/// <summary>
/// Called when exception happens in a GUI routine
/// </summary>
private void OnGuiUnhandledException(object sender, System.Windows.Threading.DispatcherUnhandledExceptionEventArgs e)
{
bool userLevel;
string message = ExceptionMessage.GetUserMessage(e.Exception, out userLevel);
if (userLevel)
{
// TODO FIX NOW would really like to find the window with focus, and not always use the main window...
MainWindow.Focus();
MainWindow.StatusBar.LogError(message);
e.Handled = true;
}
else
{
var feedbackSent = AppLog.SendFeedback("Unhandled Exception in GUI\r\n" + e.Exception.ToString(), true);
var dialog = new PerfView.Dialogs.UnhandledExceptionDialog(MainWindow, e.Exception, feedbackSent);
var ret = dialog.ShowDialog();
// If it returns, it means that the user has opted to continue.
e.Handled = true;
}
}
/// <summary>
/// This starts long running work. It is called on the GUI thread.
/// Only one piece of work can be running at a time (this is simply to keep the
/// model the user sees simple).
///
/// If finally_ is present, it will be run at EndWork time (But before the
/// 'response' delegate passed to EndWork). Logically it is a finally clause associated
/// with the work (but not the 'response') Unlike 'response' this action
/// will occur under ALL conditions, including cancellation. it is used for other
/// GUID indications that work is in progress.
///
/// If 'finally_' is present it will be executed on the GUI thread.
/// </summary>
public void StartWork(string message, Action work, Action finally_ = null)
{
// We only call this from the GUI thread
if (Dispatcher.Thread != Thread.CurrentThread)
{
throw new InvalidOperationException("Work can only be started from the UI thread.");
}
// Because we are only called on the GUI thread, there is no race.
if (m_work != null)
{
// PerfViewLogger.Log.DebugMessage("Must cancel " + m_workMessage + " before starting " + message);
LogError("Must first cancel: " + m_workMessage + " before starting " + message);
return;
}
// PerfViewLogger.Log.DebugMessage("Starting Working " + message);
m_abortStarted = false;
m_abortDidInterrupt = false;
m_endWorkStarted = false;
m_endWorkCompleted = false;
m_worker = null;
m_finally = finally_;
if (m_parentWindow == null)
{
m_parentWindow = Helpers.AncestorOfType <Window>(this);
}
if (m_parentWindow != null)
{
m_origCursor = m_parentWindow.Cursor;
m_parentWindow.Cursor = System.Windows.Input.Cursors.Wait;
}
// Update GUI state
m_workTimeSec = 0;
m_startTime = DateTime.Now;
m_timer.IsEnabled = true;
m_CancelButton.IsEnabled = true;
m_workMessage = message;
m_ProgressText.Text = "Working";
Background = m_blinkColor;
var completeMessage = "Started: " + message;
Status = completeMessage;
LogWriter.WriteLine(completeMessage);
m_loggedStatus = false;
// This part may take a little bit of time, so we pass it off to another
// thread (to keep the UI responsive, and then when it is done call
// back (this.BeginInvoke), to finish it off.
var currentCulture = CultureInfo.CurrentCulture;
var currentUICulture = CultureInfo.CurrentUICulture;
var workSemaphore = new SemaphoreSlim(1);
workSemaphore.Wait();
m_work = Task.Run(() =>
{
// Wait for the m_work variable to actually get assigned
workSemaphore.Wait();
var oldCulture = Tuple.Create(CultureInfo.CurrentCulture, CultureInfo.CurrentUICulture);
try
{
Thread.CurrentThread.CurrentCulture = currentCulture;
Thread.CurrentThread.CurrentUICulture = currentUICulture;
try
{
try
{
m_worker = Thread.CurrentThread; // At this point we can be aborted.
// If abort was called before m_worker was initialized we need to kill this thread ourselves.
if (m_abortStarted)
{
throw new ThreadInterruptedException();
}
work();
Debug.Assert(m_endWorkStarted, "User did not call EndWork before returning from work body.");
}
catch (Exception ex)
{
EndWork(delegate()
{
if (!(ex is ThreadInterruptedException))
{
bool userLevel;
var errorMessage = ExceptionMessage.GetUserMessage(ex, out userLevel);
if (userLevel)
{
LogError(errorMessage);
}
else
{
Log(errorMessage);
LogError("An exceptional condition occurred, see log for details.");
}
}
});
}
Debug.Assert(m_worker == null || m_abortStarted); // EndWork should have been called and nulled this out.
// If we started an abort, then a thread-interrupt might happen at any time until the abort is completed.
// Thus we should wait around until the abort completes.
if (m_abortStarted)
{
while (!m_abortDidInterrupt)
{
Thread.Sleep(1);
}
}
}
catch (ThreadInterruptedException) { } // we 'expect' ThreadInterruptedException so don't let them leak out.
// Cancellation completed, means that the thread is dead. We don't allow another work item on this StatusBar
// The current thread is dead.
Debug.Assert(m_endWorkStarted);
if (m_abortStarted)
{
Log("Cancellation Complete on thread " + Thread.CurrentThread.ManagedThreadId + " : (Elapsed Time: " + Duration.TotalSeconds.ToString("f3") + " sec)");
}
}
finally
{
Thread.CurrentThread.CurrentCulture = oldCulture.Item1;
Thread.CurrentThread.CurrentUICulture = oldCulture.Item2;
}
});
// Now that m_work is assigned, allow the operation to proceed
workSemaphore.Release();
SignalPropertyChange(nameof(IsWorking));
SignalPropertyChange(nameof(IsNotWorking));
}