Struct MatchedCounter 

pub struct MatchedCounter { /* private fields */ }

Turns successive SNAPSHOTS of a matched count into MatchedStatus reports — issue 1972. no_std, no allocation, eight bytes.

A backend that can count its matched peers but has no change counter of its own (zenoh’s graph cache; a DDS backend whose change counters are reset by other readers of the same status) feeds the current count here on every poll, and gets a report only when it moved.

total_count counts INCREASES SEEN between polls. A peer that leaves and another that joins between two polls nets to no change and is not counted; upstream’s DDS counter would count the join. A snapshot cannot do better, and saying so is the honest bound.

Implementations

impl MatchedCounter

pub const fn new() -> Self

A counter that has seen nothing matched yet.

pub const fn current(&self) -> u32

The last current_count observed.

pub fn observe(&mut self, current_now: u32) -> Option<MatchedStatus>

Record a snapshot of how many endpoints are matched now. Some with the report when the count moved, None when it did not.

Trait Implementations

impl Clone for MatchedCounter

fn clone(&self) -> MatchedCounter

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for MatchedCounter

impl Debug for MatchedCounter

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

Formats the value using the given formatter.

impl Default for MatchedCounter

fn default() -> MatchedCounter

Returns the “default value” for a type.

impl Eq for MatchedCounter

impl PartialEq for MatchedCounter

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for MatchedCounter