Pattern 52 / CONSISTENCY

Inbox Pattern

Use this when Processing incoming messages exactly once from the consumer perspective.

Pressure
Processing incoming messages exactly once from the consumer perspective
Mechanism
Record message ids before or during handling so retries can be safely ignored
Toll
Consumer storage and idempotency logic become part of the contract
Architecture plate52
Diagram for Inbox Pattern
Executive brief

Inbox Pattern fits when Processing incoming messages exactly once from the consumer perspective. Mechanism: Record message IDs before or during handling so retries can be safely ignored. Use it for Payments, shipment updates, webhook consumers, event projections. The toll: Consumer storage and idempotency logic become part of the contract.

Use when

Payments, shipment updates, webhook consumers, event projections.

Example

Use inbox pattern when payments, shipment updates, webhook consumers, event projections..

Review framing

Describe the pressure first, then the mechanism, then the cost. That keeps the design grounded.

Same pressure family

Consistency / Messaging

51Outbox Pattern53Transactional Messaging
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