Enum Reaction 

pub enum Reaction {
    Retry,
    EmptyState,
    Reconnect,
    Fallback,
    Diagnose,
}

How a CONSUMER must react to a raised facett UI error (Phase 2).

The shared reaction vocabulary: facett declares the CANONICAL reaction per code (in REGISTRY) so every consumer — korp, nornir, dwarves, holger — agrees on what a given failure means, and a consumer’s robot test asserts the REACTION (never a string match):

assert_eq!(reaction_for("korp/cases:facet-map-2"), Reaction::EmptyState);

A consumer may still choose a stricter local behaviour, but the canonical reaction is what the reaction-matrix tests pin — that is what makes ~150 (code × mount) assertions table-driven instead of hand-written.

Variants

Retry

Transient load failure — RETRY. The source/tile/fetch did not complete; the consumer re-attempts (with backoff) and shows a retry affordance.

EmptyState

No data — show an HONEST EMPTY STATE. Not a failure of the machinery: the query/selection genuinely has nothing. The consumer must NOT show a blank pane; it shows “nothing here” plus what would fill it.

Reconnect

Backend connection is down — offer RECONNECT. The consumer surfaces the disconnected state and a reconnect action; it must not pretend to show data.

Fallback

Degraded but FUNCTIONAL — inform, do not alarm. A fast path (GPU) is absent and a slower correct path took over. The consumer notes it in diagnostics; the UI keeps working.

Diagnose

Internal/compute failure — DIAGNOSE. A solver diverged, a layout did not converge, a raster produced nothing. The consumer records a diagnostic with the code and surfaces a “something is wrong here” state to the operator.

Implementations

impl Reaction

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

The stable machine token (state_json / test tables / the matrix slide).

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

A one-line description of what the consumer must actually do.

pub fn parse(s: &str) -> Option<Reaction>

Parse a reaction token (the inverse of token).

Trait Implementations

impl Clone for Reaction

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Reaction

impl Debug for Reaction

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Reaction

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for Reaction

impl Hash for Reaction

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Reaction

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for Reaction

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Reaction