private void DoWork()
{
while (!_token.IsCancellationRequested)
{
using (var m = new SqlChangeTrackerModel())
{
foreach (var tt in m.TrackedRows1.ToList())
{
try
{
var queryStopwatch = Stopwatch.StartNew();
var changes = tt.GetChangesFromVersion().ToList();
queryStopwatch.Stop();
var publishStopwatch = Stopwatch.StartNew();
_onChange(tt, changes);
publishStopwatch.Stop();
foreach (var change in changes)
{
if (change.SYS_CHANGE_VERSION > (tt.Version ?? 0))
{
tt.Version = change.SYS_CHANGE_VERSION;
}
}
tt.LastRun = DateTime.Now;
if (changes.Any())
{
Trace.WriteLine(string.Format("{0}: {1} changes. query took {2}, publish took {3}", tt.GetFullName(), changes.Count(), queryStopwatch.Elapsed.ToString(), publishStopwatch.Elapsed.ToString()));
}
m.SaveChanges();
}
catch (Exception ex)
{
Trace.WriteLine(ex.ToString());
}
}
}
Trace.WriteLine(string.Format("Sleeping for {0}", _interval));
_token.WaitHandle.WaitOne(_interval);
}
}
public Tracker(Action <TrackedRow, List <RowChange> > onChange, CancellationToken token)
{
_interval = TimeSpan.Parse(System.Configuration.ConfigurationManager.AppSettings["PollInterval"]);
_token = token;
_onChange = onChange;
using (var m = new SqlChangeTrackerModel())
{
foreach (var tt in m.TrackedRows1)
{
if (!string.IsNullOrEmpty(tt.Table))
{
tt.EnableChangeTracking(); // table-based tracking only
}
}
}
_task = Task.Run(() => { DoWork(); }, _token);
}
