Different session lifetime on different usecases

Using Neos & Flow Flow App Development
2

I had a look into the code and it does not seem that defining a lifetime for session scoped objects is possible.

… You could, however, store the objects in a cache (ensure the cache backend supports lifetime -> not SimpleFileCache) and the cache identifier in the session. If a user resumes the session you fetch the Basket or whatever from the cache. If the cache does not exist it is expired.

the session timeout has to be at least the highest cache lifetime, but you want to work with unlimited sessions anyway.

A basket implementation could look like this:

<?php

use Neos\Flow\Annotations as Flow;

/**
 * @Flow\Scope("session")
 */
class Basket
{
    /**
     * TODO: configure Objects.yaml and Caches.yaml for this property
     *
     * @Flow\Inject()
     * @var \Neos\Cache\Frontend\VariableFrontend
     */
    protected $storage = null;

    /**
     * @Flow\InjectConfiguration(path="session.basket.lifetime")
     * @var int
     */
    protected $lifetime = 0;

    /**
     * @Flow\Inject()
     * @var \Neos\Flow\Session\Session
     */
    protected $session = null;

    /**
     * @return array
     */
    public function getLineItems()
    {
        // return the items or an empty array if there are either none or the cache expired
        return $this->storage->get($this->session->getId() . '_lineItems') ?: [];
    }

    /**
     * @param array $lineItems
     * @throws \Neos\Cache\Exception
     * @throws \Neos\Flow\Session\Exception\SessionNotStartedException
     */
    public function setLineItems(array $lineItems)
    {
        $this->storage->set($this->session->getId() . '_lineItems', $lineItems, [], $this->lifetime);
    }
}