rxrust 0.15.0

A Rust implementation of Reactive Extensions.
Documentation 
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use crate::prelude::*;

/// Implements the Observer trait and Subscription trait. While the Observer is
/// the public API for consuming the values of an Observable, all Observers get
/// converted to a Subscriber, in order to provide Subscription capabilities.
#[derive(Clone)]
pub struct Subscriber<O, U> {
  pub(crate) observer: O,
  pub(crate) subscription: U,
}

impl<O> Subscriber<O, LocalSubscription> {
  pub fn local(observer: O) -> Self {
    Subscriber {
      observer,
      subscription: LocalSubscription::default(),
    }
  }
}

impl<O> Subscriber<O, SharedSubscription> {
  pub fn shared(observer: O) -> Self {
    Subscriber {
      observer,
      subscription: SharedSubscription::default(),
    }
  }
}

impl<Item, Err, O, U> Observer for Subscriber<O, U>
where
  O: Observer<Item = Item, Err = Err>,
  U: SubscriptionLike,
{
  type Item = Item;
  type Err = Err;
  fn next(&mut self, v: Item) {
    if !self.is_finished() {
      self.observer.next(v)
    }
  }

  fn error(&mut self, err: Err) {
    if !self.is_finished() {
      self.observer.error(err);
    }
  }

  fn complete(&mut self) {
    if !self.is_finished() {
      self.observer.complete();
    }
  }

  #[inline]
  fn is_stopped(&self) -> bool { self.observer.is_stopped() }
}

impl<O, U: SubscriptionLike> SubscriptionLike for Subscriber<O, U> {
  #[inline]
  fn is_closed(&self) -> bool { self.subscription.is_closed() }
  #[inline]
  fn unsubscribe(&mut self) { self.subscription.unsubscribe() }
}

#[cfg(test)]
mod test {
  use crate::prelude::*;
  use std::sync::{Arc, Mutex};

  #[test]
  fn shared_next_complete() {
    let (next, _, complete, mut subscriber) = shared_subscriber_creator();
    subscriber.next(1);
    subscriber.next(2);
    subscriber.complete();
    subscriber.next(3);
    subscriber.next(4);
    assert_eq!(*next.lock().unwrap(), 2);
    assert_eq!(*complete.lock().unwrap(), 1);
  }

  #[test]
  fn shared_err_complete() {
    let (next, error, _, mut subscriber) = shared_subscriber_creator();
    subscriber.next(1);
    subscriber.next(2);
    subscriber.error(());
    subscriber.next(3);
    subscriber.next(4);

    assert_eq!(*next.lock().unwrap(), 2);
    assert_eq!(*error.lock().unwrap(), 1);
  }

  type SubscriberInfo<O> =
    (Arc<Mutex<i32>>, Arc<Mutex<i32>>, Arc<Mutex<i32>>, O);
  fn shared_subscriber_creator()
  -> SubscriberInfo<impl Observer<Item = i32, Err = ()>> {
    let next = Arc::new(Mutex::new(0));
    let err = Arc::new(Mutex::new(0));
    let complete = Arc::new(Mutex::new(0));

    (
      next.clone(),
      err.clone(),
      complete.clone(),
      Subscriber::shared(ObserverAll::new(
        move |_| *next.lock().unwrap() += 1,
        move |_| *err.lock().unwrap() += 1,
        move || *complete.lock().unwrap() += 1,
      )),
    )
  }

  #[test]
  fn next_and_complete() {
    let mut next = 0;
    let mut complete = 0;

    let mut subscriber = Subscriber::local(ObserverAll::new(
      |_: &_| next += 1,
      |_: &i32| {},
      || complete += 1,
    ));

    subscriber.next(&1);
    subscriber.next(&2);
    subscriber.complete();
    subscriber.next(&3);
    subscriber.next(&4);
    assert_eq!(next, 2);
    assert_eq!(complete, 1);
  }

  #[test]
  fn next_and_error() {
    let mut next = 0;
    let mut err = 0;

    let mut subscriber =
      Subscriber::local(ObserverErr::new(|_: &_| next += 1, |_: &()| err += 1));

    subscriber.next(&1);
    subscriber.next(&2);
    subscriber.error(&());
    subscriber.next(&3);
    subscriber.next(&4);

    assert_eq!(next, 2);
    assert_eq!(err, 1);
  }
}