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use std::sync::{
atomic::{AtomicBool, Ordering},
mpsc, Arc, Mutex,
};
use std::time::Duration;
pub trait Queue<T> {
fn offer(&mut self, v: T);
fn poll(&mut self) -> Option<T>;
fn put(&mut self, v: T);
fn take(&mut self) -> Option<T>;
}
#[derive(Debug, Clone)]
pub struct BlockingQueue<T> {
pub timeout: Option<Duration>,
pub panic: bool,
alive: Arc<Mutex<AtomicBool>>,
blocking_sender: Arc<Mutex<mpsc::Sender<T>>>,
blocking_recever: Arc<Mutex<mpsc::Receiver<T>>>,
}
impl<T> BlockingQueue<T> {
pub fn new() -> BlockingQueue<T> {
let (blocking_sender, blocking_recever) = mpsc::channel();
return BlockingQueue {
alive: Arc::new(Mutex::new(AtomicBool::new(true))),
timeout: None,
panic: false,
blocking_sender: Arc::new(Mutex::new(blocking_sender)),
blocking_recever: Arc::new(Mutex::new(blocking_recever)),
};
}
pub fn is_alive(&mut self) -> bool {
let alive = &self.alive.lock().unwrap();
return alive.load(Ordering::SeqCst);
}
pub fn stop(&mut self) {
{
let alive = &self.alive.lock().unwrap();
if !alive.load(Ordering::SeqCst) {
return;
}
alive.store(false, Ordering::SeqCst);
let sender = self.blocking_sender.lock().unwrap();
drop(sender);
}
}
}
impl<T: 'static + Send> Queue<T> for BlockingQueue<T> {
fn offer(&mut self, v: T) {
{
let alive = &self.alive.lock().unwrap();
if !alive.load(Ordering::SeqCst) {
return;
}
let result = self.blocking_sender.lock().unwrap().send(v);
if self.panic && result.is_err() {
panic!(result.err());
}
}
}
fn poll(&mut self) -> Option<T> {
if !self.is_alive() {
return None::<T>;
}
{
let result = self.blocking_recever.lock().unwrap().try_recv();
if self.panic && result.is_err() {
panic!(result.err());
}
return result.ok();
}
}
fn put(&mut self, v: T) {
self.offer(v);
}
fn take(&mut self) -> Option<T> {
loop {
if !self.is_alive() {
return None::<T>;
}
{
match self.timeout {
Some(duration) => {
let result = self.blocking_recever.lock().unwrap().recv_timeout(duration);
if self.panic && result.is_err() {
panic!(result.err());
}
return result.ok();
}
None => {
let result = self.blocking_recever.lock().unwrap().recv();
if self.panic && result.is_err() {
panic!(result.err());
}
return result.ok();
}
}
}
}
}
}