/// <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 proxyable, 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 = context.BuildKey.Type;
var interceptionPolicy = FindInterceptionPolicy <ITypeInterceptionPolicy>(context);
if (interceptionPolicy == null)
{
return;
}
var interceptor = interceptionPolicy.GetInterceptor(context);
if (!interceptor.CanIntercept(typeToBuild))
{
return;
}
var interceptionBehaviorsPolicy = FindInterceptionPolicy <IInterceptionBehaviorsPolicy>(context);
IEnumerable <IInterceptionBehavior> interceptionBehaviors =
interceptionBehaviorsPolicy == null
?
Enumerable.Empty <IInterceptionBehavior>()
:
interceptionBehaviorsPolicy.GetEffectiveBehaviors(
context, interceptor, typeToBuild, typeToBuild)
.Where(ib => ib.WillExecute);
IAdditionalInterfacesPolicy additionalInterfacesPolicy =
FindInterceptionPolicy <IAdditionalInterfacesPolicy>(context);
IEnumerable <Type> additionalInterfaces =
additionalInterfacesPolicy != null ? additionalInterfacesPolicy.AdditionalInterfaces : Type.EmptyTypes;
context.Policies.Set <EffectiveInterceptionBehaviorsPolicy>(
new EffectiveInterceptionBehaviorsPolicy {
Behaviors = interceptionBehaviors
},
context.BuildKey);
Type[] allAdditionalInterfaces =
Intercept.GetAllAdditionalInterfaces(interceptionBehaviors, additionalInterfaces);
Type interceptingType =
interceptor.CreateProxyType(typeToBuild, allAdditionalInterfaces);
DerivedTypeConstructorSelectorPolicy.SetPolicyForInterceptingType(context, interceptingType);
}
/// <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 proxyable, 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)
{
if (context.Existing != null)
{
return;
}
Type typeToBuild = context.BuildKey.Type;
var interceptionPolicy = FindInterceptionPolicy <ITypeInterceptionPolicy>(context);
if (interceptionPolicy == null)
{
return;
}
var interceptor = interceptionPolicy.GetInterceptor(context);
if (!interceptor.CanIntercept(typeToBuild))
{
return;
}
var interceptionBehaviorsPolicy = FindInterceptionPolicy <IInterceptionBehaviorsPolicy>(context);
IEnumerable <IInterceptionBehavior> interceptionBehaviors =
interceptionBehaviorsPolicy == null
?
Enumerable.Empty <IInterceptionBehavior>()
:
interceptionBehaviorsPolicy.GetEffectiveBehaviors(
context, interceptor, typeToBuild, typeToBuild)
.Where(ib => ib.WillExecute);
IAdditionalInterfacesPolicy additionalInterfacesPolicy =
FindInterceptionPolicy <IAdditionalInterfacesPolicy>(context);
IEnumerable <Type> additionalInterfaces =
additionalInterfacesPolicy != null ? additionalInterfacesPolicy.AdditionalInterfaces : Type.EmptyTypes;
var enumerable = interceptionBehaviors as IInterceptionBehavior[] ?? interceptionBehaviors.ToArray();
context.Registration.Set(typeof(EffectiveInterceptionBehaviorsPolicy),
new EffectiveInterceptionBehaviorsPolicy {
Behaviors = enumerable
});
Type[] allAdditionalInterfaces =
Intercept.GetAllAdditionalInterfaces(enumerable, additionalInterfaces);
Type interceptingType =
interceptor.CreateProxyType(typeToBuild, allAdditionalInterfaces);
DerivedTypeConstructorSelectorPolicy.SetPolicyForInterceptingType(context, interceptingType);
}
public override void PostBuildUp(IBuilderContext context)
{
Microsoft.Practices.Unity.Utility.Guard.ArgumentNotNull(context, "context");
// If it's already been intercepted, don't do it again.
if (context.Existing is IInterceptingProxy)
{
return;
}
IInstanceInterceptionPolicy interceptionPolicy =
FindInterceptionPolicy <IInstanceInterceptionPolicy>(context, true);
if (interceptionPolicy == null)
{
return;
}
var interceptor = interceptionPolicy.GetInterceptor(context);
IInterceptionBehaviorsPolicy interceptionBehaviorsPolicy =
FindInterceptionPolicy <IInterceptionBehaviorsPolicy>(context, true);
if (interceptionBehaviorsPolicy == null)
{
return;
}
IAdditionalInterfacesPolicy additionalInterfacesPolicy =
FindInterceptionPolicy <IAdditionalInterfacesPolicy>(context, false);
IEnumerable <Type> additionalInterfaces =
additionalInterfacesPolicy != null ? additionalInterfacesPolicy.AdditionalInterfaces : Type.EmptyTypes;
Type typeToIntercept = context.OriginalBuildKey.Type;
Type implementationType = context.Existing.GetType();
IInterceptionBehavior[] interceptionBehaviors =
interceptionBehaviorsPolicy.GetEffectiveBehaviors(
context, interceptor, typeToIntercept, implementationType)
.ToArray();
if (interceptionBehaviors.Length > 0)
{
context.Existing =
Intercept.ThroughProxyWithAdditionalInterfaces(
typeToIntercept,
context.Existing,
interceptor,
interceptionBehaviors,
additionalInterfaces);
}
}
internal static AdditionalInterfacesPolicy GetOrCreate(IPolicyList policies,
Type typeToCreate,
string name)
{
NamedTypeBuildKey key = new NamedTypeBuildKey(typeToCreate, name);
IAdditionalInterfacesPolicy policy =
(IAdditionalInterfacesPolicy)policies.Get(typeToCreate, name, typeof(IAdditionalInterfacesPolicy), out _);
if (!(policy is AdditionalInterfacesPolicy))
{
policy = new AdditionalInterfacesPolicy();
policies.Set(typeToCreate, name, typeof(IAdditionalInterfacesPolicy), policy);
}
return((AdditionalInterfacesPolicy)policy);
}
internal static AdditionalInterfacesPolicy GetOrCreate(
IPolicyList policies,
Type typeToCreate,
string name)
{
NamedTypeBuildKey key = new NamedTypeBuildKey(typeToCreate, name);
IAdditionalInterfacesPolicy policy =
policies.GetNoDefault <IAdditionalInterfacesPolicy>(key, false);
if ((policy == null) || !(policy is AdditionalInterfacesPolicy))
{
policy = new AdditionalInterfacesPolicy();
policies.Set <IAdditionalInterfacesPolicy>(policy, key);
}
return((AdditionalInterfacesPolicy)policy);
}
