/// <summary>
/// Updates the status control when a keep alive event occurs.
/// </summary>
void StandardClient_KeepAlive(Session sender, KeepAliveEventArgs e)
{
if (InvokeRequired)
{
BeginInvoke(new KeepAliveEventHandler(StandardClient_KeepAlive), sender, e);
return;
}
else if (!IsHandleCreated)
{
return;
}
if (sender != null && sender.Endpoint != null)
{
ServerUrlLB.Text = Utils.Format(
"{0} ({1}) {2}",
sender.Endpoint.EndpointUrl,
sender.Endpoint.SecurityMode,
(sender.EndpointConfiguration.UseBinaryEncoding)?"UABinary":"XML");
}
else
{
ServerUrlLB.Text = "None";
}
if (e != null && m_session != null)
{
if (ServiceResult.IsGood(e.Status))
{
ServerStatusLB.Text = Utils.Format(
"Server Status: {0} {1:yyyy-MM-dd HH:mm:ss} {2}/{3}",
e.CurrentState,
e.CurrentTime.ToLocalTime(),
m_session.OutstandingRequestCount,
m_session.DefunctRequestCount);
ServerStatusLB.ForeColor = Color.Empty;
ServerStatusLB.Font = new Font(ServerStatusLB.Font, FontStyle.Regular);
}
else
{
ServerStatusLB.Text = String.Format(
"{0} {1}/{2}", e.Status,
m_session.OutstandingRequestCount,
m_session.DefunctRequestCount);
ServerStatusLB.ForeColor = Color.Red;
ServerStatusLB.Font = new Font(ServerStatusLB.Font, FontStyle.Bold);
if (m_reconnectPeriod <= 0)
{
return;
}
if (m_reconnectHandler == null && m_reconnectPeriod > 0)
{
m_reconnectHandler = new SessionReconnectHandler();
m_reconnectHandler.BeginReconnect(m_session, m_reconnectPeriod * 1000, StandardClient_Server_ReconnectComplete);
}
}
}
}
private void StandardClient_Server_ReconnectComplete(object sender, EventArgs e)
{
if (InvokeRequired)
{
BeginInvoke(new EventHandler(StandardClient_Server_ReconnectComplete), sender, e);
return;
}
try
{
// ignore callbacks from discarded objects.
if (!Object.ReferenceEquals(sender, m_reconnectHandler))
{
return;
}
m_session = m_reconnectHandler.Session;
m_reconnectHandler.Dispose();
m_reconnectHandler = null;
BrowseCTRL.SetView(m_session, BrowseViewType.Objects, null);
SessionsCTRL.Reload(m_session);
StandardClient_KeepAlive(m_session, null);
}
catch (Exception exception)
{
GuiUtils.HandleException(this.Text, MethodBase.GetCurrentMethod(), exception);
}
}
/// <summary>
/// Connects to a server.
/// </summary>
public void Connect(ConfiguredEndpoint endpoint)
{
if (endpoint == null)
{
return;
}
Session session = SessionsCTRL.Connect(endpoint);
if (session != null)
{
// stop any reconnect operation.
if (m_reconnectHandler != null)
{
m_reconnectHandler.Dispose();
m_reconnectHandler = null;
}
m_session = session;
m_session.KeepAlive += new KeepAliveEventHandler(StandardClient_KeepAlive);
BrowseCTRL.SetView(m_session, BrowseViewType.Objects, null);
StandardClient_KeepAlive(m_session, null);
}
}
/// <summary>
/// Disconnects from a server.
/// </summary>
public void Disconnect()
{
if (m_session != null)
{
// stop any reconnect operation.
if (m_reconnectHandler != null)
{
m_reconnectHandler.Dispose();
m_reconnectHandler = null;
}
m_session.Close();
m_session = null;
}
ServerUrlLB.Text = "";
}
/// <summary>
/// Handles a keep alive notification for a session by updating the status bar.
/// </summary>
private void Session_KeepAlive(Session session, KeepAliveEventArgs e)
{
if (this.InvokeRequired)
{
this.BeginInvoke(new KeepAliveEventHandler(Session_KeepAlive), session, e);
return;
}
try
{
// check for events from discarded sessions.
if (!Object.ReferenceEquals(session, m_session))
{
return;
}
if (ServiceResult.IsBad(e.Status))
{
if (m_reconnectHandler == null)
{
LastKeepAliveTimeLB.Text = e.Status.ToString();
LastKeepAliveTimeLB.ForeColor = Color.Red;
ConnectedLB.Text = "Reconnecting";
m_reconnectHandler = new SessionReconnectHandler();
m_reconnectHandler.BeginReconnect(m_session, 10000, Server_ReconnectComplete);
}
return;
}
LastKeepAliveTimeLB.Text = Utils.Format("{0:HH:mm:ss}", e.CurrentTime.ToLocalTime());
LastKeepAliveTimeLB.ForeColor = Color.Empty;
}
catch (Exception exception)
{
MessageBox.Show(exception.Message, this.Text, MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
/// <summary>
/// Cleans up when the main form closes.
