public interface IReviewGrabber : IDependency
{
    IEnumerable<ReviewPart> Reviews { get; }
}

public class ReviewGrabber : IReviewGrabber
{
    readonly IOrchardServices _orchardServices;
    readonly IEnumerable<ReviewPart> _reviews;

    public ReviewGrabber(IOrchardServices orchardServices)
    {
        _orchardServices = orchardServices;
        var temp = _orchardServices.ContentManager.Query<ReviewPart, ReviewRecord>();
        _reviews = temp.List();
    }

    public IEnumerable<ReviewPart> Reviews
    {
        get { return _reviews; }
    }
}

public class ReviewHandler : ContentHandler
{
    public ReviewHandler(IRepository<ReviewRecord> repository)
    {
        Filters.Add(StorageFilter.For(repository));
    }
}

public IEnumerable<IContentHandler> Handlers {
     get { return _handlers.Value; }
}