/// <summary>
/// Enqueue the send to occur when network bandwidth is available.
/// </summary>
/// <param name="buffer"></param>
/// <param name="length"></param>
/// <param name="socket"></param>
/// <param name="participant"></param>
internal void Send(byte[] buffer, int length, ClientData client, MessageTags tags,
ulong messageSequence, ulong chunkSequence, bool isHeartbeat)
{
using (Synchronizer.Lock(m_SocketMap)) {
Debug.Assert(m_SocketMap.ContainsKey(client.Id), "TCPServerSender.Send found a missing Socket Map entry.");
}
//Trace.WriteLine("TCPServerSender.Send seq=" + messageSequence.ToString());
//Enqueue the message
using (Synchronizer.Cookie cookie = Synchronizer.Lock(m_SendQueue)) {
m_SendQueue.Enqueue(new SendParameters(buffer, length, client.Id, tags, messageSequence, chunkSequence, isHeartbeat),
client.Participant);
// Notify the sender thread that the queue's status has changed.
cookie.PulseAll();
}
}
/// <summary>
/// If a client reconnects, update the socket map and enable the client's queue
/// </summary>
/// <param name="id"></param>
/// <param name="s"></param>
internal void Reconnect(ClientData client, ulong lastMessage, ulong lastChunk)
{
using (Synchronizer.Lock(this.m_SocketMap)) {
if (m_SocketMap.ContainsKey(client.Id)) {
m_SocketMap[client.Id] = client.Socket;
}
}
using (Synchronizer.Cookie cookie = Synchronizer.Lock(this.m_SendQueue)) {
m_SendQueue.EnableClient(client, lastMessage, lastChunk);
cookie.PulseAll();
}
}
internal void AddClient(ClientData client)
{
using (Synchronizer.Lock(m_SocketMap)) {
Debug.Assert(!m_SocketMap.ContainsKey(client.Id), "TCPServerSender.AddClient: Attempt to add a duplicate Socket Map entry.");
m_SocketMap.Add(client.Id, client.Socket);
}
}
/// <summary>
/// Enable dequeue for a client's queue
/// </summary>
/// <param name="client"></param>
public void EnableClient(ClientData client, ulong lastMessage, ulong lastChunk)
{
Trace.WriteLine("TCPServerSendQueue Enable client id=" + client.Id.ToString(), this.GetType().ToString());
lock (this) {
if (m_DisabledClients.ContainsKey(client.Id)) {
m_DisabledClients.Remove(client.Id);
}
if (m_QueueList.ContainsKey(client.Id)) {
((ClientQueue)m_QueueList[client.Id]).RecoverMessages(lastMessage, lastChunk);
((ClientQueue)m_QueueList[client.Id]).UpdateParticipant(client.Participant);
}
}
}
/// <summary>
/// When the ListenThread has a prospective new client on the line, here we attempt to establish the connection.
/// </summary>
/// <param name="ar"></param>
private void AcceptSocketCallback(IAsyncResult ar)
{
Socket s = null;
TcpListener tcpListener = (TcpListener)ar.AsyncState;
try {
s = tcpListener.EndAcceptSocket(ar);
}
catch (ObjectDisposedException ode) {
Trace.WriteLine("AcceptSocketCallback ObjectDisposedException" + ode.Message, this.GetType().ToString());
return;
}
catch (SocketException se) {
Trace.WriteLine("AcceptSocketCallback: " + se.ToString(), this.GetType().ToString());
return;
}
catch (Exception e) {
Trace.WriteLine(e.ToString(), this.GetType().ToString());
return;
}
finally {
m_ClientConnected.Set(); //Let the ListenThread continue
}
if (s != null) {
try {
//Send a handshake
NetworkStream ns = new NetworkStream(s); //Here the network stream does not "own" the socket, so we have to close it explicitly.
