Sequence — Async Saga

Asynchronous messaging with timeouts and compensating actions.

PlantUMLUML & Software PlantUML syntax docs

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@startuml
!theme plain
skinparam backgroundColor transparent
participant Client
participant API
queue Bus
participant Payment
participant Inventory

Client -> API : POST /order
API -> Bus : OrderCreated
Bus -> Payment : ChargeCommand
Bus -> Inventory : ReserveCommand
Payment --> Bus : PaymentCaptured
Inventory --> Bus : StockReserved
Bus -> API : SagaComplete
API --> Client : 201 Created
note right of Bus
  If Payment fails:
    Bus → Inventory : ReleaseStock
    API → Client : 402
end note
@enduml