System Architecture Design

Choose and design appropriate system architectures including client-server and layered patterns.

System Architecture Design

System architecture defines the high-level structure of a software system, including its components, their relationships, and the principles governing its design and evolution. Choosing the right architecture is critical for system performance, scalability, and maintainability.

Common Architectural Patterns

Pattern	Description	Best For
Layered	Organizes into horizontal layers (presentation, logic, data)	Enterprise applications
Client-Server	Client requests services from a server	Web applications, networked systems
Microservices	Small, independent services communicating via APIs	Large-scale distributed systems
Event-Driven	Components respond to events	Real-time, IoT systems

Three-Tier Architecture

    +-------------------+
    |   Presentation    |   (User Interface)
    |      Tier         |   - Web browser, mobile app
    +--------+----------+
             |
             v
    +--------+----------+
    |   Application     |   (Business Logic)
    |      Tier         |   - Server-side code, APIs
    +--------+----------+
             |
             v
    +--------+----------+
    |   Data            |   (Database)
    |      Tier         |   - SQL/NoSQL database
    +-------------------+

Benefits:
- Separation of concerns
- Independent scaling of each tier
- Easier maintenance and testing

Architecture Design Process

Identify architectural requirements (performance, security, scalability)
Evaluate candidate architectural patterns
Define the system's component structure
Specify interfaces between components
Document quality attributes and constraints
Create architecture diagrams
Validate against requirements with stakeholders

Quality Attributes

Performance: Response time, throughput
Scalability: Ability to handle increased load
Reliability: Uptime, fault tolerance
Security: Authentication, authorization, encryption
maintainability: Ease of modification and extension
Portability: Ability to run on different platforms

Summary

System architecture is the blueprint of the entire system. A well-chosen architecture ensures that the system meets quality attributes, supports business goals, and can evolve as requirements change.

🧪 Quick Quiz

In a three-tier architecture, the three layers are:

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