Module contracts 

User-facing Contract traits (Index, Backend, Aggregator, …). User-facing Contract traits — what a library maker implements when shipping a concrete component. The derives in bb-derive bridge these into the per-component dispatch_fn the engine holds.

Canonical home for bb-runtime. bb-dsl::contracts re-exports from here so the authoring path bb_dsl::Index keeps working.

Modules

aggregator

bb::Aggregator — Contract trait for federated aggregators.

backend

bb::Backend — Contract trait for tensor compute backends.

backend_default_walk

Shared default impls for the Backend Contract trait.

bootstrap

bb::Bootstrap — optional Component initialization phase.

codec

bb::Codec — bidirectional storage-type bridge.

data_source

bb::DataSource — Contract trait for data loaders.

index

bb::Index — Contract trait for vector indexes.

model

bb::Model — Contract trait for ML models.

peer_selector

bb::PeerSelector — Contract trait for peer-selection protocols.

Structs

BootstrapCtx

Per-dispatch context handed to a Component bootstrap. F5 will extend this with RuntimeResourceRef-style accessors so impls can stage outputs, allocate resources, or surface CompletionHandles for async work. Today the struct only carries the dispatching Component’s reference so impls have a stable identifier they can log against.

Enums

SelectParams

Parameters describing what peer set to select. Different concrete selectors handle the variants they support and return an error variant for the ones they don’t (e.g. GlobalRegistry supports Random + All; DhtView supports NearKey).

Traits

Aggregator

User-facing Contract trait for a federated/decentralized aggregator. The derive bridges these methods to the engine’s crate::roles::AggregatorRuntime trait.

Backend

User-facing Contract trait for a tensor compute backend.

Bootstrap

User-facing Contract trait for Component bootstrap. Default no-op means existing Components opt in by implementing the trait — the framework treats every Component as implicitly bootstrap-capable.

Codec

User-facing Contract trait for a typed in/out storage codec.

DataSource

User-facing Contract trait for a data source / data loader.

Index

User-facing Contract trait for a vector index.

Model

User-facing Contract trait for an ML model.

PeerSelector

User-facing Contract trait for a peer-selection protocol.