Configuration

The core is a codec, so there’s almost nothing to configure — the “wiring” is your own broker client plus a couple of optional behaviours.

Envelope options

EnvelopeCodec.Make takes the queue name (written to meta.queue) and an optional inbound trace id to continue across a hop:

using BabelQueue;

var env = EnvelopeCodec.Make(
    "urn:babel:orders:created",
    new Dictionary<string, object?> { ["order_id"] = 1042L },
    queue: "orders",
    traceId: inbound.TraceId); // omit to mint a fresh trace_id

Dead-letter

On failure, wrap the envelope in an additive dead_letter block and publish the copy to your dead-letter queue (e.g. orders.dlq):

var dlq = DeadLetters.Annotate(env, "failed", "orders", attempts: 3, error: "boom");
// publish EnvelopeCodec.Encode(dlq) to the "orders.dlq" queue

DeadLetters.Annotate returns a copy — the original envelope is preserved unchanged inside the dead-lettered message, so any-language consumer can still read it.

Unknown-URN strategy

For adapters routing inbound messages, UnknownUrnStrategy (Fail, Delete, Release, DeadLetter) describes what to do with a URN you don’t handle.

Next: Producing messages.