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#[derive(Clone, Default)]
pub struct EventHub {
inner: std::sync::Arc<std::sync::Mutex<EventHubState>>,
}
#[derive(Default)]
struct EventHubState {
next_sequence: u64,
events: Vec<(u64, crate::api::schema::EventEnvelope)>,
}
impl EventHub {
const MAX_EVENTS: usize = 512;
pub fn push(&self, event: crate::api::schema::EventEnvelope) {
let Ok(mut state) = self.inner.lock() else {
return;
};
state.next_sequence += 1;
let sequence = state.next_sequence;
state.events.push((sequence, event));
let overflow = state.events.len().saturating_sub(Self::MAX_EVENTS);
if overflow > 0 {
state.events.drain(0..overflow);
}
}
pub fn events_after(&self, sequence: u64) -> Vec<(u64, crate::api::schema::EventEnvelope)> {
let Ok(state) = self.inner.lock() else {
return Vec::new();
};
state
.events
.iter()
.filter(|(event_sequence, _)| *event_sequence > sequence)
.cloned()
.collect()
}
pub fn current_sequence(&self) -> u64 {
let Ok(state) = self.inner.lock() else {
return 0;
};
state.next_sequence
}
}
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