Struct Exponential 

pub struct Exponential { /* private fields */ }

Exponential backoff delay.

Each retry multiplies the delay by multiplier (default 2), capped at max (default 60s). Optional jitter applies ±25% random variation to each delay value.

Example

use std::time::Duration;
use retry::delay::{Delay, Exponential};

let mut d = Exponential::new(Duration::from_millis(100))
    .with_max(Duration::from_secs(2))
    .with_multiplier(2);

assert_eq!(d.next_delay(), Duration::from_millis(100));
assert_eq!(d.next_delay(), Duration::from_millis(200));
assert_eq!(d.next_delay(), Duration::from_millis(400));
assert_eq!(d.next_delay(), Duration::from_millis(800));
assert_eq!(d.next_delay(), Duration::from_millis(1600));
// capped at max
assert_eq!(d.next_delay(), Duration::from_secs(2));
assert_eq!(d.next_delay(), Duration::from_secs(2));

Implementations

impl Exponential

pub fn new(initial: Duration) -> Self

Creates a new exponential backoff starting with initial delay.

pub fn with_max(self, max: Duration) -> Self

Sets the maximum delay cap (default 60s).

pub fn with_multiplier(self, multiplier: u32) -> Self

Sets the multiplier applied to the delay after each retry (default 2).

pub fn with_jitter(self) -> Self

Enables ±25% random jitter on each delay value.

The actual delay will be uniformly distributed in the range [0.75 * delay, 1.25 * delay].

Trait Implementations

impl Clone for Exponential

fn clone(&self) -> Exponential

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Exponential

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

Formats the value using the given formatter.

impl Delay for Exponential

fn next_delay(&mut self) -> Duration

Returns the delay before the next retry attempt.