SaveHandlerFactory.php

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<?php
namespace Magento\Framework\Session;

class SaveHandlerFactory
{
    const PHP_NATIVE_HANDLER = \Magento\Framework\Session\SaveHandler\Native::class;

    protected $objectManager;

    protected $handlers = [];

    public function __construct(\Magento\Framework\ObjectManagerInterface $objectManger, array $handlers = [])
    {
        $this->objectManager = $objectManger;
        if (!empty($handlers)) {
            $this->handlers = array_merge($handlers, $this->handlers);
        }
    }

    public function create($saveMethod, $params = [])
    {
        $sessionHandler = self::PHP_NATIVE_HANDLER;
        if (isset($this->handlers[$saveMethod])) {
            $sessionHandler = $this->handlers[$saveMethod];
        }

        $model = $this->objectManager->create($sessionHandler, $params);
        if (!$model instanceof \SessionHandlerInterface) {
            throw new \LogicException($sessionHandler . ' doesn\'t implement \SessionHandlerInterface');
        }

        return $model;
    }
}