fix: tx없이 Lock획득 시도하는 버그를 수정한다

Author: devxb

src/main/kotlin/org/gitanimals/quiz/domain/context/QuizSolveContextRepository.kt

@@ -13,10 +13,16 @@ interface QuizSolveContextRepository : JpaRepository<QuizSolveContext, Long> {
         solvedAt: LocalDate,
     ): QuizSolveContext?
 
-    @Lock(LockModeType.PESSIMISTIC_WRITE)
     @Query("select q from QuizSolveContext q join fetch q.quizSolveContextQuiz where q.id = :id and q.userId = :userId")
     fun findByIdAndUserId(
         id: Long,
         userId: Long,
     ): QuizSolveContext?
+
+    @Lock(LockModeType.PESSIMISTIC_WRITE)
+    @Query("select q from QuizSolveContext q join fetch q.quizSolveContextQuiz where q.id = :id and q.userId = :userId")
+    fun findByIdAndUserIdWithLock(
+        id: Long,
+        userId: Long,
+    ): QuizSolveContext?
 }

src/main/kotlin/org/gitanimals/quiz/domain/context/QuizSolveContextService.kt

@@ -44,18 +44,26 @@ class QuizSolveContextService(
 
     @Transactional
     fun solveQuiz(id: Long, userId: Long, answer: String) {
-        val quizSolveContext = getQuizSolveContextByIdAndUserId(id, userId)
+        val quizSolveContext = getQuizSolveContextByIdAndUserIdWithLock(id, userId)
 
         quizSolveContext.solve(answer)
     }
 
     @Transactional
     fun stopQuizByIdAndUserId(id: Long, userId: Long) {
-        val quizSolveContext = getQuizSolveContextByIdAndUserId(id, userId)
+        val quizSolveContext = getQuizSolveContextByIdAndUserIdWithLock(id, userId)
 
         quizSolveContext.stopSolve()
     }
 
+    private fun getQuizSolveContextByIdAndUserIdWithLock(
+        id: Long,
+        userId: Long
+    ): QuizSolveContext {
+        return quizSolveContextRepository.findByIdAndUserIdWithLock(id, userId)
+            ?: throw IllegalArgumentException("Cannot find quizContext by id: \"$id\" and userId: \"$userId\"")
+    }
+
     fun getQuizSolveContextByIdAndUserId(
         id: Long,
         userId: Long