private MessageService()
{
//try
//{
//load configuration
ParseConfig();
//check failed messages on start
FileInfo fi = new FileInfo(_filepath);
if (fi.Exists)
_hasFailures = true;
_activeHost = FindHost();
//set timer for periodic connectivity check
TimerCallback tcb = new TimerCallback(TimerElapsed);
Timer timer = new Timer(tcb, null, _checktime, _checktime);
//}
//catch
//{
//intentionally left blank to not have the Windows Unhandled Exception box
//}
}
private void ParseConfig()
{
//load configuration file
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load("configuration.xml");
//parse elements
XmlElement root = xmlDoc.DocumentElement;
foreach (XmlElement element in root.ChildNodes)
{
if (element.Name == "hosts")
{
foreach (XmlElement subElement in element.ChildNodes)
{
if (subElement.Name == "host")
{
if (subElement.ChildNodes.Count == 2)
{
XmlNode IP = subElement.ChildNodes[0];
XmlNode port = subElement.ChildNodes[1];
Host myHost = new Host(IP.InnerText, int.Parse(port.InnerText));
_hosts.Add(myHost);
}
}
}
}
if (element.Name == "backupFile")
{
_filepath = element.InnerText;
}
if (element.Name == "logPath")
{
_logpath = ((element.InnerText.EndsWith(@"\") ? element.InnerText.Substring(0, element.InnerText.Length - 1) : element.InnerText) + @"\" + DateTime.Today.ToString("yyyyMMdd") + ".log");
}
if (element.Name == "interval")
{
_checktime = long.Parse(element.InnerText);
}
}
//log application startup
string message = string.Format("{0}{1} - Application started{0}", Environment.NewLine, DateTime.Now.ToString("HH:mm:ss.ffffff"));
File.AppendAllText(_logpath, message, Encoding.UTF8);
}
//timer callback
private void TimerElapsed(object info)
{
_activeHost = FindHost();
}
void OnDoWork(object sender, DoWorkEventArgs e)
{
while (_messages.Count > 0)
{
TcpClient client = new TcpClient();
try
{
client.Connect(IPAddress.Parse(_activeHost.IP), _activeHost.Port);
string message = _messages.Dequeue();
byte[] buffer = Encoding.Unicode.GetBytes(message);
client.Client.Send(buffer);
Log(new MessageEventArgs(message, _messages.Count, MessageStatus.Success, null));
}
catch (SocketException ex)
{
_hasFailures = true;
string[] messages = _messages.ToArray();
Log(new MessageEventArgs(null, _messages.Count, MessageStatus.Failure, ex.Message));
_messages.Clear();
//save array to file
StringBuilder allMessages = new StringBuilder();
foreach (string message in messages)
{
allMessages.Append(message + Environment.NewLine);
}
File.AppendAllText(_filepath, allMessages.ToString(), Encoding.UTF8);
//failover
_activeHost = FindHost();
}
finally
{
if (client.Connected)
{
client.Client.Shutdown(SocketShutdown.Both);
client.Client.Disconnect(false);
}
}
}
_backgroundWorker = null;
}
