SaveHandler.php

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<?php
namespace Magento\Framework\Session;

use Magento\Framework\Session\Config\ConfigInterface;
use \Magento\Framework\Exception\SessionException;

class SaveHandler implements SaveHandlerInterface
{
    protected $saveHandlerAdapter;

    public function __construct(
        SaveHandlerFactory $saveHandlerFactory,
        ConfigInterface $sessionConfig,
        $default = self::DEFAULT_HANDLER
    ) {
        $saveMethod = $sessionConfig->getOption('session.save_handler') ?: $default;

        try {
            $this->saveHandlerAdapter = $saveHandlerFactory->create($saveMethod);
        } catch (SessionException $e) {
            $this->saveHandlerAdapter = $saveHandlerFactory->create($default);
        }
    }

    public function open($savePath, $name)
    {
        return $this->saveHandlerAdapter->open($savePath, $name);
    }

    public function close()
    {
        return $this->saveHandlerAdapter->close();
    }

    public function read($sessionId)
    {
        return $this->saveHandlerAdapter->read($sessionId);
    }

    public function write($sessionId, $data)
    {
        return $this->saveHandlerAdapter->write($sessionId, $data);
    }

    public function destroy($sessionId)
    {
        return $this->saveHandlerAdapter->destroy($sessionId);
    }

    public function gc($maxLifetime)
    {
        return $this->saveHandlerAdapter->gc($maxLifetime);
    }
}