src/main/kotlin/roomescape/reservation/infrastructure/persistence/ReservationRepository.kt

@@ -11,7 +11,7 @@ import java.time.LocalDate
 
 interface ReservationRepository
     : JpaRepository<ReservationEntity, Long>, JpaSpecificationExecutor<ReservationEntity> {
-    fun findByTime(time: TimeEntity): List<ReservationEntity>
+    fun findAllByTime(time: TimeEntity): List<ReservationEntity>
 
     fun findByDateAndThemeId(date: LocalDate, themeId: Long): List<ReservationEntity>
 

src/main/kotlin/roomescape/time/business/TimeService.kt

@@ -1,13 +1,12 @@
 package roomescape.time.business
 
 import org.springframework.data.repository.findByIdOrNull
-import org.springframework.http.HttpStatus
 import org.springframework.stereotype.Service
 import org.springframework.transaction.annotation.Transactional
-import roomescape.common.exception.ErrorType
-import roomescape.common.exception.RoomescapeException
 import roomescape.reservation.infrastructure.persistence.ReservationEntity
 import roomescape.reservation.infrastructure.persistence.ReservationRepository
+import roomescape.time.exception.TimeErrorCode
+import roomescape.time.exception.TimeException
 import roomescape.time.infrastructure.persistence.TimeEntity
 import roomescape.time.infrastructure.persistence.TimeRepository
 import roomescape.time.web.*
@@ -21,42 +20,33 @@ class TimeService(
 ) {
     @Transactional(readOnly = true)
     fun findById(id: Long): TimeEntity = timeRepository.findByIdOrNull(id)
-            ?: throw RoomescapeException(
-                    ErrorType.TIME_NOT_FOUND,
-                    "[timeId: $id]",
-                    HttpStatus.BAD_REQUEST
-            )
+            ?: throw TimeException(TimeErrorCode.TIME_NOT_FOUND)
 
     @Transactional(readOnly = true)
-    fun findTimes(): TimeRetrieveListResponse = timeRepository.findAll().toRetrieveListResponse()
+    fun findTimes(): TimeRetrieveListResponse = timeRepository.findAll()
+            .toResponse()
 
     @Transactional
-    fun createTime(timeCreateRequest: TimeCreateRequest): TimeCreateResponse {
-        val startAt: LocalTime = timeCreateRequest.startAt
-
+    fun createTime(request: TimeCreateRequest): TimeCreateResponse {
+        val startAt: LocalTime = request.startAt
         if (timeRepository.existsByStartAt(startAt)) {
-            throw RoomescapeException(
-                    ErrorType.TIME_DUPLICATED, "[startAt: $startAt]", HttpStatus.CONFLICT
-            )
+            throw TimeException(TimeErrorCode.TIME_DUPLICATED)
         }
 
-        return TimeEntity(startAt = startAt)
-                .also { timeRepository.save(it) }
-                .toCreateResponse()
+        val time: TimeEntity = request.toEntity()
+
+        return timeRepository.save(time).toCreateResponse()
     }
 
     @Transactional
     fun deleteTime(id: Long) {
         val time: TimeEntity = findById(id)
-        reservationRepository.findByTime(time)
-                .also {
-                    if (it.isNotEmpty()) {
-                        throw RoomescapeException(
-                                ErrorType.TIME_IS_USED_CONFLICT, "[timeId: $id]", HttpStatus.CONFLICT
-                        )
-                    }
-                    timeRepository.deleteById(id)
-                }
+        val reservations: List<ReservationEntity> = reservationRepository.findAllByTime(time)
+
+        if (reservations.isNotEmpty()) {
+            throw TimeException(TimeErrorCode.TIME_ALREADY_RESERVED)
+        }
+        timeRepository.delete(time)
     }
 
     @Transactional(readOnly = true)
@@ -66,7 +56,6 @@ class TimeService(
 
         return TimeWithAvailabilityListResponse(allTimes.map { time ->
             val isAvailable: Boolean = reservations.none { reservation -> reservation.time.id == time.id }
-
             TimeWithAvailabilityResponse(time.id!!, time.startAt, isAvailable)
         })
     }

src/main/kotlin/roomescape/time/exception/TimeErrorCode.kt

@@ -0,0 +1,14 @@
+package roomescape.time.exception
+
+import org.springframework.http.HttpStatus
+import roomescape.common.exception.ErrorCode
+
+enum class TimeErrorCode(
+        override val httpStatus: HttpStatus,
+        override val errorCode: String,
+        override val message: String
+) : ErrorCode {
+    TIME_NOT_FOUND(HttpStatus.NOT_FOUND, "TM001", "시간을 찾을 수 없어요."),
+    TIME_DUPLICATED(HttpStatus.BAD_REQUEST, "TM002", "이미 같은 시간이 있어요."),
+    TIME_ALREADY_RESERVED(HttpStatus.CONFLICT, "TM003", "예약된 시간이라 삭제할 수 없어요.")
+}

src/main/kotlin/roomescape/time/exception/TimeException.kt

@@ -0,0 +1,9 @@
+package roomescape.time.exception
+
+import roomescape.common.exception.ErrorCode
+import roomescape.common.exception.RoomescapeExceptionV2
+
+class TimeException(
+        override val errorCode: ErrorCode,
+        override val message: String = errorCode.message
+) : RoomescapeExceptionV2(errorCode, message)

src/main/kotlin/roomescape/time/web/TimeDTO.kt

@@ -10,6 +10,8 @@ data class TimeCreateRequest(
         val startAt: LocalTime
 )
 
+fun TimeCreateRequest.toEntity(): TimeEntity = TimeEntity(startAt = this.startAt)
+
 @Schema(name = "예약 시간 정보", description = "예약 시간 추가 및 조회 응답시 사용됩니다.")
 data class TimeCreateResponse(
         @Schema(description = "시간 식별자")
@@ -29,14 +31,14 @@ data class TimeRetrieveResponse(
         val startAt: LocalTime
 )
 
-fun TimeEntity.toRetrieveResponse(): TimeRetrieveResponse = TimeRetrieveResponse(this.id!!, this.startAt)
+fun TimeEntity.toResponse(): TimeRetrieveResponse = TimeRetrieveResponse(this.id!!, this.startAt)
 
 data class TimeRetrieveListResponse(
         val times: List<TimeRetrieveResponse>
 )
 
-fun List<TimeEntity>.toRetrieveListResponse(): TimeRetrieveListResponse = TimeRetrieveListResponse(
-        this.map { it.toRetrieveResponse() }
+fun List<TimeEntity>.toResponse(): TimeRetrieveListResponse = TimeRetrieveListResponse(
+        this.map { it.toResponse() }
 )
 
 data class TimeWithAvailabilityResponse(