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Lessons (11)

• Service Communication: Sync vs Async

  Should services call each other directly or talk through events? Compare request/response with messaging, orchestration with choreography …

• Why Kubernetes?

  … A 100-person orchestra needs a conductor : someone who makes sure every instrument starts on time, replaces a …

• Data in Microservices: Sagas & the Outbox Pattern

  … local transactions plus compensating actions, run by choreography (events) or orchestration (a coordinator). - Never dual-write. Use the …

• Domain-Driven Design: Tactical Patterns

  … via an outbox } } Domain service Application service --- --- --- Contains business rules? ✅ Yes ❌ No, only orchestration Knows about transactions, repositories …

• Event-Driven Architecture

  … error handling is spread out. Mediator topology (orchestration) A mediator (orchestrator) receives the initial event and directs the …

• Which Pattern Do I Need?

  … layer Command Message queues, CQRS commands Mediator Saga orchestrator Chain of Responsibility Middleware pipelines, API gateway filters Memento …

• Monolith vs Microservices

  … CI/CD, monitoring, tracing, orchestration The hidden costs ("the distributed systems tax") The 8 fallacies of distributed computing …

• Docker & Containers

  … scaling and zero-downtime deploys, you need an orchestrator , and that's Kubernetes (see the Kubernetes lessons). Key …

• Onion Architecture & Clean vs Hexagonal vs Onion

  … interfaces PricingService , IOrderRepository 🔵 Application services Use cases / workflows orchestrating the domain CheckoutService.placeOrder() 🟣 Outer ring: infrastructure, UI …

• Choosing an Architecture

  … order is placed" Event chains without visibility; add orchestration, tracing, an event catalog Teams constantly blocked by each …

• Behavioral Patterns II: Chain, Template, Iterator, Mediator, Memento, Visitor

  … components, an event bus, an API gateway, an orchestrator in a microservice saga. --- 5. Memento 💾 Analogy: Save points …