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use crate::prelude::*; use std::fmt::{Debug, Formatter}; mod local_subject; pub use local_subject::*; mod shared_subject; pub use shared_subject::*; #[derive(Default, Clone)] pub struct Subject<V, S> { pub(crate) observers: SubjectObserver<V>, pub(crate) subscription: S, } impl<V, S, O> Subject<V, S> where V: InnerDeref<Target = Vec<O>>, { #[inline] pub fn new() -> Self where Self: Default, { Self::default() } #[inline] pub fn subscribed_size(&self) -> usize { self.observers.observers.inner_deref().len() } } impl<O, U: SubscriptionLike> SubscriptionLike for Subject<O, U> { #[inline] fn is_closed(&self) -> bool { self.subscription.is_closed() } #[inline] fn unsubscribe(&mut self) { self.subscription.unsubscribe(); } } impl<Item, Err, U, O, V> Observer<Item, Err> for Subject<V, U> where V: InnerDerefMut<Target = Vec<O>>, O: Observer<Item, Err> + SubscriptionLike, Item: Clone, Err: Clone, { #[inline] fn next(&mut self, value: Item) { self.observers.next(value) } #[inline] fn error(&mut self, err: Err) { self.observers.error(err) } #[inline] fn complete(&mut self) { self.observers.complete() } #[inline] fn is_stopped(&self) -> bool { self.observers.is_stopped() } } #[derive(Default, Clone)] pub(crate) struct SubjectObserver<V> { pub(crate) observers: V, is_stopped: bool, } impl<Item, Err, V, O> Observer<Item, Err> for SubjectObserver<V> where V: InnerDerefMut<Target = Vec<O>>, O: Observer<Item, Err> + SubscriptionLike, Item: Clone, Err: Clone, { fn next(&mut self, value: Item) { self.observers.inner_deref_mut().drain_filter(|subscriber| { subscriber.next(value.clone()); subscriber.is_finished() }); } fn error(&mut self, err: Err) { let mut observers = self.observers.inner_deref_mut(); observers .iter_mut() .for_each(|subscriber| subscriber.error(err.clone())); observers.clear(); self.is_stopped = true; } fn complete(&mut self) { let mut observers = self.observers.inner_deref_mut(); observers .iter_mut() .for_each(|subscriber| subscriber.complete()); observers.clear(); self.is_stopped = true; } #[inline] fn is_stopped(&self) -> bool { self.is_stopped } } impl<V, O, S> Debug for Subject<V, S> where V: InnerDeref<Target = Vec<O>>, { fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result { f.debug_struct("LocalSubject") .field( "observer_count", &self.observers.observers.inner_deref().len(), ) .finish() } } #[cfg(test)] mod test { use super::*; use futures::executor::ThreadPool; #[test] fn base_data_flow() { let mut i = 0; { let mut broadcast = Subject::new(); broadcast.clone().subscribe(|v| i = v * 2); broadcast.next(1); } assert_eq!(i, 2); } #[test] #[should_panic] fn error() { let mut broadcast = Subject::new(); broadcast .clone() .subscribe_err(|_: i32| {}, |e: _| panic!(e)); broadcast.next(1); broadcast.error(&"should panic!"); } #[test] fn unsubscribe() { let mut i = 0; { let mut subject = Subject::new(); subject.clone().subscribe(|v| i = v).unsubscribe(); subject.next(100); } assert_eq!(i, 0); } #[test] fn empty_local_subject_can_convert_to_shared() { let pool = ThreadPool::new().unwrap(); use std::sync::{Arc, Mutex}; let value = Arc::new(Mutex::new(0)); let c_v = value.clone(); let mut subject = Subject::new(); subject .clone() .to_shared() .observe_on(pool) .to_shared() .subscribe(move |v: i32| { *value.lock().unwrap() = v; }); subject.next(100); std::thread::sleep(std::time::Duration::from_millis(1)); assert_eq!(*c_v.lock().unwrap(), 100); } #[test] fn subject_subscribe_subject() { let mut local = LocalSubject::new(); let local2 = LocalSubject::new(); local.clone().actual_subscribe(Subscriber { observer: local2.observers, subscription: local2.subscription, }); local.next(1); local.error(2); } }