/// <summary>
        /// Called when the configuration source has been requested and must prepare for resolution.
        /// </summary>
        /// <exception cref="ConfigurationException"></exception>
        public void Load()
        {
            sync.EnterWriteLock();

            try
            {
                switch (source)
                {
                case JsonSource.File:
                    using (var reader = new StreamReader(path.FullName))
                        using (var content = new JsonTextReader(reader))
                        {
                            document = serializer.Deserialize <JObject>(content);
                        }
                    break;

                case JsonSource.Stream:
                    using (var reader = new StreamReader(stream))
                        using (var content = new JsonTextReader(reader))
                        {
                            document = serializer.Deserialize <JObject>(content);
                        }
                    break;
                }
            }
            catch (Exception ex)
            {
                throw new ConfigurationException($"Cannot load a {source.ToString().ToLower()} JSON document", ex);
            }
            finally
            {
                sync.ExitWriteLock();
            }
        }