docs: public boolean isModified(String fileName)
      {
          if ((lastTimeDiskWasAccessed + reloadMillis) > System.currentTimeMillis())
          {
              return false;
          }
          lastTimeDiskWasAccessed = System.currentTimeMillis();
          CacheEntry cacheEntry = (CacheEntry) cache.get(fileName);
          if (cacheEntry != null)
          {
               return cacheEntry.isModified();
          }
          else
          {
              return true;
          }
      }