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This commit is contained in:
Nell
2026-07-13 18:46:19 +02:00
parent dc2be94a8d
commit c96101ec3d
6 changed files with 55 additions and 536 deletions
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Cargo.lock
Generated
+1 -1
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@@ -1384,10 +1384,10 @@ name = "event_bus"
version = "0.1.0" version = "0.1.0"
dependencies = [ dependencies = [
"criterion", "criterion",
"glob",
"parking_lot", "parking_lot",
"tokio", "tokio",
"tracing", "tracing",
"uuid",
] ]
[[package]] [[package]]
event_bus/Cargo.toml
+1 -1
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@@ -14,9 +14,9 @@ harness = false
[dependencies] [dependencies]
tokio = { version = "1.52.3", default-features = false, features = ["rt", "sync"] } tokio = { version = "1.52.3", default-features = false, features = ["rt", "sync"] }
glob = "0.3.3"
parking_lot = "0.12.5" parking_lot = "0.12.5"
tracing = "0.1" tracing = "0.1"
uuid = { version = "1.23.5", features = ["v4"] }
[dev-dependencies] [dev-dependencies]
tokio = { version = "1.52.3", default-features = false, features = ["rt", "rt-multi-thread", "macros", "time", "sync"] } tokio = { version = "1.52.3", default-features = false, features = ["rt", "rt-multi-thread", "macros", "time", "sync"] }
event_bus/benches/event_bus_throughput.rs
-134
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@@ -9,7 +9,6 @@ use event_bus::EventBus;
use tokio::runtime::Runtime; use tokio::runtime::Runtime;
const TOPIC: &str = "bench-topic"; const TOPIC: &str = "bench-topic";
const PATTERN: &str = "bench-*";
#[derive(Clone)] #[derive(Clone)]
struct SmallEvent { struct SmallEvent {
@@ -473,82 +472,6 @@ fn bench_typed_callback(c: &mut Criterion) {
group.finish(); group.finish();
} }
fn bench_pattern_callback(c: &mut Criterion) {
let rt = runtime();
let mut group = c.benchmark_group("event_bus/pattern_callback");
group.throughput(Throughput::Elements(1));
group.bench_function("small_struct", |b| {
b.to_async(&rt).iter_custom(|iters| async move {
let bus = Arc::new(EventBus::with_capacity(iters as usize + 1024));
let received = Arc::new(AtomicU64::new(0));
let handler_count = Arc::clone(&received);
let subscription = bus.on_pattern::<SmallEvent, _>(PATTERN, move |topic, event| {
let _ = topic;
let _ = event.value;
handler_count.fetch_add(1, Ordering::Relaxed);
});
let start = Instant::now();
for i in 0..iters {
bus.emit(TOPIC, SmallEvent { value: i });
}
wait_until_received(&received, iters).await;
let elapsed = start.elapsed();
subscription.abort();
elapsed
});
});
group.bench_function("arc_payload_1kb", |b| {
b.to_async(&rt).iter_custom(|iters| async move {
let bus = Arc::new(EventBus::with_capacity(iters as usize + 1024));
let payload: Arc<[u8]> = Arc::from(vec![7_u8; 1024].into_boxed_slice());
let received = Arc::new(AtomicU64::new(0));
let handler_count = Arc::clone(&received);
let subscription =
bus.on_pattern::<ArcPayloadEvent, _>(PATTERN, move |topic, event| {
let _ = topic;
let _ = event.id;
let _ = event.payload.len();
handler_count.fetch_add(1, Ordering::Relaxed);
});
let start = Instant::now();
for i in 0..iters {
bus.emit(
TOPIC,
ArcPayloadEvent {
id: i,
payload: Arc::clone(&payload),
},
);
}
wait_until_received(&received, iters).await;
let elapsed = start.elapsed();
subscription.abort();
elapsed
});
});
group.finish();
}
fn bench_multiple_subscribers(c: &mut Criterion) { fn bench_multiple_subscribers(c: &mut Criterion) {
let rt = runtime(); let rt = runtime();
@@ -597,69 +520,12 @@ fn bench_multiple_subscribers(c: &mut Criterion) {
group.finish(); group.finish();
} }
fn bench_multiple_patterns(c: &mut Criterion) {
let rt = runtime();
let mut group = c.benchmark_group("event_bus/multiple_patterns");
group.throughput(Throughput::Elements(1));
for pattern_count in [1_u64, 4, 16, 64, 256] {
