public void AddWatcher(Watcher watcher)
{
if (watcher == null)
{
return;
}
FSWatcher fsWatcher;
try {
fsWatcher = new FSWatcher(watcher);
} catch (Exception e)
{
throw new AddFailure($"Failed to add watcher with Id {watcher.Id}.", e);
}
if (fsWatcher == null)
{
return;
}
FSWatcherTaskPack pack = new FSWatcherTaskPack
{
Watcher = watcher,
FSWatcher = fsWatcher,
};
var waitStop = fsWatcher.StartAndWait();
pack.Task = waitStop;
waitStop.ContinueWith(HandleFailedWatch, pack, TaskContinuationOptions.OnlyOnFaulted);
watchers.Add(watcher.Id, pack);
}
private void HandleFailedWatch(Task t, object o)
{
FSWatcherTaskPack pack = (FSWatcherTaskPack)o;
lock (pack)
{
pack.Failures += 1;
pack.LastError = t.Exception.ToString();
Console.WriteLine($"Failed. Watcher has had {pack.Failures} failure(s). Got exception: {t.Exception}");
if (!watchers.ContainsKey(pack.Watcher.Id))
{
return;
}
Console.WriteLine("Restarting.");
Thread.Sleep(WaitInterval);
Console.WriteLine("Wait finished. Restarting watcher.");
FSWatcher fsWatcher = new FSWatcher(pack.Watcher);
pack.FSWatcher = fsWatcher;
if (!watchers.ContainsKey(pack.Watcher.Id))
{
return;
}
// TODO: there is a still a race condition here... eventually use a disable flag on the watcher model.
var waitStop = fsWatcher.StartAndWait();
pack.Task = waitStop;
waitStop.ContinueWith(HandleFailedWatch, pack, TaskContinuationOptions.OnlyOnFaulted);
}
}