Posts

Below is an example of a Network Diagram that depicts a possible topology for our reservation system, illustrating firewalls, routers, subnets, and connections. It is designed to enhance network security and efficiency. graph TB %% Internet Internet[Internet] --> Firewall1[Firewall] %% Perimeter Network -DMZ subgraph DMZ[Perimeter Network -DMZ-] Router[Router] APIGateway[API Gateway] end Firewall1 --> Router Router --> APIGateway %% Internal Network subgraph InternalNetwork[Internal Network] LoadBalancer[Load Balancer] ApplicationServer1[App Server 1] ApplicationServer2[App Server 2] DatabaseServer[Database Server] EventBus[Wolverine Event Bus] end APIGateway --> LoadBalancer LoadBalancer --> ApplicationServer1 LoadBalancer --> ApplicationServer2 ApplicationServer1 --> DatabaseServer ApplicationServer2 --> DatabaseServer ApplicationServer1 --> EventBus ApplicationServer2 --> EventBus %% External Services subgraph ExternalServices[External Services] NotificationService[Notification Service] PaymentGateway[Payment Gateway] end EventBus --> NotificationService EventBus --> PaymentGateway Components Breakdown: Internet: ...

Below is an example of an Infrastructure Diagram that illustrates how our event-based reservation system might be deployed using cloud resources. This includes virtual machines, networks, containers, and external services. graph TD %% Cloud Platform subgraph CloudInfrastructure[Cloud Infrastructure -e.g., AWS, Azure, GCP-] LB[Load Balancer] VPC[VPC -Virtual Private Cloud-] subgraph AppLayer[Application Layer] EC2Instance1[Virtual Machine: Reservation Service Instance 1] EC2Instance2[Virtual Machine: Reservation Service Instance 2] Container1[Docker Container: Wolverine Event Bus] Container2[Docker Container: Durable Outbox] end subgraph DataLayer[Data Layer] DBCluster[Managed Database Cluster] BackupStorage[Cloud Backup Storage] end subgraph ExternalServices[External Integrations] PaymentGateway[Payment Gateway] NotificationService[Notification Service] ResourceCatalog[Resource Catalog API] end end %% Interactions LB --> EC2Instance1 LB --> EC2Instance2 EC2Instance1 --> Container1 EC2Instance2 --> Container2 EC2Instance1 --> DBCluster DBCluster --> BackupStorage Container1 --> PaymentGateway Container2 --> NotificationService EC2Instance1 --> ResourceCatalog Explanation of Components: Cloud Infrastructure: ...

Here’s an example of a Flowchart that represents a simple workflow for a reservation system, illustrating key steps in the booking process. graph TD Start[Start] --> EnterDetails[Customer Enters Reservation Details] EnterDetails --> CheckAvailability[Check Resource Availability] CheckAvailability -->|Available| ProceedPayment[Proceed with Payment] CheckAvailability -->|Not Available| DisplayError[Display Error Message] ProceedPayment --> ConfirmReservation[Confirm Reservation] ConfirmReservation --> SendNotification[Send Confirmation Notification] SendNotification --> End[End] Explanation of the Workflow: Start: The process begins when a customer initiates a reservation. Enter Details: The customer provides reservation details (e.g., date, time, resource). Check Resource Availability: The system verifies if the requested resource is available. If available, the workflow proceeds to payment. If not available, an error message is displayed to the customer. Proceed with Payment: The customer completes the payment process. Confirm Reservation: The system confirms the reservation after successful payment. Send Notification: A confirmation message (email/SMS) is sent to the customer. End: The workflow concludes.

Below is an example of a deployment diagram for our event-based reservation system. This shows how components of the system are deployed across servers, environments, and external services in a physical setup. You can use the following Mermaid code to visualize it in a Mermaid-enabled renderer: graph TD %% Deployment Nodes subgraph ClientMachine [Client Machine] FrontendApp[Reservation Frontend App] end subgraph AppServer [Application Server] ReservationService[Reservation Service] WolverineEventBus[Wolverine Event Bus] DurableOutbox[Durable Outbox] end subgraph Messaging [Messaging Infrastructure] MessageBroker[Message Broker] end subgraph DatabaseServer [Database Server] ReservationsDB[Reservations Database] CustomersDB[Customers Database] end subgraph ExternalServices [External Systems] PaymentGateway[Payment Gateway] NotificationService[Notification Service] ResourceCatalog[Resource Catalog Service] end %% Interactions FrontendApp --> ReservationService ReservationService --> WolverineEventBus WolverineEventBus --> DurableOutbox WolverineEventBus --> MessageBroker MessageBroker --> PaymentGateway MessageBroker --> NotificationService ReservationService --> ReservationsDB ReservationService --> CustomersDB ReservationService --> ResourceCatalog Explanation Nodes: ...

