public MainWindow()
{
InitializeComponent();
DataContext = this;
ServerUrl = "http://localhost:8080";
Service = new LibraryAdminService(ServerUrl);
ClientListener = new WebSocketClient(ServerUrl);
ClientListener.NotificationReceived += ClientListenerNotified;
ClientListener.ListenAsync();
Gadgets = new ObservableCollection<Gadget>(Service.GetAllGadgets());
Loans = new ObservableCollection<Loan>(Service.GetAllLoans());
InputComboCondition.ItemsSource = Enum.GetValues(typeof(domain.Condition)).Cast<domain.Condition>();
}
public void Connect()
{
if (_connected) return;
try
{
ServiceUrl = "http://localhost:8080";
_libraryAdminService = new LibraryAdminService(ServiceUrl);
_connected = true;
LoadData();
RefreshComponents();
StatusBarInfo.Content = $"Connected to {ServiceUrl}";
StatusBar.Background = new SolidColorBrush(Color.FromArgb(0xFF, 0x07, 0x78, 0xB5));
HideLoadingScreen();
var client = new WebSocketClient(ServiceUrl);
client.NotificationReceived += (o, e) =>
{
Debug.WriteLine("WebSocket::Notification: " + e.Notification.Target + " > " + e.Notification.Type);
// demonstrate how these updates could be further used
if (e.Notification.Target == typeof(Gadget).Name.ToLower())
{
var gadget = e.Notification.DataAs<Gadget>();
var oldGadget = Gadgets.Find(g => g.InventoryNumber == gadget.InventoryNumber);
Gadgets.Remove(oldGadget);
if (e.Notification.Type != WebSocketClientNotificationTypeEnum.Delete)
{
Gadgets.Add(gadget);
}
} else if (e.Notification.Target == typeof(Reservation).Name.ToLower())
{
var reservation = e.Notification.DataAs<Reservation>();
var oldReservation = Reservations.Find(r => r.Id == reservation.Id);
Reservations.Remove(oldReservation);
reservation.Customer = Customers.Find(c => c.Studentnumber == reservation.CustomerId);
reservation.Gadget = Gadgets.Find(c => c.InventoryNumber == reservation.GadgetId);
if (e.Notification.Type != WebSocketClientNotificationTypeEnum.Delete)
{
Reservations.Add(reservation);
}
} else if (e.Notification.Target == typeof(Loan).Name.ToLower())
{
var loan = e.Notification.DataAs<Loan>();
var oldLoans = Loans.Find(l => l.Id == loan.Id);
Loans.Remove(oldLoans);
loan.Customer = Customers.Find(c => c.Studentnumber == loan.CustomerId);
loan.Gadget = Gadgets.Find(c => c.InventoryNumber == loan.GadgetId);
if (e.Notification.Type != WebSocketClientNotificationTypeEnum.Delete)
{
Loans.Add(loan);
}
}
LoadModels();
UpdateView();
HideLoadingScreen();
};
// spawn a new background thread in which the websocket client listens to notifications from the server
try
{
var bgTask = client.ListenAsync();
}
catch (WebSocketException e)
{
ShowErrorScreen();
}
}
catch (Exception e)
{
_connected = false;
StatusBarInfo.Content = $"Can't connect to {ServiceUrl} - Click here to reconnect";
StatusBar.Background = new SolidColorBrush(Color.FromArgb(0xFF, 0xFF, 0x62, 0x1F));
}
}