Redis Cache 처리 시 주의점
1. 기본 생성자가 있어야 한다
1) 캐시처리를 적용할 메소드의 반환 class에 기본 생성자가 있어야 함
2) Dto에는 @NoArgsConstructor 붙여 주어야 함
3) Page는 기본 생성자가 없음…
2. Serializer, Deserializer 적용
RedisCacheConfig 설정에 적용
@Configuration
@EnableCaching
public class RedisCacheConfig {
@Bean
public RedisCacheManager cacheManager(RedisConnectionFactory connectionFactory) {
RedisCacheConfiguration cacheConfiguration = RedisCacheConfiguration.defaultCacheConfig()
.entryTtl(Duration.ofHours(1))
.disableCachingNullValues()
.serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(new StringRedisSerializer()))
.serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(new GenericJackson2JsonRedisSerializer()));
return RedisCacheManager.RedisCacheManagerBuilder
.fromConnectionFactory(connectionFactory)
.cacheDefaults(cacheConfiguration)
.build();
}
}❗Page <'T'> 의 기본생성자가 없는 문제 해결하기
👉 PageImpl<'T'>을 상속 받은 RestPage<'T'> 라는 Wrapper class를 적용
@JsonIgnoreProperties(ignoreUnknown = true, value = {"pageable"})
public class RestPage<T> extends PageImpl<T> {
@JsonCreator(mode = JsonCreator.Mode.PROPERTIES)
public RestPage(@JsonProperty("content") java.util.List<T> content,
@JsonProperty("number") int page,
@JsonProperty("size") int size,
@JsonProperty("totalElements") long totalElements) {
super(content, PageRequest.of(page, size), totalElements);
}
public RestPage(Page<T> page) {
super(page.getContent(), page.getPageable(), page.getTotalElements());
}
public RestPage(List<T> content, Pageable pageable, Long total) {
super(content, pageable, total);
}
}기존 코드
public Page<ReservationResponseDto> findReservations(Pageable pageable, String status, User user) {
ReservationStatus reservationStatus = ReservationStatus.valueOf(status.toUpperCase());
Page<Reservation> reservationPage = reservationRepository.findByUserIdAndStatus(user.getId(), reservationStatus, pageable);
validatePageableWithPage(pageable, reservationPage);
return reservationPage**.map(r -> ReservationResponseDto.of(r, r.getSlot()));
}변경된 코드
@Cacheable(value = "reservations", key = "#user.id + ':' + #status + ':' + #pageable.pageNumber")
public RestPage<ReservationResponseDto> findReservations(Pageable pageable, String status, User user) {
ReservationStatus reservationStatus = ReservationStatus.valueOf(status.toUpperCase());
Page<Reservation> reservationPage = reservationRepository.findByUserIdAndStatus(user.getId(), reservationStatus, pageable);
validatePageableWithPage(pageable, reservationPage);
return new RestPage<>(reservationPage.map(r -> ReservationResponseDto.of(r, r.getSlot())));
}참고
ᴘʜɪʟɪᴘᴘɪᴀɴs 3:14