public static SaiFrame Parse(byte[] bytes)
{
SaiFrame theFrame = null;
var theFrameType = (SaiFrameType)bytes[0];
if (theFrameType == SaiFrameType.TTS_OffsetStart)
{
theFrame = new SaiTtsFrameOffsetStart();
}
else if (theFrameType == SaiFrameType.TTS_OffsetAnswer1)
{
theFrame = new SaiTtsFrameOffsetAnswer1();
}
else if (theFrameType == SaiFrameType.TTS_OffsetAnswer2)
{
theFrame = new SaiTtsFrameOffsetAnswer2();
}
else if (theFrameType == SaiFrameType.TTS_OffsetEstimate)
{
theFrame = new SaiTtsFrameEstimate();
}
else if (theFrameType == SaiFrameType.TTS_OffsetEnd)
{
theFrame = new SaiTtsFrameOffsetEnd();
}
else if (theFrameType == SaiFrameType.TTS_AppData)
{
theFrame = new SaiTtsFrameAppData();
}
else if (theFrameType == SaiFrameType.EC_Start)
{
theFrame = new SaiEcFrameStart();
}
else if (theFrameType == SaiFrameType.EC_AppData)
{
theFrame = new SaiEcFrameApplication();
}
else if (theFrameType == SaiFrameType.EC_AppDataAskForAck)
{
theFrame = new SaiEcFrameAskForAck();
}
else if (theFrameType == SaiFrameType.EC_AppDataAcknowlegment)
{
theFrame = new SaiEcFrameAcknowlegment();
}
else
{
throw new InvalidOperationException(string.Format("无法解析指定的Sai帧，不可识别的类型{0}。", theFrameType));
}
theFrame.ParseBytes(bytes);
return(theFrame);
}
public void Test1()
{
var frame1 = new SaiEcFrameAskForAck();
frame1.SequenceNo = 200;
frame1.EcValue = 100;
frame1.UserData = new byte[] { 1 };
var bytes = frame1.GetBytes();
var frame2 = SaiFrame.Parse(bytes) as SaiEcFrameAskForAck;
Assert.AreEqual(SaiFrameType.EC_AppDataAskForAck, frame2.FrameType);
Assert.AreEqual(frame2.SequenceNo, frame1.SequenceNo);
Assert.AreEqual(frame2.EcValue, frame1.EcValue);
Assert.AreEqual(frame2.UserData[0], frame1.UserData[0]);
}
protected override void HandleEcAskForAckFrame(SaiEcFrameAskForAck askForAckFrame)
{
// 提取用户数据并通知观察器。
if (askForAckFrame.UserData != null)
{
var timeDelay = this.DefenseStrategy.CalcTimeDelay(askForAckFrame);
var remoteID = this.Context.RsspEP.RemoteID;
this.Context.Observer.OnSaiUserDataArrival(remoteID, askForAckFrame.UserData, timeDelay, MessageDelayDefenseTech.EC);
}
// 回复Acknowlegment。
var ecValue = this.DefenseStrategy.GetLocalEcValue();
var seqNo = (ushort)this.Context.SeqNoManager.GetAndUpdateSendSeq();
var frame = new SaiEcFrameAcknowlegment(seqNo, ecValue, null);
var bytes = frame.GetBytes();
this.Context.NextLayer.SendUserData(bytes);
}
protected virtual void HandleEcAskForAckFrame(SaiEcFrameAskForAck frame)
{
LogUtility.Error(string.Format("{0}: {1}.{2} not implement!",
this.Context.RsspEP.ID, this.GetType().Name,
new StackFrame(0).GetMethod().Name.Split('.').Last()));
}
