Enum RestartStrategy 

pub enum RestartStrategy {
    OneForOne,
    OneForAll,
    RestForOne,
    SimpleOneForOne,
}

One of the four canonical Erlang/OTP restart strategies.

The strategy decides what happens to sibling children when one child dies. Per-child behaviour is governed by RestartPolicy.

Variants

OneForOne

On child failure, restart only that child. Default; matches most “tree of independent workers” use cases.

OneForAll

On child failure, restart every child. Used when children share state and must be in sync.

RestForOne

On child failure, restart the failed child and every child started after it (preserving startup order). Used when later children depend on earlier ones.

SimpleOneForOne

Dynamic children of the same shape, started on demand. The supervisor doesn’t know its children at boot; they’re added as they’re needed (e.g. one child per session).

Implementations

impl RestartStrategy

pub const fn discriminant(&self) -> &'static str

Stable variant discriminant — auto-generated by #[derive(Discriminant)]. The string IS the wire identifier for metrics labels / audit-log tags / rate-limit keys; renaming an existing variant is a breaking change.

impl RestartStrategy

pub const fn is_one_for_one(&self) -> bool

pub const fn is_one_for_all(&self) -> bool

pub const fn is_rest_for_one(&self) -> bool

pub const fn is_simple_one_for_one(&self) -> bool

impl RestartStrategy

pub const ALL: &'static [Self]

Exhaustive iteration surface for every consumer that walks the closed four-arm RestartStrategy discriminator set (the future M4 mesh.pleme.io/v1alpha1/Supervisor CR materializer’s admission-webhook rejection body naming the accepted-:estrategia list, a future feira supervisor --estrategia … CLI arg-parse’s “did you mean” hint via a Self::from_wire-scan over the slice, the future feira app graph per-supervisor :estrategia column, any future round-trip fuzz harness that sweeps every arm). A future arm addition (an OTP-rest_for_all arm the theory ABSORPTION-ROADMAP might reach for once the four canonical OTP strategies stop covering the substrate’s discovered load-shape) extends this slice as one edit and every consumer picks up the new entry by construction; the compiler-checked exhaustiveness on the sibling method match arms (Self::as_str / Self::from_wire) is the build-time guarantee that no arm forgets to grow.

Peer of the sibling closed-set typed enums’ crate::CaixaKind::ALL (6b1f4fb) / crate::aplicacao::PlacementStrategy::ALL (18c7342) / crate::aplicacao::RateLimitUnit::ALL (6bce03d) / crate::dep::DepList::ALL (45ee563) exhaustive-iteration surfaces — the fifth (and the first M2 OTP-shape) closed-set typed enum on the caixa surface to converge onto the same one-canonical-arm-list-per-enum discipline.

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

Canonical PascalCase discriminator scalar this variant serializes as under crate::render::SUPERVISOR_KEY_ESTRATEGIA. The four arms return the paired crate::render::SUPERVISOR_ESTRATEGIA_ONE_FOR_ONE / crate::render::SUPERVISOR_ESTRATEGIA_ONE_FOR_ALL / crate::render::SUPERVISOR_ESTRATEGIA_REST_FOR_ONE / crate::render::SUPERVISOR_ESTRATEGIA_SIMPLE_ONE_FOR_ONE lifted constants so every substrate consumer that dispatches on the per-supervisor sibling-restart strategy (the future wasm-operator’s per-supervisor sibling-restart branch, the future M4 mesh.pleme.io/v1alpha1/Supervisor CR materializer’s admission-time enum-arm bind, the caixa-operator’s hierarchical reconciliation scheduler’s per-strategy fan-out) reads the same byte-string the Serialize derive emits — the pin test in [tests::restart_strategy_variants_serialize_to_lifted_scalar_values] asserts the two paths agree, peer of the M3 PlacementStrategy::as_str (cc8f749) on the sibling per-Aplicacao distribution-strategy axis.

