FrontendPool.php

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<?php
namespace Magento\Framework\App\Cache\Type;

use Magento\Framework\App\Cache\Frontend\Pool;
use Magento\Framework\App\DeploymentConfig;

class FrontendPool
{
    const KEY_CACHE_TYPE = 'type';

    const KEY_FRONTEND_CACHE = 'frontend';

    const KEY_CACHE = 'cache';

    private $_objectManager;

    private $deploymentConfig;

    private $_frontendPool;

    private $_typeFrontendMap;

    private $_instances = [];

    public function __construct(
        \Magento\Framework\ObjectManagerInterface $objectManager,
        \Magento\Framework\App\DeploymentConfig $deploymentConfig,
        \Magento\Framework\App\Cache\Frontend\Pool $frontendPool,
        array $typeFrontendMap = []
    ) {
        $this->_objectManager = $objectManager;
        $this->deploymentConfig = $deploymentConfig;
        $this->_frontendPool = $frontendPool;
        $this->_typeFrontendMap = $typeFrontendMap;
    }

    public function get($cacheType)
    {
        if (!isset($this->_instances[$cacheType])) {
            $frontendId = $this->_getCacheFrontendId($cacheType);
            $frontendInstance = $this->_frontendPool->get($frontendId);
            $frontendInstance = $this->_objectManager->create(
                \Magento\Framework\App\Cache\Type\AccessProxy::class,
                ['frontend' => $frontendInstance, 'identifier' => $cacheType]
            );
            $this->_instances[$cacheType] = $frontendInstance;
        }
        return $this->_instances[$cacheType];
    }

    protected function _getCacheFrontendId($cacheType)
    {
        $result = null;
        $cacheInfo = $this->deploymentConfig->getConfigData(self::KEY_CACHE);
        if (null !== $cacheInfo) {
            $result = isset($cacheInfo[self::KEY_CACHE_TYPE][$cacheType][self::KEY_FRONTEND_CACHE]) ?
                $cacheInfo[self::KEY_CACHE_TYPE][$cacheType][self::KEY_FRONTEND_CACHE] : null;
        }
        if (!$result) {
            if (isset($this->_typeFrontendMap[$cacheType])) {
                $result = $this->_typeFrontendMap[$cacheType];
            } else {
                $result = \Magento\Framework\App\Cache\Frontend\Pool::DEFAULT_FRONTEND_ID;
            }
        }
        return $result;
    }
}