Struct FacePairTable 

pub struct FacePairTable { /* private fields */ }

Maps rx FaceId → tx FaceId for asymmetric link pairs (e.g., wfb-ng).

On symmetric faces (Udp, Tcp, Ethernet), Data is sent back on the same face an Interest arrived on. On asymmetric wfb-ng links, there is a separate transmit face — this table resolves which tx face to use.

The dispatch stage consults this table before sending Data:

let send_id = face_pairs.get_tx_for_rx(in_face_id).unwrap_or(in_face_id);
face_table.get(send_id)?.send(data).await;

Normal faces have no entry in this table (get_tx_for_rx returns None), so unwrap_or(in_face_id) falls through to the standard symmetric path.

Implementations

impl FacePairTable

pub fn new() -> Self

pub fn insert(&self, rx: FaceId, tx: FaceId)

Register an asymmetric link pair: Interests arrive on rx, Data is sent on tx.

pub fn get_tx_for_rx(&self, rx: FaceId) -> Option<FaceId>

Returns the tx face to use when Data should go back on rx_face. Returns None for symmetric faces.

pub fn remove(&self, rx: FaceId)

Remove the pair for rx.

pub fn len(&self) -> usize

pub fn is_empty(&self) -> bool

Trait Implementations

impl Default for FacePairTable

fn default() -> Self

Returns the “default value” for a type.