FlushAllCacheObserver.php

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<?php
namespace Magento\CacheInvalidate\Observer;

use Magento\Framework\Event\ObserverInterface;

class FlushAllCacheObserver implements ObserverInterface
{
    protected $config;

    protected $purgeCache;

    public function __construct(
        \Magento\PageCache\Model\Config $config,
        \Magento\CacheInvalidate\Model\PurgeCache $purgeCache
    ) {
        $this->config = $config;
        $this->purgeCache = $purgeCache;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        if ($this->config->getType() == \Magento\PageCache\Model\Config::VARNISH && $this->config->isEnabled()) {
            $this->purgeCache->sendPurgeRequest('.*');
        }
    }
}