Task::setPosition

public function setPosition(string $position): self
{
	if (
		$position !== static::ACTUALIZATION_POSITION_QUEUE
		&& $position !== static::ACTUALIZATION_POSITION_BACKGROUND
		&& $position !== static::ACTUALIZATION_POSITION_IMMEDIATELY
	)
	{
		throw new ArgumentOutOfRangeException('position');
	}

	$this->position = $position;

	return $this;
}