code: public function load()
      {
          if (!isset($this->cache[$this->testSessionId])) {
              $encodedData = $this->getStorageService()->get($this->getUserKey(), $this->getStorageKey());
              \common_Logger::d(sprintf('QtiTimer: Loaded %d bytes from state storage', strlen($encodedData)));
  
              $this->cache[$this->testSessionId] = $this->getStorageFormat()->decode($encodedData);
          }
  
          return $this->cache[$this->testSessionId];
      }
docs: Loads the timer data from the storage
  @return array