feat(#156): cacheConfig 설정

- cache를 사용하기 위해서 config설정을 하였습니다.

src/main/java/com/insert/ioj/global/config/CacheConfig.java

@@ -0,0 +1,44 @@
+package com.insert.ioj.global.config;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.SerializationFeature;
+import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
+import org.springframework.cache.CacheManager;
+import org.springframework.cache.annotation.EnableCaching;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.redis.cache.RedisCacheConfiguration;
+import org.springframework.data.redis.cache.RedisCacheManager;
+import org.springframework.data.redis.connection.RedisConnectionFactory;
+import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;
+import org.springframework.data.redis.serializer.RedisSerializationContext;
+import org.springframework.data.redis.serializer.StringRedisSerializer;
+
+import java.time.Duration;
+
+@Configuration
+@EnableCaching
+public class CacheConfig {
+    @Bean
+    public CacheManager cacheManager(RedisConnectionFactory redisConnectionFactory) {
+        ObjectMapper objectMapper = new ObjectMapper();
+        objectMapper.registerModule(new JavaTimeModule());
+        objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
+
+        GenericJackson2JsonRedisSerializer redisSerializer = new GenericJackson2JsonRedisSerializer(objectMapper);
+
+        RedisCacheConfiguration cacheConfiguration = RedisCacheConfiguration.defaultCacheConfig()
+            .entryTtl(Duration.ofHours(3))
+            .disableCachingNullValues()
+            .serializeKeysWith(
+                RedisSerializationContext.SerializationPair.fromSerializer(new StringRedisSerializer())
+            )
+            .serializeValuesWith(
+                RedisSerializationContext.SerializationPair.fromSerializer(redisSerializer)
+            );
+
+        return RedisCacheManager.builder(redisConnectionFactory)
+            .cacheDefaults(cacheConfiguration)
+            .build();
+    }
+}