/**
*
* @Title: shutdown
* @Description: 关闭连接
* @param @throws IOException 参数
* @return void 返回类型
*/
public void shutdownNow()
{
//如果客户端已经就绪并且激活（数据交互）
if (clientSession.IsReady && clientSession.IsActive == true)
{
//发送多次关闭信息
Shutdown shutdown = new Shutdown();
shutdown.DestinationID = clientSession.Destination.SocketID;
shutdown.SetSession(clientSession);
try
{
clientEndpoint.DoSend(shutdown);
// TimeUnit.MILLISECONDS.sleep(100);
}
catch (Exception e)
{
//logger.log(Level.SEVERE, "ERROR: Connection could not be stopped!", e);
}
clientSession.Socket.GetReceiver().Stop();
clientEndpoint.Stop();
//cd 添加 客户端一旦关闭就无效了，可以不移除，该对象关闭则不能使用了
clientEndpoint.RemoveSession(clientSession.SocketID);
//关闭发送
clientSession.Socket.GetSender().Stop();
closed = true;
}
clientEndpoint.Stop();
}
/**
* handle the connection handshake:<br/>
* <ul>
* <li>set initial sequence number</li>
* <li>send response handshake</li>
* </ul>
* @param handshake
* @param peer
* @throws IOException
*/
protected void HandleHandShake(ConnectionHandshake handshake)
{
ConnectionHandshake responseHandshake = new ConnectionHandshake();
//compare the packet size and choose minimun
long clientBufferSize = handshake.PacketSize;
long myBufferSize = datagramSize;
long bufferSize = Math.Min(clientBufferSize, myBufferSize);
long initialSequenceNumber = handshake.InitialSeqNo;
this.initialSequenceNumber = initialSequenceNumber;
this.DatagramSize = (int)bufferSize;
// setDatagramSize((int) bufferSize);
responseHandshake.PacketSize = bufferSize;
responseHandshake.UdtVersion = 4;
responseHandshake.InitialSeqNo = initialSequenceNumber;
responseHandshake.ConnectionType = -1;
responseHandshake.MaxFlowWndSize = handshake.MaxFlowWndSize;
//tell peer what the socket ID on this side is
responseHandshake.SocketID = mySocketID;
responseHandshake.DestinationID = this.destination.SocketID;
//cd 2018-08-28
if (this.cookie == 0)
{
this.cookie = CreateCookie();
}
responseHandshake.Cookie = cookie;
responseHandshake.SetSession(this);
FlashLogger.Info("Sending reply " + responseHandshake);
endPoint.DoSend(responseHandshake);
}
//handshake for connect
protected void SendHandShake()
{
ConnectionHandshake handshake = new ConnectionHandshake();
handshake.ConnectionType = ConnectionHandshake.CONNECTION_TYPE_REGULAR;
handshake.SocketType = ConnectionHandshake.SOCKET_TYPE_DGRAM;
long initialSequenceNo = SequenceNumber.Random();
initialSequenceNumber = initialSequenceNo;
handshake.InitialSeqNo = initialSequenceNo;
handshake.PacketSize = datagramSize;
handshake.SocketID = mySocketID;
handshake.MaxFlowWndSize = flowWindowSize;
//cd 2018-08-28
handshake.SetPeerIP(this.endPoint.GetLocalAddress().Address.ToString());
handshake.SetSession(this);
FlashLogger.Info("Sending " + handshake);
endPoint.DoSend(handshake);
connectNum++;
}
/**
* sends the given data packet, storing the relevant information
*
* @param data
* @throws IOException
* @throws InterruptedException
*/
private void Send(DataPacket p)
{
lock (sendLock){
if (storeStatistics)
{
dgSendInterval.End();
dgSendTime.Begin();
}
endpoint.DoSend(p);
if (storeStatistics)
{
dgSendTime.End();
dgSendInterval.Begin();
throughput.End();
throughput.Begin();
}
sendBuffer[p.GetPacketSequenceNumber()] = p;
Interlocked.Increment(ref unacknowledged);
}
statistics.incNumberOfSentDataPackets();
}
/**
* write a NAK triggered by a received sequence number that is larger than
* the largestReceivedSeqNumber + 1
* @param currentSequenceNumber - the currently received sequence number
* @throws IOException
*/
protected void SendNAK(long currentSequenceNumber)
{
NegativeAcknowledgement nAckPacket = new NegativeAcknowledgement();
nAckPacket.AddLossInfo(largestReceivedSeqNumber + 1, currentSequenceNumber);
nAckPacket.SetSession(session);
nAckPacket.DestinationID = session.Destination.SocketID;
//put all the sequence numbers between (but excluding) these two values into the
//receiver loss list
for (long i = largestReceivedSeqNumber + 1; i < currentSequenceNumber; i++)
{
ReceiverLossListEntry detectedLossSeqNumber = new ReceiverLossListEntry(i);
receiverLossList.Insert(detectedLossSeqNumber);
}
endpoint.DoSend(nAckPacket);
//logger.info("NAK for "+currentSequenceNumber);
statistics.incNumberOfNAKSent();
}
