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#![forbid(unsafe_code, future_incompatible)]
#![deny(
missing_debug_implementations,
nonstandard_style,
missing_copy_implementations,
unused_qualifications
)]
use futures_lite::Stream;
use std::{
fmt::{Debug, Formatter, Result},
future::Future,
sync::{Arc, RwLock},
task::Context,
};
use waker_set::WakerSet;
mod stream_stopper;
pub use stream_stopper::StreamStopper;
mod future_stopper;
pub use future_stopper::FutureStopper;
#[derive(Clone)]
pub struct Stopper(Arc<RwLock<StopperInner>>);
impl Stopper {
pub fn new() -> Self {
Self::default()
}
pub fn stop(&self) {
let mut lock = self.0.write().unwrap();
if !lock.stopped {
lock.stopped = true;
lock.waker.notify_all();
}
}
pub fn is_stopped(&self) -> bool {
self.0.read().unwrap().stopped
}
pub fn stop_stream<S: Stream>(&self, stream: S) -> StreamStopper<S> {
StreamStopper::new(&self, stream)
}
pub fn stop_future<F: Future>(&self, future: F) -> FutureStopper<F> {
FutureStopper::new(&self, future)
}
pub(crate) fn insert(&self, cx: &Context) -> usize {
self.0.write().unwrap().waker.insert(cx)
}
pub(crate) fn replace(&self, waker_id: &mut Option<usize>, cx: &Context) {
if let Some(id) = waker_id {
self.remove_waker(*id);
}
waker_id.replace(self.insert(&cx));
}
pub(crate) fn remove(&self, waker_id: &mut Option<usize>) {
if let Some(id) = waker_id.take() {
self.remove_waker(id);
}
}
pub(crate) fn remove_waker(&self, id: usize) {
self.0.write().unwrap().waker.cancel(id);
}
}
impl Default for Stopper {
fn default() -> Self {
Self(Arc::new(RwLock::new(StopperInner {
stopped: false,
waker: WakerSet::new(),
})))
}
}
impl Debug for Stopper {
fn fmt(&self, f: &mut Formatter<'_>) -> Result {
let lock = self.0.read().unwrap();
f.debug_struct("Stopper")
.field("stopped", &lock.stopped)
.finish()
}
}
struct StopperInner {
stopped: bool,
waker: WakerSet,
}