Logger.php

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<?php
declare(strict_types=1);

namespace Magento\ReleaseNotification\Model\ResourceModel\Viewer;

use Magento\ReleaseNotification\Model\Viewer\Log;
use Magento\ReleaseNotification\Model\Viewer\LogFactory;
use Magento\Framework\App\ResourceConnection;

class Logger
{
    const LOG_TABLE_NAME = 'release_notification_viewer_log';

    private $resource;

    private $logFactory;

    public function __construct(
        ResourceConnection $resource,
        LogFactory $logFactory
    ) {
        $this->resource = $resource;
        $this->logFactory = $logFactory;
    }

    public function log(int $viewerId, string $lastViewVersion) : bool
    {
        $connection = $this->resource->getConnection(ResourceConnection::DEFAULT_CONNECTION);
        $connection->insertOnDuplicate(
            $this->resource->getTableName(self::LOG_TABLE_NAME),
            [
                'viewer_id' => $viewerId,
                'last_view_version' => $lastViewVersion
            ],
            [
                'last_view_version'
            ]
        );
        return true;
    }

    public function get(int $viewerId) : Log
    {
        return $this->logFactory->create(['data' => $this->loadLogData($viewerId)]);
    }

    private function loadLogData(int $viewerId) : array
    {
        $connection = $this->resource->getConnection();
        $select = $connection->select()
            ->from($this->resource->getTableName(self::LOG_TABLE_NAME))
            ->where('viewer_id = ?', $viewerId);

        $data = $connection->fetchRow($select);
        if (!$data) {
            $data = [];
        }
        return $data;
    }
}