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🌟 System Design Patterns

                 🏗️ SYSTEM DESIGN PATTERNS
                         │
 ┌───────────────┬───────────────┬──────────────┬────────────────┐
 │               │               │              │
🏢 Architecture 💬 Communication 🚀 Scalability ❤️ Availability

🎯 Imagine You Are Building a Giant LEGO City

Every building is a service. Roads help them talk. Traffic lights keep everything safe. More buildings can be added when lots of people visit.

That is exactly what System Design is.

🏢 1. Architectural Patterns

Architecture
│
├── 🧩 Layered
├── 🚀 Microservices
└── ⚡ Event Driven

🏢 Layered Architecture

👦 User
   │
🎨 UI
   │
🧠 Business Logic
   │
💾 Database

🍕 Example

Ordering pizza:

  • You talk to cashier.
  • Cashier tells chef.
  • Chef cooks.
  • Store keeps record.

Each layer has one job.

🚀 Microservices

📦 Shop
├── 👤 User Service
├── 💳 Payment Service
├── 📦 Order Service
└── 🚚 Delivery Service

Imagine superheroes. Each hero has only ONE power.

⚡ Event Driven

🎂 Birthday
      │
      ▼
📧 Email
🎁 Gift
🎵 Music
📱 Notification

One event starts many actions.

💬 2. Communication Patterns

Service A
   │
   ├── 📞 Request / Response
   ├── ⚡ gRPC
   └── 📢 Pub/Sub

📞 Request-Response

Like asking:

👦 "Can I have water?"

👩 "Yes."

📢 Pub/Sub

📢 School Bell
     │
──────────────
👦 Class A
👧 Class B
👨 Teachers

Everyone hears the bell.

⚡ gRPC

Like two robots speaking a super-fast robot language.

🤖➡️🤖

🚀 3. Scalability Patterns

🚀 Scalability
│
├── ⚖️ Load Balancer
├── ⚡ Cache
└── 🧩 Sharding

⚖️ Load Balancer

       😀😀😀😀😀
          │
    ⚖️ Load Balancer
     ┌──┴───┐
   🖥️      🖥️

Like one teacher sending students to different classrooms.

⚡ Cache

📚 Library
   │
Frequently Read Books
       ↓
📖 Small Shelf

Keep popular things nearby.

🧩 Sharding

Instead of one giant cupboard:

Cupboard A
Cupboard B
Cupboard C

Split data into smaller cupboards.

❤️ 4. Availability Patterns

❤️ Availability
│
├── 🛡 Circuit Breaker
├── 🚢 Bulkhead
└── 🔁 Redundancy

🛡 Circuit Breaker

Service ❌
    │
Breaker Opens
    │
No More Requests

Like a home fuse.

🚢 Bulkhead

A ship has many rooms.

If one room fills with water, the whole ship does not sink.

🔁 Redundancy

💾 Server 1
💾 Server 2
💾 Server 3

If one sleeps, another works.

🎮 Mini Quiz

  1. Which pattern sends messages to many listeners?
  • ☐ Cache
  • ☑ Pub/Sub
  1. Which pattern stores popular data?
  • ☑ Cache
  1. Which pattern divides traffic?
  • ☑ Load Balancer
  1. Which pattern protects from failing services?
  • ☑ Circuit Breaker

🎨 Memory Map

🏗️ System Design

🏢 Build → Architecture
💬 Talk → Communication
🚀 Grow → Scalability
❤️ Never Stop → Availability

⭐ Golden Rule

Build it so it is easy to understand, easy to grow, fast, and always available.