Algolia_Algoliasearch_Model_Indexer_Algoliacategories::_processEvent PHP Method

    protected function _processEvent(Mage_Index_Model_Event $event)
    {
        if (!$this->config->getApplicationID() || !$this->config->getAPIKey() || !$this->config->getSearchOnlyAPIKey()) {
            if (self::$credential_error === false) {
                /** @var Mage_Adminhtml_Model_Session $session */
                $session = Mage::getSingleton('adminhtml/session');
                $session->addError('Algolia indexing failed: You need to configure your Algolia credentials in System > Configuration > Algolia Search.');
                self::$credential_error = true;
            }
            return;
        }
        $data = $event->getNewData();
        /*
         * Reindex all products and all categories and update index settings
         */
        if (!empty($data['algoliasearch_reindex_all'])) {
            $process = $event->getProcess();
            $process->changeStatus(Mage_Index_Model_Process::STATUS_REQUIRE_REINDEX);
        } else {
            /*
             * Clear indexer for the deleted category including all children categories and update index for the related products.
             */
            if (!empty($data['catalogsearch_delete_category_id'])) {
                $categoryIds = $data['catalogsearch_delete_category_id'];
                $this->engine->removeCategories(null, $categoryIds);
                /*
                 * Change indexer status as need to reindex related products to update the list of categories.
                 * It's low priority so no need to automatically reindex all related products after deleting each category.
                 * Do not reindex all if affected products are given or product count is not indexed.
                 */
                if (!isset($data['catalogsearch_update_product_id'])) {
                    $process = $event->getProcess();
                    $process->changeStatus(Mage_Index_Model_Process::STATUS_REQUIRE_REINDEX);
                }
            }
        }
        /*
         * Reindex categories.
         * Category products are tracked separately. The specified categories are active. See _registerCatalogCategoryEvent().
         */
        if (!empty($data['catalogsearch_update_category_id'])) {
            $this->reindexSpecificCategories($data['catalogsearch_update_category_id']);
        }
        /*
         * If we have added any new products to a category then we need to
         * update these products in Algolia indices.
         */
        if (!empty($data['catalogsearch_update_product_id'])) {
            $this->reindexSpecificProducts($data['catalogsearch_update_product_id']);
        }
    }