Block::execute

public function execute(array &$result)
{
	$finished = true;

	// check queue
	$res = UpdateBlock::getList([
		'select' => [
			'ID', 'CODE', 'LAST_BLOCK_ID', 'PARAMS'
		],
		'order' => [
			'ID' => 'asc'
		],
		'limit' => 1
	]);
	if (!($rowUpdate = $res->fetch()))
	{
		return false;
	}

	// gets common quantity
	$res = BlockTable::getList([
		'select' => [
			new BitrixMainEntityExpressionField(
				'CNT', 'COUNT(*)'
			)
		],
		'filter' => [
			'=CODE' => $rowUpdate['CODE'],
			'!=DESIGNED' => 'Y',
		]
	]);

	// skip blocks that not exists
	$row = $res->fetch();
	if(!$row || (int) $row['CNT'] === 0)
	{
		UpdateBlock::delete(
			$rowUpdate['ID']
		);
		return $this->execute($result);
	}
	$result['count'] = $row['CNT'];

	// gets finished count
	$res = BlockTable::getList([
		'select' => [
			new BitrixMainEntityExpressionField(
				'CNT', 'COUNT(*)'
			)
		],
		'filter' => [
			'<=ID' => $rowUpdate['LAST_BLOCK_ID'],
			'=CODE' => $rowUpdate['CODE'],
			'!=DESIGNED' => 'Y',
		]
		]
	);
	if ($row = $res->fetch())
	{
		$result['steps'] = $row['CNT'];
	}

	// gets block group for update
	$lastId = $this::executeStep([
			'>ID' => $rowUpdate['LAST_BLOCK_ID'],
			'=CODE' => $rowUpdate['CODE'],
			'!=DESIGNED' => 'Y',
		],
	 	$count,
	 	$this::STEPPER_COUNT,
	 	$rowUpdate['PARAMS']
	);
	if ($lastId > 0)
	{
		$finished = false;
	}

	// finish or continue
	if (!$finished)
	{
		UpdateBlock::update($rowUpdate['ID'], [
			'LAST_BLOCK_ID' => $lastId
		]);
		return true;
	}
	else
	{
		UpdateBlock::delete($rowUpdate['ID']);
		return true;//for check next item in UpdateBlock
	}
}