SingletonTrait.php

См. документацию.

<?php
 
declare(strict_types=1);
 
namespace Bitrix\Im\V2\Common;
 
use RuntimeException;
 
trait SingletonTrait
{
    protected static ?self $instance = null;
 
    public static function getInstance(): static
    {
        if (static::$instance === null)
        {
            static::$instance = new static();
        }
 
        return static::$instance;
    }
 
    private function __construct()
    {
    }
 
    public function __clone()
    {
        throw new RuntimeException('Cannot clone a singleton');
    }
 
    public function __wakeup()
    {
        throw new RuntimeException('Cannot wake up a singleton');
    }
}