Enum BackpressureStrategy 

pub enum BackpressureStrategy {
    Drop,
    Block,
    FallbackSink(Arc<dyn AuditSink>),
}

SP-observability-completeness-v1 Axis B. How a sink behaves when its internal queue is full at on_call time.

Variants

Drop

Drop the event, increment drops(). The SP-concurrency-baseline default — protects dispatch throughput; correct for the 90% non-compliance case. “log loss >> dispatch stall.”

Block

Block the dispatch path until the queue accepts the event. For compliance adopters (HIPAA §164.528) where a dropped audit record is unacceptable: dispatch slows under audit backpressure rather than losing the disclosure record. Requires a multi-thread runtime (the ref binaries use one) so a blocked worker doesn’t starve accept.

FallbackSink(Arc<dyn AuditSink>)

On queue-full, write the event synchronously to a fallback sink (e.g. stderr / a second file) instead of dropping. Bounds the hot path (no indefinite block) with no silent loss. The fallback SHOULD be a synchronous sink, never another queueing sink (avoid chained blocking).

Trait Implementations

impl Clone for BackpressureStrategy

fn clone(&self) -> BackpressureStrategy

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for BackpressureStrategy

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

Formats the value using the given formatter.