<aside> <img src="https://raw.githubusercontent.com/eirikmadland/notion-icons/master/v5/icon3/ul-github.svg" alt="https://raw.githubusercontent.com/eirikmadland/notion-icons/master/v5/icon3/ul-github.svg" width="40px" /> 참조 Github Code

</aside>

1. Data Validation

[Validation 수행하면서 데이터 바인드 하는 DTO 작성 ]

public class CreateDeveloper {

    @Getter
    @Setter
    @AllArgsConstructor
    @NoArgsConstructor
    @Builder
    @ToString
    public static class Request{
        @NotNull    // 빈값 허용 X
        private DeveloperLevel developerLevel;

        @NotNull
        private DeveloperSkillType developerSkillType;

        @NotNull
        @Min(0)     // 최소 0
        @Max(20)    // 최대 20
        private Integer experienceYears;

        @NotNull
        @Size(min = 3, max = 50, message = "memberId size must 3~50")
        // 데이터 크기 정의 : 최소 3, 최대 50, Error 메시지 작성
        private String memberId;

        @NotNull
        @Size(min = 3, max = 20, message = "name size must 3~20")
        private String name;

        @Min(18)
        private Integer age;
    }

    @Getter
    @Setter
    @AllArgsConstructor
    @NoArgsConstructor
    @Builder
    public static class Response{
        private DeveloperLevel developerLevel;
        private DeveloperSkillType developerSkillType;
        private Integer experienceYears;

        private String memberId;
    }
}

[Controller 수정]

@PostMapping("/create-developers")
public List<String> createdevelopers(
        @Valid @RequestBody CreateDeveloper.Request request
) {
    log.info("POST /create-developers HTTP/1.1 ");
    log.info("requset : {}", request);

    dmakerService.createDeveloper(request);

    return Collections.singletonList("Olaf");
}

• @Valid : data validation 수행하기위해서 선언하는 어노테이션
• @RequestBody : JSON형태로 요청오는 데이터를 DTO형태로 변경해주는 어노테이션

2. Business Validation

[사용자 Exception 구현]

• DMakerException

@Getter
public class DMakerException extends RuntimeException {
    private DMakerErrorCode dMakerErrorCode;
    private String detailMessage;

    // 에러코드만 받아서 처리
    public DMakerException(DMakerErrorCode errorCode) {
        super(errorCode.getMessage());
        this.dMakerErrorCode = errorCode;
        this.detailMessage = errorCode.getMessage();
    }

    // 에러코드와 상세메시지 받아서 처리
    public DMakerException(DMakerErrorCode errorCode, 
					String detailMessage) {
        super(detailMessage);
        this.dMakerErrorCode = errorCode;
        this.detailMessage = errorCode.getMessage();
    }
}

• DMakerErrorCode

@Getter
@AllArgsConstructor
public enum DMakerErrorCode {
    NO_DEVELOPER("해당되는 개발자가 없습니다."),
    DUPLICATED_MEMBER_ID("MemberId가 중복되는 개발자가 없습니다."),
    LEVEL_EXPERIENCE_YEARS_NOT_MATCHED("개발자 레벨과 연차가 맞지 않습니다."),

    INTERNAL_SERVER_ERROR("서버에 오류가 발생했습니다."),
    INVALID_REQUEST("잘못된 요청입니다.");

    private final String message;
}

• DMakerService 에 validateCreateDeveloperRequest 메서드 추가

private void validateCreateDeveloperRequest(CreateDeveloper.Request request) 
				throws DMakerException {
    // Business Validation
    DeveloperLevel developerLevel = request.getDeveloperLevel();
    Integer experienceYears = request.getExperienceYears();
    if (developerLevel == DeveloperLevel.SENIOR
            && experienceYears < 10) {
        throw new DMakerException(LEVEL_EXPERIENCE_YEARS_NOT_MATCHED);
    } else if (developerLevel == DeveloperLevel.JUNGNIOR
                && (experienceYears < 4 || experienceYears > 10)) {
        throw new DMakerException(LEVEL_EXPERIENCE_YEARS_NOT_MATCHED);
    } else if (developerLevel == DeveloperLevel.JUNIOR
            && experienceYears > 4) {
        throw new DMakerException(LEVEL_EXPERIENCE_YEARS_NOT_MATCHED);
    }

    developerRepository.findByMemberId(request.getMemberId())
            .ifPresent(developer -> {
                throw new DMakerException(DUPLICATED_MEMBER_ID);
            });
}

• DeveloperLevel과 experienceYears 값 체크(업무적인 체크)