Struct Clock 

pub struct Clock { /* private fields */ }

A millisecond clock that only moves when it is told to.

Implementations

impl Clock

pub fn system() -> Clock

A clock that follows the system, read once now.

pub const fn fixed(ms: u64) -> Clock

A clock that reads ms until somebody moves it.

pub const fn now_ms(&self) -> u64

The current reading, in milliseconds since the unix epoch.

pub fn refresh(&mut self)

Take a new reading, which a system clock does from the operating system and a fixed clock does not do at all.

Called once per turn of the shard loop, from the maintenance slice.

pub const fn set(&mut self, ms: u64)

Move the clock to ms by hand.

On a system clock the next Clock::refresh will overwrite this, so it is only meaningful on a fixed one.

pub const fn advance(&mut self, ms: u64)

Move a clock forward by ms.

pub fn fine_now_ms() -> u64

Read the operating system’s clock right now.

A time before the unix epoch reads as zero rather than failing. There is nothing useful a database can do about a machine whose clock says 1969, and every key expiring immediately is a more honest outcome than a panic on a path that has no error to return.

Trait Implementations

impl Clone for Clock

fn clone(&self) -> Clock

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Clock

impl Debug for Clock

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

Formats the value using the given formatter.

impl Default for Clock

fn default() -> Clock

Returns the “default value” for a type.