Kopring으로 효율적인 백엔드 구성하기

KotlinConf 2023 Global in Songdo에서 Java+Spring에서 Kotiln 으로 언어 변경 시 얻을 수 있는 이점을 소개한 자료입니다.

Transcript

1. 김병수 KotlinConf’23 Global in Songdo GDG Songdo X Incheon Kopring으로 효율적인 백엔드 구성하기
2. Autocrypt - Backend Engineer - Data Engineer - Kotlin + Spring - 정의에 대한 고민 - 코드의 아름다움
3. Java + Spring Boot => Kotlin + Spring Boot 코드 개선 여정
4. 서비스 요구사항 - 기사의 주행 데이터 수집 - 1초당 위치 정보 수집 - 1분당 주소 정보 저장 - 주소 정보 조회 시 1sec 소요 - 일반적으로 주행은 약 20분 소요
5. Java + Spring Code
6. Kotlin으로 언어를 변경한다면 어떤 장점이 있을까요?
7. 1. 가독성 향상 2. 유용한 Extension function 3. 간단한 비동기 처리
8. 다크모드 전환
9. Entity 설계
10. @Entity @NoArgsConstructor @AllArgsConstructor @Getter @Setter public class Driver { @Id @Column private String id; @Column private String name; @Column private String mobileNumber; @Column private LocalDateTime createDate; } Entity 설계
11. @Entity class Driver ( @Id @Column val id: String = StringUtil.uuid(), @Column var name: String = "", @Column var mobileNumber: String? = null, @Column val createDate: LocalDateTime = LocalDateTime.now(), ) @Entity @NoArgsConstructor @AllArgsConstructor @Getter @Setter public class Driver { @Id @Column private String id; @Column private String name; @Column private String mobileNumber; @Column private LocalDateTime createDate; } Entity 설계 Java Kotlin
12. @Entity class Driver ( @Id @Column val id: String = StringUtil.uuid(), @Column var name: String = "", @Column var mobileNumber: String? = null, @Column val createDate: LocalDateTime = LocalDateTime.now(), ) @Entity @NoArgsConstructor @AllArgsConstructor @Getter @Setter public class Driver { @Id @Column private String id; @Column private String name; @Column private String mobileNumber; @Column private LocalDateTime createDate; } Entity 설계 Java Kotlin
13. Entity 설계 @Entity class Driver ( @Id @Column val id: String = StringUtil.uuid(), @Column var name: String = "", @Column var mobileNumber: String? = null, @Column val createDate: LocalDateTime = LocalDateTime.now(), ) @Entity @NoArgsConstructor @AllArgsConstructor @Getter @Setter public class Driver { @Id @Column private String id; @Column private String name; @Column private String mobileNumber; @Column private LocalDateTime createDate; } Java Kotlin
14. @Entity class Driver ( @Id @Column val id: String = StringUtil.uuid(), @Column var name: String = "", @Column var mobileNumber: String? = null, @Column val createDate: LocalDateTime = LocalDateTime.now(), ) @Entity @NoArgsConstructor @AllArgsConstructor @Getter @Setter public class Driver { @Id @Column private String id; @Column private String name; @Column private String mobileNumber; @Column private LocalDateTime createDate; } Entity 설계 Java Kotlin
15. val driver = Driver( id = StringUtil.uuid(), name = "", mobileNumber = null, createDate = LocalDateTime.now() ) Driver driver = new Driver( StringUtil.uuid(), "", null, LocalDateTime.now() ); Java Kotlin Entity 설계
16. val driver = Driver( id = StringUtil.uuid(), name = "", mobileNumber = null, createDate = LocalDateTime.now() ) Driver driver = new Driver( StringUtil.uuid(), "", null, LocalDateTime.now() ); Java Kotlin Entity 설계
17. Entity 설계 class Driving ( val id: String = StringUtil.uuid(), var startTime: LocalDateTime = LocalDateTime.now(), var endTime: LocalDateTime? = null, var driver: Driver? = null, var vehicle: Vehicle? = null, var departureAddress: String = "", var destinationAddress: String? = null, // ... // ... var customerName: String = "", var customerMobileNumber: String? = null, var customerEmailAddress: String? = null, var drivingDistance: Double? = null, val createDate: LocalDateTime = LocalDateTime.now(), var updateDate: LocalDateTime = LocalDateTime.now(), )
18. val driving = Driving( startTime = startTime, endTime = endTime, customerName = customerName, departureAddress = departureAddress, destinationAddress = destinationAddress, ) Driving driving = new Driving( StringUtil.uuid(), startTime, endTime, null, null, departureAddress, destinationAddress, // ... customerName, null, null, null, LocalDateTime.now(), LocalDateTime.now() ) Java Kotlin Entity 설계
19. val driving = Driving( startTime = startTime, endTime = endTime, customerName = customerName, departureAddress = departureAddress, destinationAddress = destinationAddress, ) Driving driving = new Driving( StringUtil.uuid(), startTime, endTime, null, null, departureAddress, destinationAddress, // ... customerName, null, null, null, LocalDateTime.now(), LocalDateTime.now() ) Java Kotlin Entity 설계 ???
