protected override bool UpdateTarget( ReceiveContext context )
{
using( Synchronizer.Lock( context.Model.SyncRoot ) ) {
using( Synchronizer.Lock( context.Model.ViewerState.Diagnostic.SyncRoot ) )
context.Model.ViewerState.Diagnostic.ExecuteLocalScript = !context.Model.ViewerState.Diagnostic.ExecuteLocalScript;
}
return false;
}
public CXPCapabilityMessageReceiver(CXPCapabilityMessageSender sender, uint ssrc, PresenterModel model, ClassroomModel classroom, ParticipantModel participant)
{
this.m_Model = model;
this.m_Sender = sender;
this.m_RemoteSSRC = ssrc;
this.m_Context = new ReceiveContext(model, classroom, participant);
this.m_ContextArgs = new object[] { this.m_Context };
this.m_Queue = new MessageProcessingQueue(this);
this.m_Assembler = new ChunkAssembler();
this.m_Assembler.Nack += new ChunkAssembler.NackDelegate(this.HandleAssemblerNack);
}
protected override bool UpdateTarget(ReceiveContext context)
{
// For the purposes of removal, whether the group is a Group or a SingletonGroup
// doesn't matter; all that matters is the Guid.
Group group = new Group(this.GroupId, this.FriendlyName);
using (Synchronizer.Lock(context.Participant.SyncRoot)) {
if (context.Participant.Groups.Contains(group))
context.Participant.Groups.Remove(group);
}
return false;
}
protected override bool UpdateTarget( ReceiveContext context )
{
using( Synchronizer.Lock( context.Model.SyncRoot ) ) {
// Check if this message is meant for this client
using( Synchronizer.Lock( context.Model.Participant.SyncRoot ) )
if( context.Model.Participant.Role is InstructorModel ||
context.Model.Participant.Role.Id != this.participantId )
return false;
// Set Client Model Sync State
using( Synchronizer.Lock( context.Model.ViewerState.Diagnostic.SyncRoot ) )
context.Model.ViewerState.Diagnostic.ClientState = DiagnosticModel.ClientSyncState.PINGING;
}
return false;
}
public RTPMessageReceiver(RTPMessageSender sender, RtpStream stream, PresenterModel model, ClassroomModel classroom, ParticipantModel participant)
{
this.m_Model = model;
this.m_Sender = sender;
this.m_RtpStream = stream;
this.m_Context = new ReceiveContext(model, classroom, participant);
this.m_ContextArgs = new object[] { this.m_Context };
this.m_Queue = new MessageProcessingQueue(this);
this.m_Serializer = new BinaryFormatter();
this.m_Assembler = new ChunkAssembler();
this.m_Assembler.Nack += new ChunkAssembler.NackDelegate(this.HandleAssemblerNack);
this.m_RtpStream.FrameReceived += new RtpStream.FrameReceivedEventHandler(this.HandleFrameReceived);
}
protected override bool UpdateTarget(ReceiveContext context)
{
// Discard bogus SingletonGroups. A participant cannot
// belong to a SingletonGroup that does not match his Guid.
if (this.Singleton && this.GroupId != context.Participant.Guid)
return false;
Group group = this.Singleton
? new SingletonGroup(context.Participant)
: new Group(this.GroupId, this.FriendlyName);
using (Synchronizer.Lock(context.Participant.SyncRoot)) {
if (!context.Participant.Groups.Contains(group)) {
context.Participant.Groups.Add(group);
}
}
return false;
}
protected override bool UpdateTarget(ReceiveContext context)
{
using (Synchronizer.Lock(context.Model.SyncRoot)) {
// Ensure that this message is only handled by the correct student
using (Synchronizer.Lock(context.Model.Participant.SyncRoot))
if (context.Model.Participant.Role is InstructorModel ||
context.Model.Participant.Role.Id != this.participantId)
return false;
// Set the Client Model Sync State and update the latency
using (Synchronizer.Lock(context.Model.ViewerState.Diagnostic.SyncRoot)) {
context.Model.ViewerState.Diagnostic.AddLatencyEntry(UW.ClassroomPresenter.Misc.AccurateTiming.Now);
context.Model.ViewerState.Diagnostic.ClientState = DiagnosticModel.ClientSyncState.START;
}
}
return false;
}
protected override bool UpdateTarget( ReceiveContext context )
{
using( Synchronizer.Lock( context.Model.SyncRoot ) ) {
// Ensure that this message is only handled by the instructor
using( Synchronizer.Lock( context.Model.Participant.SyncRoot ) )
if( !(context.Model.Participant.Role is InstructorModel) )
return false;
// Set Server Model Sync State
using( Synchronizer.Lock( context.Model.ViewerState.Diagnostic.SyncRoot ) )
context.Model.ViewerState.Diagnostic.ServerState = DiagnosticModel.ServerSyncState.PONGING;
}
return false;
}
/// <summary>
/// Enqueues a message for later execution on the message thread.
