Struct Barrier 

pub struct Barrier(/* private fields */);

A monotonic ordering point, handed out by a SyncJournal on every successful sync.

It is a sequence number, not a clock: it says what happened before what, which is all a crash model needs, and it never goes backwards when the system clock does.

let journal = SyncJournal::complete();
let first = journal.record("a.db", SyncKind::File, None);
let second = journal.record("b.db", SyncKind::File, None);
assert!(first < second);
assert_eq!(Barrier::new(0), Barrier::new(0));

Implementations

impl Barrier

pub const fn new(seq: u64) -> Self

Build a barrier from a raw sequence number.

You need this only when implementing DurabilityWitness by hand; SyncJournal hands out its own.

assert_eq!(Barrier::new(7).seq(), 7);

pub const fn seq(self) -> u64

The raw sequence number.

assert_eq!(Barrier::new(42).seq(), 42);

Trait Implementations

impl Clone for Barrier

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Barrier

impl Debug for Barrier

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

Formats the value using the given formatter.

impl Display for Barrier

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

Formats the value using the given formatter.

impl Eq for Barrier

impl Hash for Barrier

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Barrier

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

🔬This is a nightly-only experimental API. (clamp_to)

Restrict a value to a certain range.

impl PartialEq for Barrier

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl PartialOrd for Barrier

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for Barrier