20. val driving = Driving( startTime = startTime, endTime = endTime, customerName = customerName, departureAddress = departureAddress, destinationAddress = destinationAddress, ) Driving driving = new Driving( StringUtil.uuid(), startTime, endTime, null, null, departureAddress, destinationAddress, // ... customerName, null, null, null, LocalDateTime.now(), LocalDateTime.now() ) Java Kotlin Entity 설계
21. 1. Getter & Setter 제거 a. 주의: Lombok 사용 불가 2. Named Parameter 3. Default Constructor Entity 설계 => 가독성 향상
22. 참고 Kotlin 전환 시 Lombok 에 대하여
23. dependencies { implementation("org.springframework.boot:spring-boot-starter-web") implementation("com.fasterxml.jackson.module:jackson-module-kotlin") implementation("org.springframework.boot:spring-boot-starter-data-jdbc") implementation("org.springframework.boot:spring-boot-starter-data-jpa") implementation("org.jetbrains.kotlin:kotlin-reflect") // mariadb implementation ("org.mariadb.jdbc:mariadb-java-client") // encoding decoding codec implementation ("commons-codec:commons-codec:1.15") // coroutine implementation("org.jetbrains.kotlinx:kotlinx-coroutines-reactor") testImplementation("org.springframework.boot:spring-boot-starter-test") } 적용한 dependencies
24. dependencies { implementation("org.springframework.boot:spring-boot-starter-web") implementation("com.fasterxml.jackson.module:jackson-module-kotlin") implementation("org.springframework.boot:spring-boot-starter-data-jdbc") implementation("org.springframework.boot:spring-boot-starter-data-jpa") implementation("org.jetbrains.kotlin:kotlin-reflect") // mariadb implementation ("org.mariadb.jdbc:mariadb-java-client") // encoding decoding codec implementation ("commons-codec:commons-codec:1.15") // coroutine implementation("org.jetbrains.kotlinx:kotlinx-coroutines-reactor") testImplementation("org.springframework.boot:spring-boot-starter-test") } 적용한 dependencies No Lombok!
25. 주의할 점 Kotlin Java … Annotation Processing … .class .class 1 2 No Code, Lombok Processed
26. 주의할 점
27. Business Logic 구현
28. Driving - foo - drivingPath - bar Location - drivingId - ord - lat - lng - address? Business Logic 구현
29. fun doneDriving( drivingId: String ): DoneDrivingRes { val driving = drivingRepository .findFirstById( drivingId ) ?: return DoneDrivingRes(null) val path = locationService .getLocationListByDrivingId( drivingId = driving.id ) driving.setDrivingDistance(path) /* other business logic */ /* other business logic */ drivingRepository.save(driving) locationService.updateAddress(path) return DoneDrivingRes( buildDrivingDto(driving) ) } Business Logic 구현
30. fun doneDriving( drivingId: String ): DoneDrivingRes { val driving = drivingRepository .findFirstById( drivingId ) ?: return DoneDrivingRes(null) val path = locationService .getLocationListByDrivingId( drivingId = driving.id ) driving.setDrivingDistance(path) /* other business logic */ /* other business logic */ drivingRepository.save(driving) locationService.updateAddress(path) return DoneDrivingRes( buildDrivingDto(driving) ) } Business Logic 구현
31. Location - drivingId - ord - lat - lng - address? Business Logic 구현 drivingId ord lat lng address testId 0 37.387540 126.638847 null testId 1 37.386466 126.639485 null … … … … … testId 59 37.392561 126.635330 null testId 60 37.393679 126.634572 null testId 61 37.395486 126.633526 null … … … … …
32. Location - drivingId - ord - lat - lng - address? Business Logic 구현 drivingId ord lat lng address testId 0 37.387540 126.638847 null testId 1 37.386466 126.639485 null … … … … … testId 59 37.392561 126.635330 null testId 60 37.393679 126.634572 null testId 61 37.395486 126.633526 null … … … … …
33. Location - drivingId - ord - lat - lng - address? Business Logic 구현 drivingId ord lat lng address testId 0 37.387540 126.638847 인천 연수구 … testId 1 37.386466 126.639485 null … … … … … testId 59 37.392561 126.635330 null testId 60 37.393679 126.634572 인천 연수구 … testId 61 37.395486 126.633526 null … … … … …
34. private void updateAddress( List<Location> path ) throws InterruptedException { for(int i=0; i<path.size(); i+=60) { Location location = path.get(i); location.setAddress( findAddress( location.getLat(), location.getLng() ) ); } } Business Logic 구현
