entityfabric.php

См. документацию.

<?php
namespace Bitrix\Forum\Internals;
use \Bitrix\Main;
trait EntityFabric
{
    protected static $repo = [];

    public static function getById($id)
    {
        if (!array_key_exists(__CLASS__, self::$repo))
        {
            self::$repo[__CLASS__] = [];
        }
        $id = intval($id);
        if (!array_key_exists($id, self::$repo[__CLASS__]))
        {
            try
            {
                self::$repo[__CLASS__][$id] = new static($id);
            }
            catch (Main\ObjectNotFoundException $exception)
            {
                return null;
            }
        }
        return self::$repo[__CLASS__][$id];
    }
 
    public function destroy()
    {
        if (array_key_exists(__CLASS__, self::$repo))
        {
            foreach (self::$repo[__CLASS__] as $key => $object)
            {
                if ($object === $this)
                {
                    unset(self::$repo[__CLASS__][$key]);
// AddMessage2Log("Object: ".__CLASS__." $key were destroyed.");
                    return;
                }
            }
        }
    }

    public static function getInstance($object)
    {
        if ($object instanceof static)
        {
            return $object;
        }
        return static::getById($object);
    }
}