How can i keep a global instance which i can't be dropped during the application running

[jinkaz]

i wanner integrate a sdk which connected a service like consul as its client.The sdk should be needed to keep it globally during my application running lifecyle. i prefer to use state to do it ,but i not sure that is a good idea just like below code:
#[launch]
fn rocket() -> _ {
let a = Arc::new(Sm::init());
let sm = Arc::clone(&a);

rocket::build().manage(sm)

}

pub struct Sm;

impl Sm {
pub fn init()->impl NamingService{
//.....
}}

thanks in advance

[zolagonano]

That actually seems like a good idea but there are other ways to achieve that, for example by using lazy_static crate and Mutex.

lazy_static! {
    static ref SM: Arc<Mutex<Sm>> = Arc::new(Mutex::new(Sm::init()));
}