Cooperative-Pixel-Art-CQRS-pattern-Event-Driven-Microservices

Assignment #6 - 20231124 - Event-Driven Microservices (Software Architecture and Platforms - a.y. 2023-2024)

• Description: The objective of the assignment is to see in practice the design and development of event-driven microservices, including the application of patterns such as Event Sourcing and CQRS. To this purpose:
  • Consider the Cooperative Pixel Art example (Lab-07-20231027). Implement an event-driven version composed by three services:
    • a simple API Gateway, that provides a REST API to Cooperative Pixel Art clients
    • a PixelGrid microservice, featuring an event-driven architecture
      • interacting with the API Gateway through event streams
      • exploiting Event Sourcing pattern for persistence
      • exploiting CQRS pattern to work with Dashboad/View microservice
    • a DashboardView microservice, that allows for querying/observing any PixelGrid
      • exploiting CQRS pattern, as a view aggregating events coming from PixelGrids
  • Further details
    • there could be multiple PixelGrids active at the same time, on different nodes, so that the API Gateway may need to interact with multiple PixelGrid microservices
      • every PixeGrid has its own unique name
    • there is only one DashboardView microservice
    • user client app interacts only with the API Gateway
      • a user can work on one or multiple pixel grids and can observe one or multiple pixel grids