How to use processors with custom databases?

$corePath = $modx->getOption('psyab.core_path',null,$modx->getOption('core_path').'components/psyab/');

require_once $corePath.'model/psyAb/psyab.class.php';

$modx->addPackage('psyAb',$corePath.'model/');
$modx->psyab = new psyAb($modx);

$modx->lexicon->load('psyab:default');
//echo $modx->lexicon('desc');
/* handle request */
$path = $modx->getOption('processorsPath',$modx->psyab->config,$corePath.'processors/');
$modx->request->handleRequest(array(
    'processors_path' => $path,
    'location' => '',
));

$xpdo = new xPDO('mysql:host=localhost;dbname=dbname', 'login', 'pass', 'prefix_');

$modx->addPackage('psyAb',$corePath.'model/');

$modx->addPackage('psyAb',$corePath.'model/', 'prefix_');

public function connect () {
   return new xPDO('mysql:host=localhost;dbname=dbname', 'login', 'pass', 'prefix_');
}

$corePath = $modx->getOption('psyab.core_path',null,$modx->getOption('core_path').'components/psyab/');
 
require_once $corePath.'model/psyAb/psyab.class.php';
 
$modx->addPackage('psyAb',$corePath.'model/');
$modx->psyab = new psyAb($modx);
$modx->psyab->data = $modx->psyab->connect(); // just an example
 
$modx->lexicon->load('psyab:default');
//echo $modx->lexicon('desc');
/* handle request */
$path = $modx->getOption('processorsPath',$modx->psyab->config,$corePath.'processors/');
$modx->request->handleRequest(array(
    'processors_path' => $path,
    'location' => '',
));

class JournalGetListProcessor extends modObjectGetListProcessor {
    public $classKey = 'Journal';
    public $languageTopics = array('psyab:default');
    public $defaultSortField = 'title';
    public $defaultSortDirection = 'ASC';
    public $objectType = 'psyab.journal';
}

<?php

class JournalGetListProcessor extends modObjectGetListProcessor {

    public $classKey = 'Journal';
    public $languageTopics = array('psyab:default');
    public $defaultSortField = 'title';
    public $defaultSortDirection = 'ASC';
    public $objectType = 'psyab.journal';

    /**
     * ///////////// You are overriding this method! ///////////////
     *
     * Get the data of the query
     * @return array
     */
    public function getData() {
        $data = array();
        $limit = intval($this->getProperty('limit'));
        $start = intval($this->getProperty('start'));

        $c = $this->modx->psyab->data->newQuery($this->classKey);
        $c = $this->prepareQueryBeforeCount($c);
        $data['total'] = $this->modx->psyab->data->getCount($this->classKey, $c);
        $c = $this->prepareQueryAfterCount($c);

        $sortClassKey = $this->getSortClassKey();
        $sortKey = $this->modx->psyab->data->getSelectColumns($sortClassKey, $this->getProperty('sortAlias', $sortClassKey), '', array($this->getProperty('sort')));
        if (empty($sortKey))
            $sortKey = $this->getProperty('sort');
        $c->sortby($sortKey, $this->getProperty('dir'));
        if ($limit > 0) {
            $c->limit($limit, $start);
        }

        $data['results'] = $this->modx->psyab->data->getCollection($this->classKey, $c);
        return $data;
    }

}

return 'JournalGetListProcessor';