/**
* Get the grade
*
* @param $userId
* @throws \Tk\Exception
* @return float
*/
public function getGrade($userId)
{
$consumer = new \LTI_Tool_Consumer($this->consumerKey, $this->getConfig()->getLtiDataConnector());
$resource = new \LTI_Resource_Link($consumer, $this->resourceId);
$user = new \LTI_User($resource, $userId);
$ltiOutcome = new \LTI_Outcome();
if (!$resource->doOutcomesService(\LTI_Resource_Link::EXT_READ, $ltiOutcome, $user)) {
throw new \Tk\Exception('Error reading from grade-center.');
}
return $ltiOutcome->getValue();
}
