Struct SimDevice 

pub struct SimDevice { /* private fields */ }

The shared log’s segment files on the simulated disk (wal/), or its blob area’s files (blob/, which grow by appends; a crash resolves their pending writes like any others’, independently of the log’s).

Trait Implementations

impl LogDevice for SimDevice

fn segments(&self) -> Result<Vec<u64>>

Segment numbers present, ascending.

fn len(&self, segment: u64) -> Result<u64>

fn read(&self, segment: u64, offset: u64, len: usize) -> Result<Vec<u8>>

Up to len bytes at offset, fewer at the end of the file.

fn create(&self, segment: u64, len: u64) -> Result<()>

Creates segment segment with len bytes, ready for overwrites, durably (file and directory entry).

fn write(&self, segment: u64, offset: u64, bytes: &[u8]) -> Result<()>

Writes at offset; durable only after sync.

fn sync(&self, segment: u64) -> Result<()>

fn rename(&self, from: u64, to: u64) -> Result<()>

Renames a segment file, durably.

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

fn prepare(&self, segment: u64, len: u64) -> Result<(), Error>

Like create, possibly in the background; any later operation on the segment waits for it.

fn is_ready(&self, _segment: u64) -> bool

Whether a prepared segment is ready: an operation on it now would not wait.