feat: cache config 구현 (#3)

build.gradle

@@ -70,6 +70,10 @@ dependencies {
 
     // Spring Security
     implementation 'org.springframework.boot:spring-boot-starter-security'
+
+    // Caffeine Cache
+    implementation 'org.springframework.boot:spring-boot-starter-cache'
+    implementation 'com.github.ben-manes.caffeine:caffeine'
 }
 
 tasks.named('test') {

src/main/java/com/acon/server/global/auth/CacheConfig.java

@@ -0,0 +1,38 @@
+package com.acon.server.global.auth;
+
+
+import com.github.benmanes.caffeine.cache.Caffeine;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.cache.CacheManager;
+import org.springframework.cache.annotation.EnableCaching;
+import org.springframework.cache.caffeine.CaffeineCache;
+import org.springframework.cache.support.SimpleCacheManager;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import java.util.Collections;
+import java.util.concurrent.TimeUnit;
+
+@Configuration
+@EnableCaching
+public class CacheConfig {
+    @Value("${jwt.refresh-token-expire-time}")
+    private long REFRESH_TOKEN_EXPIRATION_TIME;
+
+    @Bean
+    public CacheManager cacheManager() {
+
+        // 최대 용량 설정을 따로 진행하지 않음. 메모리 부족 문제 주의 필요
+        Caffeine<Object, Object> caffeineBuilder = Caffeine.newBuilder()
+                .expireAfterWrite(REFRESH_TOKEN_EXPIRATION_TIME, TimeUnit.MILLISECONDS);
+
+        CaffeineCache refreshTokenCache = new CaffeineCache(
+                "refreshTokenCache",
+                caffeineBuilder.build()
+        );
+
+        SimpleCacheManager cacheManager = new SimpleCacheManager();
+        cacheManager.setCaches(Collections.singletonList(refreshTokenCache));
+        return cacheManager;
+    }
+}