HandlerPool.php

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<?php
namespace Magento\Framework\Indexer;

use Magento\Framework\Indexer\Handler\DefaultHandler;
use Magento\Framework\ObjectManagerInterface;

class HandlerPool
{
    protected $objectManager;

    protected $defaultHandler;

    public function __construct(
        ObjectManagerInterface $objectManager,
        DefaultHandler $defaultHandler
    ) {
        $this->defaultHandler = $defaultHandler;
        $this->objectManager = $objectManager;
    }

    public function get($handlerClass = null)
    {
        if ($handlerClass === null) {
            return $this->defaultHandler;
        }

        $handler = $this->objectManager->get($handlerClass);
        if (!$handler instanceof HandlerInterface) {
            throw new \InvalidArgumentException(
                $handlerClass . ' doesn\'t implement \Magento\Framework\Indexer\HandlerInterface'
            );
        }

        return $handler;
    }
}