public function getCache()
    {
        // @codingStandardsIgnoreStart
        @trigger_error(
            '"' .__METHOD__ . '" is deprecated as the service container will get removed.',
            E_USER_DEPRECATED
        );
        // @codingStandardsIgnoreEnd

        if (\is_callable($this->cache)) {
            $this->cache = \call_user_func($this->cache);
        }

        return $this->cache;
    }