35. private void updateAddress( List<Location> path ) throws InterruptedException { for(int i=0; i<path.size(); i+=60) { Location location = path.get(i); location.setAddress( findAddress( location.getLat(), location.getLng() ) ); } } Business Logic 구현
36. private String findAddress( Double lat, Double lng ) throws InterruptedException { Thread.sleep(1000); return "address"; } Business Logic 구현
37. private void updateAddress( List<Location> path ) throws InterruptedException { for(int i=0; i<path.size(); i+=60) { Location location = path.get(i); location.setAddress( findAddress( location.getLat(), location.getLng() ) ); } } Business Logic 구현
38. fun updateAddress( path: List<Location> ) { path .chunked(60) .map { chunk -> val location = chunk .first() location.address = findAddress( lat = location.lat, lng = location.lng, ) location } // 후략 Java Kotlin private void updateAddress( List<Location> path ) throws InterruptedException { for(int i=0; i<path.size(); i+=60) { Location location = path.get(i); location.setAddress( findAddress( location.getLat(), location.getLng() ) ); } } Business Logic 구현
39. fun updateAddress( path: List<Location> ) { path .chunked(60) .map { chunk -> val location = chunk .first() location.address = findAddress( lat = location.lat, lng = location.lng, ) location } // 후략 Java Kotlin private void updateAddress( List<Location> path ) throws InterruptedException { for(int i=0; i<path.size(); i+=60) { Location location = path.get(i); location.setAddress( findAddress( location.getLat(), location.getLng() ) ); } } Business Logic 구현
40. fun updateAddress( path: List<Location> ) { path .chunked(60) .map { chunk -> val location = chunk .first() location.address = findAddress( lat = location.lat, lng = location.lng, ) location } // 후략 Java Kotlin private void updateAddress( List<Location> path ) throws InterruptedException { for(int i=0; i<path.size(); i+=60) { Location location = path.get(i); location.setAddress( findAddress( location.getLat(), location.getLng() ) ); } } 다시, 주행 종료 API로 돌아가봅시다 Business Logic 구현
41. fun doneDriving( drivingId: String ): DoneDrivingRes { val driving = drivingRepository .findFirstById( drivingId ) ?: return DoneDrivingRes(null) val path = locationService .getLocationListByDrivingId( drivingId = driving.id ) driving.setDrivingDistance(path) /* other business logic */ /* other business logic */ drivingRepository.save(driving) locationService.updateAddress(path) return DoneDrivingRes( buildDrivingDto(driving) ) } Business Logic 구현
42. fun doneDriving( drivingId: String ): DoneDrivingRes { val driving = drivingRepository .findFirstById( drivingId ) ?: return DoneDrivingRes(null) val path = locationService .getLocationListByDrivingId( drivingId = driving.id ) driving.setDrivingDistance(path) /* other business logic */ /* other business logic */ drivingRepository.save(driving) locationService.updateAddress(path) return DoneDrivingRes( buildDrivingDto(driving) ) } Business Logic 구현
43. Location - drivingId - ord - lat - lng - address? Business Logic 구현 drivingId ord lat lng address testId 0 37.387540 126.638847 null testId 1 37.386466 126.639485 null … … … … … testId 59 37.392561 126.635330 null testId 60 37.393679 126.634572 null testId 61 37.395486 126.633526 null … … … … …
44. Business Logic 구현 drivingId ord lat lng address testId 0 37.387540 126.638847 null testId 1 37.386466 126.639485 null … … … … … testId 59 37.392561 126.635330 null testId 60 37.393679 126.634572 null testId 61 37.395486 126.633526 null … … … … … +Distance +Distance +Distance Driving Distance
45. driving .setDrivingDistance( getDistanceOfPath( path ) ); driving.setDrivingDistance(path) // 후략 } fun Driving.setDrivingDistance( path: List<Location> ) { this.drivingDistance = locationService .getDistanceOfPath(path) } Java Kotlin Business Logic 구현
46. driving.setDrivingDistance(path) // 후략 } fun Driving.setDrivingDistance( path: List<Location> ) { this.drivingDistance = locationService .getDistanceOfPath(path) } driving .setDrivingDistance( getDistanceOfPath( path ) ); Java Kotlin Business Logic 구현
47. driving .setDrivingDistance( getDistanceOfPath( path ) ); Java Kotlin driving.setDrivingDistance(path) // 후략 } fun Driving.setDrivingDistance( path: List<Location> ) { this.drivingDistance = locationService .getDistanceOfPath(path) } Business Logic 구현
