CachingImplementationResolver.cs :  » Build-Systems » CruiseControl.NET » Objection » C# / CSharp Open Source

using System;

namespace Objection{
  public class CachingImplementationResolver : ImplementationResolver
  {
    private readonly ImplementationResolver decoratoredResolver;
    private readonly TypeToTypeMap resolvedTypeCache;

    public CachingImplementationResolver(ImplementationResolver decoratoredResolver, TypeToTypeMap resolvedTypeCache)
    {
      this.decoratoredResolver = decoratoredResolver;
      this.resolvedTypeCache = resolvedTypeCache;
    }

    public Type ResolveImplementation(Type baseType)
    {
      Type resolvedType = resolvedTypeCache[baseType];
      if (resolvedType == null)
      {
        resolvedType = AllowOneThreadPerAppDomainToDoResolution(baseType);
      }
      return resolvedType;
    }

    private Type AllowOneThreadPerAppDomainToDoResolution(Type baseType)
    {
      Type resolvedType;
      lock (baseType)
      {
        resolvedType = resolvedTypeCache[baseType];
        if (resolvedType == null)
        {
          resolvedType = decoratoredResolver.ResolveImplementation(baseType);
          resolvedTypeCache[baseType] = resolvedType;
        }
      }
      return resolvedType;
    }
  }
}