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use crate::futures::publisher::AsyncPublisher;
use crate::futures::subscriber::AsyncSubscriber;
use crate::ring_buffer::RingBuffer;
use crate::sequence::Sequence;
use crate::subscriber::Subscriber;
use std::sync::Arc;
#[derive(Clone)]
pub struct Eventador {
ring: Arc<RingBuffer>,
}
impl Eventador {
pub fn new(capacity: u64) -> anyhow::Result<Self> {
Ok(Self {
ring: Arc::new(RingBuffer::new(capacity)?),
})
}
pub fn publish<T: 'static + Send>(&self, message: T) {
let sequence = self.ring.next();
if let Some(event_store) = self.ring.get_envelope(sequence).clone() {
event_store.overwrite::<T>(sequence, message);
}
}
pub fn subscribe<T: 'static + Send>(&self) -> Subscriber<T> {
let sequence = Arc::new(Sequence::with_value(self.ring.sequencer().get() + 1));
self.ring
.sequencer()
.register_gating_sequence(sequence.clone());
Subscriber::new(self.ring.as_ref(), sequence)
}
pub fn async_publisher<T: 'static + Send + Unpin>(&self) -> AsyncPublisher<T> {
AsyncPublisher::new(self.ring.clone())
}
pub fn async_subscriber<T: 'static + Send + Unpin>(&self) -> AsyncSubscriber<T> {
let sequence = Arc::new(Sequence::with_value(self.ring.sequencer().get() + 1));
self.ring
.sequencer()
.register_gating_sequence(sequence.clone());
AsyncSubscriber::new(self.ring.clone(), sequence)
}
}
impl From<RingBuffer> for Eventador {
fn from(ring: RingBuffer) -> Self {
Self {
ring: Arc::new(ring),
}
}
}
impl From<Arc<RingBuffer>> for Eventador {
fn from(ring: Arc<RingBuffer>) -> Self {
Self { ring }
}
}
#[cfg(test)]
mod tests {
use crate::eventador::Eventador;
use crate::futures::publisher::AsyncPublisher;
use async_channel::{unbounded, RecvError};
use futures::SinkExt;
#[test]
fn publish_and_subscribe() {
let res = Eventador::new(4);
assert!(res.is_ok());
let disruptor: Eventador = res.unwrap();
let subscriber = disruptor.subscribe::<usize>();
assert_eq!(1, subscriber.sequence());
let mut i: usize = 1234;
disruptor.publish(i);
let mut msg = subscriber.recv().unwrap();
assert_eq!(i, *msg);
i += 1;
let disruptor2 = disruptor.clone();
std::thread::spawn(move || {
std::thread::sleep(std::time::Duration::from_secs(3));
disruptor2.publish(i);
});
msg = subscriber.recv().unwrap();
assert_eq!(i, *msg);
}
#[async_std::test]
async fn async_publish() {
let res = Eventador::new(4);
assert!(res.is_ok());
let disruptor: Eventador = res.unwrap();
let subscriber = disruptor.async_subscriber::<usize>();
let mut publisher: AsyncPublisher<usize> = disruptor.async_publisher();
let (sender, mut receiver) = unbounded::<Result<usize, RecvError>>();
let mut i: usize = 1234;
let mut sent = sender.send(Ok(i)).await;
assert!(sent.is_ok());
let _handle = async_std::task::spawn(async move {
publisher.send_all(&mut receiver).await.unwrap();
});
let mut msg = subscriber.recv().await.unwrap();
assert_eq!(i, *msg);
i += 1;
let disruptor2 = disruptor.clone();
async_std::task::spawn(async move {
async_std::task::sleep(std::time::Duration::from_secs(3)).await;
disruptor2.publish(i);
});
msg = subscriber.recv().await.unwrap();
assert_eq!(i, *msg);
i += 1;
sent = sender.send(Ok(i)).await;
assert!(sent.is_ok());
msg = subscriber.recv().await.unwrap();
assert_eq!(i, *msg);
}
#[derive(Debug, Eq, PartialEq)]
enum TestEnum {
SampleA,
}
#[test]
fn enum_specific_subscription() {
let res = Eventador::new(4);
assert!(res.is_ok());
let disruptor: Eventador = res.unwrap();
let subscriber = disruptor.subscribe::<TestEnum>();
assert_eq!(1, subscriber.sequence());
disruptor.publish(TestEnum::SampleA);
let msg = subscriber.recv().unwrap();
assert_eq!(TestEnum::SampleA, *msg);
}
}