Enum ListenerHealth 

pub enum ListenerHealth {
    Pending,
    Healthy,
    Unhealthy,
}

What a channel can say about its own listener without performing any I/O.

See Channel::listener_health. The three states exist because a listener that has not connected yet and a listener that is working are different claims, and a caller that stamps “healthy” for both reports a channel as ok before it has ever reached the service.

Variants

Pending

No exchange has completed yet, so the channel has nothing to report. Not a failure — a listener that has only just started is not yet broken — but not evidence of health either.

Healthy

The most recent exchange succeeded, recently enough that it is still evidence the channel works.

Unhealthy

Either the most recent exchange failed, or the last success is old enough that the channel will no longer vouch for it. Both mean a live listen() is not proof the channel is working.

Trait Implementations

impl Clone for ListenerHealth

fn clone(&self) -> ListenerHealth

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ListenerHealth

impl Debug for ListenerHealth

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

Formats the value using the given formatter.

impl Eq for ListenerHealth

impl PartialEq for ListenerHealth

fn eq(&self, other: &ListenerHealth) -> 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 ListenerHealth