Struct Event 

pub struct Event {
    pub event_id: u64,
    pub source_event_id: Option<u64>,
    pub instance_id: String,
    pub execution_id: u64,
    pub timestamp_ms: u64,
    pub duroxide_version: String,
    pub kind: EventKind,
}

Unified event with common metadata and type-specific payload.

All events have common fields (event_id, source_event_id, instance_id, etc.) plus type-specific data in the kind field.

Events are append-only history entries persisted by a provider and consumed during replay. The event_id is a monotonically increasing position in history. Scheduling and completion events are linked via source_event_id.

Fields

event_id: u64

Sequential position in history (monotonically increasing per execution)

source_event_id: Option<u64>

For completion events: references the scheduling event this completes. None for lifecycle events (OrchestrationStarted, etc.) and scheduling events. Some(id) for completion events (ActivityCompleted, TimerFired, etc.).

instance_id: String

Instance this event belongs to. Denormalized from DB key for self-contained events.

execution_id: u64

Execution this event belongs to. Denormalized from DB key for self-contained events.

timestamp_ms: u64

Timestamp when event was created (milliseconds since Unix epoch).

duroxide_version: String

Crate semver version that generated this event. Format: “0.1.0”, “0.2.0”, etc.

kind: EventKind

Event type and associated data.

Implementations

impl Event

pub fn with_event_id( event_id: u64, instance_id: impl Into<String>, execution_id: u64, source_event_id: Option<u64>, kind: EventKind, ) -> Self

Create a new event with common fields populated and a specific event_id.

Use this when you know the event_id upfront (e.g., during replay or when creating events inline).

pub fn new( instance_id: impl Into<String>, execution_id: u64, source_event_id: Option<u64>, kind: EventKind, ) -> Self

Create a new event with common fields populated.

The event_id will be 0 and should be set by the history manager.

pub fn event_id(&self) -> u64

Get the event_id (position in history).

pub fn source_event_id(&self) -> Option<u64>

Get the source_event_id if this is a completion event. Returns None for lifecycle and scheduling events.

pub fn is_terminal(&self) -> bool

Check if this event is a terminal event (ends the orchestration).

Trait Implementations

impl Clone for Event

fn clone(&self) -> Event

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Event

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Event

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for Event

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for Event

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for Event

impl StructuralPartialEq for Event