protected function getDaemonOptions()
    {
        return [
            ['daemon', null, InputOption::VALUE_NONE,     'Run the command in daemon mode'],
            ['sleep',  null, InputOption::VALUE_OPTIONAL, 'Number of seconds to sleep when no job is available', 3],
            ['memory', null, InputOption::VALUE_OPTIONAL, 'The memory limit in megabytes', 128],
        ];
    }