using System;

using System.Collections.Generic;

using System.Dynamic;

using System.Linq;

using System.Text;

using System.Threading;

namespace Simple.Data

{

internal class ConcreteObject

{

private static readonly object CastFailureObject = new object();

private WeakReference _concreteObject;

public object Get(Type type, IDictionary<string,object> data)

{

if (_concreteObject == null || !_concreteObject.IsAlive)

{

return ConvertAndCacheReference(type, data);

}

if (!ReferenceEquals(CastFailureObject, _concreteObject.Target))

{

return _concreteObject.Target;

}

return null;

}

private object ConvertAndCacheReference(Type type, IDictionary<string, object> data)

{

_concreteObject = null;

object result;

if (ConcreteTypeCreator.Get(type).TryCreate(data, out result))

{

Interlocked.CompareExchange(ref _concreteObject, new WeakReference(result), null);

return _concreteObject.Target;

}

Interlocked.CompareExchange(ref _concreteObject, new WeakReference(CastFailureObject), null);

return null;

}

}

}