protected function __construct(Connection $conn, Configuration $config, EventManager $eventManager)
{
$this->conn = $conn;
$this->config = $config;
$this->eventManager = $eventManager;
$metadataFactoryClassName = $config->getClassMetadataFactoryName();
$this->metadataFactory = new $metadataFactoryClassName;
$this->metadataFactory->setEntityManager($this);
$this->metadataFactory->setCacheDriver($this->config->getMetadataCacheImpl());
$this->unitOfWork = new UnitOfWork($this);
$this->proxyFactory = new ProxyFactory($this,
$config->getProxyDir(),
$config->getProxyNamespace(),
$config->getAutoGenerateProxyClasses());
}