Storage.php

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<?php
namespace Magento\Framework\Session;

class Storage extends \Magento\Framework\DataObject implements StorageInterface
{
    protected $namespace;

    public function __construct($namespace = 'default', array $data = [])
    {
        $this->namespace = $namespace;
        parent::__construct($data);
    }

    public function init(array $data)
    {
        $namespace = $this->getNamespace();
        if (isset($data[$namespace])) {
            $this->setData($data[$namespace]);
        }
        $_SESSION[$namespace] = & $this->_data;
    }

    public function getNamespace()
    {
        return $this->namespace;
    }

    public function getData($key = '', $clear = false)
    {
        $data = parent::getData($key);
        if ($clear && isset($this->_data[$key])) {
            unset($this->_data[$key]);
        }
        return $data;
    }
}