Struct Watermark 

pub struct Watermark(pub i64);

A watermark indicating event time progress.

Watermarks are monotonically increasing assertions that no events with timestamps earlier than the watermark will arrive. They are used to:

• Trigger window emissions
• Detect late events
• Coordinate time progress across operators

Example

use laminar_core::time::Watermark;

let watermark = Watermark::new(1000);

// Check if an event is late
assert!(watermark.is_late(999));  // Before watermark
assert!(!watermark.is_late(1000)); // At watermark
assert!(!watermark.is_late(1001)); // After watermark

Tuple Fields

0: i64

Implementations

impl Watermark

pub fn new(timestamp: i64) -> Self

Creates a new watermark with the given timestamp.

pub fn timestamp(&self) -> i64

Returns the watermark timestamp in milliseconds.

pub fn is_late(&self, event_time: i64) -> bool

Checks if an event is late relative to this watermark.

An event is considered late if its timestamp is strictly less than the watermark timestamp.

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

Returns the minimum (earlier) of two watermarks.

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

Returns the maximum (later) of two watermarks.

Trait Implementations

impl Clone for Watermark

fn clone(&self) -> Watermark

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Watermark

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

Formats the value using the given formatter.

impl Default for Watermark

fn default() -> Self

Returns the “default value” for a type.

impl From<Watermark> for i64

fn from(watermark: Watermark) -> Self

Converts to this type from the input type.

impl From<i64> for Watermark

fn from(timestamp: i64) -> Self

Converts to this type from the input type.

impl Hash for Watermark

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 Watermark

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

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

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

impl Eq for Watermark

impl StructuralPartialEq for Watermark