code: public String getPerformanceStats() {
          int total = totalQuery.get();
          int hit = cacheHit.get();
          int weakRef = weakRefLost.get();
          int failure = loadFailure.get();
          int miss = total-hit-weakRef;
  
          return MessageFormat.format("total={0} hit={1}% lostRef={2}% failure={3}% miss={4}%",
                  total,hit,weakRef,failure,miss);
      }
docs: Gets the short summary of performance statistics.