Zend_Cache understanding issue - zend-framework

Question

I try to use Zend_Cache (first try) to save information about user grants. The idea and most of the source code comes from Oleg Krivtsovs tutorial.
I get an error, if I try to retrieve my cache.
Call to a member function getItem() on array
Here the implementation of FilesystemCache, in my global.php
'caches' => [
'FilesystemCache' => [
'adapter' => [
'name' => Filesystem::class,
'options' => [
// Store cached data in this directory.
'cache_dir' => './data/cache',
// Store cached data for 1 hour.
'ttl' => 60*60*1
],
],
'plugins' => [
[
'name' => 'serializer',
'options' => [
],
],
],
],
],
Here my factory class:
<?php
namespace User\Service;
use User\Controller\Plugin\AuthPlugin;
use User\Model\GrantsTable;
use User\Model\UserTable;
use Zend\Authentication\AuthenticationService;
use Zend\ServiceManager\Factory\FactoryInterface;
use Interop\Container\ContainerInterface;
class AccessControlFactory implements FactoryInterface {
public function __invoke(ContainerInterface $container, $requestedName, array $options = null) {
$config = $container->get('config');
$userTable = $container->get(UserTable::class);
$grantsTable = $container->get(GrantsTable::class);
$cache = $config['caches']['FilesystemCache'];
$userplugin = $container->get(AuthPlugin::class);
// $authentication = $container->get( \Zend\Authentication\AuthenticationService::class);
return new AccessControl($userTable, $grantsTable, $cache, $userplugin);//, $authentication
}
}
Now in the init function within my AccessControl Service, I try to retrieve from the cache:
$this->cache->getItem('rbac_container', $result);
There I get the above error.
Any help with a bit of explanation would be appreciated.

Answer 1

What you're injecting to the AccessControl constructor is an array, not a cache implementation, because $config['caches']['FilesystemCache'] returns an array of FilesystemCache options (adapter, plugins, etc.). What you're supposed to do is fetch the cache implementation via the ContainerInterface, like this:
$cache = $container->get('FilesystemCache');
Then the ContainerInterface will depend on StorageCacheAbstractServiceFactory to find your requested cache configs and return the class for you.