private void ConnectButton_Click(object sender, RoutedEventArgs args)
{
try
{
// Clear any previous connection error
ClearConnectionStatusLabel();
bool isSecure = SecureConnectionCheckBox.IsChecked.HasValue && SecureConnectionCheckBox.IsChecked.Value;
// Saving user input to disk
var persistor = new UserInputPersistor
{
Host = m_host,
Exchange = m_exchange,
TopicPattern = TopicTextBox.Text,
Username = UsernameTextBox.Text,
IsSecureConnection = isSecure
};
UserInputPersistor.Save(persistor);
// Updating UI state
ChangeUiState(canConnect: false, canTerminate: true);
try
{
// Connecting
var connRequest = new ConnectionRequest(host: m_host, exc: m_exchange, secure: isSecure,
user: UsernameTextBox.Text, pwd: PasswordTextBox.Password, topic: TopicTextBox.Text);
m_appLogic.Connect(connRequest);
}
catch (InvalidOperationException e)
{
// Showing the error in UI
SetConnectionStatusText(text: e.Message, isProblem: true);
return;
}
args.Handled = true;
}
catch (Exception e)
{
HandleBug(e);
}
}
/// <summary>
/// Opens a connection.
/// </summary>
/// <param name="connRequest">Connection request.</param>
/// <exception cref="InvalidOperationException">Thrown if object state is invalid.</exception>
/// <exception cref="ObjectDisposedException">Thrown if the object has been disposed.</exception>
public void Connect(ConnectionRequest connRequest)
{
ExpectNotDisposed(); // throws ObjectDisposedException
// Locking a relatively large amount of code. However, none of the operations
// is expected to last long, and a race condition must not occur.
lock (m_amqpClientLock)
{
if (m_amqpClient != null)
{
throw new InvalidOperationException("Connection already open");
}
// Creating the client object. Using a lock to synchronise the variable between threads.
m_amqpClient = CreateAmqpClient(connRequest);
// Connecting. This is not within a lock, as the connect operation
// supposedly can take relatively long or at least cause a deadlock in this class.
m_amqpClient.Connect(connRequest);
}
}