如何在温莎城堡中使用接口的嵌套实现？

发布于 2024-12-03 07:07:14 字数 999 浏览 2 评论 0原文

假设我有一个用于获取数据的接口及其实现：

interface IResourceProvider
{
  string Get( Uri uri );
}

class HttpResourceProvider : IResourceProvider
{
  public string Get( Uri uri )
  {
    // Download via HTTP.
  }
}

我可以在温莎城堡中注册它，如下所示：（

container.Register
  ( Component.For<IResourceProvider>().ImplementedBy<HttpResourceProvider>()
  );

这一切都很好）。

如果我随后决定想要一个缓存实现，如下所示：

class CachingResourceProvider : IResourceProvider
{
  public CachingResourceProvider( IResourceProvider resourceProvider )
  {
    _resourceProvider = resourceProvider;
  }

  public string Get( Uri uri )
  {
    // Return from cache if it exists.
    // Otherwise use _resourceProvider and add to cache.
  }

  private readonly IResourceProvider _resourceProvider;
}

如何注册这些嵌套依赖项？，即，我想说 IResourceProvider 是由 CachingResourceProvider 实现的，除了构造函数中的 HttpResourceProvider。

原文

Suppose I have an interface for fetching data, and an implementation of it:

interface IResourceProvider
{
  string Get( Uri uri );
}

class HttpResourceProvider : IResourceProvider
{
  public string Get( Uri uri )
  {
    // Download via HTTP.
  }
}

I can register this in Castle Windsor as follows:

container.Register
  ( Component.For<IResourceProvider>().ImplementedBy<HttpResourceProvider>()
  );

(Which is all fine).

If I then decided I wanted a caching implementation as follows:

class CachingResourceProvider : IResourceProvider
{
  public CachingResourceProvider( IResourceProvider resourceProvider )
  {
    _resourceProvider = resourceProvider;
  }

  public string Get( Uri uri )
  {
    // Return from cache if it exists.
    // Otherwise use _resourceProvider and add to cache.
  }

  private readonly IResourceProvider _resourceProvider;
}

How would I register these nested dependencies? i.e., I want to say an IResourceProvider is implemented by a CachingResourceProvider, except where in the constructor, where it's a HttpResourceProvider.

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猫弦 2024-12-10 07:07:14

只需在 HttpResourceProvider 之前注册 CachingResourceProvider - 例如

container.Register(Component
    .For<IResourceProvider>()
    .ImplementedBy<CachingResourceProvider>());
container.Register(Component
    .For<IResourceProvider>()
    .ImplementedBy<HttpResourceProvider>());

顺便说一句 - 这被称为装饰器设计模式。

Just register CachingResourceProvider before HttpResourceProvider - e.g.

container.Register(Component
    .For<IResourceProvider>()
    .ImplementedBy<CachingResourceProvider>());
container.Register(Component
    .For<IResourceProvider>()
    .ImplementedBy<HttpResourceProvider>());

BTW - this is know as the Decorator design pattern.

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