[feat] 주문 결제 서비스

주문 금액만큼 사용자의 계좌에서 차감하는 서비스

src/main/java/camp/woowak/lab/order/domain/Order.java

@@ -35,14 +35,16 @@ public class Order {
 	@ElementCollection(fetch = FetchType.EAGER)
 	private List<OrderItem> orderItems = new ArrayList<>();
 
-	public Order(Customer requester, Store store, List<CartItem> cartItems, SingleStoreOrderValidator validator,
-				 StockRequester stockRequester, PriceChecker priceChecker) {
-		validator.check(store, cartItems);
+	public Order(Customer requester, Store store, List<CartItem> cartItems,
+				 SingleStoreOrderValidator singleStoreOrderValidator,
+				 StockRequester stockRequester, PriceChecker priceChecker, WithdrawPointService withdrawPointService) {
+		singleStoreOrderValidator.check(store, cartItems);
 		stockRequester.request(cartItems);
-		List<OrderItem> orderItem = priceChecker.check(cartItems);
+		List<OrderItem> orderItems = priceChecker.check(cartItems);
+		withdrawPointService.withdraw(requester, orderItems);
 		this.requester = requester;
 		this.store = store;
-		this.orderItems = orderItem;
+		this.orderItems = orderItems;
 	}
 
 	public Long getId() {

src/main/java/camp/woowak/lab/order/domain/WithdrawPointService.java

@@ -0,0 +1,35 @@
+package camp.woowak.lab.order.domain;
+
+import java.util.List;
+import java.util.Optional;
+
+import org.springframework.stereotype.Component;
+
+import camp.woowak.lab.customer.domain.Customer;
+import camp.woowak.lab.order.domain.vo.OrderItem;
+import camp.woowak.lab.payaccount.domain.PayAccount;
+import camp.woowak.lab.payaccount.exception.NotFoundAccountException;
+import camp.woowak.lab.payaccount.repository.PayAccountRepository;
+
+@Component
+public class WithdrawPointService {
+	private final PayAccountRepository payAccountRepository;
+
+	public WithdrawPointService(PayAccountRepository payAccountRepository) {
+		this.payAccountRepository = payAccountRepository;
+	}
+
+	public List<OrderItem> withdraw(Customer customer, List<OrderItem> orderItems) {
+		Optional<PayAccount> findPayAccount = payAccountRepository.findByCustomerIdForUpdate(customer.getId());
+		if (findPayAccount.isEmpty()) {
+			throw new NotFoundAccountException("주문을 처리할 계좌가 생성되지 않았습니다.");
+		}
+		PayAccount payAccount = findPayAccount.get();
+		int totalPrice = 0;
+		for (OrderItem orderItem : orderItems) {
+			totalPrice += orderItem.getTotalPrice();
+		}
+		payAccount.withdraw(totalPrice);
+		return orderItems;
+	}
+}

src/main/java/camp/woowak/lab/order/service/OrderCreationService.java

@@ -13,8 +13,10 @@
 import camp.woowak.lab.customer.domain.Customer;
 import camp.woowak.lab.customer.repository.CustomerRepository;
 import camp.woowak.lab.order.domain.Order;
+import camp.woowak.lab.order.domain.PriceChecker;
 import camp.woowak.lab.order.domain.SingleStoreOrderValidator;
 import camp.woowak.lab.order.domain.StockRequester;
+import camp.woowak.lab.order.domain.WithdrawPointService;
 import camp.woowak.lab.order.exception.EmptyCartException;
 import camp.woowak.lab.order.repository.OrderRepository;
 import camp.woowak.lab.order.service.command.OrderCreationCommand;
@@ -31,16 +33,21 @@ public class OrderCreationService {
 	private final CustomerRepository customerRepository;
 	private final SingleStoreOrderValidator singleStoreOrderValidator;
 	private final StockRequester stockRequester;
+	private final WithdrawPointService withdrawPointService;
+	private final PriceChecker priceChecker;
 
 	public OrderCreationService(OrderRepository orderRepository, CartRepository cartRepository,
 								StoreRepository storeRepository, CustomerRepository customerRepository,
-								SingleStoreOrderValidator singleStoreOrderValidator, StockRequester stockRequester) {
+								SingleStoreOrderValidator singleStoreOrderValidator, StockRequester stockRequester,
+								WithdrawPointService withdrawPointService, PriceChecker priceChecker) {
 		this.orderRepository = orderRepository;
 		this.cartRepository = cartRepository;
 		this.storeRepository = storeRepository;
 		this.customerRepository = customerRepository;
 		this.singleStoreOrderValidator = singleStoreOrderValidator;
 		this.stockRequester = stockRequester;
+		this.withdrawPointService = withdrawPointService;
+		this.priceChecker = priceChecker;
 	}
 
 	public Long create(OrderCreationCommand cmd) {
@@ -56,7 +63,8 @@ public Long create(OrderCreationCommand cmd) {
 			throw new NotFoundStoreException("등록되지 않은 가게의 상품을 주문했습니다.");
 		}
 		Order savedOrder = orderRepository.save(
-			new Order(requester, findStore.get(), cartItems, singleStoreOrderValidator, stockRequester));
+			new Order(requester, findStore.get(), cartItems, singleStoreOrderValidator, stockRequester, priceChecker,
+				withdrawPointService));
 		return savedOrder.getId();
 	}
 }