pub fn from_wire(s: &str) -> Option<Self>

Substrate-canonical reverse projection on the :supervisor :estrategia closed-set axis — parses the PascalCase discriminator scalar back to the typed variant, or None when s is outside the closed-set arm-string set Self::as_str emits. Dispatches on the same lifted crate::render::SUPERVISOR_ESTRATEGIA_ONE_FOR_ONE / crate::render::SUPERVISOR_ESTRATEGIA_ONE_FOR_ALL / crate::render::SUPERVISOR_ESTRATEGIA_REST_FOR_ONE / crate::render::SUPERVISOR_ESTRATEGIA_SIMPLE_ONE_FOR_ONE constants the Self::as_str emitter walks, so the parse and emit halves of the round-trip migrate through one caixa-core edit on any future arm addition.

Prior to this lift the substrate carried only the forward Self → &str projection on the OTP sibling-restart axis (the Self::as_str emitter, the std::fmt::Display impl routed through it, the Serialize derive that emits the same byte-string under crate::render::SUPERVISOR_KEY_ESTRATEGIA) plus the kebab-case dispatcher-catalog identity via Self::discriminant — every non-serde consumer that wanted to parse a wire-form PascalCase strategy scalar had to re-inline a four-arm match s { "OneForOne" => …, "OneForAll" => …, "RestForOne" => …, "SimpleOneForOne" => …, _ => … } cascade that expressed no compile-time link back to the typed variant’s canonical lifted constant. A future variant rename or per-arm serde-attribute drift would silently split the wire byte-string one non-serde consumer parsed from the one the emitter wrote, with the failure surfacing at parse time far from the rebrand commit.

Distinct axis from the std::str::FromStr impl the gen_platform::FromStrKind derive already installs on this enum by design, not by drift: FromStr parses the kebab-case dispatcher-catalog identity ("one-for-one" / "one-for-all" / "rest-for-one" / "simple-one-for-one" — the inverse of Self::discriminant), while this method inverts the PascalCase wire byte-string Self::as_str emits. The two-axis split lets the dispatcher-catalog identity live in kebab-case (where every peer catalog identifier already lives) without forcing a wire-format rename on the tatara-lisp author surface (:estrategia OneForOne, PascalCase) — the same two-axis distinction the sibling crate::CaixaKind::from_wire (2aa6d23) / crate::aplicacao::PlacementStrategy::from_wire (18c7342) carry on their peer closed-set typed-enum wire round-trips.

Same closed-set-reverse-projection discipline the sibling crate::CaixaKind::from_wire (2aa6d23) / crate::aplicacao::PlacementStrategy::from_wire (18c7342) / crate::aplicacao::RateLimitUnit::from_suffix typed enums carry on the peer wire-side str → Self axes — extended onto the M2 OTP-shape sibling-restart-strategy closed-set axis, the fifth substrate-side closed-set typed enum to converge on the two-way str ↔ Self round-trip. Method-named from_wire (not from_str) to match the peer crate::CaixaKind::from_wire shape verbatim and side-step the std::str::FromStr impl the derive already installs on the sibling kebab-case axis. Returns Option<Self> (rather than Result<Self, _>) to match the peer shapes: the caller picks the diagnostic form appropriate for its use site.

Trait Implementations

impl Clone for RestartStrategy

fn clone(&self) -> RestartStrategy

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for RestartStrategy

impl Debug for RestartStrategy

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

Formats the value using the given formatter.

impl Default for RestartStrategy

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for RestartStrategy

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for RestartStrategy

std::fmt::Display routed through RestartStrategy::as_str, so the pretty-printed byte-string every consumer that formats the strategy as user-facing text lands on (the future wasm-operator’s per-supervisor sibling-restart-strategy diagnostic line, the future feira app graph per-supervisor strategy line, the future M4 mesh.pleme.io/v1alpha1/Supervisor CR materializer’s admission-webhook rejection body) reaches for the same lifted crate::render::SUPERVISOR_ESTRATEGIA_ONE_FOR_ONE / crate::render::SUPERVISOR_ESTRATEGIA_ONE_FOR_ALL / crate::render::SUPERVISOR_ESTRATEGIA_REST_FOR_ONE / crate::render::SUPERVISOR_ESTRATEGIA_SIMPLE_ONE_FOR_ONE const the wire-format Serialize derive already emits under crate::render::SUPERVISOR_KEY_ESTRATEGIA and the RestartStrategy::as_str helper already returns.

