class.ilTestSessionFactory.php

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<?php

declare(strict_types=1);

class ilTestSessionFactory
{
    private $testSession = [];

    public function __construct(
        private ilObjTest $test_obj,
        private ilDBInterface $db,
        private ilObjUser $user
    ) {
    }

    public function reset(): void
    {
        $this->testSession = [];
    }

    public function getSession(?int $active_id = null): ilTestSession
    {
        if ($active_id === null ||
            $this->testSession === [] ||
            !array_key_exists($active_id, $this->testSession) ||
            $this->testSession[$active_id] === null
        ) {
            $testSession = $this->getNewTestSessionObject();

            $testSession->setRefId($this->test_obj->getRefId());
            $testSession->setTestId($this->test_obj->getTestId());

            if ($active_id) {
                $testSession->loadFromDb($active_id);
                $this->testSession[$active_id] = $testSession;
            } else {
                $testSession->loadTestSession(
                    $this->test_obj->getTestId(),
                    $this->user->getId(),
                    $testSession->getAccessCodeFromSession()
                );

                return $testSession;
            }
        }

        return $this->testSession[$active_id];
    }

    public function getSessionByUserId(int $user_id): ilTestSession
    {
        if (!isset($this->testSession[$this->buildCacheKey($user_id)])) {
            $testSession = $this->getNewTestSessionObject();

            $testSession->setRefId($this->test_obj->getRefId());
            $testSession->setTestId($this->test_obj->getTestId());

            $testSession->loadTestSession($this->test_obj->getTestId(), $user_id);

            $this->testSession[$this->buildCacheKey($user_id)] = $testSession;
        }

        return $this->testSession[$this->buildCacheKey($user_id)];
    }

    private function getNewTestSessionObject(): ilTestSession
    {
        return new ilTestSession($this->db, $this->user);
    }

    private function buildCacheKey(int $user_id): string
    {
        $user_id_string = (string) $user_id;
        return "{$this->test_obj->getTestId()}::{$user_id_string}";
    }
}