Struct Persistence 

pub struct Persistence { /* private fields */ }

Implementations

impl Persistence

pub fn new() -> AppResult<Self>

Creates a new persistence instance for storing key-value data.

This initializes the persistence layer, creating the config directory if needed, and loads existing state from disk if available.

Returns

Returns an AppResult<Self> containing the new Persistence instance.

Errors

Returns an error if the config directory cannot be created or accessed.

pub fn get(&self, key: &str) -> Option<&str>

Gets a value from the persistent state.

Arguments

• key - The key to look up

Returns

Returns Some(&str) if the key exists, None otherwise.

pub fn get_or<'a>(&'a self, key: &str, default: &'a str) -> &'a str

Gets a value from the persistent state, or returns the default if not found.

Arguments

• key - The key to look up
• default - The default value to return if key is not found

Returns

Returns the value if found, otherwise the default.

pub fn delete(&mut self, key: &str) -> bool

Deletes a key from the persistent state.

Marks the state as dirty if the key existed. Call flush() to save to disk.

Arguments

• key - The key to delete

Returns

Returns true if the key existed and was removed, false otherwise.

pub fn is_dirty(&self) -> bool

Returns true if there are unsaved changes.

pub fn len(&self) -> usize

Returns the number of stored key-value pairs.

pub fn is_empty(&self) -> bool

Returns true if no key-value pairs are stored.

pub fn clear(&mut self)

Clears all stored key-value pairs.

Marks the state as dirty. Call flush() to save to disk.

pub fn set(&mut self, key: &str, value: &str) -> AppResult<()>

Sets a value in the persistent state.

Marks the state as dirty. Call flush() to save to disk.

Arguments

• key - The key to set
• value - The value to store

Returns

Returns Ok(()) on success.

pub fn flush(&mut self) -> AppResult<()>

Forces an immediate save to disk if there are unsaved changes.

Returns

Returns Ok(()) on success.

Errors

Returns an error if saving fails.

Trait Implementations

impl Clone for Persistence

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Persistence

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

Formats the value using the given formatter.

impl Default for Persistence

fn default() -> Persistence

Returns the “default value” for a type.