Backend API Development

using Microsoft.AspNetCore.Mvc;
using System.Threading.Tasks;

[ApiController]
[Route("api/[controller]")]
public class ProductController : ControllerBase
{
    private readonly IProductService _productService;

    public ProductController(IProductService productService)
    {
        _productService = productService;
    }

    [HttpGet]
    public async Task<IActionResult> GetProducts()
    {
        var products = await _productService.GetAllAsync();
        return Ok(products);
    }

    [HttpGet("{id}")]
    public async Task<IActionResult> GetProduct(int id)
    {
        var product = await _productService.GetByIdAsync(id);
        
        if (product == null)
            return NotFound();
            
        return Ok(product);
    }
}

package com.nimblesoftwarelab.api.controller;

import com.nimblesoftwarelab.api.model.Product;
import com.nimblesoftwarelab.api.service.ProductService;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;

@RestController
@RequestMapping("/api/products")
public class ProductController {

    private final ProductService productService;

    public ProductController(ProductService productService) {
        this.productService = productService;
    }

    @GetMapping
    public ResponseEntity<List<Product>> getAllProducts() {
        return ResponseEntity.ok(productService.findAll());
    }

    @GetMapping("/{id}")
    public ResponseEntity<Product> getProductById(@PathVariable Long id) {
        return productService.findById(id)
            .map(ResponseEntity::ok)
            .orElse(ResponseEntity.notFound().build());
    }
}