/// <summary>
/// Bootstrap the task scheduler - configuring all the background scheduled tasks
/// that we'll want to run periodically, such as indexing, thumbnail generation,
/// cleanup of temporary download files, etc., etc.
/// </summary>
private static void StartTaskScheduler(TaskService taskScheduler, DownloadService download,
ThumbnailService thumbService, ExifService exifService)
{
var tasks = new List <ScheduledTask>();
// Clean up old/irrelevant thumbnails once a week
var thumbCleanupFreq = new TimeSpan(7, 0, 0, 0);
tasks.Add(new ScheduledTask
{
Type = ScheduledTask.TaskType.CleanupThumbs,
ExecutionFrequency = thumbCleanupFreq,
WorkMethod = () => thumbService.CleanUpThumbnails(thumbCleanupFreq),
ImmediateStart = false
});
// Clean up old download zips from the wwwroot folder
var downloadCleanupFreq = new TimeSpan(6, 0, 0);
tasks.Add(new ScheduledTask
{
Type = ScheduledTask.TaskType.CleanupDownloads,
ExecutionFrequency = downloadCleanupFreq,
WorkMethod = () => download.CleanUpOldDownloads(downloadCleanupFreq),
ImmediateStart = false
});
// Purge keyword operation entries that have been processed
var keywordCleanupFreq = new TimeSpan(24, 0, 0);
tasks.Add(new ScheduledTask
{
Type = ScheduledTask.TaskType.CleanupKeywordOps,
ExecutionFrequency = new TimeSpan(12, 0, 0),
WorkMethod = () => { _ = exifService.CleanUpKeywordOperations(keywordCleanupFreq); },
ImmediateStart = false
});
// Dump performance stats out to the logfile
tasks.Add(new ScheduledTask
{
Type = ScheduledTask.TaskType.DumpPerformance,
ExecutionFrequency = new TimeSpan(24, 0, 0),
WorkMethod = () => Stopwatch.WriteTotals(false),
ImmediateStart = false
});
#if false
// Disabled for now, don't think it's really required.
// Flush the DB WriteCache (currently a no-op except for SQLite) ever 2 hours
tasks.Add(new ScheduledTask
{
Type = ScheduledTask.TaskType.FlushDBWriteCache,
ExecutionFrequency = new TimeSpan(2, 0, 0),
WorkMethod = () =>
{
using var db = new ImageContext();
db.FlushDBWriteCache();
}
});