pub trait MutexProvider<T, K>: Send + Sync {
type Mutex: Send + Mutex<T>;
// Required method
fn get<'life0, 'async_trait>(
&'life0 self,
key: K,
) -> Pin<Box<dyn Future<Output = Result<Self::Mutex>> + Send + 'async_trait>>
where K: 'async_trait,
Self: 'async_trait,
'life0: 'async_trait;
}