Enum CircuitState 

pub enum CircuitState {
    Closed {
        failure_count: u32,
        success_count: u32,
    },
    Open {
        opened_at: u64,
        retry_after_us: u64,
    },
    HalfOpen {
        probe_count: u32,
        success_count: u32,
    },
}

Three-state circuit breaker state machine.

All timestamps are in microseconds; the caller is responsible for supplying a monotonically increasing current_ts — the implementation never reads the system clock.

Variants

Closed

Normal operation. All requests pass through and every result is counted.

Fields

failure_count: u32

Number of failures recorded in the current rolling window.

success_count: u32

Number of successes recorded in the current rolling window.

Open

Circuit tripped. All requests are immediately rejected until opened_at + retry_after_us.

Fields

opened_at: u64

Timestamp (µs) at which the circuit was opened.

retry_after_us: u64

Microseconds to wait before transitioning to CircuitState::HalfOpen.

HalfOpen

Recovery-probe phase. A limited number of probe requests are allowed through to test whether the upstream service has recovered.

Fields

probe_count: u32

Number of probe requests currently in flight or completed in this phase.

success_count: u32

Number of probes that succeeded in the current HalfOpen phase.

Implementations

impl CircuitState

pub fn label(&self) -> &'static str

Returns a human-readable label used in CircuitMetrics.

Trait Implementations

impl Clone for CircuitState

fn clone(&self) -> CircuitState

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CircuitState

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

Formats the value using the given formatter.

impl PartialEq for CircuitState

fn eq(&self, other: &CircuitState) -> 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 StructuralPartialEq for CircuitState