public class LikeService {

    @Cacheable(cacheNames = "likeUserNames", key = "#postId")
    public List<String> getLikeUserNames(String postId) {
        // ...
    }

    @Cacheable(cacheNames = "likeCount", key = "#postId")
    public long getLikeCount(String postId) {
        // ...
    }
    // ...
}