Below is an example of an Architecture Diagram for our event-driven reservation system, illustrating a microservices architecture. It highlights the relationships between components, external systems, and underlying patterns used.

Breakdown of the Diagram

  1. External Clients:

    • Customer Frontend: Allows users to create, cancel, or manage reservations.
    • Administrator Panel: Enables administrators to manage resources and oversee the system.
  2. Gateway Layer:

    • The API Gateway handles routing, authentication, and security. It forwards requests to the appropriate microservices in the service layer.
  3. Service Layer:

    • Reservation Service: Handles booking logic and validates reservations.
    • Resource Service: Provides data about available resources.
    • Notification Service: Manages notifications sent to customers about bookings or cancellations.
    • Payment Service: Processes payment transactions for confirmed reservations.
  4. Event Handling Layer:

    • The Wolverine Event Bus manages asynchronous communication between microservices and external systems, enabling decoupled processing and scalability.
  5. Data Layer:

    • Reservations Database: Stores reservation records.
    • Resources Database: Holds information about resources available for booking.
    • Customers Database: Maintains customer profiles and contact details.
  6. External Services:

    • Third-Party Notification System: Sends notifications via email, SMS, or other channels.
    • Third-Party Payment Gateway: Secures and processes payments for reservations.

Design Choices:

  • Microservices Architecture: Each service is independent, enabling modular development, scalability, and fault isolation.
  • Event-Driven Communication: Wolverine Event Bus decouples services, allowing asynchronous workflows and improving responsiveness.
  • Data Layer Separation: Different databases ensure focused, efficient querying and easier scalability for each dataset.
  • Gateway Layer: Centralized access management ensures secure and seamless interaction with clients.

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