Raven.ManagedStorage.Degenerate.PersistentDictionary.AddInteral C# (CSharp) Method

        private void AddInteral(JToken key, PositionInFile position)
        {
            keyToFilePos.AddOrUpdate(key, position, (token, oldPos) =>
            {
                WasteCount += 1;
                return position;
            });
            lock (index)
                index.Add(key);
        }