Struct RealPersistentCacheIo 

pub struct RealPersistentCacheIo { /* private fields */ }

Real implementation of PersistentCacheIo writing to a temp directory. Each call performs temp write + fsync + rename + parent dir sync, which is the same crash-safe contract that production code already requires.

Implementations

impl RealPersistentCacheIo

pub fn new(dir: PathBuf) -> Result<Self>

Trait Implementations

impl PersistentCacheIo for RealPersistentCacheIo

fn write_atomic(&self, key: u64, frame: &[u8]) -> Result<(), IoError>

Atomically write frame for key (write to temp + fsync + rename + dir-sync). Errors are reported as IoError.

fn remove(&self, key: u64) -> Result<(), IoError>

Remove the persistent frame for key, if any. Missing files are OK.

fn clear(&self) -> Result<(), IoError>

Delete every persistent frame in this cache. Used by clear.

fn load(&self, key: u64) -> Result<Option<Vec<u8>>, IoError>

Read the persistent frame for key, if any. Missing files return Ok(None) so the loader can ignore absent entries.

fn exists(&self, key: u64) -> bool

Best-effort: check whether the on-disk frame for key exists.