feat: loadUserByUsername 유저 캐싱 처리

src/main/java/com/techeer/checkIt/domain/user/repository/UserRepository.java

@@ -7,5 +7,6 @@
 
 public interface UserRepository extends JpaRepository<User,Long> {
     boolean existsByUsername(String username);
+
     Optional<User> findUserByUsername(String username);
 }

src/main/java/com/techeer/checkIt/domain/user/service/CustomUserDetailService.java

@@ -6,6 +6,7 @@
 import com.techeer.checkIt.domain.user.repository.UserRepository;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
+import org.springframework.cache.annotation.Cacheable;
 import org.springframework.security.core.userdetails.UserDetails;
 import org.springframework.security.core.userdetails.UserDetailsService;
 import org.springframework.security.core.userdetails.UsernameNotFoundException;
@@ -19,6 +20,7 @@ public class CustomUserDetailService implements UserDetailsService {
     private final UserRepository userRepository;
 
     @Override
+    @Cacheable("users")
     public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
         log.info("loadUserByUsername called for username: {}", username);
         User principal = userRepository.findUserByUsername(username)

src/main/java/com/techeer/checkIt/global/config/CacheConfig.java

@@ -0,0 +1,16 @@
+package com.techeer.checkIt.global.config;
+
+import org.springframework.cache.CacheManager;
+import org.springframework.cache.annotation.EnableCaching;
+import org.springframework.cache.concurrent.ConcurrentMapCacheManager;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@EnableCaching
+public class CacheConfig {
+    @Bean
+    public CacheManager cacheManager() {
+        return new ConcurrentMapCacheManager("users");
+    }
+}

src/main/java/com/techeer/checkIt/global/config/JpaAuditingConfig.java

@@ -1,6 +1,5 @@
 package com.techeer.checkIt.global.config;
 
-import com.techeer.checkIt.domain.book.repository.BookJpaRepository;
 import com.techeer.checkIt.domain.book.repository.BookSearchRepository;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.Configuration;