QueueController.php

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<?php
namespace OliverHader\IrreTutorial\Controller;

class QueueController extends AbstractController {

    protected $contentRepository;

    protected $defaultViewObjectName = 'TYPO3\\CMS\\Extbase\\Mvc\\View\\JsonView';

    public function indexAction() {
        $calls = array();
        $calls[] = array('Content', 'list');
        $contents = $this->contentRepository->findAll();
        foreach ($contents as $content) {
            $uid = $content->getUid();
            $calls[] = array('Content', 'show', array('content' => (string)$uid));
        }
        $this->getQueueService()->set($calls);
        $this->forward('process');
    }

    public function processAction() {
        $call = $this->getQueueService()->shift();
        if ($call === NULL) {
            $this->forward('finish');
        }
        // Clear these states and fetch fresh entities!
        $this->getPersistenceManager()->clearState();
        $this->forward($call[1], $call[0], NULL, isset($call[2]) ? $call[2] : NULL);
    }

    public function finishAction() {
        $this->request->setDispatched(TRUE);
        $value = $this->getQueueService()->getValues();
        $this->view->assign('value', $value);
    }

    protected function resolveController(\TYPO3\CMS\Extbase\Mvc\RequestInterface $request) {
        $controllerObjectName = $request->getControllerObjectName();
        $controller = $this->objectManager->get($controllerObjectName);
        if (!$controller instanceof \TYPO3\CMS\Extbase\Mvc\Controller\ControllerInterface) {
            throw new \TYPO3\CMS\Extbase\Mvc\Exception\InvalidControllerException('Invalid controller "' . $request->getControllerObjectName() . '". The controller must implement the TYPO3\\CMS\\Extbase\\Mvc\\Controller\\ControllerInterface.', 1202921619);
        }
        return $controller;
    }

}