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use ferris::*;
use spin;
use std::collections::HashMap;
use std::mem;
use std::sync::atomic::{AtomicBool, AtomicU64, AtomicUsize, Ordering};
use std::sync::{Arc, Weak};
use std::thread;
use std::time::{Duration, Instant};
use std::u64;
type TimerID = u64;
type TimerKey = (u64, usize);
type Callback = (Arc<AtomicBool>, Box<dyn Fn() -> () + Send + 'static>);
const ACCURACY: Duration = Duration::from_millis(100);
const OFFSET: Duration = Duration::from_millis(1000);
struct RunnerInner {
keys: AtomicU64,
wheel: spin::Mutex<CopyWheel<TimerKey>>,
running: AtomicBool,
callback: spin::Mutex<HashMap<TimerID, Callback>>,
}
pub struct Timer {
pending: Arc<AtomicBool>,
runner: Weak<RunnerInner>,
id: u64,
cnt: AtomicUsize,
}
struct Runner(Arc<RunnerInner>, Option<thread::JoinHandle<()>>);
impl Runner {
fn new() -> Self {
let inner = Arc::new(RunnerInner {
running: AtomicBool::new(true),
callback: spin::Mutex::new(HashMap::new()),
keys: AtomicU64::new(0),
wheel: spin::Mutex::new(CopyWheel::<TimerKey>::new(vec![
Resolution::HundredMs,
Resolution::Sec,
Resolution::Min,
])),
});
// start runner thread
let handle = {
let inner = inner.clone();
thread::spawn(move || {
let mut next = Instant::now() + ACCURACY;
while inner.running.load(Ordering::Acquire) {
// sleep
let now = Instant::now();
if next > now {
thread::sleep(next - now);
}
next = next + ACCURACY;
// extract expired events
let expired = inner.wheel.lock().expire();
// handle expired events
for key in &expired {
if let Some((pending, callback)) = inner.callback.lock().get(&key.0) {
if pending.swap(false, Ordering::SeqCst) {
callback();
}
} else {
unreachable!()
};
}
}
})
};
Runner(inner, Some(handle))
}
pub fn timer(&self, callback: Box<dyn Fn() -> () + Send + 'static>) -> Timer {
let id = self.0.keys.fetch_add(1, Ordering::Relaxed);
let pending = Arc::new(AtomicBool::new(false));
assert!(id < u64::MAX, "wrapping of ids");
self.0
.callback
.lock()
.insert(id, (pending.clone(), callback));
Timer {
id,
pending: pending,
runner: Arc::downgrade(&self.0.clone()),
cnt: AtomicUsize::new(0),
}
}
}
impl Timer {
pub fn reset(&self, duration: Duration) {
if let Some(runner) = self.runner.upgrade() {
let mut wheel = runner.wheel.lock();
let cnt = self.cnt.fetch_add(1, Ordering::SeqCst);
self.pending.store(true, Ordering::SeqCst);
wheel.stop((self.id, cnt));
wheel.start((self.id, cnt + 1), duration - OFFSET);
}
}
pub fn start(&self, duration: Duration) {
if self.pending.load(Ordering::Acquire) {
return;
}
if let Some(runner) = self.runner.upgrade() {
let mut wheel = runner.wheel.lock();
if !self.pending.swap(true, Ordering::SeqCst) {
let cnt = self.cnt.fetch_add(1, Ordering::SeqCst);
wheel.start((self.id, cnt + 1), duration - OFFSET);
}
}
}
pub fn stop(&self) {
if self.pending.load(Ordering::Acquire) {
if let Some(runner) = self.runner.upgrade() {
let mut wheel = runner.wheel.lock();
if self.pending.swap(false, Ordering::SeqCst) {
let cnt = self.cnt.load(Ordering::SeqCst);
wheel.stop((self.id, cnt));
}
}
}
}
}
impl Drop for Runner {
fn drop(&mut self) {
// stop the callback thread
self.0.running.store(false, Ordering::SeqCst);
if let Some(handle) = mem::replace(&mut self.1, None) {
handle.join().unwrap();
}
}
}
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