Struct OperationIdGenerator 

pub struct OperationIdGenerator { /* private fields */ }

Generate deterministic operation IDs for durable operations.

Each OperationIdGenerator maintains a monotonically increasing counter. IDs are computed as blake2b(input) truncated to 64 hex characters, where input is "{counter}" for root operations or "{parent_id}-{counter}" for child operations.

Determinism Invariant

The same code path executing the same sequence of durable operations must produce the same operation IDs across replays. This is the fundamental correctness requirement for the replay engine.

Examples

use durable_lambda_core::operation_id::OperationIdGenerator;

let mut gen = OperationIdGenerator::new(None);
let id1 = gen.next_id();
let id2 = gen.next_id();

// IDs are deterministic — same counter produces same ID.
let mut gen2 = OperationIdGenerator::new(None);
assert_eq!(id1, gen2.next_id());
assert_eq!(id2, gen2.next_id());

// Different IDs for different counters.
assert_ne!(id1, id2);

Implementations

impl OperationIdGenerator

pub fn new(parent_id: Option<String>) -> Self

Create a new generator, optionally scoped under a parent operation.

• parent_id: None — root-level generator, hashes "{counter}"
• parent_id: Some(id) — child generator, hashes "{parent_id}-{counter}"

Examples

use durable_lambda_core::operation_id::OperationIdGenerator;

// Root-level generator.
let root = OperationIdGenerator::new(None);

// Child generator scoped to a parent operation.
let child = OperationIdGenerator::new(Some("abc123".to_string()));

pub fn next_id(&mut self) -> String

Generate the next deterministic operation ID.

Increments the internal counter and returns a 64-character hex string derived from blake2b hashing.

Examples

use durable_lambda_core::operation_id::OperationIdGenerator;

let mut gen = OperationIdGenerator::new(None);
let id = gen.next_id();
assert_eq!(id.len(), 64);

Trait Implementations

impl Clone for OperationIdGenerator

fn clone(&self) -> OperationIdGenerator

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for OperationIdGenerator

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

Formats the value using the given formatter.