feat: 알림 중복 설정 예외처리

src/main/java/yerong/wedle/common/exception/GlobalExceptionHandler.java

@@ -15,6 +15,7 @@
 import yerong.wedle.employmentRate.exception.EmploymentRateNotFoundException;
 import yerong.wedle.member.exception.MemberNotFoundException;
 import yerong.wedle.member.exception.MemberDuplicateException;
+import yerong.wedle.notification.exception.DuplicateNotificationException;
 import yerong.wedle.notification.exception.NotificationNotFoundException;
 import yerong.wedle.oauth.exception.InvalidAuthorizationHeaderException;
 import yerong.wedle.oauth.exception.InvalidRefreshTokenException;
@@ -73,6 +74,16 @@ public ResponseEntity<ErrorResponse> handleNotificationNotFoundException(Notific
         return ResponseEntity.status(HttpStatus.NOT_FOUND).body(errorResponse);
     }
 
+    @ExceptionHandler(DuplicateNotificationException.class)
+    public ResponseEntity<ErrorResponse> handleDuplicateNotificationException(DuplicateNotificationException ex) {
+        ErrorResponse errorResponse = new ErrorResponse(
+                ResponseCode.DUPLICATION_NOTIFICATION.getCode(),
+                ResponseCode.DUPLICATION_NOTIFICATION.getMessage(),
+                LocalDateTime.now().format(FORMATTER)
+        );
+        return ResponseEntity.status(HttpStatus.NOT_FOUND).body(errorResponse);
+    }
+
     @ExceptionHandler(InvalidRefreshTokenException.class)
     public ResponseEntity<ErrorResponse> handleInvalidRefreshTokenException(InvalidRefreshTokenException ex) {
         ErrorResponse errorResponse = new ErrorResponse(

src/main/java/yerong/wedle/common/exception/ResponseCode.java

@@ -11,8 +11,9 @@ public enum ResponseCode {
     MEMBER_NOT_FOUND("404", "회원이 존재하지 않습니다."),
     MEMBER_DUPLICATE("409", "이미 존재하는 회원입니다."),
 
-    // Member
+    // Notification
     NOTIFICATION_NOT_FOUND("404", "알림이 존재하지 않습니다."),
+    DUPLICATION_NOTIFICATION("409", "이미 존재하는 알림입니다."),
 
     // OAuth
     INVALID_REFRESH_TOKEN("400", "유효하지 않은 Refresh Token입니다."),

src/main/java/yerong/wedle/notification/controller/NotificationApiController.java

@@ -22,9 +22,9 @@ public class NotificationApiController {
     @Operation(summary = "알림 생성", description = "이벤트에 대한 새로운 알림을 생성합니다.")
     @ApiResponses(value = {
             @ApiResponse(responseCode = "200", description = "알림이 성공적으로 생성되었습니다."),
-            @ApiResponse(responseCode = "400", description = "잘못된 요청 데이터")
+            @ApiResponse(responseCode = "400", description = "잘못된 요청 데이터"),
+            @ApiResponse(responseCode = "409", description = "이미 존재하는 알림입니다.")
     })
-
     @PostMapping
     public ResponseEntity<NotificationResponse> createNotification(@RequestBody @Valid CreateNotificationRequest request){
 

src/main/java/yerong/wedle/notification/exception/DuplicateNotificationException.java

@@ -0,0 +1,10 @@
+package yerong.wedle.notification.exception;
+
+import yerong.wedle.common.exception.CustomException;
+import yerong.wedle.common.exception.ResponseCode;
+
+public class DuplicateNotificationException extends CustomException {
+    public DuplicateNotificationException () {
+        super(ResponseCode.DUPLICATION_NOTIFICATION);
+    }
+}

src/main/java/yerong/wedle/notification/repository/NotificationRepository.java

@@ -16,4 +16,6 @@ public interface NotificationRepository extends JpaRepository<Notification, Long
     Notification findByEventAndMember(CalendarEvent calendarEvent, Member member);
 
     List<Notification> findByMember(Member member);
+
+    boolean existsByMemberAndEvent(Member member, CalendarEvent calendarEvent);
 }

src/main/java/yerong/wedle/notification/service/NotificationService.java

@@ -20,6 +20,7 @@
 import yerong.wedle.notification.domain.Notification;
 import yerong.wedle.notification.dto.CreateNotificationRequest;
 import yerong.wedle.notification.dto.NotificationResponse;
+import yerong.wedle.notification.exception.DuplicateNotificationException;
 import yerong.wedle.notification.repository.NotificationRepository;
 
 @Slf4j
@@ -39,6 +40,10 @@ public NotificationResponse createNotification(CreateNotificationRequest request
 
         CalendarEvent calendarEvent = getCalendarEventById(request.getEventId());
 
+        if (notificationRepository.existsByMemberAndEvent(member, calendarEvent)) {
+            throw new DuplicateNotificationException();
+        }
+
         Notification notification = Notification.builder()
                 .notificationDate(request.getNotificationDate())
                 .event(calendarEvent)