一个项目中工厂应该住在哪里？

Question

我有一个名为 MudEngine.Core 的项目的解决方案。这个项目包含一些基本的类然后是我的域对象在后面抽象的所有接口。 IWorld 和 IRealm.

等接口

域接口示例

public interface IWorld : IGameComponent, ICloneableComponent<IWorld>
{
    /// <summary>
    /// Gets how many hours it takes to complete one full day in this world.
    /// </summary>
    int HoursPerDay { get; }

    /// <summary>
    /// Gets or sets the game day to real hour ratio.
    /// </summary>
    double GameDayToRealHourRatio { get; set; }

    /// <summary>
    /// Adds a collection of realms to world, initializing them as they are added.
    /// </summary>
    /// <param name="realms">The realms.</param>
    /// <returns>
    /// Returns an awaitable Task
    /// </returns>
    IRealm[] GetRealmsInWorld();

    /// <summary>
    /// Initializes and then adds the given realm to this world instance.
    /// </summary>
    /// <param name="realm">The realm to add.</param>
    /// <returns>Returns an awaitable Task</returns>
    Task AddRealmToWorld(IRealm realm);

    /// <summary>
    /// Creates and initializes a new instance of a realm.
    /// </summary>
    /// <param name="name">The name of the realm.</param>
    /// <param name="owner">The world that owns this realm.</param>
    /// <returns>Returns an initialized instance of IRealm</returns>
    Task<IRealm> CreateRealm(string name, IWorld owner);

    /// <summary>
    /// Adds a collection of realms to world, initializing them as they are added.
    /// </summary>
    /// <param name="realms">The realms.</param>
    /// <returns>Returns an awaitable Task</returns>
    Task AddRealmsToWorld(IEnumerable<IRealm> realms);

    /// <summary>
    /// Removes the given realm from this world instance, deleting the realm in the process.
    /// If it must be reused, you may clone the realm and add the clone to another world.
    /// </summary>
    /// <param name="realm">The realm to remove.</param>
    /// <returns>Returns an awaitable Task</returns>
    Task RemoveRealmFromWorld(IRealm realm);

    /// <summary>
    /// Removes a collection of realms from this world instance.
    /// If any of the realms don't exist in the world, they will be ignored.
    /// The realms will be deleted during the process.
    /// If they must be reused, you may clone the realm and add the clone to another world.
    /// </summary>
    /// <param name="realms">The realms collection.</param>
    /// <returns>Returns an awaitable Task</returns>
    Task RemoveRealmsFromWorld(IEnumerable<IRealm> realms);
}

我还有一个名为 MudEngine.Mud 的项目，它是所有接口的默认实现。

MudEngine.Core 项目包括我工厂的接口。 IWorldFactory 和 IRealmFactory 等工厂。 IWorld 界面有一个创建方法，它使用给定的 IRealmFactory 来创建领域和 return 它们。

示例工厂接口

/// <summary>
/// Provides methods for creating an instance of an IRealm implementation
/// </summary>
public interface IRealmFactory
{
    /// <summary>
    /// Creates and initializes a new instance of a realm.
    /// </summary>
    /// <param name="name">The name of the realm.</param>
    /// <param name="owner">The world that owns this realm.</param>
    /// <returns>Returns an initialized instance of IRealm</returns>
    Task<IRealm> CreateRealm(string name, IWorld owner);

    /// <summary>
    /// Creates and initializes a new instance of a realm.
    /// </summary>
    /// <param name="name">The name of the realm.</param>
    /// <param name="owner">The world that owns this realm.</param>
    /// <param name="timeZoneOffset">The time zone offset to apply to the realm.</param>
    /// <returns>Returns an initialized instance of IRealm</returns>
    Task<IRealm> CreateRealm(string name, IWorld owner, ITimeOfDay timeZoneOffset);

    /// <summary>
    /// Creates and initializes a new instance of a realm.
    /// All of the children zones will be initialized prior to being added to the realm.
    /// </summary>
    /// <param name="name">The name of the realm.</param>
    /// <param name="owner">The world that owns this realm.</param>
    /// <param name="zones">A collection of zones that will be initialized and added to the realm.</param>
    /// <returns>Returns an initialized instance of IRealm</returns>
    Task<IRealm> CreateRealm(string name, IWorld owner, IEnumerable<IZone> zones);

    /// <summary>
    /// Creates and initializes a new instance of a realm.
    /// All of the children zones will be initialized prior to being added to the realm.
    /// </summary>
    /// <param name="name">The name of the realm.</param>
    /// <param name="owner">The world that owns this realm.</param>
    /// <param name="timeZoneOffset">The time zone offset to apply to the realm.</param>
    /// <param name="zones">A collection of zones that will be initialized and added to the realm.</param>
    /// <returns>Returns an initialized instance of IRealm</returns>
    Task<IRealm> CreateRealm(string name, IWorld owner, ITimeOfDay timeZoneOffset, IEnumerable<IZone> zones);
}

当我在 IWorld 接口上调用 CreateRealm 时，实现使用 IRealmFactory 来创建它。工厂通过 IWorld 实现的构造函数传入。

我现在的问题是，工厂实现应该存在于何处？包含域接口实现的同一个项目为工厂提供实现是否很常见，还是应该由消费层（例如 presentation/unit 测试项目）负责实现工厂并使用它们？

目的是可以根据您正在构建的基于文本的游戏类型来替换这些组件。所以我倾向于每个实现接口的包都有自己的工厂。不过，我关心的是 DI 设置。 IoC 容器进一步位于分层（server/client 应用程序）需要知道它应该使用每个包中的哪个工厂，而不是仅仅使用 IoC 容器所属的消费层中定义的工厂.

有这方面的行业标准指南吗？

Answer 1

您似乎正在尝试构建具有抽象子域的域模型（我想您可以称它们为子域，因为它们是成熟的游戏系统），即用户可以在运行时动态选择一个子域，从而触发一些子域-不可知论行为，然后在一段时间内用它做特定于子域的事情，并可能在完成后跳转到另一个。

尽管根据我的经验，您很少会在 "normal" 业务线项目中遇到这种情况，但我会这样做：

为通用的世界和领域管理创建一个包罗万象的限界上下文。将 IWorld 和 IRealmFactory 放在那里。
为每个游戏系统子域创建一个单独的限界上下文。它们可以是整个项目或只是命名空间。在这些写IRealmFactory的实现。
这是我认为使用 Container.Resolve(...) 可以合法的少数实例之一。在IoC配置中创建命名注册并随时解析其中之一，以连接一个游戏系统对应的对象子图。

一个项目中工厂应该住在哪里？

Where should factories live in a project?

c#

domain-driven-design

factory-pattern

域接口示例

示例工厂接口