code: private long getQuota(CacheKey key) throws UnknownQuotaLimitException
     {
        Long size = (Long)cache.withFlags(Flag.FORCE_WRITE_LOCK).get(key);
  
        if (size == null)
        {
           throw new UnknownQuotaLimitException("Quota was not set early");
        }
  
        return size;
     }
docs: Returns quota limit value otherwise throws {@link UnknownQuotaLimitException}.