Reuse Patterns & Frameworks
Software reuse patterns and frameworks provide structured approaches to building software by leveraging pre-built components and design solutions.
Frameworks vs Libraries
+---------------------------------------------------------+
| FRAMEWORK vs LIBRARY |
+---------------------------------------------------------+
| |
| LIBRARY |
| - You call the library's code |
| - You are in control |
| - Example: Using Math.sqrt() in Java |
| |
| FRAMEWORK |
| - The framework calls your code (Inversion of Control)|
| - The framework is in control |
| - Example: Spring Boot, Django, React |
| |
+---------------------------------------------------------+
Popular Frameworks by Domain
+------------------+------------------------------------------+
| Domain | Frameworks |
+------------------+------------------------------------------+
| Web Backend | Spring Boot, Django, Express, Rails |
| Web Frontend | React, Angular, Vue.js |
| Mobile | React Native, Flutter, SwiftUI |
| Testing | JUnit, pytest, Jest, Selenium |
| Build | Maven, Gradle, Webpack |
| Data Science | TensorFlow, PyTorch, scikit-learn |
| Enterprise | Jakarta EE, .NET, Laravel |
+------------------+------------------------------------------+
Design Patterns as Reuse
// Singleton Pattern - Reusable structural solution
public class DatabaseConnection {
private static DatabaseConnection instance;
private DatabaseConnection() {}
public static synchronized DatabaseConnection getInstance() {
if (instance == null) {
instance = new DatabaseConnection();
}
return instance;
}
}
// Factory Pattern - Reusable creation logic
public class NotificationFactory {
public static Notification create(String type) {
switch (type) {
case "email": return new EmailNotification();
case "sms": return new SmsNotification();
default: throw new IllegalArgumentException(type);
}
}
}
Key Takeaways
- Frameworks provide structure and reduce boilerplate code
- Design patterns are reusable solutions to common problems
- Understanding the IoC principle is key to framework usage
- Choose frameworks based on community support and documentation