/// If the message thread is busy, and other messages are already
/// enqueued, the messages are combined (<see cref="Message.ZipInto"/>),
/// which may help to avoid duplicating work in some situations.
/// For example, multiple "Ink Erase" messages received in a row
/// can be combined into a single message, which saves the UI work
/// by only repainting itself once.
/// </summary>
/// <remarks>
/// (In fact, there is no "queue" -- meaning a list of messages -- but
/// rather the "zipped" messages provide all the functionality we need.)
///
/// FIXME: If we zip messages from different remote nodes, we
/// call OnReceive for all of them with the context of the last.
///
/// </remarks>
/// <param name="message">The message to execute</param>
public void ProcessMessage(Message message,ReceiveContext context)
{
using (Synchronizer.Lock(this)) {
if (this.m_Waiting == null) {
this.m_Waiting = message;
this.Post(delegate() {
Message waited;
using (Synchronizer.Lock(this)) {
if (this.m_Waiting != null) {
waited = this.m_Waiting;
this.m_Waiting = null;
}
else {
return;
}
}
waited.OnReceive(context);
});
}
else {
message.ZipInto(ref this.m_Waiting);
}
}
}
/// <summary>
/// Processes a message received over the TCP network interface.
/// </summary>
private void ReceiveThread()
{
while (true) {
try {
if (this.m_Disposed)
return;
object message = null;
ReceiveMessageAndParticipant rm;
rm = (ReceiveMessageAndParticipant)this.m_Receiver.Read(); //does not block.
if (rm == null) { //probably because of empty receive queue
Thread.Sleep(50);
continue;
}
message = rm.Message;
ReceiveContext context = new ReceiveContext(m_Model,m_Classroom,rm.Participant);
// If the message is a chunked, process it with the Chunk Assembler.
// (Messages don't have to be chunked, in which case they are processed
// immediately below). If the chunk is the last remaining chunk composing
// a message, then the Assembler returns the completed message.
if (message is Chunk) {
Chunk chunk = message as Chunk;
try {
Debug.WriteLine(string.Format("Received message #{0}, chunk #{1} of {2}, {3} bytes.",
chunk.MessageSequence,
chunk.ChunkSequenceInMessage + 1,
chunk.NumberOfChunksInMessage,
chunk.Data.Length),
this.GetType().ToString());
message = this.m_Assembler.Add((Chunk)message);
}
catch (Exception e) {
Trace.WriteLine(string.Format("Error deserializing a message from message #{0}, chunk #{1} of {2} ({3} bytes): {4}",
chunk.MessageSequence,
chunk.ChunkSequenceInMessage + 1,
chunk.NumberOfChunksInMessage,
chunk.Data.Length, e.ToString()),
this.GetType().ToString());
continue;
}
}
// If we have a valid/complete message, queue it for processing on the separate
// message execution thread.
if (message is IEnumerable<object>) {
foreach (object decoded in (IEnumerable<object>)message) {
if (decoded is Message) {
Message m = (Message)decoded;
this.m_Model.ViewerState.Diagnostic.LogMessageRecv(m);
//Debug.WriteLine(string.Format("Received message: {0} bytes, type {1}",
// "???", m.GetType()), this.GetType().ToString());
Debug.WriteLine("Received message:" + m.ToString(),"TCPMessageReceiver");
//If enabled, do client-slide bridging
#if RTP_BUILD
if (this.m_U2MBridge != null) {
this.m_U2MBridge.SendToBridge(m.Clone());
}
#endif
// Send it off for processing.
this.m_Queue.ProcessMessage(m, context);
}
else if (decoded != null) {
Trace.WriteLine("Received unknown message type: " + decoded.GetType().ToString(),
this.GetType().ToString());
}
}
}
else if (message != null) {
Trace.WriteLine("Received unknown message type: " + message.GetType().ToString(),
this.GetType().ToString());
}
}
catch (Exception e) {
// The application should not crash on account of malformed messages sent from remote clients.
// Therefore, we catch all exceptions. We only want to print an error message.
Trace.WriteLine("Error processing a message: " + e.ToString(),
this.GetType().ToString());
}
}
}
