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// =============================================================================
// #######
// ### ### F: event.rs
// ## ## ## ## P: AppCore-Runtime
// ## ##
// C: 2026/05/29 20:47:35 by dnettoRaw
// ## ## ## ## U: 2026/07/23 23:50:45 by dnettoRaw
// ########### S: 1.0.1-rc.8
// =============================================================================
//! Event contract and ordered, duplicate-safe event registry.
//! Event payload transport uses `EventEnvelope`.
//! Handler outcomes may emit events through `CommandResult`.
use crate::error::RuntimeResult;
use crate::ids::EventName;
use crate::registry::NameRegistry;
/// Minimal runtime event contract.
pub trait RuntimeEvent {
/// Returns the stable event name used for registration.
fn name(&self) -> &EventName;
}
/// Ordered registry of declared event names.
#[derive(Debug, Default)]
pub struct EventRegistry {
names: NameRegistry<EventName>,
}
impl EventRegistry {
/// Creates an empty event registry.
pub fn new() -> Self {
Self::default()
}
/// Registers an event name, rejecting duplicates.
pub fn register(&mut self, name: EventName) -> RuntimeResult<()> {
self.names.register(name, "event")
}
/// Reports whether an event name is registered.
pub fn contains(&self, name: &EventName) -> bool {
self.names.contains(name)
}
/// Returns the number of registered event names.
pub fn len(&self) -> usize {
self.names.len()
}
/// Reports whether no event names are registered.
pub fn is_empty(&self) -> bool {
self.names.is_empty()
}
/// Returns event names in registration order.
pub fn list(&self) -> &[EventName] {
self.names.list()
}
}
#[cfg(test)]
#[path = "event_tests.rs"]
mod tests;