feature: 결제 도메인 및 관련 컴포넌트 추가 (Payment 엔티티, 서비스, 리포지토리 등)

Author: yeonjiyeon

apps/commerce-api/src/main/java/com/loopers/domain/payment/Payment.java

@@ -0,0 +1,80 @@
+package com.loopers.domain.payment;
+
+import com.loopers.domain.BaseEntity;
+import com.loopers.domain.money.Money;
+import com.loopers.support.error.CoreException;
+import com.loopers.support.error.ErrorType;
+import jakarta.persistence.AttributeOverride;
+import jakarta.persistence.Column;
+import jakarta.persistence.Embedded;
+import jakarta.persistence.Entity;
+import jakarta.persistence.EnumType;
+import jakarta.persistence.Enumerated;
+import jakarta.persistence.Table;
+import java.util.UUID;
+import lombok.AccessLevel;
+import lombok.NoArgsConstructor;
+import org.springframework.util.StringUtils;
+
+@Entity
+@Table(name = "payment")
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+public class Payment extends BaseEntity {
+
+  @Column(name = "ref_user_id", nullable = false)
+  private Long userId;
+
+  @Column(name = "ref_order_id", nullable = false)
+  private Long orderId;
+
+  @Column(name = "transaction_id", nullable = false, unique = true)
+  private String transactionId;//멱등키
+
+  @Column(name = "card_type", nullable = false)
+  private String cardType;
+
+  @Column(name = "card_no", nullable = false)
+  private String cardNo;
+
+  @Embedded
+  @AttributeOverride(name = "value", column = @Column(name = "amount"))
+  private Money amount;
+
+  @Enumerated(EnumType.STRING)
+  @Column(nullable = false)
+  private PaymentStatus status;
+
+  @Column(name = "pg_txn_id")
+  private String pgTxnId;
+
+  public Payment(Long orderId, Long userId, Money amount, String cardType, String cardNo) {
+    validateConstructor(orderId, userId, amount, cardType, cardNo);
+
+    this.orderId = orderId;
+    this.userId = userId;
+    this.amount = amount;
+    this.cardType = cardType;
+    this.cardNo = cardNo;
+    this.status = PaymentStatus.READY;
+
+    this.transactionId = UUID.randomUUID().toString();
+  }
+
+  private void validateConstructor(Long orderId, Long userId, Money amount, String cardType, String cardNo) {
+    if (orderId == null) {
+      throw new CoreException(ErrorType.BAD_REQUEST, "주문 정보는 필수입니다.");
+    }
+    if (userId == null) {
+      throw new CoreException(ErrorType.BAD_REQUEST, "사용자 정보는 필수입니다.");
+    }
+    if (amount == null) {
+      throw new CoreException(ErrorType.BAD_REQUEST, "결제 금액은 필수입니다.");
+    }
+    if (!StringUtils.hasText(cardType)) {
+      throw new CoreException(ErrorType.BAD_REQUEST, "카드 종류는 필수입니다.");
+    }
+    if (!StringUtils.hasText(cardNo)) {
+      throw new CoreException(ErrorType.BAD_REQUEST, "카드 번호는 필수입니다.");
+    }
+  }
+}

apps/commerce-api/src/main/java/com/loopers/domain/payment/PaymentRepository.java

@@ -0,0 +1,6 @@
+package com.loopers.domain.payment;
+
+public interface PaymentRepository {
+
+  Payment save(Payment payment);
+}

apps/commerce-api/src/main/java/com/loopers/domain/payment/PaymentService.java

@@ -0,0 +1,27 @@
+package com.loopers.domain.payment;
+
+import com.loopers.domain.order.Order;
+import com.loopers.domain.user.User;
+import jakarta.transaction.Transactional;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Component;
+
+@RequiredArgsConstructor
+@Component
+public class PaymentService {
+
+  private final PaymentRepository paymentRepository;
+
+  @Transactional
+  public Payment createPendingPayment(User user, Order order, String cardType, String cardNo) {
+    Payment payment = new Payment(
+        order.getId(),
+        user.getId(),
+        order.getTotalAmount(),
+        cardType,
+        cardNo
+    );
+
+    return paymentRepository.save(payment);
+  }
+}

apps/commerce-api/src/main/java/com/loopers/domain/payment/PaymentStatus.java

@@ -0,0 +1,8 @@
+package com.loopers.domain.payment;
+
+public enum PaymentStatus {
+  READY,
+  PAID,
+  CANCELLED,
+  FAILED
+}

apps/commerce-api/src/main/java/com/loopers/infrastructure/payment/PaymentJpaRepository.java

@@ -0,0 +1,8 @@
+package com.loopers.infrastructure.payment;
+
+import com.loopers.domain.payment.Payment;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface PaymentJpaRepository extends JpaRepository<Payment, Long> {
+
+}

apps/commerce-api/src/main/java/com/loopers/infrastructure/payment/PaymentRepositoryImpl.java

@@ -0,0 +1,18 @@
+package com.loopers.infrastructure.payment;
+
+import com.loopers.domain.payment.Payment;
+import com.loopers.domain.payment.PaymentRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Component;
+
+@RequiredArgsConstructor
+@Component
+public class PaymentRepositoryImpl implements PaymentRepository {
+
+  private final PaymentJpaRepository paymentJpaRepository;
+
+  @Override
+  public Payment save(Payment payment) {
+    return paymentJpaRepository.save(payment);
+  }
+}