group.bench_function(format!("{pattern_count}_patterns_one_match"), |b| {
b.to_async(&rt).iter_custom(|iters| async move {
let bus = Arc::new(EventBus::with_capacity(iters as usize + 1024));
let received = Arc::new(AtomicU64::new(0));
let mut subscriptions = Vec::with_capacity(pattern_count as usize);
for index in 0..pattern_count {
let pattern = if index == 0 {
PATTERN.to_string()
} else {
format!("unused-{index}-*")
};
let handler_count = Arc::clone(&received);
let subscription =
bus.on_pattern::<SmallEvent, _>(&pattern, move |topic, event| {
let _ = topic;
let _ = event.value;
handler_count.fetch_add(1, Ordering::Relaxed);
});
subscriptions.push(subscription);
}
let start = Instant::now();
for i in 0..iters {
bus.emit(TOPIC, SmallEvent { value: i });
}
wait_until_received(&received, iters).await;
let elapsed = start.elapsed();
for subscription in subscriptions {
subscription.abort();
}
elapsed
});
});
}
group.finish();
}
criterion_group!( criterion_group!(
benches, benches,
bench_emit_no_subscriber, bench_emit_no_subscriber,
bench_raw_subscriber, bench_raw_subscriber,
bench_typed_callback, bench_typed_callback,
bench_pattern_callback,
bench_multiple_subscribers, bench_multiple_subscribers,
bench_multiple_patterns,
); );
criterion_main!(benches); criterion_main!(benches);
event_bus/src/bus.rs
+49 -182
View File
@@ -2,12 +2,13 @@ use std::any::Any;
use std::future::Future; use std::future::Future;
use std::sync::Arc; use std::sync::Arc;
use glob::Pattern;
use parking_lot::RwLock; use parking_lot::RwLock;
use std::collections::HashMap; use std::collections::HashMap;
use tokio::sync::broadcast; use tokio::sync::broadcast;
use tokio::task::JoinHandle; use tokio::task::JoinHandle;
use tracing::log::kv::{Key, Value};
use tracing::{debug, trace, warn}; use tracing::{debug, trace, warn};
use uuid::Uuid;
/// Raw event type: an atomic reference-counted pointer to any value. /// Raw event type: an atomic reference-counted pointer to any value.
pub type AnyEvent = Arc<dyn Any + Send + Sync>; pub type AnyEvent = Arc<dyn Any + Send + Sync>;
@@ -15,6 +16,25 @@ pub type AnyEvent = Arc<dyn Any + Send + Sync>;
/// Default buffer capacity for each broadcast channel. /// Default buffer capacity for each broadcast channel.
const DEFAULT_CAPACITY: usize = 64; const DEFAULT_CAPACITY: usize = 64;
#[derive(Debug, Clone, PartialEq, Eq)]
enum ScopeValue {
String(String),
Uuid(Uuid),
}
impl ScopeValue {
fn into_string(self) -> String {
match self {
Self::String(value) => value,
Self::Uuid(value) => value.to_string(),
}
}
}
#[derive(Debug, Clone, PartialEq, Eq)]
struct Scope {
key: String,
value: ScopeValue,
}
/// The central event bus. /// The central event bus.
/// ///
/// Share it via `Arc<EventBus>` across modules. /// Share it via `Arc<EventBus>` across modules.
@@ -60,37 +80,10 @@ const DEFAULT_CAPACITY: usize = 64;
/// # tokio::time::sleep(std::time::Duration::from_millis(10)).await; /// # tokio::time::sleep(std::time::Duration::from_millis(10)).await;
/// # }); /// # });
/// ``` /// ```
///
/// # Example — glob pattern with topic
/// ```rust,no_run
/// use std::sync::Arc;
/// use oxspeak_server_lib::event_bus::EventBus;
///
/// #[derive(Clone, Debug)]
/// struct User { name: String }
///
/// # tokio_test::block_on(async {
/// let bus = Arc::new(EventBus::new());
///
/// bus.on_pattern::<User, _>("user-*", |topic, user| {
/// match topic.as_str() {
/// "user-created" => println!("Created : {:?}", user),
/// "user-deleted" => println!("Deleted : {:?}", user),
/// other => println!("{}: {:?}", other, user),
/// }
/// });
///
/// bus.emit("user-created", User { name: "Alice".into() });
/// bus.emit("user-deleted", User { name: "Bob".into() });
/// # tokio::time::sleep(std::time::Duration::from_millis(10)).await;
/// # });
/// ```
#[derive(Debug)] #[derive(Debug)]
pub struct EventBus { pub struct EventBus {
/// Channels indexed by exact topic. /// Channels indexed by exact topic.
