ModelManager.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;

namespace JSONAPI.Core
{
    public class ModelManager : IModelManager
    {
        public ModelManager() { }

        #region Cache storage

        private Lazy<Dictionary<Type, PropertyInfo>> _idProperties
            = new Lazy<Dictionary<Type,PropertyInfo>>(
                () => new Dictionary<Type, PropertyInfo>()
            );

        #endregion

        #region Id property determination

        public PropertyInfo GetIdProperty(Type type)
        {
            PropertyInfo idprop = null;

            var idPropCache = _idProperties.Value;

            lock (idPropCache)
            {
                if (idPropCache.TryGetValue(type, out idprop)) return idprop;

                //TODO: Enable attribute-based determination

                idprop = type.GetProperty("Id");

                if (idprop == null)
                    throw new InvalidOperationException(String.Format("Unable to determine Id property for type {0}", type));

                idPropCache.Add(type, idprop);
            }

            return idprop;
        }

        #endregion
    }
}