Struct StagingRegistry 

pub struct StagingRegistry { /* private fields */ }

Registry managing model versions and their lifecycle stages.

Models are keyed by (name, version) pairs. The registry enforces sequential stage transitions: Dev -> Staging -> Production for promotion, and the reverse for demotion.

Implementations

impl StagingRegistry

pub fn new() -> Self

Create an empty staging registry.

pub fn register_model( &mut self, name: &str, version: &str, path: &str, ) -> ModelVersion

Register a new model version at the Dev stage.

Panics

Does not panic. Returns the existing version if already registered (idempotent behavior for re-registration at the same key).

pub fn promote( &mut self, name: &str, version: &str, target: Stage, ) -> Result<ModelVersion>

Promote a model version to the given target stage.

The target must be exactly one stage above the current stage:

• Dev -> Staging
• Staging -> Production

Skipping stages (e.g., Dev -> Production) is rejected.

pub fn demote( &mut self, name: &str, version: &str, target: Stage, ) -> Result<ModelVersion>

Demote a model version to the given target stage.

The target must be exactly one stage below the current stage:

• Production -> Staging
• Staging -> Dev

Skipping stages (e.g., Production -> Dev) is rejected.

pub fn get_latest(&self, name: &str, stage: Stage) -> Option<&ModelVersion>

Get the latest version of a model at the given stage.

“Latest” is determined by created_at timestamp. Returns None if no version of the model exists at that stage.

pub fn list_versions(&self, name: &str) -> Vec<&ModelVersion>

List all versions of a model, sorted by creation time (oldest first).

Trait Implementations

impl Debug for StagingRegistry

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

Formats the value using the given formatter.

impl Default for StagingRegistry

fn default() -> StagingRegistry

Returns the “default value” for a type.