private function validatePersisters(array $persisters)
    {
        foreach ($persisters as $name => $config) {
            $this->validateTypeAndService($config, sprintf('as3_modlr.persisters.%s', $name));
            switch ($config['type']) {
                case 'mongodb':
                    $this->validateLibClassExists('Persister\MongoDb\Persister', sprintf('as3_modlr.persisters.%s.type', $name));
                    $this->validatePersisterMongoDb($config);
                    break;
                default:
                    break;
            }
        }
    }