medea-reactive 0.1.3

Reactive mutable data containers.
Documentation 
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//! Default [`SubscribersStore`] for collections.

use std::cell::RefCell;

use futures::{channel::mpsc, stream::LocalBoxStream};

use super::SubscribersStore;

/// Default [`SubscribersStore`] for collections.
#[derive(Debug)]
pub struct SubStore<T>(RefCell<Vec<mpsc::UnboundedSender<T>>>);

// Implemented manually to omit redundant `T: Default` trait bound, imposed by
// `#[derive(Default)]`.
impl<T> Default for SubStore<T> {
    fn default() -> Self {
        Self(RefCell::new(Vec::new()))
    }
}

impl<T> SubscribersStore<T, T> for SubStore<T>
where
    T: Clone + 'static,
{
    fn send_update(&self, value: T) {
        self.0
            .borrow_mut()
            .retain(|sub| sub.unbounded_send(value.clone()).is_ok());
    }

    fn subscribe(&self) -> LocalBoxStream<'static, T> {
        let (tx, rx) = mpsc::unbounded();
        self.0.borrow_mut().push(tx);
        Box::pin(rx)
    }

    fn wrap(&self, value: T) -> T {
        value
    }
}