Below is a Mermaid diagram that outlines a component diagram for your event-based reservation system using Wolverine. This diagram breaks down the core components and shows how they interact with each other and with external systems.
graph TD
%% External Systems
PG[Payment Gateway]
NS[Notification Service]
RC[Resource Catalog]
%% Reservation System Components
subgraph Reservation_System [Reservation System]
FE[Reservation Frontend]
RS[Reservation Service]
DO[Durable Outbox]
EB[Wolverine Event Bus]
EH[Event Handlers]
end
%% Internal Interactions
FE -->|User Requests| RS
RS -->|Persists Events/Commands| DO
RS -->|Publishes Events| EB
EB --> EH
RS -->|Checks Availability| RC
%% External Interactions via Event Bus
EB -->|Notifies| PG
EB -->|Notifies| NS
Explanation
Reservation System Components:
- Reservation Frontend (FE): The user interface where customers interact to create, update, or cancel reservations.
- Reservation Service (RS): Contains the core business logic including validating reservations, processing commands, and coordinating workflow.
- Durable Outbox (DO): Ensures events are reliably stored and delivered, supporting reliable messaging patterns.
- Wolverine Event Bus (EB): Serves as the backbone for asynchronous event routing within the system.
- Event Handlers (EH): These components process incoming events to perform actions such as updating read models, sending emails, or any other side-effects.
External Systems:
- Payment Gateway (PG) and Notification Service (NS): External services that receive events (for payment processing and notifications) published by the event bus.
- Resource Catalog (RC): External or internal component that provides resource availability information when required.
This diagram provides a clear, modular representation of your system, making it easier to understand the responsibilities of each component and how they communicate with both internal and external services.