Created
April 7, 2019 16:55
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use futures::{ | |
future::{lazy, ok, Future}, | |
Async, Poll, | |
}; | |
use std::time::Duration; | |
use tokio; | |
use tokio_timer::sleep; | |
use std::sync::atomic::{AtomicBool, Ordering}; | |
use std::sync::Arc; | |
pub struct Service { | |
running: Arc<AtomicBool>, | |
} | |
impl Service { | |
fn new(running: Arc<AtomicBool>) -> Self { | |
Service { running } | |
} | |
} | |
impl Future for Service { | |
type Item = (); | |
type Error = (); | |
fn poll(&mut self) -> Poll<Self::Item, Self::Error> { | |
if self.running.load(Ordering::Relaxed) { | |
print!("."); | |
futures::task::current().notify(); | |
Ok(Async::NotReady) | |
} else { | |
Ok(Async::Ready(())) | |
} | |
} | |
} | |
fn start(running: Arc<AtomicBool>) -> impl Future<Item = (), Error = ()> { | |
Service::new(running).and_then(|_| ok(())) | |
} | |
fn stop(running: Arc<AtomicBool>) -> impl Future<Item = (), Error = ()> { | |
sleep(Duration::from_millis(1)) | |
.and_then(move |_| { | |
print!("\nStopping\n"); | |
running.store(false, Ordering::Relaxed); | |
ok(()) | |
}) | |
.map_err(|_| ()) | |
} | |
fn main() { | |
tokio::run(lazy(|| { | |
let running = Arc::new(AtomicBool::new(true)); | |
print!("Starting\n"); | |
tokio::spawn(start(running.clone())); | |
print!("Started\n"); | |
tokio::spawn(stop(running)); | |
ok(()) | |
})); | |
} |
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