Struct EventBus 

pub struct EventBus { /* private fields */ }

A broadcast channel for crawler control-plane events.

Implementations

impl EventBus

pub fn new(capacity: usize) -> Self

Creates an event bus with the specified retained-message capacity.

Panics

Panics when capacity is zero.

pub fn subscribe(&self) -> EventStream

Creates a subscriber that receives events emitted after subscription.

pub fn emit(&self, event: CrawlerEvent)

Broadcasts an event to current subscribers.

The send error produced when no subscribers exist is intentionally ignored.

pub fn subscriber_count(&self) -> usize

Returns the number of active subscribers.

Trait Implementations

impl Clone for EventBus

fn clone(&self) -> EventBus

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for EventBus

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for EventBus

fn default() -> Self

Returns the “default value” for a type.