Struct Persistence 

pub struct Persistence { /* private fields */ }

Handles disk I/O for the MemStore.

Persistence uses an atomic “write-then-rename” strategy to ensure data integrity. Each persona is stored in its own .json file.

Implementations

impl Persistence

pub fn new<P: AsRef<Path>>(dir: P) -> Result<Self>

Initializes a new Persistence handler in the specified directory.

If the directory does not exist, it will be created.

pub fn save_persona( &self, persona_id: &str, data: &HashMap<String, HashMap<String, Value>>, ) -> Result<()>

Writes a single persona’s data to a JSON file atomically.

This method writes to a temporary file first and then renames it to the final destination, preventing file corruption during power failures.

pub fn load_all( &self, ) -> Result<HashMap<String, HashMap<String, HashMap<String, Value>>>>

Loads all persona data found in the data directory.

Scans for all .json files in the data_dir and parses them into the store’s internal data structure.