class.ilTestSessionFactory.php

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<?php
class ilTestSessionFactory
{
    private $testSession = array();

    private $testOBJ = null;

    public function __construct(ilObjTest $testOBJ)
    {
        $this->testOBJ = $testOBJ;
    }

    public function reset()
    {
        $this->testSession = array();
    }

    public function getSession($activeId = null)
    {
        if ($activeId === null ||
            $this->testSession === array() ||
            !array_key_exists($activeId, $this->testSession) ||
            $this->testSession[$activeId] === null
        ) {
            $testSession = $this->getNewTestSessionObject();

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

            if ($activeId) {
                $testSession->loadFromDb($activeId);
                $this->testSession[$activeId] = $testSession;
            } else {
                global $DIC;
                $ilUser = $DIC['ilUser'];

                $testSession->loadTestSession(
                    $this->testOBJ->getTestId(),
                    $ilUser->getId(),
                    $testSession->getAccessCodeFromSession()
                );

                return $testSession;
            }
        }

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

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

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

            $testSession->loadTestSession($this->testOBJ->getTestId(), $userId);

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

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

    private function getNewTestSessionObject()
    {
        if ($this->testOBJ->isDynamicTest()) {
            return new ilTestSessionDynamicQuestionSet();
        }
        return new ilTestSession();
    }

    private function buildCacheKey($userId): string
    {
        return "{$this->testOBJ->getTestId()}::{$userId}";
    }
}