CacheContext.php

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<?php
namespace Magento\Framework\Indexer;

class CacheContext implements \Magento\Framework\DataObject\IdentityInterface
{
    protected $entities = [];

    private $tags = [];

    public function registerEntities($cacheTag, $ids)
    {
        $this->entities[$cacheTag] = array_merge($this->getRegisteredEntity($cacheTag), $ids);
        return $this;
    }

    public function registerTags($cacheTags)
    {
        $this->tags = array_merge($this->tags, $cacheTags);
        return $this;
    }

    public function getRegisteredEntity($cacheTag)
    {
        if (empty($this->entities[$cacheTag])) {
            return [];
        } else {
            return $this->entities[$cacheTag];
        }
    }

    public function getIdentities()
    {
        $identities = [];
        foreach ($this->entities as $cacheTag => $ids) {
            foreach ($ids as $id) {
                $identities[] = $cacheTag . '_' . $id;
            }
        }
        return array_merge($identities, array_unique($this->tags));
    }
}