/**
* Use a static cache to try and reduce DB calls.
*
* @param int $userid The user id for this submission
* @param int $group The groupid (returned)
* @param stdClass|false $submission The stdClass submission or false (returned)
* @param int $attemptnumber Return a specific attempt number (-1 for latest)
*/
protected function get_group_and_submission($userid, &$group, &$submission, $attemptnumber)
{
$group = false;
if (isset($this->submissiongroups[$userid])) {
$group = $this->submissiongroups[$userid];
} else {
$group = $this->setaskment->get_submission_group($userid, false);
$this->submissiongroups[$userid] = $group;
}
$groupid = 0;
if ($group) {
$groupid = $group->id;
}
// Static cache is keyed by groupid and attemptnumber.
// We may need both the latest and previous attempt in the same page.
if (isset($this->groupsubmissions[$groupid . ':' . $attemptnumber])) {
$submission = $this->groupsubmissions[$groupid . ':' . $attemptnumber];
} else {
$submission = $this->setaskment->get_group_submission($userid, $groupid, false, $attemptnumber);
$this->groupsubmissions[$groupid . ':' . $attemptnumber] = $submission;
}
}