Struct SnapshotKey 

pub struct SnapshotKey {
    pub task: String,
    pub group: String,
    pub epoch: i64,
}

Names one stored snapshot: the task, the barrier group, and the epoch.

The cut identity lives here and not in the container, so two barrier groups and two epochs never share a snapshot.

Fields

task: String

The task the snapshot belongs to, as <subtopology>-<partition>.

group: String

The barrier group whose cut the task aligned on.

epoch: i64

The epoch of that cut.

Implementations

impl SnapshotKey

pub fn new( task: impl Into<String>, group: impl Into<String>, epoch: i64, ) -> Self

Builds a key for one task, group, and epoch.

pub fn file_name(&self) -> String

The file name that the file-backed snapshot store gives this key.

Every character outside A-Z, a-z, 0-9, ., _, and - becomes an underscore, so a group name or a task name can never escape the directory.

Trait Implementations

impl Clone for SnapshotKey

fn clone(&self) -> SnapshotKey

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SnapshotKey

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

Formats the value using the given formatter.

impl Eq for SnapshotKey

impl Hash for SnapshotKey

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 SnapshotKey

fn cmp(&self, other: &SnapshotKey) -> 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 SnapshotKey

fn eq(&self, other: &SnapshotKey) -> 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 SnapshotKey

fn partial_cmp(&self, other: &SnapshotKey) -> 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 SnapshotKey