动态代理拦截器中的通用参数

时间:2015-07-14 14:08:18

标签: c# castle-dynamicproxy ninject-interception

要从内存缓存中添加和检索对象,我有一个带有这些方法的缓存util类:

public static T GetNativeItem<T>(string itemKey)
public static void AddNativeItem(string key, object item, TimeSpan timeout)

从数据访问类中删除一些噪音我想使用Castle Dynamic Proxy,在这种特殊情况下我会使用Ninject.Extensions.Interception

问题是缓存util的GetNativeItem<T>(string itemKey),在我的拦截器中如何从T检索invocation

NinjectWebCommon绑定:

kernel.Bind<IMatchDataAccess>().To<MatchDataAccess>().Intercept().With<CacheInterceptor>();

IMatchDataAccess接口具有以下签名:

public interface IMatchDataAccess
{
    [Cached(minutes: 10)]
    IEnumerable<DomainModel.Match> GetMatches(MatchFilterDto matchFilter);
}

并且CacheInterceptor具有此实现:

public class CacheInterceptor : IInterceptor
  {
    public void Intercept(IInvocation invocation)
    {
      var cachedAttr = invocation.Request.Method.GetAttribute<CachedAttribute>();

      var p = invocation;
      if (cachedAttr == null)
      {
        invocation.Proceed();
        return;
      }

      var cacheKey = String.Concat(invocation.Request.Method.ReturnType.ToString(), ".", invocation.Request.Method.Name, "(", String.Join(", ", invocation.Request.Arguments), ")");

      /*
          problem is here
      */ 
      var p = invocation.Request.Method.ReturnType;
      var objInCache = CacheUtil.GetNativeItem<p>(cacheKey);


      if (objInCache != null)
        invocation.ReturnValue = objInCache;

      else
      {
        invocation.Proceed();
        var timeout = cachedAttr.Minutes > 0 ? new TimeSpan(0, cachedAttr.Minutes, 0) : new TimeSpan(0, 60, 0);
        CacheUtil.AddNativeItem(cacheKey, invocation.ReturnValue, timeout);
      }
    }
  }

0 个答案:

没有答案