/// <summary>
        /// Notifies the kernal that a provider has completed refreshing
        /// </summary>
        /// <param name="provider">The provider.</param>
        /// <param name="item">The item.</param>
        public void OnProviderRefreshCompleted(BaseMetadataProvider provider, BaseItem item)
        {
            var key = item.Id + provider.GetType().Name;

            Tuple<BaseMetadataProvider, BaseItem, CancellationTokenSource> current;

            if (_currentlyRunningProviders.TryRemove(key, out current))
            {
                current.Item3.Dispose();
            }
        }
        /// <summary>
        /// Notifies the kernal that a provider has begun refreshing
        /// </summary>
        /// <param name="provider">The provider.</param>
        /// <param name="item">The item.</param>
        /// <param name="cancellationTokenSource">The cancellation token source.</param>
        public void OnProviderRefreshBeginning(BaseMetadataProvider provider, BaseItem item, CancellationTokenSource cancellationTokenSource)
        {
            var key = item.Id + provider.GetType().Name;

            Tuple<BaseMetadataProvider, BaseItem, CancellationTokenSource> current;

            if (_currentlyRunningProviders.TryGetValue(key, out current))
            {
                try
                {
                    current.Item3.Cancel();
                }
                catch (ObjectDisposedException)
                {

                }
            }

            var tuple = new Tuple<BaseMetadataProvider, BaseItem, CancellationTokenSource>(provider, item, cancellationTokenSource);

            _currentlyRunningProviders.AddOrUpdate(key, tuple, (k, v) => tuple);
        }
        /// <summary>
        /// Fetches metadata and returns true or false indicating if any work that requires persistence was done
        /// </summary>
        /// <param name="provider">The provider.</param>
        /// <param name="item">The item.</param>
        /// <param name="providerInfo">The provider information.</param>
        /// <param name="force">if set to <c>true</c> [force].</param>
        /// <param name="cancellationToken">The cancellation token.</param>
        /// <returns>Task{System.Boolean}.</returns>
        /// <exception cref="System.ArgumentNullException">item</exception>
        private async Task<ItemUpdateType?> FetchAsync(BaseMetadataProvider provider, BaseItem item, BaseProviderInfo providerInfo, bool force, CancellationToken cancellationToken)
        {
            if (item == null)
            {
                throw new ArgumentNullException("item");
            }

            cancellationToken.ThrowIfCancellationRequested();

            // Don't clog up the log with these providers
            if (!(provider is IDynamicInfoProvider))
            {
                _logger.Debug("Running {0} for {1}", provider.GetType().Name, item.Path ?? item.Name ?? "--Unknown--");
            }

            try
            {
                var changed = await provider.FetchAsync(item, force, providerInfo, cancellationToken).ConfigureAwait(false);

                if (changed)
                {
                    return provider.ItemUpdateType;
                }

                return null;
            }
            catch (OperationCanceledException ex)
            {
                _logger.Debug("{0} canceled for {1}", provider.GetType().Name, item.Name);

                // If the outer cancellation token is the one that caused the cancellation, throw it
                if (cancellationToken.IsCancellationRequested && ex.CancellationToken == cancellationToken)
                {
                    throw;
                }

                return null;
            }
            catch (Exception ex)
            {
                _logger.ErrorException("{0} failed refreshing {1} {2}", ex, provider.GetType().Name, item.Name, item.Path ?? string.Empty);

                provider.SetLastRefreshed(item, DateTime.UtcNow, providerInfo, ProviderRefreshStatus.Failure);

                return ItemUpdateType.Unspecified;
            }
        }
        /// <summary>
        /// Fetches metadata and returns true or false indicating if any work that requires persistence was done
        /// </summary>
        /// <param name="provider">The provider.</param>
        /// <param name="item">The item.</param>
        /// <param name="force">if set to <c>true</c> [force].</param>
        /// <param name="cancellationToken">The cancellation token.</param>
        /// <returns>Task{System.Boolean}.</returns>
        /// <exception cref="System.ArgumentNullException"></exception>
        private async Task<ItemUpdateType?> FetchAsync(BaseMetadataProvider provider, BaseItem item, bool force, CancellationToken cancellationToken)
        {
            if (item == null)
            {
                throw new ArgumentNullException();
            }

            cancellationToken.ThrowIfCancellationRequested();

            _logger.Debug("Running {0} for {1}", provider.GetType().Name, item.Path ?? item.Name ?? "--Unknown--");

            // This provides the ability to cancel just this one provider
            var innerCancellationTokenSource = new CancellationTokenSource();

            OnProviderRefreshBeginning(provider, item, innerCancellationTokenSource);

            try
            {
                var changed = await provider.FetchAsync(item, force, CancellationTokenSource.CreateLinkedTokenSource(cancellationToken, innerCancellationTokenSource.Token).Token).ConfigureAwait(false);

                if (changed)
                {
                    return provider.ItemUpdateType;
                }

                return null;
            }
            catch (OperationCanceledException ex)
            {
                _logger.Debug("{0} canceled for {1}", provider.GetType().Name, item.Name);

                // If the outer cancellation token is the one that caused the cancellation, throw it
                if (cancellationToken.IsCancellationRequested && ex.CancellationToken == cancellationToken)
                {
                    throw;
                }

                return null;
            }
            catch (Exception ex)
            {
                _logger.ErrorException("{0} failed refreshing {1}", ex, provider.GetType().Name, item.Name);

                provider.SetLastRefreshed(item, DateTime.UtcNow, ProviderRefreshStatus.Failure);

                return ItemUpdateType.Unspecified;
            }
            finally
            {
                innerCancellationTokenSource.Dispose();

                OnProviderRefreshCompleted(provider, item);
            }
        }
 /// <summary>
 /// Providers the supports item.
 /// </summary>
 /// <param name="provider">The provider.</param>
 /// <param name="item">The item.</param>
 /// <returns><c>true</c> if XXXX, <c>false</c> otherwise</returns>
 private bool ProviderSupportsItem(BaseMetadataProvider provider, BaseItem item)
 {
     try
     {
         return provider.Supports(item);
     }
     catch (Exception ex)
     {
         _logger.ErrorException("{0} failed in Supports for type {1}", ex, provider.GetType().Name, item.GetType().Name);
         return false;
     }
 }