// Connects to the AicServer and listens for messages
private void Listener_DoWork(object sender, DoWorkEventArgs e)
{
BackgroundWorker worker = (BackgroundWorker)sender;
while (!worker.CancellationPending)
{
#region Connect to server
while (!worker.CancellationPending && mTcpClient == null)
{
Connect();
var connectionStatusChangedEventArgs = new ConnectionStatusChangedEventArgs();
connectionStatusChangedEventArgs.ConnectedToServer = mTcpClient != null;
connectionStatusChangedEventArgs.CurrentReconnectCount = mCurrentReconnectCount;
worker.ReportProgress(0, connectionStatusChangedEventArgs);
if (mTcpClient == null)
{
Thread.Sleep(5000);
}
}
#endregion
#region Listen to server
while (!worker.CancellationPending && mTcpClient != null)
{
Thread.Sleep(200); // Prevent high cpu usage
// Check last connection and send a keepalive message if necessary
if (ConnectivityTimeoutExceeded)
{
var aicMessage = new AicMessage();
aicMessage.MessageType = MessageType.KeepAlive;
try
{
Send(aicMessage);
}
catch (Exception ex)
{
Log.GetInstance().LogError("Error in sending keepalive.", ex);
Disconnect();
break;
}
LastConnectivity = DateTime.Now;
}
// Get stream and check if it contains data
bool dataAvailable;
try
{
if (mTcpClient == null)
{
throw new Exception("mTcpClient is null.");
}
dataAvailable = mTcpClient.GetStream().DataAvailable;
}
catch (Exception ex)
{
Disconnect();
Log.GetInstance().LogError("Error in getting stream and checking if data is available.", ex);
break;
}
// Read stream data
if (dataAvailable)
{
Log.GetInstance().LogInformation("Received a message from AIC server.");
LastConnectivity = DateTime.Now;
AicMessage aicMessage = null;
try
{
// Deserialize stream
using (var ms = mTcpClient.ReadNetworkStream(AicMessage.XmlEndTagRegex))
{
ms.Position = 0;
aicMessage = AicMessage.Deserialize(ms);
}
}
catch (Exception ex)
{
bool connectionOk = CheckConnection();
if (!connectionOk)
{
Disconnect();
break;
}
Log.GetInstance().LogError("Error in deserializing network stream.", ex);
}
if (aicMessage != null)
{
// Only report AicMessage if it is a request or a response
if (aicMessage.MessageType == MessageType.Request || aicMessage.MessageType == MessageType.Response)
{
worker.ReportProgress(0, new MessageReceivedEventArgs(aicMessage));
}
#region Send response
if (aicMessage.MessageType == MessageType.Request || aicMessage.MessageType == MessageType.KeepAlive)
{
try
{
string msg = string.Empty;
var response = new AicMessage();
if (aicMessage.MessageType == MessageType.Request)
{
msg = "response";
response.Alarms = aicMessage.Alarms;
response.ConnectionWasToServerOk = aicMessage.ConnectionWasToServerOk;
response.MessageType = MessageType.Response;
}
else if (aicMessage.MessageType == MessageType.KeepAlive)
{
msg = "keepalive";
response.MessageType = MessageType.KeepAlive;
}
Send(response);
Log.GetInstance().LogInformation("Sent " + msg + " to AIC server.");
}
catch (Exception ex)
{
Log.GetInstance().LogError("Error in sending response/keepalive.", ex);
}
}
#endregion
}
}
}
#endregion
}
e.Cancel = worker.CancellationPending;
}
