Struct Timers 

pub struct Timers {
    pub t1: Duration,
    pub t2: Duration,
    pub t4: Duration,
}

The three constants everything else is derived from.

Fields

t1: Duration

Round-trip estimate. The base of every backoff.

t2: Duration

Ceiling for retransmission intervals.

t4: Duration

Longest a message can linger in the network.

Implementations

impl Timers

pub fn timeout(&self) -> Duration

64·T1 — how long a transaction waits before giving up.

pub fn timer_d(&self, reliability: Reliability) -> Duration

Timer D: at least 32 s on an unreliable transport, nothing on a reliable one.

The RFC gives 32 s rather than a multiple of T1 because the purpose is to outlast response retransmissions from the other end, whose T1 we do not know.

pub fn absorb(&self, reliability: Reliability) -> Duration

Timer I and Timer K: T4 unreliable, zero reliable.

pub fn timer_j(&self, reliability: Reliability) -> Duration

Timer J: 64·T1 unreliable, zero reliable.

pub fn double(&self, current: Duration) -> Duration

The next retransmission interval, doubling without a ceiling — Timer A.

pub fn double_capped(&self, current: Duration) -> Duration

The next retransmission interval, doubling but capped at T2 — Timers E and G.

pub fn trying_100(&self) -> Duration

How long a server transaction waits before sending 100 Trying on its own initiative.

Trait Implementations

impl Clone for Timers

fn clone(&self) -> Timers

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Timers

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

Formats the value using the given formatter.

impl Default for Timers

fn default() -> Self

Returns the “default value” for a type.

impl Copy for Timers