fn start_light_sensor_scanner(
    sensor: Sensor,
    scan_duration_ms: i64,
    cancellation_rx: Receiver<()>,
) -> (Task<()>, UnboundedReceiver<LightData>) {
    let (sender, receiver) = unbounded::<LightData>();

    (
        fasync::Task::spawn(async move {
            let stream = futures::stream::unfold(sensor, |sensor| async move {
                let light_data = get_sensor_data(&sensor).await;
                Some((light_data, sensor))
            });
            let timer = fasync::Timer::new(Duration::from_millis(0).after_now()).fuse();
            futures::pin_mut!(timer, stream, cancellation_rx);
            let mut data = stream.next().await.expect("There should always be a first value");
            loop {
                futures::select! {
                    _ = timer => {
                        if let Some(new_data) = stream.next().await {
                            if data != new_data {
                                data = new_data;
                                if sender.unbounded_send(data).is_err() {
                                    break;
                                }
                            }
                        }
                        *timer =
                            fasync::Timer::new(Duration::from_millis(scan_duration_ms).after_now())
                                .fuse();
                    }
                    _ = cancellation_rx => break,
                }
            }
        }),
        receiver,
    )
}
/// Runs a task that periodically checks for changes on the light sensor
/// and sends notifications when the value changes.
/// Will not send any initial value if nothing changes.
/// This terminates when the receiver closes without panicking.
Runs a task that periodically checks for changes on the light sensor
and sends notifications when the value changes.
Will not send any initial value if nothing changes.
This terminates when the receiver closes without panicking.
Runs a task that periodically checks for changes on the light sensor and sends notifications when the value changes . Will not send any initial value if nothing changes . This terminates when the receiver closes without panicking .
fn start_light_sensor_scanner(
    sensor: Sensor,
    scan_duration_ms: i64,
    cancellation_rx: Receiver<()>,
) -> (Task<()>, UnboundedReceiver<LightData>) {
    let (sender, receiver) = unbounded::<LightData>();
    (
        fasync::Task::spawn(async move {
            let stream = futures::stream::unfold(sensor, |sensor| async move {
                let light_data = get_sensor_data(&sensor).await;
                Some((light_data, sensor))
            });
            let timer = fasync::Timer::new(Duration::from_millis(0).after_now()).fuse();
            futures::pin_mut!(timer, stream, cancellation_rx);
            let mut data = stream.next().await.expect("There should always be a first value");
            loop {
                futures::select! {
                    _ = timer => {
                        if let Some(new_data) = stream.next().await {
                            if data != new_data {
                                data = new_data;
                                if sender.unbounded_send(data).is_err() {
                                    break;
                                }
                            }
                        }
                        *timer =
                            fasync::Timer::new(Duration::from_millis(scan_duration_ms).after_now())
                                .fuse();
                    }
                    _ = cancellation_rx => break,
                }
            }
        }),
        receiver,
    )
}
fn start_light_sensor_scanner ( sensor : Sensor , scan_duration_ms : i64 , cancellation_rx : Receiver < ( ) > , ) -> ( Task < ( ) > , UnboundedReceiver < LightData > ) { let ( sender , receiver ) = unbounded :: < LightData > ( ) ; ( fasync :: Task :: spawn ( async move { let stream = futures :: stream :: unfold ( sensor , | sensor | async move { let light_data = get_sensor_data ( & sensor ) . await ; Some ( ( light_data , sensor ) ) } ) ; let timer = fasync :: Timer :: new ( Duration :: from_millis ( 0 ) . after_now ( ) ) . fuse ( ) ; futures :: pin_mut ! ( timer stream cancellation_rx ) ; let mut data = stream . next ( ) . await . expect ( " " ) ; loop { futures :: select ! { timer { if let Some ( new_data ) stream next ( ) await { if data new_data { data new_data if sender unbounded_send ( data ) is_err ( ) { break } } } timer fasync Timer new ( Duration from_millis ( scan_duration_ms ) after_now ( ) ) fuse ( ) } cancellation_rx break } } } ) , receiver , ) }
Runs a task that periodically checks for changes on the light sensor
and sends notifications when the value changes.
Runs a task that periodically checks for changes on the light sensor and sends notifications when the value changes .
sensor
Sensor
scan_duration_ms
i64
cancellation_rx
Receiver<()>
sensor
Sensor
scan_duration_ms
i64
cancellation_rx
Receiver<()>