تنظيم الكود في الخدمات المصغرة ونهجي في استخدام العمارة السداسية و DDD

المصطلح

1) الابتدائية

2) المعالجات الثانوية

3) المنطق

3.1) الكيانات

3.2) خدمات المجال

نطاق

نص مقيد

التبعيات بين الطبقات

خيار للخدمات الصغيرة البسيطة التي قانون باريتو 80 في المئة

مثال

    public class Discount
    {
        [Key]
        public Guid Id { get; set; }

        public decimal Value { get; set; }
    }

    [Owned]
    public class Money
    {
        public decimal Amount { get; set; }

        public Money Apply(Discount discount)
        {
            var amount = Amount * (1 - discount.Value);
            return new Money()
            {
                Amount = amount
            };
        }
    }

    public class Item
    {
        [Key]
        public Guid Id { get; set; }

        public Money Price { get; set; } = new Money();
    }

    public interface IPriceCalculator
    {
        Money WithDiscounts(Item item, IEnumerable<Discount> discounts);
    }

     public sealed class PriceCalculator:IPriceCalculator
    {
        public Money WithDiscounts(Item item, IEnumerable<Discount> discounts)
        {
            return discounts.Aggregate(item.Price, (m, d) => m.Apply(d));
        }
    }

    public class ItemsDbContext : DbContext
    {
        public ItemsDbContext(DbContextOptions<ItemsDbContext> options) : base(options)
        {

        }

        public DbSet<Item> Items { get; set; }

        public DbSet<Discount> Discounts { get; set; }
    }

    [ApiController]
    [Route("api/v1/items")]
    public class ItemsController : ControllerBase
    {
        private readonly ItemsDbContext _context;
        private readonly IPriceCalculator _priceCalculator;

        public ItemsController(ItemsDbContext context, IPriceCalculator priceCalculator)
        {
            _context = context;
            _priceCalculator = priceCalculator;
        }

        [HttpGet("{id}/price-with-discounts")]
        public async Task<decimal> GetPriceWithDiscount(Guid id)
        {
            var item = await _context.Items.FindAsync(id);
            var discounts = await _context.Discounts.ToListAsync();
            return _priceCalculator.WithDiscounts(item, discounts).Amount;
        }
    }

خيار الخدمات الصغيرة المعقدة التي 20 في المائة ومعظم الأحاديات

مثال

    public interface IItemsRepository
    {
        Task<Item> Get(Guid id);
    }

    public sealed class ItemsRepository : IItemsRepository
    {
        private readonly ItemsDbContext _context;

        public ItemsRepository(ItemsDbContext context)
        {
            _context = context;
        }

        public async Task<Item> Get(Guid id)
        {
            var item = await _context.Items.FindAsync(id);
            return item;
        }
    }

    public interface IDiscountsRepository
    {
        Task<List<Discount>> Get();
    }

    public sealed class DiscountsRepository : IDiscountsRepository
    {
        private readonly ItemsDbContext _context;

        public DiscountsRepository(ItemsDbContext context)
        {
            _context = context;
        }

        public Task<List<Discount>> Get()
        {
            return _context.Discounts.ToListAsync();
        }
    }

    public interface IItemService
    {
        Task<decimal> GetPriceWithDiscount(Guid id);
    }

    public class ItemService : IItemService
    {
        private readonly IItemsRepository _items;
        private readonly IDiscountsRepository _discounts;
        private readonly IPriceCalculator _priceCalculator;

        public ItemService(IItemsRepository items, IDiscountsRepository discounts, IPriceCalculator priceCalculator)
        {
            _items = items;
            _discounts = discounts;
            _priceCalculator = priceCalculator;
        }

        public async Task<decimal> GetPriceWithDiscount(Guid id)
        {
            var item = await _items.Get(id);
            var discounts = await _discounts.Get();
            return _priceCalculator.WithDiscounts(item, discounts).Amount;
        }
    }

    [ApiController]
    [Route("api/v1/items")]
    public class ItemsController : ControllerBase
    {
        private readonly IItemService _service;

        public ItemsController(IItemService service)
        {
            _service = service;
        }

        [HttpGet("{id}/price-with-discounts")]
        public async Task<decimal> GetPriceWithDiscount(Guid id)
        {
            var result = await _service.GetPriceWithDiscount(id);
            return result;
        }
    }

مثال على التنفيذ

شكر وتقدير