Redis를 사용하여 Cache 관리하기
Redis and cache
EhCache 는 thread 내의 cache 전용이여서 분산시스템환경에서 사용하기에는 적합하지 않다. 물론 EhCache 자체도 분산시스템을 지원하지만 캐쉬가 동기화 되지 않는 경우 많다.
아래에 Srpingboot 내부에서 지원한 redis cache 를 설정하고 사용해보자.
동일하게 지난번 사례 코드를 그대로 적용해보자
@Entity
@Data
@NoArgsConstructor
public class User implements Serializable {
@Id
@GeneratedValue
private Long id;
private String name;
private Integer age;
public User(String name, Integer age) {
this.name = name;
this.age = age;
}
}
interface 더 만든다.
@CacheConfig(cacheNames = "users")
public interface UserRepository extends JpaRepository<User, Long> {
@Cacheable
User findByName(String name);
}
pom.xml 에 dependency를 추가한다.
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-pool2</artifactId>
</dependency>
application.properties
spring.redis.host=localhost
spring.redis.port=6379
spring.redis.lettuce.pool.max-idle=8
spring.redis.lettuce.pool.max-active=8
spring.redis.lettuce.pool.max-wait=-1ms
spring.redis.lettuce.pool.min-idle=0
spring.redis.lettuce.shutdown-timeout=100ms
application.yml
spring:
redis:
host: localhost
lettuce:
pool:
max-active: 8
max-idle: 8
max-wait: -1ms
min-idle: 0
shutdown-timeout: 100ms
port: 6379
테스트 코드를 작성
@Slf4j
@RunWith(SpringRunner.class)
@SpringBootTest
public class RedisCacheDemoApplicationTests {
@Autowired
private UserRepository userRepository;
@Autowired
private CacheManager cacheManager;
@Test
public void test() throws Exception {
System.out.println("CacheManager type : " + cacheManager.getClass());
userRepository.save(new User("AAA", 10));
User u1 = userRepository.findByName("AAA");
System.out.println("첫번째 조회 : " + u1.getAge());
User u2 = userRepository.findByName("AAA");
System.out.println("두번째 조회 : " + u2.getAge());
}
}
CacheManager type : class org.springframework.data.redis.cache.RedisCacheManager
Hibernate: select next_val as id_val from hibernate_sequence for update
Hibernate: update hibernate_sequence set next_val= ? where next_val=?
Hibernate: insert into user (age, name, id) values (?, ?, ?)
2020-08-12 16:25:26.954 INFO 68282 --- [ main] io.lettuce.core.EpollProvider : Starting without optional epoll library
2020-08-12 16:25:26.955 INFO 68282 --- [ main] io.lettuce.core.KqueueProvider : Starting without optional kqueue library
Hibernate: select user0_.id as id1_0_, user0_.age as age2_0_, user0_.name as name3_0_ from user user0_ where user0_.name=?
첫번째 조회 : 10
두번째 조회 : 10
로그에서 찍힌 대로
CacheManager type : class org.springframework.data.redis.cache.RedisCacheManager
두번째 조회시 SQL 이 수행되지 않았다.
끝!
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