/// <summary>
/// Called during the chain of responsibility for a build operation. The
/// PreBuildUp method is called when the chain is being executed in the
/// forward direction.
/// </summary>
/// <remarks>In this class, PreBuildUp is responsible for figuring out if the
/// class is proxiable, and if so, replacing it with a proxy class.</remarks>
/// <param name="context">Context of the build operation.</param>
public override void PreBuildUp(IBuilderContext context)
{
Guard.ArgumentNotNull(context, "context");
if (context.Existing != null)
{
return;
}
Type typeToBuild;
if (!BuildKey.TryGetType(context.BuildKey, out typeToBuild))
{
return;
}
ITypeInterceptionPolicy interceptionPolicy = GetInterceptionPolicy(context);
if (interceptionPolicy == null)
{
return;
}
if (!interceptionPolicy.Interceptor.CanIntercept(typeToBuild))
{
return;
}
lock (lockObj)
{
if (interceptionPolicy.ProxyType == null)
{
Type typeToIntercept = typeToBuild;
if (typeToIntercept.IsGenericType)
{
typeToIntercept = typeToIntercept.GetGenericTypeDefinition();
}
interceptionPolicy.ProxyType = interceptionPolicy.Interceptor.CreateProxyType(typeToIntercept);
}
}
Type interceptingType = interceptionPolicy.ProxyType;
if (interceptingType.IsGenericTypeDefinition)
{
interceptingType = interceptingType.MakeGenericType(typeToBuild.GetGenericArguments());
}
SelectedConstructor currentConstructor = GetCurrentConstructor(context);
SelectedConstructor newConstructor = FindNewConstructor(currentConstructor, interceptingType);
IConstructorSelectorPolicy newSelector = new ConstructorWithResolverKeysSelectorPolicy(newConstructor);
context.Policies.Set(newSelector, context.BuildKey);
}
/// <summary>
/// Called during the chain of responsibility for a build operation. The
/// PostBuildUp method is called when the chain has finished the PreBuildUp
/// phase and executes in reverse order from the PreBuildUp calls.
/// </summary>
/// <remarks>In this class, PostBuildUp checks to see if the object was proxyable,
/// and if it was, wires up the handlers.</remarks>
/// <param name="context">Context of the build operation.</param>
public override void PostBuildUp(IBuilderContext context)
{
Guard.ArgumentNotNull(context, "context");
IInterceptingProxy proxy = context.Existing as IInterceptingProxy;
if (proxy == null)
{
return;
}
ITypeInterceptionPolicy interceptionPolicy = GetInterceptionPolicy(context);
Type typeToIntercept = BuildKey.GetType(context.BuildKey);
PolicySet interceptionPolicies = new PolicySet(BuilderContext.NewBuildUp <InjectionPolicy[]>(context));
IUnityContainer currentContainer = BuilderContext.NewBuildUp <IUnityContainer>(context);
foreach (MethodImplementationInfo item in interceptionPolicy.Interceptor.GetInterceptableMethods(typeToIntercept, typeToIntercept))
{
HandlerPipeline pipeline = new HandlerPipeline(
interceptionPolicies.GetHandlersFor(item, currentContainer));
proxy.SetPipeline(interceptionPolicy.Interceptor.MethodInfoForPipeline(item), pipeline);
}
}