private static void HandshakeMessageReceived(string message)
{
//if (!_handshaking) return;
ServiceSyncMasterSlaveHandshakeMessage m = null;
try
{
m = Deserialize <ServiceSyncMasterSlaveHandshakeMessage>(message);
}
catch (Exception e)
{
WriteTrace(string.Format("Exception: {0}{2} Trace: {1}", e.Message, e.StackTrace, Environment.NewLine));
}
if (m == null)
{
return;
}
if (m.ServiceName != ServiceName)
{
return;
}
if (m.ServiceName == ServiceName && m.MachineName != MachineName)
{
lock (_handshakeLock)
{
m.ReceivedAt = DateTime.Now;
_lastReceivedHandshakeMessage = m;
}
}
}
public static void Start()
{
if (_running)
{
return;
}
_lastReceivedHandshakeMessage = null;
_lastReceivedSyncMessage = null;
IsMaster = false;
_handshaking = false;
_handshakeRetryCount = 0;
_failoverIntervalCounter = 0;
_running = true;
//var task = new Task(() => _receiver.Start());
//task.Start();
_receiver.Start();
_syncTimer.Start();
}
private static void Handshake()
{
if (_handshaking)
{
return;
}
try
{
_abortHandshake = false;
lock (_handshakeLock)
{
_lastReceivedHandshakeMessage = null;
}
_handshaking = true;
var diffMiliseconds = HeartBeatInverval * MaxHandshakeRetry * 10;
_luck = 0;
_handshakeRetryCount = 0;
WriteTrace("Handshake started...");
WishLuck();
Thread.Sleep(HeartBeatInverval * 5);
while (!_abortHandshake)
{
WriteTrace(string.Format("Handshake retry: {0}", _handshakeRetryCount));
var message = new ServiceSyncMasterSlaveHandshakeMessage()
{
Luck = _luck,
MachineName = MachineName,
ServiceName = ServiceName,
SentOn = DateTime.Now
};
var msg = Serialize(message);
_sender.SendMessage(msg);
Thread.Sleep(HeartBeatInverval * 5);
if (_lastReceivedHandshakeMessage != null && _lastReceivedHandshakeMessage.SentOn > DateTime.Now.AddMilliseconds(-diffMiliseconds))
{
if (_lastReceivedHandshakeMessage.Luck == _luck)
{
WriteTrace(string.Format("CAN NOT Decide we are EQUAL (Received: {0} == Sended: {1})", _lastReceivedHandshakeMessage.Luck, _luck));
WishLuck();
continue;
}
if (_lastReceivedHandshakeMessage.Luck < _luck)
{
WriteTrace(string.Format("Decided as MASTER by Luck (Received: {0} < Sended: {1})", _lastReceivedHandshakeMessage.Luck, _luck));
IsMaster = true;
break;
}
if (_lastReceivedHandshakeMessage.Luck > _luck)
{
WriteTrace(string.Format("Decided as SLAVE by Luck (Received: {0} > Sended: {1})", _lastReceivedHandshakeMessage.Luck, _luck));
IsMaster = false;
break;
}
}
if (_handshakeRetryCount > _maxHandshakeRetry)
{
WriteTrace("Decided as MASTER by RETRY");
IsMaster = true;
break;
}
_handshakeRetryCount++;
}
}
finally
{
_handshaking = false;
}
WriteTrace("Handshake ended...");
}