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use ckb_logger::error;
use futures::sync::oneshot;
use parking_lot::Mutex;
use std::sync::mpsc;
use std::sync::Arc;
use std::thread::JoinHandle;
use tokio::sync::oneshot as tokio_oneshot;
#[derive(Debug)]
pub enum SignalSender {
Future(oneshot::Sender<()>),
Crossbeam(ckb_channel::Sender<()>),
Std(mpsc::Sender<()>),
Tokio(tokio_oneshot::Sender<()>),
}
impl SignalSender {
pub fn send(self) {
match self {
SignalSender::Crossbeam(tx) => {
if let Err(e) = tx.send(()) {
error!("handler signal send error {:?}", e);
};
}
SignalSender::Std(tx) => {
if let Err(e) = tx.send(()) {
error!("handler signal send error {:?}", e);
};
}
SignalSender::Future(tx) => {
if let Err(e) = tx.send(()) {
error!("handler signal send error {:?}", e);
};
}
SignalSender::Tokio(tx) => {
if let Err(e) = tx.send(()) {
error!("handler signal send error {:?}", e);
};
}
}
}
}
#[derive(Debug)]
struct Handler<T> {
signal: SignalSender,
thread: JoinHandle<T>,
}
#[derive(Clone, Debug)]
pub struct StopHandler<T> {
inner: Option<Arc<Mutex<Option<Handler<T>>>>>,
}
impl<T> StopHandler<T> {
pub fn new(signal: SignalSender, thread: JoinHandle<T>) -> StopHandler<T> {
let handler = Handler { signal, thread };
StopHandler {
inner: Some(Arc::new(Mutex::new(Some(handler)))),
}
}
pub fn try_send(&mut self) {
let inner = self
.inner
.take()
.expect("Stop signal can only be sent once");
if let Ok(lock) = Arc::try_unwrap(inner) {
let handler = lock.lock().take().expect("Handler can only be taken once");
let Handler { signal, thread } = handler;
signal.send();
if let Err(e) = thread.join() {
error!("handler thread join error {:?}", e);
};
};
}
}