Module subscription_router 

SubscriptionRouter — topic/type-based message routing with subscription management, filter evaluation, and delivery tracking.

Routes incoming RoutingMessages to registered Subscriptions using topic matching and filter evaluation. Deliveries are tracked in a bounded VecDeque-backed log.

Design highlights

• Topic matching: exact match or wildcard (*).
• Filter evaluation: composable SubscriptionFilter predicates.
• Delivery log: bounded at a configurable capacity; oldest entries are evicted when full.
• No unwrap(): all fallible operations surface errors explicitly.

Structs

DeliveryRecord

Audit record written whenever the router attempts delivery.

MessageTopic

Newtype wrapper for topic identifiers used by SubscriptionRouter.

RoutingMessage

A message travelling through SubscriptionRouter.

SubRouterStats

Point-in-time statistics snapshot for SubscriptionRouter.

Subscription

A subscriber registration in SubscriptionRouter.

SubscriptionRouter

Topic/type-based message routing engine.

Enums

SubscriptionFilter

A composable predicate for filtering RoutingMessages.

Functions

fnv1a_64

Compute an FNV-1a 64-bit hash over an arbitrary byte slice.