public static void InitializeDependencies(this IMobileObject obj)
{
if (obj == null)
{
throw new ArgumentNullException("Injection of dependencies cannot be performed in a 'null' instance.");
}
IBusinessScope scopedObject = obj as IBusinessScope;
if (scopedObject != null)
{
if (scopedObject.Scope == null)
{
throw new ArgumentNullException("obj", "An instance of IMobileObject that also implements IBusinessScope needs to have the Scope set before you can call InitializeDependencies on it!");
}
scopedObject.ReflectProperties(DPABindingFlags)
.Where(pi => Attribute.IsDefined(pi, typeof(DependencyAttribute)))
.ToList <PropertyInfo>()
.ForEach(pi =>
{
DependencyAttribute atb = pi.GetCustomAttribute <DependencyAttribute>();
if (scopedObject.Scope.IsRegistered(pi.PropertyType))
{
object depPropInstance = scopedObject.Scope.Resolve(pi.PropertyType);
if ((atb.DependencyScope == ResolutionScope.Client || atb.DependencyScope == ResolutionScope.ClientAndServer) && typeof(IDisposable).IsAssignableFrom(depPropInstance.GetType()))
{
IComponentRegistration reg = scopedObject.Scope
.ComponentRegistry
.RegistrationsFor(new TypedService(pi.PropertyType))
.Where(e => e.Ownership == InstanceOwnership.ExternallyOwned).FirstOrDefault();
if (reg == null)
{
throw new ConcreteTypeResolutionException(obj.GetType(), "Did not find a registration for given type.");
}
}
pi.SetValue(obj, depPropInstance);
}
});
}
}
//disposes the scoped objects ILifetimeScope and sets all dependency properties to null
public static void FinalizeDependencies(this IMobileObject obj)
{
if (obj == null)
{
throw new ArgumentNullException("Object to be processed for dependency injection cannot be 'null'.");
}
IBusinessScope scopedObject = obj as IBusinessScope;
if (scopedObject != null)
{
if (scopedObject.Scope != null)
{
//if the scope is disposed the dependency that was resolved from it will get disposed as well -
//we need to ensure that the dependencies we bring back from the client do NOT implememnt IDisposable
//OR - if they do - we need to ensure that the container was registered to not track the client dependency
//(this happens in the
scopedObject.Scope.Dispose();
scopedObject.Scope = null;
scopedObject.ReflectProperties(DPABindingFlags)
.Where(pi => Attribute.IsDefined(pi, typeof(DependencyAttribute)))
.ToList <PropertyInfo>()
.ForEach(pi =>
{
DependencyAttribute atb = pi.GetCustomAttribute <DependencyAttribute>();
//we only clear out the scoped object if it is only used on the server side
//we checked for IDisposable and made sure that the client side dependency was not being tracked by
//the server side resolution in Autofac when InitializeObject was called so we will be okay to not clear it out
//and do not need to worry about it getting disposed here as well
if (atb.DependencyScope == ResolutionScope.Server)
{
pi.SetValue(scopedObject, null);
}
});
}
}
}