Ddd/step4

orders.http

@@ -1,10 +1,55 @@
-### 주문 생성
+###############################################
+# 도메인 간 소통 비교 — Facade vs API 호출
+# (자세한 설명: DOMAIN_COMMUNICATION.md)
+#
+# 세 요청의 입력/결과는 동일하다. 다른 것은 "주문이 어떻게 소통했는가" 뿐.
+###############################################
+
+### 0) 비교 전 상품 재고 확인
+GET http://localhost:8080/products/1
+
+### 베이스라인 — OrderService: 다른 도메인 Service 빈을 직접 호출
 POST http://localhost:8080/orders
 Content-Type: application/json
 
 {
-  "userId": 1
+  "userId": 1,
+  "requests": [ { "productId": 1, "quantity": 1 } ]
 }
 
-### 전체 주문 목록 조회
+### 방식 1) Facade — in-process 직접 호출 + 단일 트랜잭션(강한 일관성)
+POST http://localhost:8080/orders/facade
+Content-Type: application/json
+
+{
+  "userId": 1,
+  "requests": [ { "productId": 1, "quantity": 1 } ]
+}
+
+### 방식 2) API 호출 — RestClient 로 상품/결제를 HTTP 호출(경계·트랜잭션 분리)
+POST http://localhost:8080/orders/api
+Content-Type: application/json
+
+{
+  "userId": 1,
+  "requests": [ { "productId": 1, "quantity": 1 } ]
+}
+
+### 비교 후 재고 확인 (세 번 주문했으니 3 감소)
+GET http://localhost:8080/products/1
+
+### 주문 목록
 GET http://localhost:8080/orders
+
+###############################################
+# 방식 2 가 내부에서 호출하는 "공개된 도메인 API" (직접 찔러보기)
+###############################################
+
+### 상품 재고 차감 API (주문 → 상품)
+POST http://localhost:8080/products/1/decrease-stock?quantity=1
+
+### 상품 재고 복원 API (보상 트랜잭션 예시)
+POST http://localhost:8080/products/1/restore-stock?quantity=1
+
+### 결제 승인 API (주문 → 결제)
+POST http://localhost:8080/payments?amount=179000

src/main/java/com/growmighty/lectures/firstday/tangledmonolith/DataInitializer.java

@@ -1,50 +1,60 @@
 package com.growmighty.lectures.firstday.tangledmonolith;
 
-import com.growmighty.lectures.firstday.tangledmonolith.cart.Cart;
-import com.growmighty.lectures.firstday.tangledmonolith.cart.CartItem;
-import com.growmighty.lectures.firstday.tangledmonolith.cart.CartRepository;
-import com.growmighty.lectures.firstday.tangledmonolith.product.Product;
-import com.growmighty.lectures.firstday.tangledmonolith.product.ProductRepository;
-import com.growmighty.lectures.firstday.tangledmonolith.seller.Seller;
-import com.growmighty.lectures.firstday.tangledmonolith.seller.SellerRepository;
-import com.growmighty.lectures.firstday.tangledmonolith.user.User;
-import com.growmighty.lectures.firstday.tangledmonolith.user.UserRepository;
+import com.growmighty.lectures.firstday.tangledmonolith.cart.application.CartService;
+import com.growmighty.lectures.firstday.tangledmonolith.cart.application.dto.AddCartItemCommand;
+import com.growmighty.lectures.firstday.tangledmonolith.cart.domain.Cart;
+import com.growmighty.lectures.firstday.tangledmonolith.cart.domain.CartItem;
+import com.growmighty.lectures.firstday.tangledmonolith.cart.domain.CartRepository;
+import com.growmighty.lectures.firstday.tangledmonolith.product.application.ProductService;
+import com.growmighty.lectures.firstday.tangledmonolith.product.application.dto.ProductInfo;
+import com.growmighty.lectures.firstday.tangledmonolith.product.application.dto.RegisterProductCommand;
+import com.growmighty.lectures.firstday.tangledmonolith.product.domain.Product;
+import com.growmighty.lectures.firstday.tangledmonolith.product.domain.ProductRepository;
+import com.growmighty.lectures.firstday.tangledmonolith.seller.application.SellerService;
+import com.growmighty.lectures.firstday.tangledmonolith.seller.application.dto.ApplySellerCommand;
+import com.growmighty.lectures.firstday.tangledmonolith.seller.application.dto.SellerInfo;
+import com.growmighty.lectures.firstday.tangledmonolith.seller.domain.Seller;
+import com.growmighty.lectures.firstday.tangledmonolith.seller.domain.SellerRepository;
+import com.growmighty.lectures.firstday.tangledmonolith.user.application.UserService;
+import com.growmighty.lectures.firstday.tangledmonolith.user.application.dto.RegisterUserCommand;
+import com.growmighty.lectures.firstday.tangledmonolith.user.application.dto.UserInfo;
+import com.growmighty.lectures.firstday.tangledmonolith.user.domain.User;
+import com.growmighty.lectures.firstday.tangledmonolith.user.domain.UserRepository;
 import lombok.RequiredArgsConstructor;
 import org.springframework.boot.CommandLineRunner;
+import org.springframework.context.annotation.Profile;
 import org.springframework.stereotype.Component;
 
