[230319] 결제완료 command 개발

- 각 폴더 구조 생성
- 도메인 Event 구조 생성
- kafka message sender 테스트까지 확인
- 결제 완료 예시 application service

payment-command/src/main/java/com/example/user/domain/Cash.java

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+package com.example.user.domain;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import java.math.BigDecimal;
+import java.time.LocalDateTime;
+import java.util.UUID;
+import lombok.AccessLevel;
+import lombok.AllArgsConstructor;
+import lombok.NoArgsConstructor;
+import org.springframework.data.annotation.CreatedDate;
+import org.springframework.data.annotation.LastModifiedDate;
+
+@Entity
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@AllArgsConstructor(access = AccessLevel.PRIVATE)
+public class Cash {
+
+    @Id
+    private String id;
+
+    private BigDecimal amount;
+
+    @ManyToOne
+    @JoinColumn
+    private User user;
+
+    @CreatedDate
+    private LocalDateTime createdAt;
+
+    @LastModifiedDate
+    private LocalDateTime updatedAt;
+
+    public String getId() {
+        return id;
+    }
+
+    public static Cash of(BigDecimal amount, User user) {
+        return new Cash(UUID.fromString("cash").toString(), amount, user, null, null);
+    }
+}

payment-command/src/main/java/com/example/user/domain/User.java

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+package com.example.user.domain;
+
+import jakarta.persistence.CascadeType;
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.OneToMany;
+import java.math.BigDecimal;
+import java.time.LocalDateTime;
+import java.util.ArrayList;
+import java.util.List;
+import org.springframework.data.annotation.CreatedDate;
+import org.springframework.data.annotation.LastModifiedDate;
+
+@Entity
+public class User {
+
+    @Id
+    private String userId;
+
+    private BigDecimal balance;
+
+    @OneToMany(mappedBy = "user", cascade = CascadeType.ALL)
+    private List<Cash> cashes = new ArrayList<>();
+
+    @CreatedDate
+    private LocalDateTime createdAt;
+
+    @LastModifiedDate
+    private LocalDateTime updatedAt;
+
+    public String getUserId() {
+        return userId;
+    }
+
+    public void increaseBalance(BigDecimal amount) {
+        balance = balance.add(amount);
+    }
+
+    public String addNewCash(Cash cash) {
+        this.cashes.add(cash);
+        return cash.getId();
+    }
+}

payment-command/src/main/java/com/example/user/domain/UserRepository.java

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+package com.example.user.domain;
+
+public interface UserRepository {
+
+    User getByIdOrDefault(String id);
+
+    String save(User user);
+}

payment-command/src/main/java/com/example/user/infra/persistence/UserJpaRepositroy.java

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+package com.example.user.infra.persistence;
+
+import com.example.user.domain.User;
+import org.springframework.data.repository.CrudRepository;
+
+public interface UserJpaRepositroy extends CrudRepository<User, String> {
+}

payment-command/src/main/java/com/example/user/infra/persistence/UserRepositoryImpl.java

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+package com.example.user.infra.persistence;
+
+import com.example.user.domain.User;
+import com.example.user.domain.UserRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Repository;
+
+@Repository
+@RequiredArgsConstructor
+public class UserRepositoryImpl implements UserRepository {
+
+    private final UserJpaRepositroy jpaRepository;
+
+    @Override
+    public String save(User user) {
+        return jpaRepository.save(user).getUserId();
+    }
+
+    @Override
+    public User getByIdOrDefault(String id) {
+
+        return null;
+    }
+}