channels: RwLock<HashMap<String, broadcast::Sender<AnyEvent>>>, channels: RwLock<HashMap<String, broadcast::Sender<AnyEvent>>>,
/// Channels for glob-pattern subscriptions.
patterns: RwLock<Vec<(Pattern, broadcast::Sender<(String, AnyEvent)>)>>,
capacity: usize, capacity: usize,
} }
@@ -103,7 +96,6 @@ impl EventBus {
); );
Self { Self {
channels: RwLock::new(HashMap::new()), channels: RwLock::new(HashMap::new()),
patterns: RwLock::new(Vec::new()),
capacity: DEFAULT_CAPACITY, capacity: DEFAULT_CAPACITY,
} }
} }
@@ -113,7 +105,6 @@ impl EventBus {
debug!("EventBus created with capacity {}", capacity); debug!("EventBus created with capacity {}", capacity);
Self { Self {
channels: RwLock::new(HashMap::new()), channels: RwLock::new(HashMap::new()),
patterns: RwLock::new(Vec::new()),
capacity, capacity,
} }
} }
@@ -151,7 +142,6 @@ impl EventBus {
/// Emits an event on a topic. /// Emits an event on a topic.
/// ///
/// - Pushes the event into the exact-topic channel (if subscribers exist). /// - Pushes the event into the exact-topic channel (if subscribers exist).
/// - Pushes the event into all glob-pattern channels that match the topic.
/// - If nobody is listening, the event is silently dropped. /// - If nobody is listening, the event is silently dropped.
/// ///
/// # Example /// # Example
@@ -167,7 +157,6 @@ impl EventBus {
trace!(topic, "Emitting event"); trace!(topic, "Emitting event");
let event: AnyEvent = Arc::new(event); let event: AnyEvent = Arc::new(event);
// Exact-topic subscribers
if let Some(tx) = self.channels.read().get(topic) { if let Some(tx) = self.channels.read().get(topic) {
let receiver_count = tx.receiver_count(); let receiver_count = tx.receiver_count();
let _ = tx.send(Arc::clone(&event)); let _ = tx.send(Arc::clone(&event));
@@ -176,20 +165,35 @@ impl EventBus {
receiver_count, "Event delivered to exact-topic channel" receiver_count, "Event delivered to exact-topic channel"
); );
} }
}
// Glob-pattern subscribers // todo : undocumented...
let patterns = self.patterns.read(); pub fn emit_scoped<T>(&self, topic: &str, scopes: impl IntoIterator<Item = Scope>, event: T)
for (pattern, tx) in patterns.iter() { where
if pattern.matches(topic) { T: Any + Send + Sync + 'static,
let receiver_count = tx.receiver_count(); {
let _ = tx.send((topic.to_string(), Arc::clone(&event))); let event: AnyEvent = Arc::new(event);
trace!(
topic, // Émission sur le topic général.
pattern = pattern.as_str(), self.emit_arc(topic, Arc::clone(&event));
receiver_count,
"Event delivered to pattern channel" // Émission sur chaque topic scoped.
); for scope in scopes {
} let scoped_topic = format!("{}:{}:{}", scope.key, scope.value.into_string(), topic);
self.emit_arc(&scoped_topic, Arc::clone(&event));
}
}
// todo : undocumented...
fn emit_arc(&self, topic: &str, event: AnyEvent) {
trace!(topic, "Emitting event");
if let Some(tx) = self.channels.read().get(topic) {
let receiver_count = tx.receiver_count();
let _ = tx.send(event);
trace!(topic, receiver_count, "Event delivered to channel");
} }
} }
@@ -307,143 +311,6 @@ impl EventBus {
}) })
} }
/// Subscribes to all topics matching a glob pattern.
///
/// The handler receives `(topic, value)` — the topic name is included to
/// distinguish `user-created` from `user-deleted`, for example.
