protected void ProcessQueuedMessages(XmlStream xml, CancellationToken canceltoken)
{
Message msg;
while (!canceltoken.IsCancellationRequested && QueuedMessages.TryDequeue(out msg))
{
foreach (XElement el in msg.Content)
{
if (el.Name.ToString() == "{google:push}push")
{
string channel = el.Attribute("channel").Value;
if (Subscriptions.ContainsKey(channel))
{
Logger.Log(LogLevel.Debug, "Handling message for channel {0}", channel);
Subscriptions[channel](el, this);
}
else
{
Logger.Log(LogLevel.Debug, "Message for unknown channel {0}", channel);
}
}
}
}
canceltoken.ThrowIfCancellationRequested();
}
public void Purge()
{
MessageWrapper msg;
while (QueuedMessages.TryDequeue(out msg))
{
Persistence.DeleteMessage(msg);
}
}
private Task StartService(CancellationToken cancellationToken)
{
try
{
var dispatcher = Application.Current.MainWindow.Dispatcher;
return(Task.Factory.StartNew(async() =>
{
do
{
// Gets the next display location in the screen
int nextLocation = FindNextLocation();
if (nextLocation > -1)
{
NotifyMessage msg = null;
// Retrieve the message from the queue
if (QueuedMessages.TryDequeue(out msg))
{
// construct a View Model and binds it to the Popup Window
var viewModel = new NotifyMessageViewModel(msg,
DisplayLocations[nextLocation],
() => DisplayMessages[nextLocation] = null); // Free the display location when the popup window is closed
DisplayMessages[nextLocation] = viewModel;
// Use Application.Current.MainWindow.Dispatcher to switch back to the UI Thread to create popup window
await dispatcher.BeginInvoke(
new MethodInvoker(() =>
{
var window = new AlertDialog()
{
Owner = Application.Current.MainWindow,
DataContext = viewModel,
ShowInTaskbar = false
};
window.Show();
}), DispatcherPriority.Background);
}
}
await Task.Delay(1000);
} while (QueuedMessages.Count > 0 && !cancellationToken.IsCancellationRequested);
Stop();
}));
}
catch
{
return(null);
}
}
public bool Dequeue(out MessageWrapper wrapper)
{
return(QueuedMessages.TryDequeue(out wrapper));
}