48. public Double getDistanceOfPath( List<Location> path ) { double distance = 0.0; for(int i = 1; i < path.size(); i++) { distance += GeoUtil .calculateDistance( path.get(i-1), path.get(i) ); } return distance; } fun getDistanceOfPath( locationList: List<Location> ): Double = locationList .calculateDistanceOfPath() Java Kotlin Business Logic 구현
49. public Double getDistanceOfPath( List<Location> path ) { double distance = 0.0; for(int i = 1; i < path.size(); i++) { distance += GeoUtil .calculateDistance( path.get(i-1), path.get(i) ); } return distance; } Java Kotlin fun getDistanceOfPath( locationList: List<Location> ): Double = locationList .calculateDistanceOfPath() Business Logic 구현
50. fun List<Location> .calculateDistanceOfPath(): Double = List(this.size) { index -> if(index < 1) return 0.0 GeoUtil.calculateDistance( this[index - 1], this[index] ) } .sum() fun getDistanceOfPath( locationList: List<Location> ): Double = locationList .calculateDistanceOfPath() Business Logic 구현
51. • forEach / map / let • custom Extensions => 유용한 Extension Functions Business Logic 구현
52. 성능 개선
53. fun updateAddress( path: List<Location> ) { path .chunked(60) .map { chunk -> val location = chunk .first() location.address = findAddress( lat = location.lat, lng = location.lng, ) location } // 후략 Java Kotlin private void updateAddress( List<Location> path ) throws InterruptedException { for(int i=0; i<path.size(); i+=60) { Location location = path.get(i); location.setAddress( findAddress( location.getLat(), location.getLng() ) ); } } updateAddress 기능을 살펴봅시다 성능 개선
54. fun updateAddress( path: List<Location> ) { path .chunked(60) .map { chunk -> val location = chunk .first() location.address = findAddress( lat = location.lat, lng = location.lng, ) location } // 후략 Java Kotlin private void updateAddress( List<Location> path ) throws InterruptedException { for(int i=0; i<path.size(); i+=60) { Location location = path.get(i); location.setAddress( findAddress( location.getLat(), location.getLng() ) ); } } 성능 개선
55. fun updateAddress( path: List<Location> ) { path .chunked(6) .map { chunk -> val location = chunk .first() location.address = findAddress( lat = location.lat, lng = location.lng, ) location } // 후략 Java Kotlin private void updateAddress( List<Location> path ) throws InterruptedException { for(int i=0; i<path.size(); i+=6) { Location location = path.get(i); location.setAddress( findAddress( location.getLat(), location.getLng() ) ); } } 약 20분 주행, 1초에 한 번 위치 수집, 1분에 한 번 주소 저장 => 1200개 위치 데이터, 20s 소요 성능 개선
56. fun updateAddress( path: List<Location> ) { path .chunked(6) .map { chunk -> val location = chunk .first() location.address = findAddress( lat = location.lat, lng = location.lng, ) location } // 후략 Java Kotlin private void updateAddress( List<Location> path ) throws InterruptedException { for(int i=0; i<path.size(); i+=6) { Location location = path.get(i); location.setAddress( findAddress( location.getLat(), location.getLng() ) ); } } 약 20분 주행, 1초에 한 번 위치 수집, 5초에 한 번 주소 저장 => 1200개 위치 데이터, 240s 소요 성능 개선
57. fun updateAddress( path: List<Location> ) { path .chunked(60) .map { chunk -> val location = chunk .first() location.address = findAddress( lat = location.lat, lng = location.lng, ) location } // 후략 Java Kotlin private void updateAddress( List<Location> path ) throws InterruptedException { for(int i=0; i<path.size(); i+=60) { Location location = path.get(i); location.setAddress( findAddress( location.getLat(), location.getLng() ) ); } } 성능 개선
58. fun updateAddressAsync( path: List<Location> ) { CoroutineScope(Dispatchers.IO).launch { val deferredPath = path .chunked(60) .map { locationChunk -> async { val top = locationChunk .first() top.address = findAddress( lat = top.lat, lng = top.lng ) top } } val addressedPath = deferredPath.awaitAll() fun updateAddress( path: List<Location> ) { path .chunked(60) .map { chunk -> val location = chunk .first() location.address = findAddress( lat = location.lat, lng = location.lng, ) location } // 후략 성능 개선
59. • Coroutine 성능 개선 => 간단한 비동기 처리
60. 다크모드 종료
61. 정리
62. 1. 가독성 향상 2. 유용한 Extension function 3. 간단한 비동기 처리
63. Come with me, Use Kopring
64. QnA & EOF