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| use std::sync::{Arc, Mutex, Condvar}; | |
| use std::time::{Duration, Instant}; | |
| use std::thread; | |
| //use std::sync::atomic::{AtomicBool, Ordering}; | |
| trait Factory<'a> { | |
| type Output: 'a; | |
| fn create(&self) -> Self::Output; | |
| } | |
| struct ExpireStore<T> { | |
| value: Arc<T>, | |
| timestamp: Instant, | |
| recreate: bool, | |
| } | |
| struct Expire<T> { | |
| store: Mutex<ExpireStore<T>>, | |
| recreate: Condvar, | |
| lifetime: Duration, | |
| } | |
| impl<'a, T: 'a + Send + Sync> Expire<T> { | |
| fn new<F: Factory<'a, Output=T>>(factory: F, lifetime: Duration) -> Arc<Expire<T>> { | |
| let inital = factory.create(); | |
| let store = ExpireStore { | |
| value: Arc::new(inital), | |
| timestamp: Instant::now(), | |
| recreate: false, | |
| }; | |
| let exp = Arc::new(Expire { | |
| store: Mutex::new(store), | |
| recreate: Condvar::new(), | |
| lifetime: lifetime, | |
| }); | |
| let e = exp.clone(); | |
| thread::spawn(move || { | |
| while Arc::strong_count(&e) > 1 || Arc::weak_count(&e) > 0 { | |
| let store = e.store.lock().unwrap(); | |
| } | |
| }); | |
| exp | |
| } | |
| fn get(&self) -> Arc<T> { | |
| let mut store = self.store.lock().unwrap(); | |
| if store.timestamp.elapsed() >= self.lifetime { | |
| store.recreate = true; | |
| self.recreate.notify_one(); | |
| } | |
| store.value.clone() | |
| } | |
| } | |
| fn main() { | |
| } |
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