Struct coap_message_demos::cbor::TryingThroughMutex

pub struct TryingThroughMutex<T: SimpleCBORHandler>(pub Arc<Mutex<T>>);

Helper struct that accesses a SimpleCBORHandler intrough an Arc<Mutex<_>>, thus allowing easiy simultaneous access.

When implementing SimpelCBORHandler, it does not wait for the lock, but rather fails with a 5.03 Service Unavailable that usually prompts the client to retry. Note that this will not happen ever if the items are just accessed through different paths on the same handler, and neither will be if they are only ever locked outside the CoAP server’s main loop. (And even then, unless they’re locked for long, it’s very unlikely to be hit by chance).

TBD: Send a “Max-Age: 0” option along to indicate that the client can try again right away rather than wait the usual 60 seconds.

TBD: This may be a nice addition to the coap_handler crate in general (but needs the introduction of a std feature there).

Tuple Fields

0: Arc<Mutex<T>>

Trait Implementations

impl<T: SimpleCBORHandler> SimpleCBORHandler for TryingThroughMutex<T>

type Get = T::Get

type Put = T::Put

type Post = T::Post

fn get(&mut self) -> Result<Self::Get, u8>

fn put(&mut self, new: &Self::Put) -> u8

fn post(&mut self, request: &Self::Post) -> u8