Trait Storage 

pub trait Storage: Send + Sync {
    // Required methods
    fn save_trial(
        &self,
        study_name: &str,
        trial: &Trial,
    ) -> Result<(), StorageError>;
    fn load_trials(&self, study_name: &str) -> Result<Vec<Trial>, StorageError>;
    fn save_study_metadata(
        &self,
        meta: &StudyMetadata,
    ) -> Result<(), StorageError>;
    fn load_study_metadata(
        &self,
        study_name: &str,
    ) -> Result<Option<StudyMetadata>, StorageError>;
}

Where a study’s trial history lives.

Abstracting this keeps crate::Study agnostic to whether history is a Vec in memory or rows in SQLite. Backends must be Send + Sync so a study can be optimized in parallel; they are expected to use interior mutability (all methods take &self) and upsert trials by (study, trial number).

Required Methods

fn save_trial( &self, study_name: &str, trial: &Trial, ) -> Result<(), StorageError>

Insert or update a trial for the given study.

fn load_trials(&self, study_name: &str) -> Result<Vec<Trial>, StorageError>

Load all trials for a study, in trial-number order. Returns an empty vec for a study that exists but has no trials yet.

fn save_study_metadata(&self, meta: &StudyMetadata) -> Result<(), StorageError>

Insert or update study-level metadata.

fn load_study_metadata( &self, study_name: &str, ) -> Result<Option<StudyMetadata>, StorageError>

Fetch study-level metadata, or None if the study is unknown.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl Storage for InMemoryStorage

impl Storage for SqliteStorage