public static ICommentService CreateCommentService(Container parentContainer, Container configurationContainer)
{
var container = new Container();
container.RegisterInstance(SourceProvider.CommentSource(parentContainer));
var config = configurationContainer.GetInstance <INewsFeedConfiguration>();
ICacheService <PostId, IEnumerable <Comment> > cache =
CacheServiceBuilder <PostId, IEnumerable <Comment> > .CreateService(config.CommentInvalidationTime, CacheItemPriority.Default);
container.Register <ICommentService, CommentService>();
container.RegisterInstance(cache);
container.Verify();
return(container.GetInstance <ICommentService>());
}