/**
  * @see xfEngine
  */
 public function open()
 {
     $this->engine->open();
 }
 /**
  * @see xfIndex
  */
 public final function find(xfCriterion $crit)
 {
     $this->setup();
     $this->engine->open();
     return new xfResultIterator($this->engine->find($crit), $this->getServiceRegistry());
 }