BinaryFormatter bf = new BinaryFormatter();
MemoryStream ms = new MemoryStream();
TCPHandshakeMessage handshake = new TCPHandshakeMessage(this.m_Participant, new IPEndPoint(0, 0));
bf.Serialize(ms, handshake);
ns.Write(ms.GetBuffer(), 0, (int)ms.Length);
Trace.WriteLine("Handshake sent.", this.GetType().ToString());
//Receive a handshake
object o = bf.Deserialize(ns);
if (o is TCPHandshakeMessage) {
TCPHandshakeMessage h = (TCPHandshakeMessage)o;
Trace.WriteLine("Handshake received from " + h.ParticipantId.ToString() + " ep=" + h.EndPoint.ToString(), this.GetType().ToString());
ParticipantModel p;
//In case this client still has a socket open, force it to close
ClosePreviousSocket(h.ParticipantId);
//Notice that as soon as we add the entry to m_AllClients, it is eligible for sending of outbound messages:
bool newClient = false;
lock (m_AllClients) {
if (m_AllClients.ContainsKey(h.ParticipantId)) {
((ClientData)m_AllClients[h.ParticipantId]).ConnectionState = ConnectionState.Connected;
((ClientData)m_AllClients[h.ParticipantId]).Socket = s;
p = ((ClientData)m_AllClients[h.ParticipantId]).Participant;
//Add the participant to the classroom model
using (Synchronizer.Lock(m_Classroom.SyncRoot)) {
m_Classroom.Participants.Add(p);
}
((ClientData)m_AllClients[h.ParticipantId]).Timeout = DateTime.MaxValue;
this.m_ServerSender.Reconnect(((ClientData)m_AllClients[h.ParticipantId]), h.LastMessageSequence, h.LastChunkSequence);
}
else {
p = new ParticipantModel(h.ParticipantId,h.HumanName);
//Add the participant to the classroom model
using (Synchronizer.Lock(m_Classroom.SyncRoot)) {
m_Classroom.Participants.Add(p);
}
ClientData client = new ClientData(s,h.ParticipantId,p);
this.m_ServerSender.AddClient(client);
m_AllClients.Add(h.ParticipantId, client);
newClient = true;
}
}
//Update connected client count for network status
using (Synchronizer.Lock(this.SyncRoot)) {
this.SetPublishedProperty("ClientCount", ref this.m_ClientCount, this.m_ClientCount+1);
NetworkStatus newStatus = m_NetworkStatus.Clone();
newStatus.ClientCount = this.m_ClientCount;
this.SetPublishedProperty("NetworkStatus", ref m_NetworkStatus, newStatus);
}
//Start a receive thread for this socket.
Thread receiveThread = new Thread(ReceiveThread);
receiveThread.Start(new ReceiveThreadArgs(p, ns, s.RemoteEndPoint));
//Send the current presentation state if this is a new client
if (newClient) {
m_Sender.ForceUpdate(new SingletonGroup(p));
}
}
else {
Trace.WriteLine("AcceptSocketCallback invalid handshake from " + s.RemoteEndPoint.ToString(), this.GetType().ToString());
}
}
catch (Exception e) {
Trace.WriteLine("AcceptSocketCallback exception while handshaking with " + s.RemoteEndPoint.ToString() + ": " + e.ToString(), this.GetType().ToString());
}
}
}
/// <summary>
/// When the ListenThread has a prospective new client on the line, here we attempt to establish the connection.
/// </summary>
/// <param name="ar"></param>
private void AcceptSocketCallback(IAsyncResult ar)
{
Socket s = null;
TcpListener tcpListener = (TcpListener)ar.AsyncState;
try {
s = tcpListener.EndAcceptSocket(ar);
}
catch (ObjectDisposedException ode) {
Trace.WriteLine("AcceptSocketCallback ObjectDisposedException" + ode.Message, this.GetType().ToString());
return;
}
catch (SocketException se) {
Trace.WriteLine("AcceptSocketCallback: " + se.ToString(), this.GetType().ToString());
return;
}
catch (Exception e) {
Trace.WriteLine(e.ToString(), this.GetType().ToString());
return;
}
finally {
m_ClientConnected.Set(); //Let the ListenThread continue
}
if (s != null)
{
try {
//Send a handshake
NetworkStream ns = new NetworkStream(s); //Here the network stream does not "own" the socket, so we have to close it explicitly.