///
/// **No pre-registration required**: future topics are automatically covered.
/// Supports glob syntax: `*` (any sequence), `?` (one character),
/// `[abc]` (character class).
///
/// Returns a [`JoinHandle`] to cancel the subscription if needed.
///
/// # Example
/// ```rust,no_run
/// # use std::sync::Arc;
/// # use oxspeak_server_lib::event_bus::EventBus;
/// # #[derive(Clone, Debug)] struct User { name: String }
/// # let bus = Arc::new(EventBus::new());
/// bus.on_pattern::<User, _>("user-*", |topic, user| {
/// match topic.as_str() {
/// "user-created" => println!("Created : {:?}", user),
/// "user-deleted" => println!("Deleted : {:?}", user),
/// other => println!("{}: {:?}", other, user),
/// }
/// });
///
/// bus.emit("user-created", User { name: "Alice".into() });
/// bus.emit("user-deleted", User { name: "Bob".into() });
/// ```
pub fn on_pattern<T, F>(&self, pattern: &str, handler: F) -> JoinHandle<()>
where
T: Any + Send + Sync + Clone + 'static,
F: Fn(String, T) + Send + Sync + 'static,
{
let glob = Pattern::new(pattern).expect("invalid glob pattern");
let (tx, mut rx) = broadcast::channel(self.capacity);
self.patterns.write().push((glob, tx));
let pattern_owned = pattern.to_string();
debug!(pattern, "Sync pattern subscriber registered");
tokio::spawn(async move {
loop {
match rx.recv().await {
Ok((topic, evt)) => {
if let Some(typed) = evt.downcast_ref::<T>() {
trace!(
topic,
pattern = pattern_owned,
"Sync pattern handler invoked"
);
handler(topic, typed.clone());
}
}
Err(broadcast::error::RecvError::Lagged(n)) => {
warn!(
pattern = pattern_owned,
skipped = n,
"Pattern subscriber lagged, messages dropped"
);
}
Err(broadcast::error::RecvError::Closed) => {
debug!(
pattern = pattern_owned,
"Channel closed, sync pattern subscriber exiting"
);
break;
}
}
}
})
}
/// Subscribes to all topics matching a glob pattern, with an **async** handler.
///
/// Returns a [`JoinHandle`] to cancel the subscription if needed.
///
/// # Example
/// ```rust,no_run
/// # use std::sync::Arc;
/// # use oxspeak_server_lib::event_bus::EventBus;
/// # #[derive(Clone, Debug)] struct User { name: String }
/// # let bus = Arc::new(EventBus::new());
/// bus.on_pattern_async::<User, _, _>("user-*", |topic, user| async move {
/// match topic.as_str() {
/// "user-created" => println!("(async) Created : {:?}", user),
/// "user-deleted" => println!("(async) Deleted : {:?}", user),
/// other => println!("(async) {}: {:?}", other, user),
/// }
/// });
///
/// bus.emit("user-created", User { name: "Alice".into() });
/// ```
pub fn on_pattern_async<T, F, Fut>(&self, pattern: &str, handler: F) -> JoinHandle<()>
where
T: Any + Send + Sync + Clone + 'static,
F: Fn(String, T) -> Fut + Send + Sync + 'static,
Fut: Future<Output = ()> + Send + 'static,
{
let glob = Pattern::new(pattern).expect("invalid glob pattern");
let (tx, mut rx) = broadcast::channel(self.capacity);
self.patterns.write().push((glob, tx));
let pattern_owned = pattern.to_string();
debug!(pattern, "Async pattern subscriber registered");
tokio::spawn(async move {
loop {
match rx.recv().await {
Ok((topic, evt)) => {
if let Some(typed) = evt.downcast_ref::<T>() {
trace!(
topic,
pattern = pattern_owned,
"Async pattern handler invoked"
);
handler(topic, typed.clone()).await;
}
}
Err(broadcast::error::RecvError::Lagged(n)) => {
warn!(
pattern = pattern_owned,
skipped = n,
"Pattern subscriber lagged, messages dropped"
);
}
Err(broadcast::error::RecvError::Closed) => {
debug!(
pattern = pattern_owned,
"Channel closed, async pattern subscriber exiting"
);
break;
}
}
}
})
}
// ───────────────────────────────────────────────────────────────────────── // ─────────────────────────────────────────────────────────────────────────
// Subscription — low-level access (advanced use cases) // Subscription — low-level access (advanced use cases)
// ───────────────────────────────────────────────────────────────────────── // ─────────────────────────────────────────────────────────────────────────
event_bus/src/lib.rs
+2 -115
View File
@@ -1,115 +1,3 @@
//! # Event Bus
//!
