guava.cache

com.google.common.cache.CacheBuilder;

private LoadingCache<String, Object> blackListCache = CacheBuilder.newBuilder().maximumSize(100).expireAfterWrite(120, TimeUnit.SECONDS).refreshAfterWrite(60, TimeUnit.SECONDS).build(new CacheLoader<String, Object>(){
            @Override
            public Object load(String key) throws Exception
            {
                if("blackList".equals(key)){
                    return blacklistDao.getBlacklistByModule(BLACKLIST_MODULE);
                }
                return null;
            }
        });