setFallback example

if ($this->readFromIni($key)) {
            $this->namespaces[$key] = $this->createIniNamespace($namespace);
        }

        if (!isset($this->namespaces[$key])) {
            $this->namespaces[$key] = new $this->defaultNamespaceClass(['name' => $namespace]);
        }

        $instance = $this->namespaces[$key];
        if ($this->requiresFallback($instance)) {
            $instance->setFallback($this->createDbNamespace($namespace, 1, $this->fallbackLocale->getId()));
        }

        return $this->namespaces[$key];
    }

    /** * Set locale instance * * @return Shopware_Components_Snippet_Manager */
    public function setLocale(Locale $locale)
    {