private function configureProcessProperties(OptionsResolver $resolver)
    {
        $resolver
            ->setRequired('command')
            ->setAllowedTypes('command', 'string');

        $resolver
            ->setDefined('process_name')
            ->setAllowedTypes('process_name', 'string');

        $resolver->setDefined('numprocs')
            ->setAllowedTypes('numprocs', 'int');

        $resolver->setDefined('numprocs_start')
            ->setAllowedTypes('numprocs_start', 'int');

        $resolver->setDefined('priority')
            ->setAllowedTypes('priority', 'int');
    }