Queries

gistfile1.txt

namespace Infrastructure
{
    public interface IQueryHandler<TIn, TOut> 
        where TIn : class 
        where TOut : class
    {
        TOut Execute(TIn query);
    }
}

namespace Infrastructure
{
    public class SomethingLikeAFacade : ISomethingLikeAFacade
    {
        private readonly IKernel _kernel;

        public SomethingLikeAFacade(IKernel kernel)
        {
            _kernel = kernel;
        }

        public void ExecuteCommand<T>(T command) where T : class
        {
            var handler = _kernel.Get<ICommandHandler<T>>();

            handler.Handle(command);

            _kernel.Get<IDocumentSession>().SaveChanges();
        }

        public TOut ExecuteQuery<TIn, TOut>(TIn query) where TIn : class where TOut : class
        {
            var handler = _kernel.Get<IQueryHandler<TIn, TOut>>();

            return handler.Execute(query);
        }      
    }
}

namespace Queries
{
    public class GetCategoriesQuery
    {
      public GetCategoriesQuery(string someSearchValue) 
      {
        Guard.ForEmptyString(someSearchValue);

        SomeSearchValue = someSearchValue;
      }

      public string SomeSearchValue { get; private set; }
    }
}

namespace Queries
{
    public class GetCategoriesQueriesHandler : IQueryHandler<GetCategoriesQuery, IEnumerable<Category>>
    {
        private IDocumentSession _session;

        public GetCategoriesQueriesHandler(IDocumentSession session)
        {
            _session = session;
        }

        public IEnumerable<Category> Execute(GetCategoriesQuery query)
        {
            return _session.Query<Category>().Where(x => x.SomeProperty == query.SomeSearchValue).OrderBy(x => x.Title);            
        }
    }
}