Identifier.php

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<?php
namespace Magento\Customer\CustomerData\Section;

class Identifier
{
    const COOKIE_KEY = 'storage_data_id';

    const SECTION_KEY = 'data_id';

    const UPDATE_MARK = 'sections_updated';

    protected $markId;

    protected $cookieManager;

    protected $sessionConfig;

    public function __construct(
        \Magento\Framework\Stdlib\Cookie\PhpCookieManager $cookieManager
    ) {
        $this->cookieManager = $cookieManager;
    }

    public function initMark($forceUpdate)
    {
        if ($forceUpdate) {
            $this->markId = time();
            return $this->markId;
        }

        $cookieMarkId = false;
        if (!$this->markId) {
            $cookieMarkId = $this->cookieManager->getCookie(self::COOKIE_KEY);
        }

        $this->markId = $cookieMarkId ? $cookieMarkId : time();

        return $this->markId;
    }

    public function markSections(array $sectionsData, $sectionNames = null, $updateIds = false)
    {
        if (!$sectionNames) {
            $sectionNames = array_keys($sectionsData);
        }
        $markId = $this->initMark($updateIds);

        foreach ($sectionNames as $name) {
            if ($updateIds || !array_key_exists(self::SECTION_KEY, $sectionsData[$name])) {
                $sectionsData[$name][self::SECTION_KEY] = $markId;
            }
        }
        return $sectionsData;
    }
}