/// <summary>
/// Processor to drain the folder queue and update the DB. This
///
/// </summary>
/// <returns></returns>
private async Task FolderQueueProcessor()
{
// Process the queue every 30s
var timer = new PeriodicTimer(TimeSpan.FromSeconds(30));
while (true)
{
// Wait until the next iteration
await timer.WaitForNextTickAsync();
// First, take all the queued folder changes and persist them to the DB
// by setting the FolderScanDate to null.
var folders = new List <string>();
while (folderQueue.TryDequeue(out var folder))
{
Logging.Log($"Flagging change for folder: {folder}");
folders.Add(folder);
}
if (_indexingService != null && folders.Any())
{
using var db = new ImageContext();
var uniqueFolders = folders.Distinct(StringComparer.OrdinalIgnoreCase);
var pendingFolders = db.Folders.Where(f => uniqueFolders.Contains(f.Path)).ToList();
// Call this method synchronously, we don't want to continue otherwise
// we'll end up with race conditions as the timer triggers while
// the method is completing.
_indexingService.MarkFoldersForScan(pendingFolders).Wait();
}
}
}