> For the complete documentation index, see [llms.txt](https://www.pranaypourkar.co.in/the-programmers-guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.pranaypourkar.co.in/the-programmers-guide/system-design/system-design-methodology/diagrams/uml-diagrams/plantuml/architecture-diagram.md). # Architecture Diagram ## About An **Architecture Diagram** represents the **high-level structure of a system**, including **components, services, and their interactions**. In a **Distributed System**, it shows how components communicate across multiple nodes. {% hint style="success" %} Refer to the official documentation for more details - {% endhint %} #### **Key Elements** 1. **Nodes (Servers, Databases, Clients)** * Represent **physical or virtual machines** in the system. 2. **Microservices / Components** * Logical groupings of **functional modules** (e.g., Authentication, API Gateway). 3. **Communication Protocols** * Defines how components interact (e.g., REST, gRPC, Kafka). 4. **Load Balancers & Caches** * Used for **scalability and performance optimization**. 5. **External Dependencies** * Cloud services, third-party APIs, or message queues. ## 1. Web Application Deployment This represents a **Web Application Deployment** with multiple nodes (web server, app server, database). {% hint style="success" %} * **Nodes (`node "Name" { }`)**: Represents physical/virtual machines. * **Components (`[Component]`)**: Represents deployed components. * **Connections (`-->`)**: Shows data flow. {% endhint %} ```plant-uml @startuml title Web Application Deployment node "User" { [Browser] } node "Web Server" { [Nginx] } node "Application Server" { [Spring Boot App] } node "Database Server" { [PostgreSQL] } Browser --> Nginx : HTTP Request Nginx --> "Spring Boot App" : Forward Request "Spring Boot App" --> PostgreSQL : Query Data PostgreSQL --> "Spring Boot App" : Return Data "Spring Boot App" --> Browser : Render Response @enduml ```
## **2. Message Queue System** This represents **a microservice-based messaging system using RabbitMQ**. {% hint style="success" %} * **Nodes representing services and message queues**. * **Message flow (`-->`)**. {% endhint %} ```plant-uml @startuml title Message Queue System node "Producer Service" { [Order Service] } node "Message Queue" { [RabbitMQ] } node "Consumer Services" { [Inventory Service] [Shipping Service] } "Order Service" --> "RabbitMQ" : Publish Order Event "RabbitMQ" --> "Inventory Service" : Consume Order Event "RabbitMQ" --> "Shipping Service" : Consume Order Event @enduml ```
## **3. CI/CD Pipeline Diagram** This represents **a GitHub Actions CI/CD pipeline for deploying a microservice**. {% hint style="success" %} * **Stages of CI/CD pipeline**. * **Deployment flow (`-->`)** {% endhint %} ```plant-uml @startuml title CI/CD Pipeline - Microservice Deployment node "Developer" { [Push Code] } node "CI/CD Server" { [GitHub Actions] } node "Cloud Deployment" { [Docker Build] [Deploy to Kubernetes] } "Push Code" --> "GitHub Actions" : Trigger Build "GitHub Actions" --> "Docker Build" : Build Image "Docker Build" --> "Deploy to Kubernetes" : Deploy @enduml ```
## **4. Distributed System** This represents **a distributed system with load balancing, microservices, and databases**. ```plant-uml @startuml title Distributed System Architecture ' User interacts with the system node "User" { [Browser] [Mobile App] } ' Entry point for requests node "API Gateway" { [API gateway] } ' Load Balancer for backend services node "Load Balancer" { [Nginx] } ' Backend Microservices node "Backend Services" { [Auth Service] [Order Service] [Payment Service] [Notification Service] } ' Databases for storing data node "Databases" { [User DB] [Order DB] [Payment DB] } ' Caching Layer node "Cache" { [Redis] } ' Message Queue System for async processing node "Message Queue" { [Kafka] } ' External Services node "External APIs" { [Bank API] [Shipping API] } ' Connections Browser --> "API Gateway" : HTTP Request "Mobile App" --> "API Gateway" : API Call "API Gateway" --> Nginx : Route Request Nginx --> "Auth Service" : Authenticate "Auth Service" --> "User DB" : Fetch User Data "Auth Service" --> Redis : Cache Token Nginx --> "Order Service" : Process Order "Order Service" --> "Order DB" : Save Order "Order Service" --> "Message Queue" : Publish Event Nginx --> "Payment Service" : Handle Payment "Payment Service" --> "Payment DB" : Store Transaction "Payment Service" --> "Bank API" : Validate Payment "Message Queue" --> "Notification Service" : Order Update Event "Notification Service" --> "External APIs" : Notify User @enduml ```
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