Use Of Notifiers - How To

[mesnitu]

Auto load notifier:
I had this working loading the config. and init_ files. But since init_canonical it loaded at point 161 and this autoload at 175, would be 2 less files.
However, I'm not getting this right.
I've also tried to use function updateNotifyInitCanonicalParamWhitelist(&$class, $eventID,$paramsArray = array()), but that would be for the update function (?)


two more files , two less files is not the issue, but I would like to understand how this works.

class zcObserverBookxCanonical extends base
{

    public function __construct()
    {
        
        $this->attach($this, array(
            'NOTIFY_INIT_CANONICAL_PARAM_WHITELIST',
            'NOTIFY_INIT_CANONICAL_DEFAULT'));  
    }
   

    //$zco_notifier->notify ('NOTIFY_INIT_CANONICAL_PARAM_WHITELIST', $current_page, $excludeParams, $keepableParams, $includeCPath);
      
    function updateNotifyInitCanonicalParamWhitelist(&$class, $eventID, $current_page, &$excludeParams, &$keepableParams, $includeCPath)
    {
        
        global $keepableParams; // ??
        pr($keepableParams, '$paramsArray');
        $keepableParams[] = 'bookx_publisher_id';
        $keepableParams[] = 'bookx_genre_id';
        $keepableParams[] = 'bookx_author_id';
        $keepableParams[] = 'bookx_author_type_id';
        $keepableParams[] = 'bookx_author_type_id';
        $keepableParams[] = 'bookx_imprint_id';
        $keepableParams[] = 'bookx_series_id';
    } 

thanks