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.
flowchart TB
%% External Clients
Customer[Customer Frontend]
Admin[Administrator Panel]
%% Gateway Layer
subgraph Gateway[API Gateway]
GatewayService[Routing & Security]
end
%% Service Layer
subgraph ServiceLayer[Service Layer]
ReservationService[Reservation Service]
ResourceService[Resource Catalog Service]
NotificationService[Notification Service]
PaymentService[Payment Service]
end
%% Event Handling Layer
subgraph EventLayer[Event Handling Layer]
EventBus[Wolverine Event Bus]
end
%% Data Layer
subgraph DataLayer[Data Layer]
ReservationDB[Reservations Database]
ResourceDB[Resources Database]
CustomerDB[Customers Database]
end
%% External Services
ExternalNotification[Third-Party Notification System]
ExternalPaymentGateway[Third-Party Payment Gateway]
%% Interactions
Customer --> GatewayService
Admin --> GatewayService
GatewayService --> ReservationService
GatewayService --> ResourceService
ReservationService --> ReservationDB
ResourceService --> ResourceDB
ReservationService --> CustomerDB
ReservationService --> EventBus
EventBus --> NotificationService
EventBus --> PaymentService
NotificationService --> ExternalNotification
PaymentService --> ExternalPaymentGateway
Breakdown of the Diagram
External Clients:
- Customer Frontend: Allows users to create, cancel, or manage reservations.
- Administrator Panel: Enables administrators to manage resources and oversee the system.
Gateway Layer:
- The API Gateway handles routing, authentication, and security. It forwards requests to the appropriate microservices in the service layer.
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.
Event Handling Layer:
- The Wolverine Event Bus manages asynchronous communication between microservices and external systems, enabling decoupled processing and scalability.
Data Layer:
- Reservations Database: Stores reservation records.
- Resources Database: Holds information about resources available for booking.
- Customers Database: Maintains customer profiles and contact details.
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.