ConfigurationPool.php

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<?php
namespace Magento\Catalog\Helper\Product;

class ConfigurationPool
{
    protected $_objectManager;

    private $_instances = [];

    private $instancesByType = [];

    public function __construct(\Magento\Framework\ObjectManagerInterface $objectManager, array $instancesByType)
    {
        $this->_objectManager = $objectManager;
        $this->instancesByType = $instancesByType;
    }

    public function get($className)
    {
        if (!isset($this->_instances[$className])) {
            $helperInstance = $this->_objectManager->get($className);
            if (false ===
                $helperInstance instanceof \Magento\Catalog\Helper\Product\Configuration\ConfigurationInterface
            ) {
                throw new \LogicException(
                    "{$className} doesn't implement " .
                    \Magento\Catalog\Helper\Product\Configuration\ConfigurationInterface::class
                );
            }
            $this->_instances[$className] = $helperInstance;
        }
        return $this->_instances[$className];
    }

    public function getByProductType($productType)
    {
        if (!isset($this->instancesByType[$productType])) {
            return $this->instancesByType['default'];
        }
        return $this->instancesByType[$productType];
    }
}