private static IPlace GetPlace(IConnector connector, IDictionary <long, IPlace> cache)
        {
            IPlace instance;

            if (cache.ContainsKey(connector.Id))
            {
                instance = cache[connector.Id];
            }
            else
            {
                instance            = connector.CreateInstance();
                cache[connector.Id] = instance;
            }
            return(instance);
        }