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use lru::LruCache;
use std::num::NonZeroUsize;
use tokio::sync::mpsc::{channel, Receiver, Sender};
use super::{MessageEvent, MessageId, SystemEvent};
pub struct MessageAggregator {
rx: Receiver<MessageEvent>,
tx: Sender<MessageEvent>,
message_cache: lru::LruCache<MessageId, MessageEvent>,
emitter: Option<Sender<SystemEvent>>,
}
impl MessageAggregator {
pub fn new() -> Self {
let (tx, rx) = channel::<MessageEvent>(100);
Self {
tx,
rx,
message_cache: LruCache::new(NonZeroUsize::new(100).unwrap()),
emitter: None,
}
}
pub fn get_sender(&self) -> Sender<MessageEvent> {
self.tx.clone()
}
pub fn set_handler(&mut self, emitter: Sender<SystemEvent>) -> () {
self.emitter = Some(emitter);
}
pub fn start(mut self) -> () {
tokio::spawn(async move {
loop {
match self.rx.recv().await {
None => return,
Some((timestamp, message)) => {
let last_seen_timestamp = self.message_cache.get(&message.id);
let current_timestamp = timestamp;
if last_seen_timestamp.is_none()
|| last_seen_timestamp.unwrap().0.as_micros()
< current_timestamp.as_micros()
{
self.message_cache
.put(message.id, (timestamp, message.clone()));
if let Some(emitter) = &self.emitter {
emitter
.send(SystemEvent::NewMessage((timestamp, message)))
.await;
}
};
}
}
}
});
}
}
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