Creating a custom Collection Resolver sounds promising.
So I see that the existing logic for detecting cycles is in DefaultHandler.
IsBeingResolvedInContext uses the CreationContext to find
out context.IsInResolutionContext(this); which tells it if the handler is
already being resolved in the context.
Makes sense. But in the context of a SubDependencyResolver that I would be
writing (or overriding CollectionResolver), how do i get at the handler? I
think I don't understand enough about what step in the resolution lifecycle
the subdependencyresolver is invoked...
On Wednesday, 17 April 2013 22:21:51 UTC-7, Krzysztof Koźmic wrote:
>
> so I think what you want is a custom Collection resolver that checks if a
> IHandler is already in the graph and then ignores it. There's a method on
> ResolutionContext or similar that does that
>
>
> HTH
> --
> Krzysztof Kozmic
>
> On Wednesday, 17 April 2013 at 3:26 PM, Nik Pinski wrote:
>
> I have a generic repository (the generic type parameter being the
> aggregate root type being serialized to the database [mongo]).
>
> The repository takes a parameter which in an IEnumerable of ISync
> services. Low-level database actions may need to be synchronized to other
> data, and implementors of ISync will do that.
>
> Some psudeocode:
>
> class Repository<T>
> {
> public Repository(IEnumerable<ISync<T>> synchronizers)
> {
> ...
> }
>
> public void Save(T data)
> {
> database.Save(data);
> foreach(synchronizer in _syncrhonizers)
> {
> synchronizer.Sync(data);
> }
> }
> }
>
> class SomeRandomSync : ISync<ObjectA>
> {
> public void Sync(ObjectAdata)
> {
> //do something with that object perhaps even use another repository
> new Repository<ObjectB>().Save(objectB); //Obviously this is a
> constructor injection, I'm just keeping it simple
> }
> }
>
> Most objects don't have an ISync<T> implementation, so the synchronizers
> do nothing.
>
> However whenever dealing with such low level injected dependencies there
> can easily be a dependency cyle. What if there is an implementation of
> ISync<ObjectB> that, when syncing ObjectBdecides to Save ObjectA? Well, an
> infinite loop of saves and re-saves that LUCKILY, Castle Windsor would
> identify ahead of time and tell you "Hey, you've got a dependency cycle and
> you're doing something wrong."
>
> Luckily only 99% of the time, though, because in my case i don't WANT it
> to cause a cyclical dependency, I just want that particular ISync<T>
> service to be ignored. I want to allow the developers using this code to
> be able to create those dependency cycles (sometimes they are quite
> necessary because SOME implementors of ISync need to be called, and some
> should just be ignored if they can't be - they will surely not cause a
> cycle in another situation.
>
> I tried to do something like this but to no avail
> (StackOverflowException). Do I have any recourse?
>
> public Repository(IWindsorContainer windsorContainer)
> {
> var handlers =
> windsorContainer.Kernel.GetHandlers(typeof(ISync<T>));
>
> var syncers = new List<object>();
> foreach (var handler in handlers)
> {
> try
> {
> object syncer=
> handler.TryResolve(CreationContext.CreateEmpty());
> syncers.Add(syncer);
> }
> catch
> {
> }
> }
>
> _syncers = syncers;
> }
>
> --
> You received this message because you are subscribed to the Google Groups
> "Castle Project Users" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to [email protected] <javascript:>.
> To post to this group, send email to
> [email protected]<javascript:>
> .
> Visit this group at
> http://groups.google.com/group/castle-project-users?hl=en.
> For more options, visit https://groups.google.com/groups/opt_out.
>
>
>
>
>
--
You received this message because you are subscribed to the Google Groups
"Castle Project Users" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/castle-project-users?hl=en.
For more options, visit https://groups.google.com/groups/opt_out.
