51 lines
1.2 KiB
Rust
51 lines
1.2 KiB
Rust
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use std::collections::HashMap;
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use std::sync::Mutex;
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use serde::{Deserialize, Serialize};
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use tokio::sync::broadcast;
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use crate::k2v::item_table::*;
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#[derive(Debug, Hash, Clone, PartialEq, Eq, Serialize, Deserialize)]
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pub struct PollKey {
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pub partition: K2VItemPartition,
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pub sort_key: String,
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}
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#[derive(Default)]
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pub struct SubscriptionManager {
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subscriptions: Mutex<HashMap<PollKey, broadcast::Sender<K2VItem>>>,
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}
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impl SubscriptionManager {
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pub fn new() -> Self {
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Self::default()
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}
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pub fn subscribe(&self, key: &PollKey) -> broadcast::Receiver<K2VItem> {
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let mut subs = self.subscriptions.lock().unwrap();
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if let Some(s) = subs.get(key) {
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s.subscribe()
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} else {
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let (tx, rx) = broadcast::channel(8);
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subs.insert(key.clone(), tx);
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rx
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}
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}
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pub fn notify(&self, item: &K2VItem) {
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let key = PollKey {
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partition: item.partition.clone(),
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sort_key: item.sort_key.clone(),
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};
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let mut subs = self.subscriptions.lock().unwrap();
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if let Some(s) = subs.get(&key) {
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if s.send(item.clone()).is_err() {
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// no more subscribers, remove channel from here
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// (we will re-create it later if we need to subscribe again)
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subs.remove(&key);
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}
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}
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}
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}
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