code: private QuotaValue getQuotaValue(final CacheKey key) throws UnknownQuotaLimitException
     {
        QuotaValue quotaValue = SecurityHelper.doPrivilegedAction(new PrivilegedAction<QuotaValue>()
        {
           public QuotaValue run()
           {
              return (QuotaValue)cache.withFlags(Flag.FORCE_WRITE_LOCK).get(key);
           }
        });
        if (quotaValue == null)
        {
           throw new UnknownQuotaLimitException("Quota was not set early");
        }
  
        return quotaValue;
     }
docs: Returns {@link QuotaValue} otherwise throws {@link UnknownQuotaLimitException}.