BinaryFormatter bf = new BinaryFormatter();
MemoryStream ms = new MemoryStream();
TCPHandshakeMessage handshake = new TCPHandshakeMessage(this.m_Participant, new IPEndPoint(0, 0));
#if GENERIC_SERIALIZATION
handshake.Serialize().WriteToStream(ms);
#else
bf.Serialize(ms, handshake);
#endif
ns.Write(ms.GetBuffer(), 0, (int)ms.Length);
Trace.WriteLine("Handshake sent.", this.GetType().ToString());
//Receive a handshake
#if GENERIC_SERIALIZATION
IGenericSerializable o = PacketTypes.DecodeMessage(null, new SerializedPacket(ns));
#else
object o = bf.Deserialize(ns);
#endif
if (o is TCPHandshakeMessage)
{
TCPHandshakeMessage h = (TCPHandshakeMessage)o;
Trace.WriteLine("Handshake received from " + h.ParticipantId.ToString() + " ep=" + h.EndPoint.ToString(), this.GetType().ToString());
ParticipantModel p;
//In case this client still has a socket open, force it to close
ClosePreviousSocket(h.ParticipantId);
//Notice that as soon as we add the entry to m_AllClients, it is eligible for sending of outbound messages:
bool newClient = false;
lock (m_AllClients) {
if (m_AllClients.ContainsKey(h.ParticipantId))
{
((ClientData)m_AllClients[h.ParticipantId]).ConnectionState = ConnectionState.Connected;
((ClientData)m_AllClients[h.ParticipantId]).Socket = s;
p = ((ClientData)m_AllClients[h.ParticipantId]).Participant;
//Add the participant to the classroom model
using (Synchronizer.Lock(m_Classroom.SyncRoot)) {
m_Classroom.Participants.Add(p);
}
((ClientData)m_AllClients[h.ParticipantId]).Timeout = DateTime.MaxValue;
this.m_ServerSender.Reconnect(((ClientData)m_AllClients[h.ParticipantId]), h.LastMessageSequence, h.LastChunkSequence);
}
else
{
p = new ParticipantModel(h.ParticipantId, h.HumanName);
//Add the participant to the classroom model
using (Synchronizer.Lock(m_Classroom.SyncRoot)) {
m_Classroom.Participants.Add(p);
}
ClientData client = new ClientData(s, h.ParticipantId, p);
this.m_ServerSender.AddClient(client);
m_AllClients.Add(h.ParticipantId, client);
newClient = true;
}
}
//Update connected client count for network status
using (Synchronizer.Lock(this.SyncRoot)) {
this.SetPublishedProperty("ClientCount", ref this.m_ClientCount, this.m_ClientCount + 1);
NetworkStatus newStatus = m_NetworkStatus.Clone();
newStatus.ClientCount = this.m_ClientCount;
this.SetPublishedProperty("NetworkStatus", ref m_NetworkStatus, newStatus);
}
//Start a receive thread for this socket.
Thread receiveThread = new Thread(ReceiveThread);
receiveThread.Start(new ReceiveThreadArgs(p, ns, s.RemoteEndPoint));
//Send the current presentation state if this is a new client
if (newClient)
{
m_Sender.ForceUpdate(new SingletonGroup(p));
}
}
else
{
Trace.WriteLine("AcceptSocketCallback invalid handshake from " + s.RemoteEndPoint.ToString(), this.GetType().ToString());
}
}
catch (Exception e) {
Trace.WriteLine("AcceptSocketCallback exception while handshaking with " + s.RemoteEndPoint.ToString() + ": " + e.ToString(), this.GetType().ToString());
}
}
}
