Clean Code

範例：世紀帝國（抽象工廠模式)

Pattern: 抽象工廠模式

Class Diagram: 世紀帝國

情境：根據用戶端對兵種的需求，我們要生產對應的軍事單位

這邊我們省略軍事單位的定義。
可參考範例：世紀帝國（簡單工廠模式)。

  • 定義裝備工廠
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using DotNetCoreKata.DomainModels.AgeOfEmpires.Transportation;
using DotNetCoreKata.DomainModels.AgeOfEmpires.Weapon;

namespace DotNetCoreKata.DomainModels;

public interface IEquipmentFactory
{
    IWeapon CreateWeapon();
    ITransportation CreateTransportation();
}
  • 定義民兵裝備工廠
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using DotNetCoreKata.DomainModels.AgeOfEmpires.Transportation;
using DotNetCoreKata.DomainModels.AgeOfEmpires.Weapon;

namespace DotNetCoreKata.DomainModels.AgeOfEmpires;

public class MilitiaEquipmentFactory : IEquipmentFactory
{
    public ITransportation CreateTransportation()
    {
        return new Legs();
    }

    public IWeapon CreateWeapon()
    {
        return new Stick();
    }
}
  • 定義弓兵裝備工廠
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using DotNetCoreKata.DomainModels.AgeOfEmpires.Transportation;
using DotNetCoreKata.DomainModels.AgeOfEmpires.Weapon;

namespace DotNetCoreKata.DomainModels.AgeOfEmpires;

public class ArcherEquipmentFactory: IEquipmentFactory
{
    public IWeapon CreateWeapon()
    {
        return new Bow();
    }
    public ITransportation CreateTransportation()
    {
        return new Legs();
    }
}
  • 定義騎士裝備工廠
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using DotNetCoreKata.DomainModels.AgeOfEmpires.Transportation;
using DotNetCoreKata.DomainModels.AgeOfEmpires.Weapon;

namespace DotNetCoreKata.DomainModels.AgeOfEmpires;

public class KnightEquipmentFactory : IEquipmentFactory
{
    public ITransportation CreateTransportation()
    {
        return new Horse();
    }

    public IWeapon CreateWeapon()
    {
        return new Sword();
    }
}
  • 客戶端
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using DotNetCoreKata.DomainModels;
using DotNetCoreKata.DomainModels.AgeOfEmpires;
using DotNetCoreKata.Enums;

namespace DotNetCoreKata.Services.AgeOfEmpires;

public class Client : IClient
{
    public IUnit Train(UnitCategory unitCategory)
    {
        Console.Write($"Ask resources to build unit: {unitCategory}.");

        IEquipmentFactory equipmentFactory = unitCategory switch
        {
            UnitCategory.Military => new MilitiaEquipmentFactory(),
            UnitCategory.Archer => new ArcherEquipmentFactory(),
            UnitCategory.Knight => new KnightEquipmentFactory(),
            _ => new MilitiaEquipmentFactory()
        };

        return new Unit(equipmentFactory.CreateWeapon(), equipmentFactory.CreateTransportation());
    }
}

ʕ •ᴥ•ʔ：重讀一次 Design Pattern，改用 C# 來寫範例。

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