feat: 트랜잭션 분리를 위한 별도 유틸 클래스 생성

src/main/kotlin/roomescape/common/util/TransactionExecutionUtil.kt

@@ -0,0 +1,31 @@
+package roomescape.common.util
+
+import io.github.oshai.kotlinlogging.KLogger
+import io.github.oshai.kotlinlogging.KotlinLogging
+import org.springframework.stereotype.Component
+import org.springframework.transaction.PlatformTransactionManager
+import org.springframework.transaction.TransactionDefinition
+import org.springframework.transaction.support.TransactionTemplate
+import roomescape.common.exception.CommonErrorCode
+import roomescape.common.exception.RoomescapeException
+
+private val log: KLogger = KotlinLogging.logger {}
+
+@Component
+class TransactionExecutionUtil(
+    private val transactionManager: PlatformTransactionManager
+) {
+
+    fun <T> withNewTransaction(isReadOnly: Boolean, action: () -> T): T {
+        val transactionTemplate = TransactionTemplate(transactionManager).apply {
+            this.isReadOnly = isReadOnly
+            this.propagationBehavior = TransactionDefinition.PROPAGATION_REQUIRES_NEW
+        }
+
+        return transactionTemplate.execute { action() }
+            ?: run {
+                log.error { "[TransactionExecutionUtil.withNewTransaction] 트랜잭션 작업 중 예상치 못한 null 반환 " }
+                throw RoomescapeException(CommonErrorCode.UNEXPECTED_SERVER_ERROR)
+            }
+    }
+}