Java goole.common.cache.Cache 사용하기.

private Cache<String, Dto> cached = CacheBuilder.newBuilder().maximumSize(CACHE_SIZE).expireAfterAccess(
   EXPIRE_IN_MINUTE, TimeUnit.MINUTES).build();
    private Dto getDtoByCache(final String id) {
      return cached.get(id, new Callable<Dto>() {
         @Override public Dto call() throws Exception {
            return target.getDtoById(id);
         }
      });
   }