Practical Eff monad for microservices
summary
An article microservice is built for merchant onboarding using component case classes for authentication, downstream clients and DB access, with dependency injection as readers auto-derived by grafter; tree rewriting via Kiama replaces low-level nodes with mocks, enforces singletons and tweaks thread pools for fast integration tests. Side effects and protocol are made explicit with the Eff monad (task, logged, reader/flow-id), using applicative concurrency, batching and memoization; safe effects ensure cleanup — result: fast delivery and much simpler, reliable tests.
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