Struct Writer 

pub struct Writer {
    file: File,
}

Appends journal bytes to a file.

Each call to append writes the raw bytes and calls sync_data to ensure durability.

Fields

file: File

Implementations

impl Writer

pub async fn open(path: &Path) -> Result<Self>

Open (or create) a journal file for appending.

If the file does not exist a fresh header is written. If it already exists, new entries will be appended after the existing data.

Errors

Returns an I/O error if the file cannot be opened or the header cannot be written.

pub async fn append(&mut self, data: &[u8]) -> Result<()>

Append raw journal bytes and fsync.

Errors

Returns an I/O error if the write or sync fails.

pub async fn compact(&mut self, session: &InMemorySession) -> Result<()>

Rewrite the journal with a compact snapshot of the current session.

This replaces the entire file contents with store ops that reproduce the session’s current state, eliminating redundant history.

Errors

Returns an I/O error if the file cannot be truncated or written.

async fn write_header(&mut self) -> Result<()>