feat : SOLID - ISP 샘플 코드 구현

놀이터(예제 코드 작성)/solid-design-pattern-sample/README.md

@@ -37,6 +37,16 @@
 
 - 좌표를 입력하면 해당 좌표로 이동수단의 위치가 변한다.
 
+### ISP(Interface Segregation Principle)
+
+- 인터페이스 분리 원칙
+- 특정 클라이언트를 위한 인터페이스 여러 개가 범용 인터페이스 하나보다 낫다.
+
+#### 구현 요구사항
+
+- 영화 상영관 좌석 현황을 조회할 수 있다.
+- 영화표 예매를 진행할 수 있다.
+
 ## 참고자료
 
 - [SOLID (객체 지향 설계)](https://ko.wikipedia.org/wiki/SOLID_(%EA%B0%9D%EC%B2%B4_%EC%A7%80%ED%96%A5_%EC%84%A4%EA%B3%84)) 

놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/after/CinemaControllerAfter.kt

@@ -0,0 +1,25 @@
+package com.banjjoknim.soliddesignpatternsample.solid.isp.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.Reservation
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.SeatStatus
+import org.springframework.web.bind.annotation.GetMapping
+import org.springframework.web.bind.annotation.PostMapping
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RestController
+
+@RequestMapping("/cinemas")
+@RestController
+class CinemaControllerAfter(
+    private val seatStatusService: SeatStatusServiceAfter,
+    private val reservationService: ReservationServiceAfter
+) {
+    @GetMapping("/with-isp-get-seat-status")
+    fun getSeatStatus(): SeatStatus {
+        return seatStatusService.getSeatStatus()
+    }
+
+    @PostMapping("/with-isp-make-reservation")
+    fun makeReservation(): Reservation {
+        return reservationService.makeReservation()
+    }
+}

놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/after/ReservationService.kt

@@ -0,0 +1,7 @@
+package com.banjjoknim.soliddesignpatternsample.solid.isp.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.Reservation
+
+interface ReservationService {
+    fun makeReservation(): Reservation
+}

놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/after/ReservationServiceAfter.kt

@@ -0,0 +1,11 @@
+package com.banjjoknim.soliddesignpatternsample.solid.isp.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.Reservation
+import org.springframework.stereotype.Service
+
+@Service
+class ReservationServiceAfter : ReservationService {
+    override fun makeReservation(): Reservation {
+        return Reservation(seat = "A1", id = 1L)
+    }
+}

놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/after/SeatStatusService.kt

@@ -0,0 +1,7 @@
+package com.banjjoknim.soliddesignpatternsample.solid.isp.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.SeatStatus
+
+interface SeatStatusService {
+    fun getSeatStatus(): SeatStatus
+}

놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/after/SeatStatusServiceAfter.kt

@@ -0,0 +1,12 @@
+package com.banjjoknim.soliddesignpatternsample.solid.isp.after
+
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.SeatStatus
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.SeatStatusType
+import org.springframework.stereotype.Service
+
+@Service
+class SeatStatusServiceAfter : SeatStatusService {
+    override fun getSeatStatus(): SeatStatus {
+        return SeatStatus(SeatStatusType.CAN_RESERVATION)
+    }
+}

놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/before/CinemaControllerBefore.kt

@@ -0,0 +1,25 @@
+package com.banjjoknim.soliddesignpatternsample.solid.isp.before
+
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.Reservation
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.SeatStatus
+import org.springframework.web.bind.annotation.GetMapping
+import org.springframework.web.bind.annotation.PostMapping
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RestController
+
+@RequestMapping("/cinemas")
+@RestController
+class CinemaControllerBefore(
+    private val seatStatusService: SeatStatusServiceBefore,
+    private val reservationService: ReservationServiceBefore,
+) {
+    @GetMapping("/none-isp-get-seat-status")
+    fun getSeatStatus(): SeatStatus {
+        return seatStatusService.getSeatStatus()
+    }
+
+    @PostMapping("/none-isp-make-reservation")
+    fun makeReservation(): Reservation {
+        return reservationService.makeReservation()
+    }
+}

놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/before/CinemaService.kt

@@ -0,0 +1,10 @@
+package com.banjjoknim.soliddesignpatternsample.solid.isp.before
+
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.Reservation
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.SeatStatus
+
+interface CinemaService {
+    fun makeReservation(): Reservation
+
+    fun getSeatStatus(): SeatStatus
+}

놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/before/ReservationServiceBefore.kt

@@ -0,0 +1,16 @@
+package com.banjjoknim.soliddesignpatternsample.solid.isp.before
+
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.Reservation
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.SeatStatus
+import org.springframework.stereotype.Service
+
+@Service
+class ReservationServiceBefore : CinemaService {
+    override fun makeReservation(): Reservation {
+        return Reservation(seat = "A1", id = 1L)
+    }
+
+    override fun getSeatStatus(): SeatStatus {
+        throw UnsupportedOperationException("좌석 현황 조회는 지원하지 않습니다.") // 불필요함에도 불구하고 구현해주어야 한다.
+    }
+}

놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/before/SeatStatusServiceBefore.kt

@@ -0,0 +1,17 @@
+package com.banjjoknim.soliddesignpatternsample.solid.isp.before
+
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.Reservation
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.SeatStatus
+import com.banjjoknim.soliddesignpatternsample.solid.isp.common.SeatStatusType
+import org.springframework.stereotype.Service
+
+@Service
+class SeatStatusServiceBefore : CinemaService {
+    override fun makeReservation(): Reservation {
+        throw UnsupportedOperationException("영화표 예매는 지원하지 않습니다.") // 불필요함에도 불구하고 구현해주어야 한다.
+    }
+
+    override fun getSeatStatus(): SeatStatus {
+        return SeatStatus(SeatStatusType.CAN_RESERVATION)
+    }
+}

놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/common/Reservation.kt

@@ -0,0 +1,11 @@
+package com.banjjoknim.soliddesignpatternsample.solid.isp.common
+
+import javax.persistence.Entity
+import javax.persistence.Id
+
+@Entity
+class Reservation(
+    val seat: String,
+    @Id
+    val id: Long = 0L
+)

놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/common/SeatStatus.kt

@@ -0,0 +1,5 @@
+package com.banjjoknim.soliddesignpatternsample.solid.isp.common
+
+data class SeatStatus(
+    val type: SeatStatusType
+)

놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/solid/isp/common/SeatStatusType.kt

@@ -0,0 +1,6 @@
+package com.banjjoknim.soliddesignpatternsample.solid.isp.common
+
+enum class SeatStatusType {
+    CAN_RESERVATION,
+    CANNOT_RESERVATION
+}