Struct ActivityStreamKey 

pub struct ActivityStreamKey {
    pub workflow_id: WorkflowId,
    pub run_id: RunId,
    pub activity_id: ActivityId,
    pub attempt: u32,
}

The durable key of one observability stream: a (workflow, run, activity, attempt) quad. Every ActivityRecord for one running agent attempt shares this key and is ordered by store_seq within it.

Why the run axis exists

A continue-as-new chain reuses one WorkflowId across generations, and BOTH of the remaining axes restart inside each new run: activity ordinals count from 0 again and attempts from 1. A (workflow, activity, attempt) key is therefore not unique across a chain — generation two’s first event would be appended onto generation one’s stream head, silently fusing two transcripts into one. The run is the axis that separates them, so it is a required component of the key with no None arm.

Fields

workflow_id: WorkflowId

The workflow the activity belongs to.

run_id: RunId

The concrete run of that workflow — the second key axis. Two generations of one continue-as-new chain are DISTINCT streams even when their (activity, attempt) coordinates coincide, which they routinely do.

activity_id: ActivityId

The activity within the workflow.

attempt: u32

The attempt number — the fourth key axis (NOI-0). Two attempts of one activity are DISTINCT streams; a within-attempt failover shares one stream (so a dying + adopting worker’s events dedupe), while a retry is a new attempt and therefore a new stream.

Implementations

impl ActivityStreamKey

pub const fn new( workflow_id: WorkflowId, run_id: RunId, activity_id: ActivityId, attempt: u32, ) -> Self

Build a stream key from its four components.

pub fn of(event: &ActivityEvent) -> Self

The stream key an ActivityEvent belongs to.

Trait Implementations

impl Clone for ActivityStreamKey

fn clone(&self) -> ActivityStreamKey

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ActivityStreamKey

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

Formats the value using the given formatter.

impl Eq for ActivityStreamKey

impl Hash for ActivityStreamKey

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for ActivityStreamKey

fn eq(&self, other: &ActivityStreamKey) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for ActivityStreamKey