CleanCache.php

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<?php
namespace Magento\Indexer\Model\Processor;

use \Magento\Framework\App\CacheInterface;

class CleanCache
{
    protected $context;

    protected $eventManager;

    private $cache;

    public function __construct(
        \Magento\Framework\Indexer\CacheContext $context,
        \Magento\Framework\Event\Manager $eventManager
    ) {
        $this->context = $context;
        $this->eventManager = $eventManager;
    }

    public function afterUpdateMview(\Magento\Indexer\Model\Processor $subject)
    {
        $this->eventManager->dispatch('clean_cache_after_reindex', ['object' => $this->context]);
        if (!empty($this->context->getIdentities())) {
            $this->getCache()->clean($this->context->getIdentities());
        }
    }

    public function afterReindexAllInvalid(\Magento\Indexer\Model\Processor $subject)
    {
        $this->eventManager->dispatch('clean_cache_by_tags', ['object' => $this->context]);
        if (!empty($this->context->getIdentities())) {
            $this->getCache()->clean($this->context->getIdentities());
        }
    }

    private function getCache()
    {
        if ($this->cache === null) {
            $this->cache = \Magento\Framework\App\ObjectManager::getInstance()->get(CacheInterface::class);
        }
        return $this->cache;
    }
}