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//! `Subject` example
//!
//! This example demonstrates the usage of the `Subject` in the `rxr` library.
//!
//! The `Subject` acts as both an observer and observable in reactive programming,
//! broadcasting values to multiple observers.
//!
//! To run this example, execute `cargo run --example subject`.
use std::fmt::Display;
use rxr::{subjects::Subject, subscribe::Subscriber};
use rxr::{ObservableExt, Observer, Subscribeable};
pub fn create_subscriber<T: Display>(subscriber_id: i32) -> Subscriber<T> {
Subscriber::new(
move |v| println!("Subscriber #{} emitted: {}", subscriber_id, v),
|_| eprintln!("Error"),
move || println!("Completed {}", subscriber_id),
)
}
pub fn main() {
// Initialize a `Subject` and obtain its emitter and receiver.
let (mut emitter, mut receiver) = Subject::emitter_receiver();
// Registers `Subscriber` 1.
receiver.subscribe(create_subscriber(1));
emitter.next(101); // Emits 101 to registered `Subscriber` 1.
emitter.next(102); // Emits 102 to registered `Subscriber` 1.
// All Observable operators can be applied to the receiver.
// Registers mapped `Subscriber` 2.
receiver
.clone() // Shallow clone: clones only the pointer to the `Subject` object.
.map(|v| format!("mapped {}", v))
.subscribe(create_subscriber(2));
// Registers `Subscriber` 3.
receiver.subscribe(create_subscriber(3));
// Emits 103 to registered `Subscriber`'s 1, 2 and 3.
emitter.next(103);
// Calls `complete` on registered `Subscriber`'s 1, 2 and 3.
emitter.complete();
// Subscriber 4: post-completion subscribe, completes immediately.
receiver.subscribe(create_subscriber(4));
// Called post-completion, does not emit.
emitter.next(104);
}