CleanImages.php

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

use Magento\Framework\App\Action\HttpGetActionInterface as HttpGetActionInterface;
use Magento\Framework\Exception\LocalizedException;
use Magento\Framework\Controller\ResultFactory;

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

    public function execute()
    {
        try {
            $this->_objectManager->create(\Magento\Catalog\Model\Product\Image::class)->clearCache();
            $this->_eventManager->dispatch('clean_catalog_images_cache_after');
            $this->messageManager->addSuccessMessage(__('The image cache was cleaned.'));
        } catch (LocalizedException $e) {
            $this->messageManager->addErrorMessage($e->getMessage());
        } catch (\Exception $e) {
            $this->messageManager->addExceptionMessage($e, __('An error occurred while clearing the image cache.'));
        }

        $resultRedirect = $this->resultFactory->create(ResultFactory::TYPE_REDIRECT);
        return $resultRedirect->setPath('adminhtml/*');
    }
}