I want to know there is a better way to do it
I want to restrict a page to only logged in users.
Finally I am using below code, which works to me

class ProfilePage_Controller extends Page_Controller {
 public function init()
	{
		
		parent::init();
                $member = Member::currentUser();
		if(!$member) Security::permissionFailure(); 
    }
}

public funciton canView(){return Member::currentUserID();}

Or if it's a SiteTree page (which it looks like it is) just set it as such in the CMS (Access tab).

public function canView(){return Member::currentUserID();}

Thanks