/// <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;
}
}