/**
  * Loads the class from the given file and stores the path into cache.
  * @param string $file Full path to the file
  * @param string $class Full name of the class
  * @return bool Always returns true
  * @throws \RuntimeException If the class was not defined in the included file
  */
 protected function loadFile($file, $class)
 {
     parent::loadFile($file, $class);
     $this->cache[$class] = $file;
     $this->saveCache();
     return true;
 }