Cached Reader decorator

gistfile1.cs

public class AsdController : BaseController {
    private IReader<Encrypted, SalesObject> Reader { get; private set; }

    public AsdController(IReader<Encrypted, SalesObject> reader) {
        Reader = reader;

        if (base.UseCaching) {
            Reader = new CachedReader<Encrypted, SalesObject>(Reader);
        }
    }

    [HttpGet]
    public ActionResult Get(Encrypted id) {
        var salesObject = Reader.get(id);
        
        return View(salesObject);
    }
}

public interface IReader<Key, Value> {
    Value Get(Key key);
}

public interface ICache<Key, Value> {
    Value Store(Key key, Func<Key, Value> getter);
}

public class CachedReader<Key, Value> : IReader<Key, Value> {
    private IReader<Key, Value> _reader;
    private ICache<Key, Value> _cache;

    public CachedReader(IReader<Key, Value> reader) {
        _reader = reader;
        _cache = new ItemCache<Key, Value>();
    }

    public Value Get(Key key) {
        return _cache.Store(key, _reader.Get);
    }
}