0% completed
Let's take a look at a simple Java example implementing the BFF pattern.
Coding Example
Let’s say we have an e-commerce application with a web frontend and a mobile app.
1. Product Service (Main Backend Service):
- Provides product information.
2. Web BFF:
- Tailored for web browsers.
- Provides extensive product details.
3. Mobile BFF:
- Tailored for mobile apps.
- Provides concise product information to save data and improve load times.
1. Product Service (Main Backend)
This is the main backend microservice that deals with products.
@RestController @RequestMapping("/products") public class ProductServiceController { @Autowired private ProductRepository productRepository; @GetMapping("/{productId}") public Product getProductById(@PathVariable String productId) { return productRepository.findById(productId) .orElseThrow(() -> new ProductNotFoundException(productId)); } }
In this simple controller, we have a method getProductById
that fetches a product based on its ID. It interacts with a ProductRepository
to fetch product data from the database. The Product
class would contain all the detailed information about a product.
2. Web BFF
The Web BFF is tailored for the web frontend.
@RestController @RequestMapping("/web/products") public class WebProductController { @Autowired private ProductServiceClient productServiceClient; @GetMapping("/{productId}") public ProductDetails getProductDetails(@PathVariable String productId) { Product product = productServiceClient.getProductById(productId); return convertToWebProductDetails(product); } private ProductDetails convertToWebProductDetails(Product product) { // Logic to convert product to a detailed view suitable for web. // This could include adding more descriptions, images, etc. } }
Here, ProductServiceClient
is a Feign client or any HTTP client that you are using to communicate with the Product Service. The getProductDetails
method fetches a product and then converts it to a ProductDetails
object, which is a detailed view tailored for web users.
3. Mobile BFF
The Mobile BFF is tailored for the mobile frontend.
@RestController @RequestMapping("/mobile/products") public class MobileProductController { @Autowired private ProductServiceClient productServiceClient; @GetMapping("/{productId}") public SimpleProductDetails getProductDetails(@PathVariable String productId) { Product product = productServiceClient.getProductById(productId); return convertToMobileProductDetails(product); } private SimpleProductDetails convertToMobileProductDetails(Product product) { // Logic to convert product to a concise view suitable for mobile. // This could include stripping down descriptions, using smaller images, etc. } }
In the Mobile BFF, the getProductDetails
method fetches the product just like in the Web BFF, but it converts the product to a SimpleProductDetails
object, which is a more concise view tailored for mobile users.
In Action
So in this setup:
- The main Product Service handles all the heavy lifting related to product data.
- The Web BFF provides a detailed view of the product, suitable for web users.
- The Mobile BFF provides a concise view of the product, suitable for mobile users.
Each frontend gets exactly what it needs, and the backend logic is tailored to provide the best possible user experience.
.....
.....
.....
Table of Contents
Contents are not accessible
Contents are not accessible
Contents are not accessible
Contents are not accessible
Contents are not accessible