/// </summary>
private void MainForm_FormClosing(object sender, FormClosingEventArgs e)
{
if (m_reconnectHandler != null)
{
m_reconnectHandler.Dispose();
m_reconnectHandler = null;
}
if (m_session != null)
{
m_session.Close(1000);
m_session = null;
}
}
/// <summary>
/// Disconnects from the current session.
/// </summary>
private void Server_ReconnectComplete(object sender, EventArgs e)
{
if (this.InvokeRequired)
{
this.BeginInvoke(new EventHandler(Server_ReconnectComplete), sender, e);
return;
}
try
{
// ignore callbacks from discarded objects.
if (!Object.ReferenceEquals(sender, m_reconnectHandler))
{
return;
}
m_session = m_reconnectHandler.Session;
m_reconnectHandler.Dispose();
m_reconnectHandler = null;
ConnectedLB.Text = "Connected";
LastKeepAliveTimeLB.Text = "---";
}
catch (Exception exception)
{
MessageBox.Show(exception.Message, this.Text, MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
/// <summary>
/// Handles a reconnect event complete from the reconnect handler.
/// </summary>
private void Server_ReconnectComplete(object sender, EventArgs e)
{
if (this.InvokeRequired)
{
this.BeginInvoke(new EventHandler(Server_ReconnectComplete), sender, e);
return;
}
try
{
// ignore callbacks from discarded objects.
if (!Object.ReferenceEquals(sender, m_reconnectHandler))
{
return;
}
m_session = m_reconnectHandler.Session;
m_reconnectHandler.Dispose();
m_reconnectHandler = null;
// raise any additional notifications.
if (m_ReconnectComplete != null)
{
m_ReconnectComplete(this, e);
}
}
catch (Exception exception)
{
ClientUtils.HandleException(this.Text, exception);
}
}
/// <summary>
/// Handles a keep alive event from a session.
/// </summary>
private void Session_KeepAlive(Session session, KeepAliveEventArgs e)
{
if (this.InvokeRequired)
{
this.BeginInvoke(new KeepAliveEventHandler(Session_KeepAlive), session, e);
return;
}
try
{
// check for events from discarded sessions.
if (!Object.ReferenceEquals(session, m_session))
{
return;
}
// start reconnect sequence on communication error.
if (ServiceResult.IsBad(e.Status))
{
if (m_reconnectPeriod <= 0)
{
UpdateStatus(true, e.CurrentTime, "Communication Error ({0})", e.Status);
return;
}
UpdateStatus(true, e.CurrentTime, "Reconnecting in {0}s", m_reconnectPeriod);
if (m_reconnectHandler == null)
{
if (m_ReconnectStarting != null)
{
m_ReconnectStarting(this, e);
}
m_reconnectHandler = new SessionReconnectHandler();
m_reconnectHandler.BeginReconnect(m_session, m_reconnectPeriod * 1000, Server_ReconnectComplete);
}
return;
}
// update status.
UpdateStatus(false, e.CurrentTime, "Connected [{0}]", session.Endpoint.EndpointUrl);
// raise any additional notifications.
if (m_KeepAliveComplete != null)
{
m_KeepAliveComplete(this, e);
}
}
catch (Exception exception)
{
ClientUtils.HandleException(this.Text, exception);
}
}
/// <summary>
/// Disconnects from the server.
/// </summary>
public void Disconnect()
{
UpdateStatus(false, DateTime.UtcNow, "Disconnected");
// stop any reconnect operation.
if (m_reconnectHandler != null)
{
m_reconnectHandler.Dispose();
m_reconnectHandler = null;
}
// disconnect any existing session.
if (m_session != null)
{
m_session.Close(10000);
m_session = null;
}
// raise an event.
DoConnectComplete(null);
}
private void BeginReconnect()
{
if (m_subscription != null)
{
foreach (MonitoredItem monitoredItem in m_subscription.MonitoredItems)
{
Opc.Ua.Server.MonitoredItem localItem = (Opc.Ua.Server.MonitoredItem)monitoredItem.Handle;
localItem.QueueValue(null, StatusCodes.BadDeviceFailure);
}
}
if (m_reconnectHandler == null)
{
m_reconnectHandler = new SessionReconnectHandler();
m_reconnectHandler.BeginReconnect(m_session, m_reconnectPeriod * 1000, Server_ReconnectComplete);
}
m_session = null;
m_subscription = null;
}