Here is a conceptual Entity-Relationship Diagram (ERD) for our conceptual reservation system. This diagram includes entities such as Customer, Reservation, and Resource, along with their attributes and relationships. erDiagram %% Customer Entity Customer { int Id string FullName string Email string Phone } %% Resource Entity Resource { int Id string Name string Description int Capacity } %% Reservation Entity Reservation { int Id int CustomerId int ResourceId DateTime StartDate DateTime EndDate string Status } %% Relationships Customer ||--o{ Reservation : "creates" Resource ||--o{ Reservation : "associated with" Explanation Entities: ...

Here’s an example of a Level-1 Data Flow Diagram (DFD) for our reservation system. It highlights how data moves between external entities, processes, and storage components. flowchart TD %% External Entities Customer[Customer] ResourceCatalog[Resource Catalog] PaymentGateway[Payment Gateway] NotificationService[Notification Service] %% Processes Process1[Submit Reservation] Process2[Check Resource Availability] Process3[Process Payment] Process4[Notify Customer] %% Data Stores D1[Reservation Data Store] D2[Customer Data Store] %% Data Flows Customer -->|Reservation Details| Process1 Process1 -->|Reservation Data| D1 Process1 -->|Customer Details| D2 Process1 -->|Resource Details| Process2 ResourceCatalog -->|Resource Availability| Process2 Process2 -->|Reservation Confirmation| Process1 Process1 -->|Payment Info| Process3 PaymentGateway -->|Payment Status| Process3 Process3 -->|Notification Request| Process4 Process4 -->|Notification| NotificationService Explanation External Entities: ...

Below is an example of a Mermaid diagram that shows a high-level context diagram for our event-based reservation system using Wolverine. In this diagram, you can see external actors (like customers, an administrator, payment gateway, etc.) interacting with internal components such as a Reservation Frontend, Reservation Service, and the Wolverine Event Bus responsible for handling events. flowchart LR %%External Actors Customer[Customer] PaymentGateway[Payment Gateway] NotificationService[Notification Service] Administrator[Administrator] ResourceCatalog[Resource Catalog] %%Internal System Components subgraph System [Reservation System] Frontend[Reservation Frontend] Service[Reservation Service] EventBus[Wolverine Event Bus] end %%Interactions between External Actors and the System Customer -->|Creates/Manages Booking| Frontend Frontend --> Service Service -->|Publishes Events| EventBus EventBus -->|Notifies| PaymentGateway EventBus -->|Notifies| NotificationService Service -->|Checks Availability| ResourceCatalog Administrator -->|Manages System| Service Explanation External Actors: ...

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: ...

Below is an example of a Mermaid class diagram representing the core classes for our event-based reservation system to visualize the relationships between the entities, services, and events. classDiagram %% Domain Entities class Customer { +int Id +string FullName +string Email } class Resource { +int Id +string Name +string Description } class Reservation { +int Id +int CustomerId +int ResourceId +DateTime StartDate +DateTime EndDate +ReservationStatus Status } %% Service Layer class ReservationService { +CreateReservation(customerId: int, resourceId: int, startDate: DateTime, endDate: DateTime) Reservation +CancelReservation(reservationId: int) bool } %% Domain Events class ReservationCreatedEvent { +Guid ReservationId +DateTime CreatedAt +int CustomerId } class ReservationCancelledEvent { +Guid ReservationId +DateTime CancelledAt +int CustomerId } %% Event Handling Component class ReservationEventHandler { +Handle(event: ReservationCreatedEvent) +Handle(event: ReservationCancelledEvent) } %% Associations Customer "1" --o "0..*" Reservation : creates Resource "1" --o "0..*" Reservation : assigned to ReservationService ..> ReservationCreatedEvent : publishes ReservationService ..> ReservationCancelledEvent : publishes ReservationEventHandler ..> ReservationCreatedEvent : handles ReservationEventHandler ..> ReservationCancelledEvent : handles %% Note: ReservationStatus is an enumeration (e.g., Pending, Confirmed, Cancelled) Explanation Domain Entities: ...

Here’s an example of a Business Event Flow Diagram tailored to a reservation system, illustrating how a typical business event (e.g., “Customer makes a reservation”) flows through the organization: flowchart TD %% Event Trigger Customer[Customer Initiates Reservation] --> SubmitRequest[Submit Reservation Request] SubmitRequest --> ValidateInputs[Validate Input Data] ValidateInputs -->|Valid| CheckAvailability[Check Resource Availability] ValidateInputs -->|Invalid| RejectRequest[Reject Request with Error] CheckAvailability -->|Available| ProcessReservation[Process Reservation] CheckAvailability -->|Not Available| NotifyUnavailability[Notify Customer of Unavailability] ProcessReservation --> CreateEvent[Create Business Event: ReservationCreated] CreateEvent --> NotifyCustomer[Send Confirmation Notification] CreateEvent --> UpdateDB[Update Reservation Database] NotifyCustomer --> End[End] UpdateDB --> End[End] NotifyUnavailability --> End[End] RejectRequest --> End[End] Key Elements: Event Trigger: The workflow begins when the customer initiates the reservation request. ...