Enum ProjectionError 

#[non_exhaustive]
pub enum ProjectionError {
    SequenceBackward {
        last: u64,
        incoming: u64,
    },
    SequenceGap {
        last: u64,
        incoming: u64,
    },
    NotActive {
        state: ObserverState,
    },
    Storage(&'static str),
    DecodeFailed(&'static str),
    MissingRow,
}

Projection-side failure taxonomy.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

SequenceBackward

Event sequence moved backward (corruption or mis-routed dispatch).

Fields

last: u64

Last sequence applied by this projection.

incoming: u64

Sequence number of the rejected incoming event.

SequenceGap

A sequence number was skipped — the replay harness needs to fetch the missing range before this projection can advance.

Fields

last: u64

Last sequence applied by this projection.

incoming: u64

Sequence number of the event that exposed the gap.

NotActive

Caller attempted a mutation in a non-Active state (observer is Passive or Draining).

Fields

state: ObserverState

Observer state at the time of the attempted mutation.

Storage(&'static str)

Storage-layer error (in-memory corruption, PG driver, …).

DecodeFailed(&'static str)

Event payload failed to decode.

MissingRow

An event targeted an Actor / Space / Entry / Activity that the projection has no row for.

Trait Implementations

impl Debug for ProjectionError

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

Formats the value using the given formatter.

impl Display for ProjectionError

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

Formats the value using the given formatter.

impl Error for ProjectionError

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.