Enum Unknown 

pub enum Unknown {
    NotFetched,
    Deadline,
    Refused(String),
    Unresolvable(String),
    Unreachable(String),
}

Why a record’s value is not known.

Every variant is distinct from Answer::Absent, which is the repository having answered that it holds nothing at that key. This reader never collapses the two: a rule that refuses on absence would otherwise start refusing the moment somebody else’s server went down.

Variants

NotFetched

Nothing has fetched this record, so the cache holds no answer for it. What a read gets before its write’s prefetch has run, and again once an answer has aged out.

Deadline

The fetch did not finish inside its deadline.

Refused(String)

This reader will not fetch from there. Carries why.

Unresolvable(String)

There is no way to resolve that DID to a server.

Unreachable(String)

The repository did not answer, or answered with something other than a record.

Implementations

impl Unknown

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

A short word for a log line and a counter.

Trait Implementations

impl Clone for Unknown

fn clone(&self) -> Unknown

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Unknown

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

Formats the value using the given formatter.

impl PartialEq for Unknown

fn eq(&self, other: &Unknown) -> 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 Eq for Unknown

impl StructuralPartialEq for Unknown