Foundational messaging
The base channels and delivery guarantees every Art2link flow is built on. Get these right and the rest of the patterns compose cleanly on top.
These patterns define how a message travels across the bus and what promises the platform makes about delivery. Point-to-point and publish-subscribe are the two channel shapes; guaranteed delivery, the dead-letter channel, and the idempotent receiver are the guarantees that make at-least-once delivery safe.
Point-to-point channel. One producer, one consumer, delivered to the single matching subscriber.
Publish-subscribe channel. Publish once and the bus delivers a copy to every interested subscriber.
Guaranteed delivery. Once accepted a message is persisted and retried until acknowledged: at-least-once delivery.
Dead-letter channel. A persistent, inspectable home for messages that cannot be routed or delivered.
Idempotent receiver. A receiver that can process the same message twice with no additional effect.