Enum IdempotencyError 

pub enum IdempotencyError {
    StoreFull {
        capacity: usize,
    },
    Stale(StaleClaim),
    Unavailable {
        reason: &'static str,
    },
}

Why a claim could not be taken.

Variants

StoreFull

Every slot is held by a request that has not finished, and the key is new.

Finished results are evicted oldest-first to make room, so this means the store is full of work in progress. See CompletedResults::claim.

Fields

capacity: usize

The ceiling, in keys.

Stale(StaleClaim)

A claim was presented that no longer holds its key.

Unavailable

The store could not answer, for a reason of its own.

In the in-memory adapter that is a poisoned lock: some other caller’s panic unwound through it, and the state inside is no longer something this process can vouch for. The store refuses rather than guessing, because a wrong answer here means either a side effect that ran twice or a result handed to a caller that did not earn it.

It is a variant of its own rather than a StaleClaim because “your claim is too late” and “I cannot tell you anything” are different facts, and a caller can act on the first and only retry on the second.

Fields

reason: &'static str

What went wrong, in the adapter’s words.

Trait Implementations

impl Clone for IdempotencyError

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for IdempotencyError

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

Formats the value using the given formatter.

impl Display for IdempotencyError

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

Formats the value using the given formatter.

impl Eq for IdempotencyError

impl Error for IdempotencyError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<IdempotencyError> for DispatchError

fn from(error: IdempotencyError) -> Self

Keeps a poisoned or absent store from reading as an absent claim.

impl From<StaleClaim> for IdempotencyError

fn from(source: StaleClaim) -> Self

Converts to this type from the input type.

impl PartialEq for IdempotencyError

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for IdempotencyError