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Architecture Patterns

Architecture patterns are pre-defined solutions to recurring design problems that provide proven solutions for building software systems. Here's an overview of some popular architecture patterns and code examples for each:

  • Layered Architecture: A layered architecture separates concerns into distinct layers, with each layer handling a specific set of responsibilities. This approach provides a clear separation of concerns and improves maintainability.

Example code for a three-layered architecture:

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// Presentation layer
function showHomepage() {
  const data = getDataFromDatabase();
  renderHomepage(data);
}

// Business logic layer
function getDataFromDatabase() {
  const data = fetch('/api/data');
  return data;
}

// Data access layer
function fetch(url) {
  return fetch(url).then(response => response.json());
}
  • Microservices: A microservices architecture divides a system into small, independent services that communicate through APIs. This approach allows for greater flexibility, scalability, and fault tolerance.

Example code for a simple microservice:

javascript
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// Microservice
const express = require('express');
const app = express();

app.get('/api/data', (req, res) => {
  res.json({ data: 'Some data' });
});

app.listen(3000, () => {
  console.log('Microservice is running');
});
  • Event-driven Architecture: An event-driven architecture uses events to trigger and communicate changes between components. This approach provides loose coupling and scalability, making it ideal for systems with unpredictable workloads.

Example code for an event-driven architecture:

javascript
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// Initialize event bus
const EventEmitter = require('events');
const eventBus = new EventEmitter();

// Event handler
eventBus.on('newData', (data) => {
  console.log(`New data received: ${data}`);
});

// Event trigger
fetch('/api/data').then(data => {
  eventBus.emit('newData', data);
});

In conclusion, architecture patterns are powerful tools for creating software solutions that are scalable, maintainable, and reliable. By understanding and using popular architecture patterns like layered architecture, microservices, and event-driven architecture, you can build systems that meet the needs of your business and users.



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