code: public boolean touch() {
          if (expireAfterAccess > 0) {
              long now = System.currentTimeMillis();
              if (lastAccessTimestampMs + LAST_ACCESS_THRESHOLD_MS < now) {
                  lastAccessTimestampMs = now;
                  return true;
              }
          }
          return false;
      }
docs: "Touch" the cache entry.
  
  @return
  @since 0.2.1 entry can be touched only if {@code expireAfterAccess > 0}.