 @@
+//
+//  DependencyInjectorTest.swift
+//  DITest
+//
+//  Created by 최재혁 on 7/21/25.
+//
+
+import Testing
+import Swinject
+import DIInjector
+
+struct DependencyInjectorTest {
+    
+    init() async throws {
+        DependencyInjector.shared.assemble([
+        MockAssembly()
+    ])}
+    
+    @Test func dependencyTest() {
+        @Injected var mockClass : MockClass
+        #expect(mockClass.mockFunc())
+    }
+}

Core/DIInjector/Test/Sources/DependencyInjectorTest.swift

@@ -0,0 +1,23 @@
+//
+//  MockData.swift
+//  CoreLayer
+//
+//  Created by 최재혁 on 7/21/25.
+//
+
+import Swinject
+
+public class MockClass {
+    func mockFunc() -> Bool {
+        print("MockClass Registered")
+        return true
+    }
+}
+
+public struct MockAssembly : Assembly {
+    public func assemble(container: Container) {
+        container.register(MockClass.self) { _ in
+            return MockClass()
+        }
+    }
+}

Core/DIInjector/Test/Sources/MockData.swift

@@ -26,6 +26,15 @@ struct CoreLayer: Layer {
         dependencies: [
           .external(name: "Swinject")
         ]
+      ),
+      .createTarget(
+        name: "DITest",
+        product: .unitTests,
+        sources: ["DIInjector/Test/Sources/**"],
+        dependencies: [
+          .target(name: "DIInjector"),
+          
+        ]
       )
     ]
   }