jobflow 0.3.0

Executes jobs in order
Documentation 
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use crate::sync::promise::{PollPromise, Promise};
use crossbeam::channel::{Receiver, TryRecvError};

pub struct RecvPromise<T> {
    receiver: Receiver<T>,
}

impl<T> RecvPromise<T> {
    pub fn new(receiver: Receiver<T>) -> Self {
        Self { receiver }
    }
}

impl<T: Send> Promise for RecvPromise<T> {
    type Output = T;

    fn poll(&mut self) -> PollPromise<Self::Output> {
        match self.receiver.try_recv() {
            Ok(t) => PollPromise::Ready(t),
            Err(TryRecvError::Empty) => PollPromise::Pending,
            Err(TryRecvError::Disconnected) => {
                panic!("Promise channel is disconnected")
            }
        }
    }
}