Struct raftlog::log::LogPosition

pub struct LogPosition {
    pub prev_term: Term,
    pub index: LogIndex,
}

ログの特定位置を識別するためのデータ構造.

Fields

prev_term: Term

一つ前のインデックスのエントリのTerm.

index: LogIndex

この位置のインデックス.

Methods

impl LogPosition

pub fn is_newer_or_equal_than(&self, other: LogPosition) -> bool

selfがログ上で、otherと等しい、あるいは、より後方に位置している場合にtrueが返る.

なおselfとotherが、それぞれ分岐したログ上に位置しており、 前後関係が判断できない場合にはfalseが返される.

Examples

use raftlog::log::LogPosition;

// `a`の方がインデックスが大きい
let a = LogPosition { prev_term: 10.into(), index: 5.into() };
let b = LogPosition { prev_term: 10.into(), index: 3.into() };
assert!(a.is_newer_or_equal_than(b));
assert!(!b.is_newer_or_equal_than(a));

// `a`の方が`Term`が大きい
let a = LogPosition { prev_term: 20.into(), index: 3.into() };
let b = LogPosition { prev_term: 10.into(), index: 3.into() };
assert!(a.is_newer_or_equal_than(b));
assert!(!b.is_newer_or_equal_than(a));

// `a`の方がインデックスは大きいが、`b`の方が`Term`は大きい
// => 順序が確定できない
let a = LogPosition { prev_term: 5.into(), index: 10.into() };
let b = LogPosition { prev_term: 10.into(), index: 3.into() };
assert!(!a.is_newer_or_equal_than(b));
assert!(!b.is_newer_or_equal_than(a));

Trait Implementations

impl Clone for LogPosition

fn clone(&self) -> LogPosition

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Copy for LogPosition

impl Debug for LogPosition

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

Formats the value using the given formatter.

impl Default for LogPosition

fn default() -> LogPosition

Returns the "default value" for a type.

impl Eq for LogPosition

impl Hash for LogPosition

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, 

Feeds a slice of this type into the given [Hasher].

impl PartialEq<LogPosition> for LogPosition

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=.

impl StructuralEq for LogPosition

impl StructuralPartialEq for LogPosition