Pre-convergence the two paths structurally disagreed — the #[derive(gen_platform::Discriminant)] + #[discriminant(also_display)] route (now retired here) sent std::fmt::Display through the gen-platform discriminant catalog string, which arrives kebab-case as "one-for-one" / "one-for-all" / "rest-for-one" / "simple-one-for-one", while the wire format ran as PascalCase "OneForOne" / "OneForAll" / "RestForOne" / "SimpleOneForOne" through the un-renamed serde derive. Every consumer that formatted the strategy for a diagnostic line, a graph, or a rejection body under format!("{v}") therefore landed under a different byte-string than the wire format the operator’s per-strategy dispatch keyed off — a silent split whose apply-time symptom (a format!("{v}")-carrying diagnostic quoting "one-for-one" while the wire scalar the operator probed was "OneForOne") surfaced as a confused correlate at operator-log time far from the two-declaration site.

Routing Display through RestartStrategy::as_str closes the third path: every format!("{v}") call reaches the same lifted [crate::render::SUPERVISOR_ESTRATEGIA_*] const the wire format and the RestartStrategy::as_str helper route through — Debug (the compiler-derived variant name), Display (via as_str), and Serialize (via the un-renamed derive) all resolve to the same PascalCase byte-string per variant. A future variant rename or #[serde(rename_all = "kebab-case")] attribute reaches every path at exactly one place, structurally.

The dispatcher-catalog identity remains kebab-case — Self::discriminant (from #[derive(gen_platform::Discriminant)]) still returns "one-for-one" / etc., and the fleet-wide [gen_platform::register_dispatcher!("caixa.restart-strategy", …)] registration keys the catalog off the same kebab identity. The two naming worlds now live on separate typed methods (Display / as_str for the wire byte-string, discriminant for the catalog identity) rather than sharing one Display route that structurally disagrees with the wire format.

Pin tests [tests::restart_strategy_display_routes_through_as_str_helper] and [tests::restart_strategy_display_matches_serialized_wire_byte_string] assert the three paths agree byte-for-byte on every variant, so a future variant rename or per-arm serde attribute drift is a build error visible at caixa-core test time, not a silent per-consumer dispatch miss at apply / reconcile time.

Mirrors the M3 crate::aplicacao::PlacementStrategy Display impl (aplicacao.rs:2306) on the sibling per-Aplicacao distribution-strategy axis — same three-path-convergence discipline, extended to close the second of three OTP-shaped closed-enum discriminator axes on the caixa typed surface.

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

Formats the value using the given formatter.

impl Eq for RestartStrategy

impl FromStr for RestartStrategy

type Err = RestartStrategyParseError

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type.

impl Hash for RestartStrategy

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 RestartStrategy

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for RestartStrategy

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 RestartStrategy

impl TypedDispatcher for RestartStrategy

fn variant_kinds() -> Vec<&'static str>

Kebab-case serde tags of every variant in declaration order. Used by substrate emitters (Nix helpers skeleton, Lisp catalog, coverage tests) to enumerate the variant universe.

fn variant_fields() -> Vec<(&'static str, Vec<&'static str>)>

Field names per variant, paired with the variant’s kebab-case tag. Used by substrate emitters to produce the matching inherit (variant) <fields> Nix patterns.

fn variant_count() -> usize

Total variant count. Convenience for coverage assertions.