/// <summary>
/// Reestablish connection to server.
/// </summary>
/// <remarks>
/// This method checks if the session is valid. If not, a new logon in perfomed automatically.
/// Handle the NewLogonNeeded event to provide credentials.
/// </remarks>
/// <returns>True, if reconnecting was successfull, otherwis false </returns>
internal bool InternalReconnect()
{
// When the session isn´t valid, the server process must have been restarted
if (!RemoteDispatcher.ExistSession(_sessionID))
{
AuthCredentials credentials = null;
var performNewLogon = true;
// If cached auto login credentials are present
if (_autoLoginOnExpiredSession)
{
credentials = _autoLoginCredentials;
}
else
{
var newLogonNeededEventArgs = new NewLogonNeededEventArgs();
if (OnNewLogonNeeded(newLogonNeededEventArgs))
{
performNewLogon = !newLogonNeededEventArgs.Cancel;
credentials = newLogonNeededEventArgs.Credentials;
}
else
{
performNewLogon = false;
}
}
if (performNewLogon)
{
if (credentials == null)
{
credentials = new AuthCredentials();
}
credentials.Authenticate(_sessionID, RemoteDispatcher);
ReconnectRemoteEvents();
RemoteDispatcher.ReceiveClientHeartbeat(_sessionID);
return(true);
}
}
else
{
RemoteDispatcher.ReceiveClientHeartbeat(_sessionID);
return(true);
}
return(false);
}
/// <summary>
/// Will be called from polling timer on every interval.
/// </summary>
/// <param name="state">State (not used)</param>
internal void SendHeartbeat(object state)
{
if (_sendingHeartbeat)
{
// if polling timer interval is less than
// channel timeout, skip sending a heartbeat
return;
}
try
{
_sendingHeartbeat = true;
try
{
PrepareCallContext(false);
RemoteDispatcher.ReceiveClientHeartbeat(_sessionID);
}
finally
{
_sendingHeartbeat = false;
}
}
catch (Exception ex)
{
PollingEnabled = false;
bool problemSolved = false;
DisconnectedEventArgs e = new DisconnectedEventArgs()
{
Exception = ex,
RetryCount = 0,
Retry = false
};
OnDisconnected(e);
while (e.Retry)
{
e.Retry = false;
Thread.Sleep(Convert.ToInt32(_pollingInterval.TotalMilliseconds));
try
{
problemSolved = InternalReconnect();
}
catch (Exception retryEx)
{
e.Exception = retryEx;
e.RetryCount++;
OnDisconnected(e);
}
}
if (problemSolved)
{
PollingEnabled = true;
OnReconnected(EventArgs.Empty);
}
else
{
// connection wasn't restored, make sure
// that the polling timer is stopped
PollingEnabled = false;
}
}
}
