如何在Castle Windsor中使用嵌套的接口实现？

Question

假设我有一个用于获取数据的接口,以及它的实现:

interface IResourceProvider
{
  string Get( Uri uri );
}

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

我可以在Castle Windsor注册,如下:

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

(这都很好).

如果我然后决定我想要一个缓存实现如下:

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;
}

我如何注册这些嵌套的依赖项？即,我想说一个IResourceProvider是由a实现的CachingResourceProvider,除了在构造函数中的位置,它是a HttpResourceProvider.

Answer 1

只需注册CachingResourceProvider之前HttpResourceProvider-如

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

BTW - 这被称为装饰器设计模式.