TypoScriptFrontendHook.php

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<?php
namespace TYPO3\CMS\IndexedSearch\Hook;

class TypoScriptFrontendHook {

    public function headerNoCache(array &$params, $ref) {
        // Requirements are that the crawler is loaded, a crawler session is running and re-indexing requested as processing instruction:
        if (\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::isLoaded('crawler') && $params['pObj']->applicationData['tx_crawler']['running'] && in_array('tx_indexedsearch_reindex', $params['pObj']->applicationData['tx_crawler']['parameters']['procInstructions'])) {
            // Setting simple log entry:
            $params['pObj']->applicationData['tx_crawler']['log'][] = 'RE_CACHE (indexed), old status: ' . $params['disableAcquireCacheData'];
            // Disables a look-up for cached page data - thus resulting in re-generation of the page even if cached.
            $params['disableAcquireCacheData'] = TRUE;
        }
    }

}