Struct RandomDrawProjection 

pub struct RandomDrawProjection { /* private fields */ }

The deterministic random() draw-ordinal projection for one run.

Bound to the run’s (WorkflowId, RunId), it reproduces — for any draw ordinal — the exact value the production determinism NIF serves, by calling the same deterministic_float / deterministic_i64 the NIF calls. Draw ordinals start at 0 (the first workflow.random() call a run makes draws ordinal 0), matching the handle’s pre-increment sequence counter.

This carries no draw count: the number of draws a run makes is workflow-code dependent and unrecoverable from history alone (module docs). It answers “what would random() return at ordinal n?”, never “how many draws did step k make?”.

Implementations

impl RandomDrawProjection

pub fn random_at(&self, ordinal: u64) -> f64

The f64 in [0.0, 1.0) workflow.random() returns at draw ordinal.

This is byte-for-byte the value the production random() NIF serves at that ordinal for this run — it calls the same deterministic_float.

pub fn random_int_at( &self, ordinal: u64, min: i64, max: i64, ) -> Result<i64, DurabilityError>

The i64 in [min, max] workflow.random_int(min, max) returns at draw ordinal.

This is the value the production random_int NIF serves at that ordinal for this run — it calls the same deterministic_i64.

Errors

Returns DurabilityError::HistoryShape when min > max, mirroring the NIF’s loud rejection of an inverted range (no silent clamping).

Trait Implementations

impl Clone for RandomDrawProjection

fn clone(&self) -> RandomDrawProjection

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RandomDrawProjection

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

Formats the value using the given formatter.

impl Eq for RandomDrawProjection

impl PartialEq for RandomDrawProjection

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for RandomDrawProjection