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//! Demonstrating the `take_until()` operator with a notifier observable
//!
//! This example illustrates the functionality of the `take_until()` operator by
//! creating a stream and emitting elements until a notifier observable emits a signal.
//!
//! To run this example, execute `cargo run --example take_until_operator`.
use std::sync::{Arc, Mutex};
use rxr::{
subscribe::{Subscriber, Subscription, SubscriptionHandle, UnsubscribeLogic},
Observable, ObservableExt, Observer, Subject, Subscribeable,
};
use tokio::{sync::mpsc::channel, task, time};
const UNSUBSCRIBE_SIGNAL: bool = true;
#[tokio::main]
async fn main() {
let observable = Observable::new(|mut o| {
let done = Arc::new(Mutex::new(false));
let done_c = Arc::clone(&done);
let (tx, mut rx) = channel(10);
task::spawn(async move {
if let Some(UNSUBSCRIBE_SIGNAL) = rx.recv().await {
*done_c.lock().unwrap() = UNSUBSCRIBE_SIGNAL;
}
});
let join_handle = task::spawn(async move {
for i in 0..100 {
if *done.lock().unwrap() == UNSUBSCRIBE_SIGNAL {
break;
}
o.next(i);
time::sleep(time::Duration::from_millis(1)).await;
}
o.complete();
});
Subscription::new(
UnsubscribeLogic::Future(Box::pin(async move {
if tx.send(UNSUBSCRIBE_SIGNAL).await.is_err() {
println!("Receiver dropped.");
}
})),
SubscriptionHandle::JoinTask(join_handle),
)
});
let mut observer = Subscriber::on_next(|v| println!("Emitted {}", v));
observer.on_complete(|| println!("Completed"));
// Create notifier, it can be observable or one of the Subject variants.
let (mut emitter, receiver) = Subject::<()>::emitter_receiver();
// Turning Subject into an observable. To continue using the receiver later,
// utilize `.clone()`, e.g. `receiver.clone().into()`.
let subscription = observable
.take_until(receiver.into(), false)
.subscribe(observer);
// Allowing some time for the `take_until` function to register the notifier
// before emitting a signal. This step is unnecessary if you're not immediately
// sending a signal.
time::sleep(time::Duration::from_millis(1)).await;
// Send signal to stop source observable emitting values.
emitter.next(());
// Do something else here.
println!("Do something while Observable is emitting.");
// Wait for observable to finish before exiting the program.
if subscription.join_concurrent().await.is_err() {
// Handle error
}
println!("`main` function done")
}