getChainDriverServiceName example

    public function process(ContainerBuilder $container)
    {
        if (!$this->enabled($container)) {
            return;
        }

        $mappingDriverDef = $this->getDriver($container);
        $chainDriverDefService = $this->getChainDriverServiceName($container);
        // Definition for a Doctrine\Persistence\Mapping\Driver\MappingDriverChain         $chainDriverDef = $container->getDefinition($chainDriverDefService);
        foreach ($this->namespaces as $namespace) {
            $chainDriverDef->addMethodCall('addDriver', [$mappingDriverDef, $namespace]);
        }

        if (!\count($this->aliasMap)) {
            return;
        }

        $configurationServiceName = $this->getConfigurationServiceName($container);