abstractimservice.php

См. документацию.

<?php
 
namespace Bitrix\Calendar\Integration\Im;
 
use Bitrix\Main\Loader;
use Bitrix\Main\LoaderException;
use Bitrix\Main\NotSupportedException;
 
abstract class AbstractImService
{
    final protected function __construct()
    {
        if (!Loader::includeModule('im'))
        {
            throw new NotSupportedException('IM module is not installed');
        }
    }
}