function getKeys()
    {
        $keys = array();
        foreach ($this->layers as $layer) {
            $test = $this->configuration[$layer];
            if (isset($test['__channels'])) {
                foreach ($test['__channels'] as $channel => $configs) {
                    $keys = array_merge($keys, $configs);
                }
            }

            unset($test['__channels']);
            $keys = array_merge($keys, $test);

        }
        return array_keys($keys);
    }