StoreAmount::getStoresCount

public function getStoresCount(): int
{
	if (!isset($this->storesCount))
	{
		$filter = [
			'=PRODUCT_ID' => $this->getVariationIds(),
			[
				'LOGIC' => 'OR',
				'!=AMOUNT' => 0,
				'!=QUANTITY_RESERVED' => 0,
			],
			'=STORE.ACTIVE' => 'Y',
		];

		$filter = array_merge(
			$filter,
			AccessController::getCurrent()->getEntityFilter(
				ActionDictionary::ACTION_STORE_VIEW,
				StoreProductTable::class
			)
		);

		$this->storesCount = StoreProductTable::getList([
			'select' => ['CNT'],
			'filter' => $filter,
			'runtime' => [
				new BitrixMainEntityExpressionField('CNT', 'COUNT(DISTINCT(STORE_ID))')
			],
		])->fetch()['CNT'];
	}

	return $this->storesCount;
}