Enum BandwidthClassSupportProbe 

pub enum BandwidthClassSupportProbe {
    AlwaysSupported,
    ForceForeground,
    Dynamic(Box<dyn Fn() -> bool + Send + Sync>),
}

Producer-side hook for the bandwidth-class downgrade decision.

Mirrors super::blob_tree::TreeSupportProbe / super::cdc::CdcSupportProbe / super::erasure::ErasureSupportProbe one-for-one — same enum shape, same default-impl, same dynamic-closure variant for runtime flag-driven decisions.

Behavior: callers pass a BandwidthClass alongside a probe; on probe.check() == false the substrate substitutes BandwidthClass::Foreground (the conservative choice — a Background-class request that lands on a non-D-aware peer is served as Foreground rather than failing). Foreground stays Foreground; Realtime degrades to Foreground (preserves liveness; gives up the rate-bypass that the legacy peer can’t honour anyway).

Variants

AlwaysSupported

All targets support the class hint. Default for single- cluster all-Phase-D deployments.

ForceForeground

No target supports the class hint. Forces every call to Foreground. Useful during cluster-wide rollouts.

Dynamic(Box<dyn Fn() -> bool + Send + Sync>)

Dynamic check — caller-supplied closure consults the capability-tag advertisement layer at decision time. Returns true iff the destination advertises DATAFORTS_BLOB_BANDWIDTH_CLASS_SUPPORTED.

Implementations

impl BandwidthClassSupportProbe

pub fn check(&self) -> bool

Evaluate the probe. Cheap for the static variants; invokes the closure for Dynamic.

Trait Implementations

impl Debug for BandwidthClassSupportProbe

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

Formats the value using the given formatter.

impl Default for BandwidthClassSupportProbe

fn default() -> BandwidthClassSupportProbe

Returns the “default value” for a type.