protected final function loadRunningDaemons()
 {
     $daemons = array();
     $pid_dir = $this->getPIDDirectory();
     $pid_files = Filesystem::listDirectory($pid_dir);
     foreach ($pid_files as $pid_file) {
         $daemons[] = PhabricatorDaemonReference::newFromFile($pid_dir . '/' . $pid_file);
     }
     return $daemons;
 }