Exploring Zend\Di caching

CompiledDi.php

<?php
namespace My\Di\Cache;

use Zend\Di\Di as ZendDi;

class CompiledDi extends ZendDi {
    public function get($name, $params = array()) {
        if($params) {
            return parent::get($name, $params);
        }
        //just a sample protected var used here. Don't know how it is called in Zend\Di\Di
        if(isset($this->_instances[$name])) {
            return $this->_instances[$name];
        }
        switch($name) {
            case 'zfmongodbodm-cachedreader':
                return new \Doctrine\Common\Annotations\CachedReader(
                    $this->get('zfmongodbodm-indexedreader'),
                    $this->get('zfmongodbodm-annotationcache')
                );
                break;
            case 'zfmongodbodm-annotationcache':
                return new Doctrine\Common\Cache\ArrayCache('some_namespace');
                break;
            case 'zfmongodbodm-indexedreader':
                return new \Doctrine\Common\Annotations\IndexedReader(
                    $this->get('zfmongodbodm-annotationreader')
                );
                break;
            case 'zfmongodbodm-annotationreader':
                return new \Doctrine\Common\Annotations\AnnotationReader();
                break;
            default:
                return parent::get($name);
                break;
        }
    }
}

configuration.php

<?php
//This is the current instance definition:
return array(
    'instance' => array(
        
        'alias' => array(
            'zfmongodbodm-cachedreader'       => 'Doctrine\Common\Annotations\CachedReader',
            'zfmongodbodm-annotationcache'    => 'Doctrine\Common\Cache\ArrayCache',
            'zfmongodbodm-indexedreader'      => 'Doctrine\Common\Annotations\IndexedReader',
            'zfmongodbodm-annotationreader'   => 'Doctrine\Common\Annotations\AnnotationReader',
        ),
        
        //parameters configuration
        'zfmongodbodm-cachedreader' => array(
            'parameters' => array(
                'reader' => 'zfmongodbodm-indexedreader',
                'cache' => 'zfmongodbodm-annotationcache',
            ),
        ),
        'zfmongodbodm-annotationcache' => array(
            'parameters' => array(
                'namespace' => 'zfmongodbodm_annotation',
            ),
        ),
        'zfmongodbodm-indexedreader' => array(
            'parameters' => array(
                'reader' => 'zfmongodbodm-annotationreader',
            ),
        ),
    ),
);