FlushAll.php

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<?php
namespace Magento\Backend\Controller\Adminhtml\Cache;

use Magento\Framework\App\Action\HttpGetActionInterface as HttpGetActionInterface;

class FlushAll extends \Magento\Backend\Controller\Adminhtml\Cache implements HttpGetActionInterface
{
    const ADMIN_RESOURCE = 'Magento_Backend::flush_cache_storage';

    public function execute()
    {
        $this->_eventManager->dispatch('adminhtml_cache_flush_all');
        foreach ($this->_cacheFrontendPool as $cacheFrontend) {
            $cacheFrontend->getBackend()->clean();
        }
        $this->messageManager->addSuccessMessage(__("You flushed the cache storage."));
        $resultRedirect = $this->resultRedirectFactory->create();
        return $resultRedirect->setPath('adminhtml/*');
    }
}