Struct LoadBalancer 

pub struct LoadBalancer { /* private fields */ }

A weighted round-robin load balancer over an UpstreamPool.

Selection is lock-free and safe to call concurrently from multiple request handlers. The balancer never modifies backend health state; it only reads it.

Implementations

impl LoadBalancer

pub fn new(pool: UpstreamPool) -> Self

Creates a new round-robin balancer from the given upstream pool.

Builds a virtual slot table where each backend occupies a number of consecutive slots equal to its weight. For example, given backends [A(w=3), B(w=1)], the slot table is [0, 0, 0, 1].

pub fn next(&self) -> Result<UpstreamState>

Selects the next healthy upstream backend.

Advances the internal counter and walks through the slot table until a healthy backend is found. If no healthy backend exists after a full rotation, returns ProxyError::NoHealthyUpstream.

pub fn pool(&self) -> &UpstreamPool

Returns a reference to the underlying upstream pool.

Trait Implementations

impl Clone for LoadBalancer

fn clone(&self) -> LoadBalancer

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LoadBalancer

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

Formats the value using the given formatter.