 import java.math.BigDecimal;
 
 @Component
+@Profile("!test")
 @RequiredArgsConstructor
 public class DataInitializer implements CommandLineRunner {
-
-    private final UserRepository userRepository;
-    private final SellerRepository sellerRepository;
-    private final ProductRepository productRepository;
-    private final CartRepository cartRepository;
+    private final UserService userService;
+    private final SellerService sellerService;
+    private final ProductService productService;
+    private final CartService cartService;
 
     @Override
     public void run(String... args) {
-        User buyer = userRepository.save(
-                User.register("buyer@growmighty.co.kr", "encoded-pw", "구매자", "010-1111-1111"));
-        User sellerOwner = userRepository.save(
-                User.register("seller@growmighty.co.kr", "encoded-pw", "판매자", "010-2222-2222"));
+        UserInfo buyer = userService.register(
+                new RegisterUserCommand("buyer@growmighty.co.kr", "rawPassword1!", "구매자", "010-1111-1111"));
+        UserInfo sellerOwner = userService.register(
+                new RegisterUserCommand("seller@growmighty.co.kr", "rawPassword2!", "판매자", "010-2222-2222"));
 
-        Seller seller = sellerRepository.save(Seller.create(sellerOwner));
+        SellerInfo seller = sellerService.apply(new ApplySellerCommand(sellerOwner.id(), "그로마이티 가구"));
 
-        Product chair = productRepository.save(
-                Product.create(seller, "Dofia 이동식 접이식 식탁 의자 4개 세트", BigDecimal.valueOf(179000), 10, "가정용 소형주택 신축식"));
-        Product table = productRepository.save(
-                Product.create(seller, "원목 4인용 식탁", BigDecimal.valueOf(259000), 5, "북유럽 스타일 원목 식탁"));
+        ProductInfo chair = productService.register(new RegisterProductCommand(
+                seller.id(), "Dofia 이동식 접이식 식탁 의자 4개 세트", BigDecimal.valueOf(179000), 10, "가정용 소형주택 신축식"));
+        ProductInfo table = productService.register(new RegisterProductCommand(
+                seller.id(), "원목 4인용 식탁", BigDecimal.valueOf(259000), 5, "북유럽 스타일 원목 식탁"));
 
-        Cart cart = Cart.create(buyer);
-        cart.addItem(CartItem.create(chair, 2));
-        cart.addItem(CartItem.create(table, 1));
-        cartRepository.save(cart);
+        cartService.addItem(new AddCartItemCommand(buyer.id(), chair.id(), 2));
+        cartService.addItem(new AddCartItemCommand(buyer.id(), table.id(), 1));
 
