flurx 0.1.6

Create reactive asynchronous data flow
Documentation 
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use core::marker::PhantomData;
use core::time::{Duration};
use std::time::Instant;

use crate::selector::Selector;

#[must_use]
#[inline]
pub fn time<State>(duration: Duration) -> impl Selector<State> {
    Time {
        start: Instant::now(),
        duration,
        _m: PhantomData,
    }
}

struct Time<State> {
    start: Instant,
    duration: Duration,
    _m: PhantomData<State>,
}


impl<State> Selector<State> for Time<State>
{
    type Output = ();

    fn select(&self, _: State) -> Option<Self::Output> {
        let elapsed = Instant::now().duration_since(self.start);
        (self.duration <= elapsed).then_some(())
    }
}


#[cfg(test)]
mod tests {
    use std::time::Duration;

    use crate::Scheduler;
    use crate::selector::delay;
    use crate::tests::result_event;

    #[tokio::test]
    async fn delay_300_ms() {
        let mut scheduler = Scheduler::<()>::default();
        let (tx, rx) = result_event();
        scheduler.schedule(|task| async move {
            task.will(delay::time(Duration::from_millis(300))).await;
            tx.set(true);
        });
        scheduler.run(()).await;
        tokio::time::sleep(Duration::from_millis(300)).await;
        scheduler.run(()).await;

        assert!(rx.get());
    }
}