private void UpdateStates(StateSnapshot states)
{
this.UpdateStatusRows(states);
this.UpdateLogRows(states.AllPeerGroups);
// This isn't a dependency property, so we can't bind to it. We have to manually update it.
TimeSpan monitored = this.stateManager.Monitored;
monitored = ConvertUtility.RoundToSeconds(monitored);
this.monitoredTime.Text = monitored.ToString();
// Optionally, simulate a failure when ScrollLock is toggled on.
this.simulateFailure = this.CommonOptions.ScrollLockSimulatesFailure && Keyboard.IsKeyToggled(Key.Scroll);
}
private void BackgroundTimerCallback(object state)
{
// Only let one Update run at a time. If the callback takes longer than 1 second, it will be invoked again from another thread.
if (!this.closing && Interlocked.CompareExchange(ref this.updatingLock, 1, 0) == 0)
{
try
{
StateSnapshot states = this.stateManager.Update(this.simulateFailure);
this.Dispatcher.BeginInvoke(new Action(() => this.UpdateStates(states)));
}
finally
{
Interlocked.Exchange(ref this.updatingLock, 0);
}
}
}
private void BackgroundTimerCallback(object state)
{
// Only let one Update run at a time. If the callback takes longer than 1 second, it will be invoked again from another thread.
if (!this.closing && Interlocked.CompareExchange(ref this.updatingLock, 1, 0) == 0)
{
try
{
StateSnapshot states = this.stateManager.Update(this.simulateConnection);
this.Dispatcher.BeginInvoke(new Action(() => this.UpdateStates(states)));
}
#pragma warning disable CA1031 // Do not catch general exception types. Timer callback has to catch all to prevent program termination.
catch (Exception ex)
#pragma warning restore CA1031 // Do not catch general exception types
{
// If we don't handle all exceptions here, then the app will go away and log a .NET Runtime error in the event log like:
// "The process was terminated due to an unhandled exception."
Log.Error(this.GetType(), "An unhandled exception occurred on the background timer thread.", ex);
}
finally
{
Interlocked.Exchange(ref this.updatingLock, 0);
}
}
}