Struct EventMetadata 

#[non_exhaustive]
pub struct EventMetadata {
    pub event_name: &'static str,
    pub type_id: TypeId,
    pub last_dispatch: Instant,
    pub dispatch_count: u64,
    pub listener_count: usize,
}

Immutable snapshot of an event type’s metrics.

Returned by crate::EventDispatcher::metrics. Each field reflects the value at the moment the snapshot was taken; subsequent dispatches do not mutate it.

Marked #[non_exhaustive] so future minor releases may add metric fields (e.g. error counts, percentile latencies) without breaking existing callers. External code must read fields by name, never construct EventMetadata via struct-literal syntax. The struct is only produced inside the crate.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

event_name: &'static str

Fully qualified name of the event type, as reported by std::any::type_name.

type_id: TypeId

TypeId of the event type. Stable for a given type within a single process run.

last_dispatch: Instant

Timestamp of the most recent dispatch of this event type.

dispatch_count: u64

Total number of times this event type has been dispatched since the dispatcher was created.

listener_count: usize

Number of listeners (sync + async) registered for this event type at the moment the snapshot was taken.

Implementations

impl EventMetadata

pub fn time_since_last_dispatch(&self) -> Duration

How long ago the most recent dispatch of this event type was.

Trait Implementations

impl Clone for EventMetadata

fn clone(&self) -> EventMetadata

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for EventMetadata

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

Formats the value using the given formatter.