Struct EpochWithGap

pub struct EpochWithGap(pub(crate) u64);

Represents an epoch with a gap.

When a spill of the mem table occurs between two epochs, EpochWithGap generates an offset. This offset is encoded when performing full key encoding. When returning to the upper-level interface, a pure epoch with the lower 16 bits set to 0 should be returned.

Tuple Fields

0: u64

Implementations

impl EpochWithGap

pub fn new(epoch: u64, spill_offset: u16) -> Self

pub fn new_from_epoch(epoch: u64) -> Self

pub fn new_min_epoch() -> Self

pub fn new_max_epoch() -> Self

pub(crate) fn as_u64(&self) -> HummockEpoch

pub fn from_u64(epoch_with_gap: u64) -> Self

pub fn pure_epoch(&self) -> HummockEpoch

pub fn offset(&self) -> u64

Trait Implementations

impl Clone for EpochWithGap

fn clone(&self) -> EpochWithGap

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for EpochWithGap

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

Formats the value using the given formatter.

impl Default for EpochWithGap

fn default() -> EpochWithGap

Returns the “default value” for a type.

impl Hash for EpochWithGap

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 EpochWithGap

fn cmp(&self, other: &EpochWithGap) -> 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.

impl PartialEq for EpochWithGap

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for EpochWithGap

fn partial_cmp(&self, other: &EpochWithGap) -> 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 Copy for EpochWithGap

impl Eq for EpochWithGap

impl StructuralPartialEq for EpochWithGap