Trait ObservationSession

Source

pub trait ObservationSession: Send {
    // Required methods
    fn profile(&self) -> &DeviceProfile;
    fn start(&mut self) -> DeviceResult<()>;
    fn poll(&mut self, kind: &str) -> DeviceResult<Option<Expr>>;
    fn stop(&mut self) -> DeviceResult<()>;
}

Expand description

Open read-only stream-device session.

This trait deliberately has no downcast hook and no generic command method. A caller holding this object can only observe and release the device.

fn hostile_caller(session: &mut dyn ObservationSession, request: EffectRequest) {
    session.invoke(request); // observation authority has no invocation escape
}