// If the first attempt to start the WCF service fails due to AddressAlreadyInUseException
// and retrying is enabled, this will get called every AppArgs.RetryInterval minutes to retry
// as long it continues to fail due to AddressAlreadyInUseException.
public static void RetryWcfService(object sender, System.Timers.ElapsedEventArgs e)
{
// This is called via _wcfRetryTimer on a ThreadPool thread. Temporarily change the thread name for logging purposes.
using (Log.ThreadNameForCall("TracerX Starter"))
{
lock (_lock)
{
if (_wcfRetryTimer != null && _wcfRetryTimer.Enabled)
{
try
{
Log.Debug("Attempting to start TracerX WCF services.");
TracerXServices.Startup(AppArgs.Port, AppArgs.IsImpersonate);
// Getting here means Startup() succeeded (no exception) so we can stop/dispose/release the timer.
if (AppArgs.IsConsoleApp)
{
Console.WriteLine("The TracerX WCF service was started.");
}
Log.Info("TracerX WCF service was started.");
_wcfRetryTimer.Dispose();
_wcfRetryTimer = null;
}
catch (System.ServiceModel.AddressAlreadyInUseException ex)
{
Log.Info("The TracerX WCF service port is still in use by another process.");
// Schedule another retry. Timer does not AutoReset so we have to start
// it explicitly.
_wcfRetryTimer.Interval = 60000.0 * AppArgs.RetryInterval;
_wcfRetryTimer.Start();
}
catch (Exception ex)
{
// This is unexpected and probably means we'll never be able to
// start the TracerX service host so just give up and stop the program.
Log.Fatal("Unexpected exception trying to start TracerX WCF service host: ", ex);
Stop();
}
}
}
}
}
// Whether we're a console app or a Windows service this is called to start the WCF service hosts.
// May also start the retry and/or self-update timers.
internal static void Start()
{
using (Log.InfoCall())
{
lock (_lock)
{
MaybeStartSelfUpdateTimer();
if (AppArgs.RetryInterval <= 0)
{
// Retries are disabled. If this throws an exception, e.g. if the port is in use by another process, we're done.
TracerXServices.Startup(AppArgs.Port, AppArgs.IsImpersonate);
}
else
{
// If the port is currently in use by another process start a timer to
// retry acquiring the port every AppArgs.RetryInterval minutes.
try
{
TracerXServices.Startup(AppArgs.Port, AppArgs.IsImpersonate);
}
catch (System.ServiceModel.AddressAlreadyInUseException)
{
if (AppArgs.IsConsoleApp)
{
Console.WriteLine("Starting the retry timer because the port ({0}) used by the", AppArgs.Port);
Console.WriteLine("TracerX WCF service is currently in use by another process.");
Console.WriteLine("The retry interval is {0} minutes.", AppArgs.RetryInterval);
}
Log.Warn("Starting the retry timer because the port used by the TracerX WCF service is currently in use by another process. Port = " + AppArgs.Port);
_wcfRetryTimer = new System.Timers.Timer(60000.0 * AppArgs.RetryInterval);
_wcfRetryTimer.AutoReset = false;
_wcfRetryTimer.Elapsed += RetryWcfService;
_wcfRetryTimer.Start();
}
}
}
}
}
private void btnStart_Click(object sender, EventArgs e)
{
int port = 25120;
if (radSpecifiedPort.Checked)
{
if (int.TryParse(txtPort.Text, out port))
{
if (port < 0 || port > 65535)
{
MainForm.ShowMessageBox("The port must be in the range 0 - 65535.");
port = -1;
}
}
else
{
MainForm.ShowMessageBox("The port must be a number in the range 0 - 65535.");
port = -1;
}
}
if (port != -1)
{
try
{
TracerXServices.Startup(port, radDoImpersonate.Checked);
DialogResult = DialogResult.OK;
}
catch (System.ServiceModel.AddressAlreadyInUseException)
{
// Another process is using the port. Check if it's the TracerX WCF service.
TryConnecting(port);
}
catch (Exception ex)
{
MainForm.ShowMessageBox("Could not start the TracerX service due to error: " + ex.Message);
}
}
}
