Struct Meta 

pub struct Meta { /* private fields */ }

Metadata attached to every event envelope.

• id: unique identifier for the envelope.
• timestamp: creation time in nanoseconds since Unix epoch (truncated to u64).
• actor_name: actor name emitting the event.
• correlation_id: optional id to link related events together. Useful for tracing and debugging event flows.

There is no logic at Maiko built around the correlation_id, so the value doesn’t have any special meaning to the runtime. It’s up to the user to set and interpret it. For example, an actor may choose to set the correlation_id of child events, but it may also have another meaning in a different context.

Implementations

impl Meta

pub fn new(actor_id: ActorId, correlation_id: Option<EventId>) -> Self

Construct metadata for a given actor name and optional correlation id.

pub fn id(&self) -> EventId

Unique identifier for this envelope.

pub fn timestamp(&self) -> u64

Timestamp in nanoseconds since Unix epoch (u64 truncation).

pub fn actor_name(&self) -> &str

Name of actor that sent the event.

pub fn actor_id(&self) -> &ActorId

pub fn correlation_id(&self) -> Option<EventId>

Optional value of correlation data. It might by a parent event id, but it’s up to the user to define its meaning.

Trait Implementations

impl Clone for Meta

fn clone(&self) -> Meta

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Meta

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

Formats the value using the given formatter.