//! An asynchronous event bus for routing typed messages between modules
//! without direct coupling.
//!
//! ## Features
//!
//! - **Key → event mapping**: each topic (`&str`) is independent
//! - **Type-unrestricted**: any `T: Any + Send + Sync + Clone`
//! - **Targeted wake-up**: only subscribers of the matching topic are woken up
//! - **Callback API**: JavaScript-style — `bus.on("topic", |payload| { ... })`
//! - **Glob pattern**: `on_pattern("user-*", |topic, payload| { ... })`
//! - **Async handlers**: `on_async` and `on_pattern_async`
//!
//! ## Example — sync callback
//!
//! ```rust,no_run
//! use std::sync::Arc;
//! use oxspeak_server_lib::event_bus::EventBus;
//!
//! #[derive(Clone, Debug)]
//! struct User { name: String }
//!
//! # tokio_test::block_on(async {
//! let bus = Arc::new(EventBus::new());
//!
//! bus.on::<User>("user-connected", |user| {
//! println!("Connected: {:?}", user);
//! });
//!
//! bus.emit("user-connected", User { name: "Alice".into() });
//! # tokio::time::sleep(std::time::Duration::from_millis(10)).await;
//! # });
//! ```
//!
//! ## Example — async callback
//!
//! ```rust,no_run
//! use std::sync::Arc;
//! use oxspeak_server_lib::event_bus::EventBus;
//!
//! #[derive(Clone, Debug)]
//! struct User { name: String }
//!
//! # tokio_test::block_on(async {
//! let bus = Arc::new(EventBus::new());
//!
//! bus.on_async::<User, _, _>("user-connected", |user| async move {
//! println!("(async) Connected: {:?}", user);
//! });
//!
//! bus.emit("user-connected", User { name: "Bob".into() });
//! # tokio::time::sleep(std::time::Duration::from_millis(10)).await;
//! # });
//! ```
//!
//! ## Example — glob pattern (topic included in the callback)
//!
//! ```rust,no_run
//! use std::sync::Arc;
//! use oxspeak_server_lib::event_bus::EventBus;
//!
//! #[derive(Clone, Debug)]
//! struct User { name: String }
//!
//! # tokio_test::block_on(async {
//! let bus = Arc::new(EventBus::new());
//!
//! bus.on_pattern::<User, _>("user-*", |topic, user| {
//! match topic.as_str() {
//! "user-created" => println!("Created : {:?}", user),
//! "user-deleted" => println!("Deleted : {:?}", user),
//! other => println!("{}: {:?}", other, user),
//! }
//! });
//!
//! bus.emit("user-created", User { name: "Alice".into() });
//! bus.emit("user-deleted", User { name: "Bob".into() });
//! # tokio::time::sleep(std::time::Duration::from_millis(10)).await;
//! # });
//! ```
//!
//! ## Example — multi-type with `match_event!` (advanced)
//!
//! ```rust,no_run
//! use std::sync::Arc;
//! use oxspeak_server_lib::event_bus::EventBus;
//! use oxspeak_server_lib::match_event;
//!
//! #[derive(Clone, Debug)] struct User { name: String }
//! #[derive(Clone, Debug)] struct UdpMetric { value: f32 }
//!
//! # tokio_test::block_on(async {
//! let bus = Arc::new(EventBus::new());
//! let mut rx = bus.on_raw("mixed-topic");
//!
//! bus.emit("mixed-topic", User { name: "Alice".into() });
//!
//! if let Ok(evt) = rx.recv().await {
//! match_event!(evt,
//! User => |u| println!("User: {:?}", u),
//! UdpMetric => |m| println!("Metric: {:?}", m),
//! );
//! }
//! # });
//! ```
mod bus;
// Public re-exports
pub use bus::{AnyEvent, EventBus};
/// Downcasts an [`AnyEvent`] to one or more concrete types and executes /// Downcasts an [`AnyEvent`] to one or more concrete types and executes
/// the matching closure if the type matches. /// the matching closure if the type matches.
