Struct Journal 

pub struct Journal { /* private fields */ }

Deltas for versions tail + 1 ..= head.

Implementations

impl Journal

pub fn new() -> Journal

An empty journal at version zero.

pub fn head(&self) -> u64

The newest version.

pub fn tail(&self) -> u64

The oldest version still replayable from.

pub fn push(&mut self, ops: Vec<PlannedOp>) -> u64

Append a delta, returning the version it became.

Evicts from the front past DEPTH, which is the only thing that moves the tail.

pub fn replay( &self, from: u64, to: u64, ) -> Result<Vec<&PlannedOp>, TooFarBehind>

Every operation in versions from + 1 ..= to, in order.

Errors

TooFarBehind when from is below the tail. A to above the head, or a to below from, yields nothing: both mean the caller is already up to date or ahead, which is not an error a connection can act on.

Trait Implementations

impl Debug for Journal

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

Formats the value using the given formatter.

impl Default for Journal

fn default() -> Journal

Returns the “default value” for a type.