fix: 중복 세션 생성 요청 처리

Author: 1117mg

src/main/java/com/climbup/climbup/session/repository/UserSessionRepository.java

@@ -1,11 +1,15 @@
 package com.climbup.climbup.session.repository;
 
 import com.climbup.climbup.session.entity.UserSession;
-import com.climbup.climbup.user.entity.User;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
 
 import java.util.Optional;
 
 public interface UserSessionRepository extends JpaRepository<UserSession, Long> {
     Optional<UserSession> findByUserIdAndEndedAtIsNull(Long userId);
+    
+    @Query("SELECT us FROM UserSession us WHERE us.user.id = :userId AND us.endedAt IS NULL ORDER BY us.createdAt DESC LIMIT 1")
+    Optional<UserSession> findLatestActiveSessionByUserId(@Param("userId") Long userId);
 }

src/main/java/com/climbup/climbup/session/service/UserSessionServiceImpl.java

@@ -12,6 +12,7 @@
 import lombok.RequiredArgsConstructor;
 import org.springframework.transaction.annotation.Transactional;
 import org.springframework.security.access.AccessDeniedException;
+import org.springframework.dao.DataIntegrityViolationException;
 import org.springframework.stereotype.Service;
 
 import java.time.LocalDate;
@@ -31,29 +32,28 @@ public UserSession startSession(Long userId) {
         User user = userRepository.findById(userId)
                 .orElseThrow(() -> new UserNotFoundException(userId));
 
-        var activeSession = userSessionRepository.findByUserIdAndEndedAtIsNull(userId).orElse(null);
-
-        if(activeSession != null) {
+        try {
+            LocalDateTime now = LocalDateTime.now();
+            LocalDate today = now.toLocalDate();
+            
+            UserSession session = UserSession.builder()
+                    .user(user)
+                    .gym(user.getGym())
+                    .sessionDate(today)
+                    .startedAt(now)
+                    .srGained(0)
+                    .completedCount(0)
+                    .attemptedCount(0)
+                    .build();
+
+            session = userSessionRepository.save(session);
+            recommendationService.generateRecommendationsForSession(session);
+            
+            return session;
+            
+        } catch (DataIntegrityViolationException e) {
             throw new UserSessionNotYetFinishedException();
         }
-
-        LocalDateTime now = LocalDateTime.now();
-        LocalDate today = now.toLocalDate();
-        
-        UserSession session = UserSession.builder()
-                .user(user)
-                .gym(user.getGym())
-                .sessionDate(today)
-                .startedAt(now)
-                .srGained(0)
-                .completedCount(0)
-                .attemptedCount(0)
-                .build();
-
-        session = userSessionRepository.save(session);
-        recommendationService.generateRecommendationsForSession(session);
-        
-        return session;
     }
 
     @Override

src/main/java/com/climbup/climbup/user/entity/User.java

@@ -8,7 +8,6 @@
 import com.climbup.climbup.gym.exception.GymNotFoundException;
 import com.climbup.climbup.session.entity.UserSession;
 import com.climbup.climbup.sr.entity.SRHistory;
-import com.climbup.climbup.level.entity.Level;
 import jakarta.persistence.*;
 import lombok.AccessLevel;
 import lombok.Getter;