Struct MemLog 

pub struct MemLog { /* private fields */ }

Primary in-memory implementation (also the dev/test runtime).

Implementations

impl MemLog

pub fn new() -> Self

Creates an empty in-memory log.

Trait Implementations

impl Default for MemLog

fn default() -> MemLog

Returns the “default value” for a type.

impl OpLog for MemLog

fn sync(&mut self) -> Result<(), LogError>

Nothing to do: a MemLog never outlives its process, so there is no weaker state for sync to strengthen. The default would serve; it is spelled out because “in-memory logs cannot be made durable” is the reason, not an oversight.

fn append(&mut self, entry: OpEntry) -> Result<ContentHash, LogError>

Appends entry and returns its content hash (the new head).

fn head(&self) -> Option<ContentHash>

Content hash of the newest entry, or None for an empty log.

fn len(&self) -> u64

Number of entries in the log.

fn get(&self, seq: u64) -> Option<OpEntry>

Entry at sequence number seq, or None if out of range.

fn last(&self) -> Option<&OpEntry>

Borrows the newest entry without cloning it.

fn is_empty(&self) -> bool

Whether the log has no entries.