Demo: keeping 120 stores selling when the central platform is down
On This Lesson 3 topics
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In this lesson
worked session designing offline store trading; prepares ARC-031-LAB1.
Draft outline details
Step by step
- List what a store needs to sell: product and price data, tax rules, payment, receipt, stock decrement.
- Design the store edge: local cache of catalog and prices, local queue of sales, card terminals with provider offline mode within limits.
- Define limits: maximum offline period and value, returns allowed or blocked, loyalty points deferred.
- Planned mistake: assume the store link is always up because it is redundant. Fix: treat "platform unreachable" as a normal scenario with a tested degraded mode.
- Design reconnection: replay the queue with idempotent sale IDs, reconcile stock and payments, and define resilience tests (cut the link in a pilot store).
Practice
Apply this lesson with the module's lab, exercises and quiz.
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