Base::getInstanceDirect

static function getInstanceDirect($className)
{
	if (empty(self::$instances[$className]))
	{
		/** @var Base $entity */
		$entity = new static;
		$entity->initialize($className);
		$entity->postInitialize();

		// call user-defined postInitialize
		$className::postInitialize($entity);

		self::$instances[$className] = $entity;
	}

	return self::$instances[$className];
}