blob: 8389febbbc96b44dbd21cf887175d689807f6367 [file] [log] [blame]
#![feature(pin, arbitrary_self_types, futures_api)]
use futures::channel::oneshot;
use futures::executor::{block_on, block_on_stream};
use futures::future::{self, FutureExt, FutureObj};
use futures::stream::{StreamExt, futures_ordered, FuturesOrdered};
use futures_test::task::no_spawn_context;
#[test]
fn works_1() {
let (a_tx, a_rx) = oneshot::channel::<i32>();
let (b_tx, b_rx) = oneshot::channel::<i32>();
let (c_tx, c_rx) = oneshot::channel::<i32>();
let mut stream = futures_ordered(vec![a_rx, b_rx, c_rx]);
b_tx.send(99).unwrap();
assert!(stream.poll_next_unpin(&mut no_spawn_context()).is_pending());
a_tx.send(33).unwrap();
c_tx.send(33).unwrap();
let mut iter = block_on_stream(stream);
assert_eq!(Some(Ok(33)), iter.next());
assert_eq!(Some(Ok(99)), iter.next());
assert_eq!(Some(Ok(33)), iter.next());
assert_eq!(None, iter.next());
}
#[test]
fn works_2() {
let (a_tx, a_rx) = oneshot::channel::<i32>();
let (b_tx, b_rx) = oneshot::channel::<i32>();
let (c_tx, c_rx) = oneshot::channel::<i32>();
let mut stream = futures_ordered(vec![
FutureObj::new(Box::new(a_rx)),
FutureObj::new(Box::new(b_rx.join(c_rx).map(|(a, b)| Ok(a? + b?)))),
]);
let cx = &mut no_spawn_context();
a_tx.send(33).unwrap();
b_tx.send(33).unwrap();
assert!(stream.poll_next_unpin(cx).is_ready());
assert!(stream.poll_next_unpin(cx).is_pending());
c_tx.send(33).unwrap();
assert!(stream.poll_next_unpin(cx).is_ready());
}
#[test]
fn from_iterator() {
let stream = vec![
future::ready::<i32>(1),
future::ready::<i32>(2),
future::ready::<i32>(3)
].into_iter().collect::<FuturesOrdered<_>>();
assert_eq!(stream.len(), 3);
assert_eq!(block_on(stream.collect::<Vec<_>>()), vec![1,2,3]);
}
/* ToDo: This requires FutureExt::select to be implemented
#[test]
fn queue_never_unblocked() {
let (_a_tx, a_rx) = oneshot::channel::<Box<Any+Send>>();
let (b_tx, b_rx) = oneshot::channel::<Box<Any+Send>>();
let (c_tx, c_rx) = oneshot::channel::<Box<Any+Send>>();
let mut stream = futures_ordered(vec![
Box::new(a_rx) as Box<Future<Item = _, Error = _>>,
Box::new(b_rx.select(c_rx).then(|res| Ok(Box::new(res) as Box<Any+Send>))) as _,
]);
with_no_spawn_context(|cx| {
for _ in 0..10 {
assert!(stream.poll_next(cx).unwrap().is_pending());
}
b_tx.send(Box::new(())).unwrap();
assert!(stream.poll_next(cx).unwrap().is_pending());
c_tx.send(Box::new(())).unwrap();
assert!(stream.poll_next(cx).unwrap().is_pending());
assert!(stream.poll_next(cx).unwrap().is_pending());
})
}*/