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#![feature(test)]
extern crate test;
use crate::test::Bencher;
use futures::channel::oneshot;
use futures::executor::block_on;
use futures::future::{self, FutureExt};
use futures::stream::{self, StreamExt};
use futures::task::Poll;
use std::collections::VecDeque;
use std::thread;
#[bench]
fn oneshot_streams(b: &mut Bencher) {
const STREAM_COUNT: usize = 10_000;
const STREAM_ITEM_COUNT: usize = 1;
b.iter(|| {
let mut txs = VecDeque::with_capacity(STREAM_COUNT);
let mut rxs = Vec::new();
for _ in 0..STREAM_COUNT {
let (tx, rx) = oneshot::channel();
txs.push_back(tx);
rxs.push(rx);
}
thread::spawn(move || {
let mut last = 1;
while let Some(tx) = txs.pop_front() {
let _ = tx.send(stream::iter(last..last + STREAM_ITEM_COUNT));
last += STREAM_ITEM_COUNT;
}
});
let mut flatten = stream::unfold(rxs.into_iter(), |mut vals| {
async {
if let Some(next) = vals.next() {
let val = next.await.unwrap();
Some((val, vals))
} else {
None
}
}
.boxed()
})
.flatten_unordered(None);
block_on(future::poll_fn(move |cx| {
let mut count = 0;
loop {
match flatten.poll_next_unpin(cx) {
Poll::Ready(None) => break,
Poll::Ready(Some(_)) => {
count += 1;
}
_ => {}
}
}
assert_eq!(count, STREAM_COUNT * STREAM_ITEM_COUNT);
Poll::Ready(())
}))
});
}
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