void IMaslConnectionObserver.OnMaslUserDataArrival(byte[] maslUserData)
{
try
{
var frame = SaiFrame.Parse(maslUserData);
if (this.CheckFrame(frame))
{
_seqNoManager.UpdateAckSeq(frame.SequenceNo);
_currentState.HandleFrame(frame);
if (this.SaiFrameReceived != null)
{
this.SaiFrameReceived(null, new SaiFrameIncomingEventArgs(frame));
}
}
else if (_seqNoManager.IsBeyondRange(frame.SequenceNo))
{
throw new Exception(string.Format("检测到丢包，当前确认序号={0}，收到的发送序号={1}。",
_seqNoManager.AckSeq, frame.SequenceNo));
}
else
{
// 序号值为旧值，丢弃即可。
}
}
catch (System.Exception ex)
{
LogUtility.Error(string.Format("Sai: {0} \r\n{1}", _rsspEndPoint.ID, ex));
this.Disconnect(MaslErrorCode.NotDefined, 0);
}
}
void IAleTunnelObserver.OnAleFrameArrival(AleTunnel theConnection, AleFrame theFrame)
{
try
{
lock (_stateInputEventSyncLock)
{
if (CheckFrame(theFrame))
{
// D类服务时，序列号有效；A类服务时，序列号无效。
if (_rsspEndPoint.ServiceType == ServiceType.D &&
theFrame.FrameType == AleFrameType.DataTransmission)
{
_seqNoManager.UpdateAckSeq(theFrame.SequenceNo);
}
//
if (theFrame.FrameType == AleFrameType.ConnectionRequest)
{
LogUtility.Info(string.Format("{0}: Received a CR frame on tcp connection(LEP={1}, REP={2}).",
this.RsspEP.ID, theConnection.LocalEndPoint, theConnection.RemoteEndPoint));
theConnection.Observer = this;
_currentState.HandleConnectionRequestFrame(theConnection, theFrame);
}
else if (theFrame.FrameType == AleFrameType.ConnectionConfirm)
{
LogUtility.Info(string.Format("{0}: Received a CC frame on tcp connection(LEP={1}, REP={2})).",
this.RsspEP.ID, theConnection.LocalEndPoint, theConnection.RemoteEndPoint));
_currentState.HandleConnectionConfirmFrame(theConnection, theFrame);
}
else if (theFrame.FrameType == AleFrameType.Disconnect)
{
_currentState.HandleDiFrame(theConnection, theFrame);
}
else if (theFrame.FrameType == AleFrameType.DataTransmission)
{
_currentState.HandleDataTransmissionFrame(theConnection, theFrame);
}
}
else if (_seqNoManager.IsBeyondRange(theFrame.SequenceNo))
{
throw new Exception(string.Format("检测到丢包，当前确认序号={0}，收到的发送序号={1}，TCP ID = {2}",
_seqNoManager.AckSeq, theFrame.SequenceNo, theConnection.ID));
}
}
}
catch (System.Exception ex)
{
LogUtility.Error(string.Format("ALE: {0} : {1}", _rsspEndPoint.ID, ex));
theConnection.Disconnect();
}
}
public void Test_IsBeyondRange()
{
uint initialValue = 0;
uint maxValue = 255;
var mgr = new SeqNoManager(initialValue, maxValue, 6);
mgr.UpdateAckSeq(252);
var actual = mgr.IsBeyondRange(250);
Assert.AreEqual(false, actual);
actual = mgr.IsBeyondRange(251);
Assert.AreEqual(false, actual);
actual = mgr.IsBeyondRange(252);
Assert.AreEqual(false, actual);
actual = mgr.IsBeyondRange(253);
Assert.AreEqual(false, actual);
actual = mgr.IsBeyondRange(254);
Assert.AreEqual(false, actual);
actual = mgr.IsBeyondRange(255);
Assert.AreEqual(false, actual);
actual = mgr.IsBeyondRange(0);
Assert.AreEqual(false, actual);
actual = mgr.IsBeyondRange(1);
Assert.AreEqual(false, actual);
actual = mgr.IsBeyondRange(2);
Assert.AreEqual(false, actual);
actual = mgr.IsBeyondRange(3);
Assert.AreEqual(true, actual);
actual = mgr.IsBeyondRange(4);
Assert.AreEqual(true, actual);
actual = mgr.IsBeyondRange(5);
Assert.AreEqual(true, actual);
actual = mgr.IsBeyondRange(10);
Assert.AreEqual(true, actual);
}