[EA3-200] refactor: 스터디 참여 제한 로직 수정

Author: pia01190

src/main/java/grep/neogulcoder/domain/study/Study.java

@@ -50,6 +50,8 @@ public class Study extends BaseEntity {
     @Version
     private Long version;
 
+    private static final int MAX_JOINED_STUDY_COUNT = 10;
+
     protected Study() {
     }
 
@@ -122,4 +124,8 @@ public boolean isReviewableAt(LocalDateTime currentDateTime) {
         return (currentDateTime.isEqual(this.endDate) || currentDateTime.isAfter(this.endDate)) &&
                 (currentDateTime.isEqual(reviewableDateTime) || currentDateTime.isBefore(reviewableDateTime));
     }
+
+    public static boolean isOverJoinLimit(int joinedStudyCount) {
+        return joinedStudyCount >= MAX_JOINED_STUDY_COUNT;
+    }
 }

src/main/java/grep/neogulcoder/domain/study/service/StudyService.java

@@ -40,9 +40,9 @@
 import java.util.List;
 import java.util.Optional;
 
-import static grep.neogulcoder.domain.study.enums.StudyMemberRole.LEADER;
+import static grep.neogulcoder.domain.study.enums.StudyMemberRole.*;
 import static grep.neogulcoder.domain.study.exception.code.StudyErrorCode.*;
-import static grep.neogulcoder.domain.users.exception.code.UserErrorCode.USER_NOT_FOUND;
+import static grep.neogulcoder.domain.users.exception.code.UserErrorCode.*;
 
 @Transactional(readOnly = true)
 @RequiredArgsConstructor
@@ -184,8 +184,8 @@ private StudyMember getStudyMemberById(Long studyId, Long userId) {
     }
 
     private void validateStudyCreateLimit(Long userId) {
-        int count = studyRepository.countByUserIdAndActivatedTrueAndFinishedFalse(userId);
-        if (count >= 10) {
+        int joinedStudyCount = studyRepository.countByUserIdAndActivatedTrueAndFinishedFalse(userId);
+        if (Study.isOverJoinLimit(joinedStudyCount)) {
             throw new BusinessException(STUDY_CREATE_LIMIT_EXCEEDED);
         }
     }

src/main/java/grep/neogulcoder/domain/studyapplication/service/ApplicationService.java

@@ -170,15 +170,15 @@ private void validateOnlyLeaderCanReject(Study study, Long userId) {
     }
 
     private void validateApplicantStudyLimit(Long userId) {
-        int count = studyMemberQueryRepository.countActiveUnfinishedStudies(userId);
-        if (count >= 10) {
+        int joinedStudyCount = studyMemberQueryRepository.countActiveUnfinishedStudies(userId);
+        if (Study.isOverJoinLimit(joinedStudyCount)) {
             throw new BusinessException(APPLICATION_PARTICIPATION_LIMIT_EXCEEDED);
         }
     }
 
     private void validateParticipantStudyLimit(Long userId) {
-        int count = studyMemberQueryRepository.countActiveUnfinishedStudies(userId);
-        if (count >= 10) {
+        int joinedStudyCount = studyMemberQueryRepository.countActiveUnfinishedStudies(userId);
+        if (Study.isOverJoinLimit(joinedStudyCount)) {
             throw new BusinessException(APPLICATION_PARTICIPANT_LIMIT_EXCEEDED);
         }
     }