VMO Microservice Food Ordering System

Generate Graph: mvn com.github.ferstl:depgraph-maven-plugin:4.0.1:aggregate -DcreateImage=true -Dscope=compile " -Dincludes=com.food.ordering.system*:*"

What I apply?

• Hexagonal (Clean) Architecture -> Port & Adapter Style
• Domain Driven Design (DDD)
• SAGA Pattern : process & rollback ( compensating transactions ) - Using Choreography
• Relational Database : for ACID and distributed transactional
• Kafka Messaging Systems for CQRS design and Microservices Communication
• (Ongoing) Outbox Pattern : Pulling Outbox Table With Scheduler , Saga Status
  • Cover Failure Scenarios :
    • Ensure idempotency using outbox table in each service
    • Prevent concurrency issues with optimistic looks & DB constraints
    • Kepp updating saga and order status for each operation

Order Service

Domain Event

Domain Service

Application Service

1. Implementing Domain Events in Order Service domain layer

Question?

Where to fire the event ? --> In Application Service. Domain Layer should not know about how to fire the event.

Where to create the event ? --> Domain Service or Entities