Enum Capability 

#[non_exhaustive]
pub enum Capability {
    ClaimForWorker,
    ClaimFromReclaim,
    SuspendResumeByCount,
    CancelExecution,
    CancelFlow,
    CancelFlowWaitTimeout,
    CancelFlowWaitIndefinite,
    StreamRead,
    StreamBestEffortLive,
    StreamDurableSummary,
    DeliverSignal,
    ListPendingWaitpoints,
    RotateWaitpointHmac,
    SeedWaitpointHmac,
    ReportUsage,
    ReportUsageAdminPath,
    ResetBudget,
    CreateFlow,
    CreateExecution,
    StageDependencyEdge,
    ApplyDependencyToChild,
    PreparableBoot,
    SubscribeLeaseHistory,
    SubscribeCompletion,
    SubscribeSignalDelivery,
    Ping,
}

Coarse-grained unit of functionality a backend may or may not provide. Granularity is one entry per operator-UI grey-renderable feature — not per trait method. See RFC-018 §9 Q1 for the owner adjudication (coarse, recommended by the draft).

#[non_exhaustive]: adding variants in future RFC-018 stages is a minor bump, not a break. Consumers matching on Capability must carry a wildcard arm.

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.

ClaimForWorker

Scheduler-routed claim entrypoint (EngineBackend::claim_for_worker).

ClaimFromReclaim

Consume a reclaim grant to mint a resumed-kind handle.

SuspendResumeByCount

Suspend + resume by buffered-signal count (RFC-013).

CancelExecution

Operator-initiated single-execution cancel.

CancelFlow

Operator-initiated flow cancel (no wait).

CancelFlowWaitTimeout

cancel_flow with CancelFlowWait::WaitTimeout(Duration) (#298 driver).

CancelFlowWaitIndefinite

cancel_flow with CancelFlowWait::WaitIndefinite.

StreamRead

read_stream (XRANGE-style bounded read).

StreamBestEffortLive

tail_stream (best-effort live tail).

StreamDurableSummary

Durable-summary frames + read_summary.

DeliverSignal

Deliver an external signal to a pending waitpoint.

ListPendingWaitpoints

List pending-or-active waitpoints for an execution.

RotateWaitpointHmac

Cluster-wide HMAC kid rotation.

SeedWaitpointHmac

Idempotent initial HMAC-secret seed (#280).

ReportUsage

Worker-handle-path report_usage.

ReportUsageAdminPath

Admin-path report_usage (no worker handle; #297 driver).

ResetBudget

Reset a budget’s usage counters.

CreateFlow

Create a flow header.

CreateExecution

Create an execution.

StageDependencyEdge

Stage a dependency edge.

ApplyDependencyToChild

Apply a staged dependency edge to its downstream child.

PreparableBoot

Backend honours EngineBackend::prepare with non-trivial work (e.g. Valkey FUNCTION LOAD).

SubscribeLeaseHistory

Subscribe to lease-epoch history for a handle.

SubscribeCompletion

Subscribe to completion notifications.

SubscribeSignalDelivery

Subscribe to signal-delivery notifications.

Ping

Backend-level reachability probe.

Trait Implementations

impl Clone for Capability

fn clone(&self) -> Capability

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Capability

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

Formats the value using the given formatter.

impl Hash for Capability

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 Ord for Capability

fn cmp(&self, other: &Capability) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Capability

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for Capability

fn partial_cmp(&self, other: &Capability) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for Capability

impl Eq for Capability

impl StructuralPartialEq for Capability