Zend Framework 2 - Cache-conform service factories - php

Question

The zend file application.config.php offers some way to cache the config, which I find very nice for a production system:
return array(
'modules' => array(
'Application',
),
'module_listener_options' => array(
'module_paths' => array(
'./module',
'./vendor'
),
'config_glob_paths' => array('config/autoload/{,*.}{global,local}.php'),
'config_cache_enabled' => true,
'config_cache_key' => md5('config'),
'module_map_cache_enabled' => true,
'module_map_cache_key' => md5('module_map'),
'cache_dir' => './data/cache',
),
);
However, activating that leads immediately to errors like
Fatal error: Call to undefined method Closure::__set_state()
This has to do with factories written as closures, like these:
'service_manager' => array(
'factories' => array(
'auth.service' => function($sm) {
/* hic sunt ponies */
},
),
),
Unfortunately, the issues only tell me why this error happens, but not how to resolve it.
How can I rework this and similar factories so the cache will work with them?

Answer 1

Rework your factory closures to factory classes.
Config
'service_manager' => array(
'factories' => array(
'auth.service' => \Fully\Qualified\NS\AuthFactory::class,
),
),
Factory
namespace Fully\Qualified\NS;
use Zend\ServiceManager\FactoryInterface;
use Zend\ServiceManager\ServiceLocatorInterface;
class AuthFactory implements FactoryInterface
{
public function createService(ServiceLocatorInterface $serviceLocator) {
// create your object and set dependencies
return $object
}
}
Besides this approach making caching possible, another advantage is that PHP will parse your config faster since it doesn't have to create a Closure class on each request for each anonymous function.