Enum AppendError 

pub enum AppendError {
    Conflict {
        expected: Position,
        actual: Position,
    },
    Fenced {
        scope: NamedNode,
        epoch: u64,
        highest: u64,
    },
    Unsupported(String),
    Invalid(String),
    Storage(StoreError),
}

Why a journal append wrote nothing.

Every variant means the same thing for the journal: none of the append’s entries, and none of its state changes, are visible to any later read.

Variants

Conflict

The actor’s journal is not at the expected position (compare-and-set failed).

Fields

expected: Position

The position the append expected.

actual: Position

The position the journal is actually at.

Fenced

The fencing token is older than the highest epoch the store has accepted for its scope.

Fields

scope: NamedNode

The scope of the token.

epoch: u64

The epoch the append carried.

highest: u64

The highest epoch accepted so far for the scope.

Unsupported(String)

The append carried a fencing token or a state delta, and the store does not support it (see crate::JournalCapabilities).

Invalid(String)

The entries are malformed (empty append, wrong graph, duplicate entry IRI, a term the store cannot hold).

Storage(StoreError)

The store failed; the transaction was rolled back.

Implementations

impl AppendError

pub fn is_conflict(&self) -> bool

True for AppendError::Conflict.

pub fn is_fenced(&self) -> bool

True for AppendError::Fenced.

Trait Implementations

impl Clone for AppendError

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 AppendError

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

Formats the value using the given formatter.

impl Display for AppendError

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

Formats the value using the given formatter.

impl Eq for AppendError

impl Error for AppendError

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<StoreError> for AppendError

fn from(e: StoreError) -> Self

Converts to this type from the input type.

impl PartialEq for AppendError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for AppendError