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Use oneshot and future::select to cancel streams

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This commit is contained in:
Héctor Ramón Jiménez 2019-12-07 08:51:44 +01:00
parent e55dfa7551
commit 48145ba51e
3 changed files with 48 additions and 88 deletions
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49
examples/clock.rs
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@ -82,7 +82,7 @@ impl Application for Clock {
}
mod time {
use std::sync::{Arc, Mutex};
use std::sync::Arc;
pub fn every<Message>(
duration: std::time::Duration,
@ -108,59 +108,30 @@ mod time {
>,
}
struct TickState {
alive: Arc<Mutex<bool>>,
}
impl iced::subscription::Handle for TickState {
fn cancel(&mut self) {
match self.alive.lock() {
Ok(mut guard) => *guard = false,
_ => {}
}
}
}
impl<Message> iced::subscription::Definition for Tick<Message>
impl<Message> iced::subscription::Handle for Tick<Message>
where
Message: 'static,
{
type Message = Message;
type Output = Message;
fn id(&self) -> u64 {
0
}
fn stream(
&self,
) -> (
futures::stream::BoxStream<'static, Message>,
Box<dyn iced::subscription::Handle>,
) {
fn stream(&self) -> futures::stream::BoxStream<'static, Message> {
use futures::StreamExt;
let duration = self.duration.clone();
let function = self.message.clone();
let alive = Arc::new(Mutex::new(true));
let state = TickState {
alive: alive.clone(),
};
let stream =
futures::stream::iter(std::iter::repeat(())).map(move |_| {
std::thread::sleep(duration);
let stream = futures::stream::poll_fn(move |_| {
std::thread::sleep(duration);
function(chrono::Local::now())
});
if !*alive.lock().unwrap() {
return std::task::Poll::Ready(None);
}
let now = chrono::Local::now();
std::task::Poll::Ready(Some(now))
})
.map(move |time| function(time));
(stream.boxed(), Box::new(state))
stream.boxed()
}
}
}