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#![allow(bare_trait_objects, unknown_lints)]
extern crate futures;
use std::any::Any;
use futures::sync::oneshot;
use std::iter::FromIterator;
use futures::stream::{futures_unordered, FuturesUnordered};
use futures::prelude::*;
mod support;
#[test]
fn works_1() {
let (a_tx, a_rx) = oneshot::channel::<u32>();
let (b_tx, b_rx) = oneshot::channel::<u32>();
let (c_tx, c_rx) = oneshot::channel::<u32>();
let stream = futures_unordered(vec![a_rx, b_rx, c_rx]);
let mut spawn = futures::executor::spawn(stream);
b_tx.send(99).unwrap();
assert_eq!(Some(Ok(99)), spawn.wait_stream());
a_tx.send(33).unwrap();
c_tx.send(33).unwrap();
assert_eq!(Some(Ok(33)), spawn.wait_stream());
assert_eq!(Some(Ok(33)), spawn.wait_stream());
assert_eq!(None, spawn.wait_stream());
}
#[test]
fn works_2() {
let (a_tx, a_rx) = oneshot::channel::<u32>();
let (b_tx, b_rx) = oneshot::channel::<u32>();
let (c_tx, c_rx) = oneshot::channel::<u32>();
let stream = futures_unordered(vec![
Box::new(a_rx) as Box<Future<Item = _, Error = _>>,
Box::new(b_rx.join(c_rx).map(|(a, b)| a + b)),
]);
let mut spawn = futures::executor::spawn(stream);
a_tx.send(33).unwrap();
b_tx.send(33).unwrap();
assert!(spawn.poll_stream_notify(&support::notify_noop(), 0).unwrap().is_ready());
c_tx.send(33).unwrap();
assert!(spawn.poll_stream_notify(&support::notify_noop(), 0).unwrap().is_ready());
}
#[test]
fn from_iterator() {
use futures::future::ok;
use futures::stream::FuturesUnordered;
let stream = vec![
ok::<u32, ()>(1),
ok::<u32, ()>(2),
ok::<u32, ()>(3)
].into_iter().collect::<FuturesUnordered<_>>();
assert_eq!(stream.len(), 3);
assert_eq!(stream.collect().wait(), Ok(vec![1,2,3]));
}
#[test]
fn finished_future_ok() {
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 stream = futures_unordered(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>))),
]);
let mut spawn = futures::executor::spawn(stream);
for _ in 0..10 {
assert!(spawn.poll_stream_notify(&support::notify_noop(), 0).unwrap().is_not_ready());
}
b_tx.send(Box::new(())).unwrap();
let next = spawn.poll_stream_notify(&support::notify_noop(), 0).unwrap();
assert!(next.is_ready());
c_tx.send(Box::new(())).unwrap();
assert!(spawn.poll_stream_notify(&support::notify_noop(), 0).unwrap().is_not_ready());
assert!(spawn.poll_stream_notify(&support::notify_noop(), 0).unwrap().is_not_ready());
}
#[test]
fn iter_mut_cancel() {
let (a_tx, a_rx) = oneshot::channel::<u32>();
let (b_tx, b_rx) = oneshot::channel::<u32>();
let (c_tx, c_rx) = oneshot::channel::<u32>();
let mut stream = futures_unordered(vec![a_rx, b_rx, c_rx]);
for rx in stream.iter_mut() {
rx.close();
}
assert!(a_tx.is_canceled());
assert!(b_tx.is_canceled());
assert!(c_tx.is_canceled());
let mut spawn = futures::executor::spawn(stream);
assert_eq!(Some(Err(futures::sync::oneshot::Canceled)), spawn.wait_stream());
assert_eq!(Some(Err(futures::sync::oneshot::Canceled)), spawn.wait_stream());
assert_eq!(Some(Err(futures::sync::oneshot::Canceled)), spawn.wait_stream());
assert_eq!(None, spawn.wait_stream());
}
#[test]
fn iter_mut_len() {
let mut stream = futures_unordered(vec![
futures::future::empty::<(),()>(),
futures::future::empty::<(),()>(),
futures::future::empty::<(),()>()
]);
let mut iter_mut = stream.iter_mut();
assert_eq!(iter_mut.len(), 3);
assert!(iter_mut.next().is_some());
assert_eq!(iter_mut.len(), 2);
assert!(iter_mut.next().is_some());
assert_eq!(iter_mut.len(), 1);
assert!(iter_mut.next().is_some());
assert_eq!(iter_mut.len(), 0);
assert!(iter_mut.next().is_none());
}
#[test]
fn polled_only_once_at_most_per_iteration() {
#[derive(Debug, Clone, Copy, Default)]
struct F {
polled: bool,
}
impl Future for F {
type Item = ();
type Error = ();
fn poll(&mut self) -> Result<Async<Self::Item>, Self::Error> {
if self.polled {
panic!("polled twice")
} else {
self.polled = true;
Ok(Async::NotReady)
}
}
}
let tasks = FuturesUnordered::from_iter(vec![F::default(); 10]);
let mut tasks = futures::executor::spawn(tasks);
assert!(tasks.poll_stream_notify(&support::notify_noop(), 0).unwrap().is_not_ready());
assert_eq!(10, tasks.get_mut().iter_mut().filter(|f| f.polled).count());
let tasks = FuturesUnordered::from_iter(vec![F::default(); 33]);
let mut tasks = futures::executor::spawn(tasks);
assert!(tasks.poll_stream_notify(&support::notify_noop(), 0).unwrap().is_not_ready());
assert_eq!(33, tasks.get_mut().iter_mut().filter(|f| f.polled).count());
let tasks = FuturesUnordered::<F>::new();
let mut tasks = futures::executor::spawn(tasks);
assert!(tasks.poll_stream_notify(&support::notify_noop(), 0).unwrap().is_ready());
}
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