eZ\Publish\Core\SignalSlot\Repository::getUserService PHP Method

    public function getUserService()
    {
        if ($this->userService !== null) {
            return $this->userService;
        }
        $this->userService = new UserService($this->repository->getUserService(), $this->signalDispatcher);
        return $this->userService;
    }

 /**
  * Permite definir el usuario actual
  * @param integer $user_id id del usuario a definir
  */
 protected function setCurrentUser($user_id)
 {
     $this->currentUser = $this->repository->getUserService()->loadUser($user_id);
     $this->repository->setCurrentUser($this->currentUser);
     return $this;
 }