/// ///
@@ -154,9 +42,8 @@ macro_rules! match_event {
}; };
} }
// ───────────────────────────────────────────────────────────────────────────── mod bus;
// Tests pub use bus::{AnyEvent, EventBus};
// ─────────────────────────────────────────────────────────────────────────────
#[cfg(test)] #[cfg(test)]
mod tests; mod tests;
event_bus/src/tests.rs
+1 -102
View File
@@ -1,6 +1,7 @@
use crate::{match_event, EventBus}; use crate::{match_event, EventBus};
use std::sync::atomic::{AtomicBool, AtomicU32, Ordering}; use std::sync::atomic::{AtomicBool, AtomicU32, Ordering};
use std::sync::Arc; use std::sync::Arc;
#[derive(Clone, Debug, PartialEq)] #[derive(Clone, Debug, PartialEq)]
struct User { struct User {
name: String, name: String,
@@ -126,108 +127,6 @@ async fn test_on_async_callback() {
assert!(received.load(Ordering::SeqCst)); assert!(received.load(Ordering::SeqCst));
} }
// ── on_pattern ────────────────────────────────────────────────────────────
#[tokio::test]
async fn test_on_pattern_callback_receives_topic_and_payload() {
let bus = Arc::new(EventBus::new());
let created = Arc::new(AtomicBool::new(false));
let deleted = Arc::new(AtomicBool::new(false));
let c = Arc::clone(&created);
let d = Arc::clone(&deleted);
bus.on_pattern::<User, _>("user-*", move |topic, user| match topic.as_str() {
"user-created" if user.name == "Dave" => c.store(true, Ordering::SeqCst),
"user-deleted" if user.name == "Eve" => d.store(true, Ordering::SeqCst),
_ => {}
});
bus.emit(
"user-created",
User {
name: "Dave".into(),
},
);
bus.emit("user-deleted", User { name: "Eve".into() });
tokio::time::sleep(std::time::Duration::from_millis(30)).await;
assert!(created.load(Ordering::SeqCst));
assert!(deleted.load(Ordering::SeqCst));
}
#[tokio::test]
async fn test_on_pattern_does_not_match_other_topics() {
let bus = Arc::new(EventBus::new());
let called = Arc::new(AtomicBool::new(false));
let flag = Arc::clone(&called);
bus.on_pattern::<User, _>("user-*", move |_, _| {
flag.store(true, Ordering::SeqCst);
});
bus.emit(
"server-created",
User {
name: "Ghost".into(),
},
);
tokio::time::sleep(std::time::Duration::from_millis(20)).await;
assert!(!called.load(Ordering::SeqCst));
}
#[tokio::test]
async fn test_on_pattern_no_pre_registration_needed() {
// Le pattern est enregistré avant que le topic n'existe
let bus = Arc::new(EventBus::new());
let received = Arc::new(AtomicBool::new(false));
let flag = Arc::clone(&received);
bus.on_pattern::<User, _>("user-*", move |topic, user| {
if topic == "user-new-topic" && user.name == "Frank" {
flag.store(true, Ordering::SeqCst);
}
});
bus.emit(
"user-new-topic",
User {
name: "Frank".into(),
},
);
tokio::time::sleep(std::time::Duration::from_millis(20)).await;
assert!(received.load(Ordering::SeqCst));
}
// ── on_pattern_async ──────────────────────────────────────────────────────
#[tokio::test]
async fn test_on_pattern_async_callback() {
let bus = Arc::new(EventBus::new());
let received = Arc::new(AtomicBool::new(false));
let flag = Arc::clone(&received);
bus.on_pattern_async::<User, _, _>("user-*", move |topic, user| {
let f = Arc::clone(&flag);
async move {
if topic == "user-created" && user.name == "Hank" {
f.store(true, Ordering::SeqCst);
}
}
});
bus.emit(
"user-created",
User {
name: "Hank".into(),
},
);
tokio::time::sleep(std::time::Duration::from_millis(20)).await;
assert!(received.load(Ordering::SeqCst));
}
// ── on_raw + match_event! ───────────────────────────────────────────────── // ── on_raw + match_event! ─────────────────────────────────────────────────
#[tokio::test] #[tokio::test]