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Discover how to model and validate OrderService → PaymentService interactions with UML sequence diagrams, check real call order with logs, and understand when async messaging can break the model.
Combined fragments let you model branching and looping in a single UML sequence diagram. This blog explains the core fragment types, shows a PlantUML example for a payment API, discusses trade‑offs, and gives actionable steps to adopt the pattern.
Goal Model retry logic in an activity diagram while ensuring that write operations are not duplicated across attempts. Constraint The diagram must represent a retry mechanism that updates a counter or condition atomically with the write action, preserving idempotency. Unresolved Decision The UML 2.5 specification does not prescribe a standard pattern for ret