         System.out.printf(
-                "[seed] 구매자 id=%d, 장바구니 id=%d 준비 완료. 예) POST /orders?userId=%d%n",
-                buyer.getId(), cart.getId(), buyer.getId());
+                "[seed] 구매자 id=%d 준비 완료. 예) POST /orders/from-cart?userId=%d 또는 POST /orders%n",
+                buyer.id(), buyer.id());
     }
 }

src/main/java/com/growmighty/lectures/firstday/tangledmonolith/cart/application/CartService.java

@@ -0,0 +1,61 @@
+package com.growmighty.lectures.firstday.tangledmonolith.cart.application;
+
+import com.growmighty.lectures.firstday.tangledmonolith.cart.domain.Cart;
+import com.growmighty.lectures.firstday.tangledmonolith.cart.domain.CartRepository;
+import com.growmighty.lectures.firstday.tangledmonolith.cart.application.dto.AddCartItemCommand;
+import com.growmighty.lectures.firstday.tangledmonolith.cart.application.dto.CartView;
+import com.growmighty.lectures.firstday.tangledmonolith.common.exception.EntityNotFoundException;
+import com.growmighty.lectures.firstday.tangledmonolith.product.application.ProductService;
+import com.growmighty.lectures.firstday.tangledmonolith.product.application.dto.ProductInfo;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+@Service
+@RequiredArgsConstructor
+public class CartService {
+    private final CartRepository cartRepository;
+    private final ProductService productService;
+
+    @Transactional
+    public CartView addItem(AddCartItemCommand command) {
+        ProductInfo product = productService.getProductInfo(command.productId());
+        if (!product.isOrderable()) {
+            throw new IllegalStateException("현재 구매할 수 없는 상품입니다. productId = " + command.productId());
+        }
+        Cart cart = cartRepository.findByUserId(command.userId())
+                .orElseGet(() -> Cart.create(command.userId()));
+        cart.addItem(command.productId(), command.quantity());
+        return CartView.from(cartRepository.save(cart));
+    }
+
+    @Transactional
+    public CartView changeQuantity(Long userId, Long productId, int quantity) {
+        Cart cart = getCartEntity(userId);
+        cart.changeQuantity(productId, quantity);
+        return CartView.from(cart);
+    }
+
+    @Transactional
+    public CartView removeItem(Long userId, Long productId) {
+        Cart cart = getCartEntity(userId);
+        cart.removeItem(productId);
+        return CartView.from(cart);
+    }
+
+    @Transactional
+    public void clear(Long userId) {
+        getCartEntity(userId).clear();
+    }
+
+    @Transactional(readOnly = true)
+    public CartView getCart(Long userId) {
+        return CartView.from(getCartEntity(userId));
+    }
+
+    private Cart getCartEntity(Long userId) {
+        return cartRepository.findByUserId(userId)
+                .orElseThrow(() -> new EntityNotFoundException("장바구니가 비어 있습니다. userId=" + userId));
+    }
+}

src/main/java/com/growmighty/lectures/firstday/tangledmonolith/cart/application/dto/AddCartItemCommand.java

@@ -0,0 +1,4 @@
+package com.growmighty.lectures.firstday.tangledmonolith.cart.application.dto;
+
+public record AddCartItemCommand(Long userId, Long productId, int quantity) {
+}

src/main/java/com/growmighty/lectures/firstday/tangledmonolith/cart/application/dto/CartView.java

@@ -0,0 +1,17 @@
+package com.growmighty.lectures.firstday.tangledmonolith.cart.application.dto;
+
+import com.growmighty.lectures.firstday.tangledmonolith.cart.domain.Cart;
+
+import java.util.List;
+
+public record CartView (Long cartId, Long userId, List<Line> items) {
+    public record Line(Long productId, int quantity) {
+    }
+
+    public static CartView from(Cart cart) {
+        List<Line> lines = cart.getItems().stream()
+                .map(item -> new Line(item.getProductId(), item.getQuantity()))
+                .toList();
+        return new CartView(cart.getId(), cart.getUserId(), lines);
+    }
+}