/// <summary>
/// Run the background tagger.
/// </summary>
/// <returns></returns>
public Task Run()
{
TaskFactory tf = new TaskFactory(TaskCreationOptions.LongRunning, TaskContinuationOptions.None);
CancellationToken cancel = _cancel.Token;
return(tf.StartNew(() =>
{
TraceLogger.Log(TraceCategory.Info(), "Background tagging service started");
try
{
OneNotePageProxy lastPage = null;
while (!_jobs.IsCompleted)
{
TaggingJob j = _jobs.Take();
cancel.ThrowIfCancellationRequested();
try
{
lastPage = j.Execute(_onenote, lastPage);
if (lastPage != null && _jobs.Count == 0)
{ // no more pending pages - must update the last one and stop carrying forward
lastPage.Update();
lastPage = null;
}
}
catch (Exception e)
{
lastPage = null;
TraceLogger.ShowGenericErrorBox("page tagging failed", e);
}
}
}
catch (InvalidOperationException)
{
TraceLogger.Log(TraceCategory.Warning(), "Background tagging job queue depleted");
TraceLogger.Flush();
}
catch (OperationCanceledException)
{
TraceLogger.Log(TraceCategory.Warning(), "Background tagging canceled");
TraceLogger.Flush();
}
}, cancel));
}
/// <summary>
/// Schedule a tagging job for background operation.
/// </summary>
/// <param name="job">Tagging job descriptor</param>
public void Add(TaggingJob job)
{
_jobs.Add(job);
}