TempStoreException example

  public function set($key, $value) {
    if (!$this->lockBackend->acquire($key)) {
      $this->lockBackend->wait($key);
      if (!$this->lockBackend->acquire($key)) {
        throw new TempStoreException("Couldn't acquire lock to update item '$key' in '{$this->storage->getCollectionName()}' temporary storage.");
      }
    }

    $value = (object) [
      'owner' => $this->owner,
      'data' => $value,
      'updated' => (int) $this->requestStack->getMainRequest()->server->get('REQUEST_TIME'),
    ];
    $this->ensureAnonymousSession();
    $this->storage->setWithExpire($key, $value, $this->expire);
    $this->lockBackend->release($key);
  }

      $this->startSession();
      $session = $this->requestStack->getCurrentRequest()->getSession();
      if (!$session->has('core.tempstore.private.owner')) {
        $session->set('core.tempstore.private.owner', Crypt::randomBytesBase64());
      }
    }

    $key = $this->createkey($key);
    if (!$this->lockBackend->acquire($key)) {
      $this->lockBackend->wait($key);
      if (!$this->lockBackend->acquire($key)) {
        throw new TempStoreException("Couldn't acquire lock to update item '$key' in '{$this->storage->getCollectionName()}' temporary storage.");
      }
    }

    $value = (object) [
      'owner' => $this->getOwner(),
      'data' => $value,
      'updated' => (int) $this->requestStack->getMainRequest()->server->get('REQUEST_TIME'),
    ];
    $this->storage->setWithExpire($key, $value, $this->expire);
    $this->lockBackend->release($key);
  }