/// <summary>
/// Listens for this instance.
/// </summary>
private void SwitchListening()
{
try
{
NetworkStream clientStream = this.Client.GetStream();
byte[] message;
int bytesRead;
WriteStream caller = new WriteStream(this.parentNode.WriteToNetworkStream);
while (true)
{
bytesRead = 0;
message = GlobalConst.getSpaceByteArray(GlobalConst.BUFSIZE);
lock (this.toSend)
{
if (this.toSend.Count < 1)
{
clientStream.ReadTimeout = 30000;
}
}
try
{
//blocks until a client sends a message
bytesRead = clientStream.Read(message, 0, GlobalConst.BUFSIZE);
}
catch
{
//a socket error has occured
Console.WriteLine("Socket error on node " + this.parentNode.Name);
break;
}
if (bytesRead == 0)
{
//the client has disconnected from the server
Console.WriteLine("Node " + this.parentNode.Name + " has disconnected from the switch.");
break;
}
SwitchMessage msg = new SwitchMessage();
bool msgOk = msg.Decode(message);
Console.WriteLine("Got message on switch node " + this.parentNode.Name);
if(!msgOk)
{
}
else if (msg.Ack)
{
if (SenderThread.ThreadState.Equals(ThreadState.WaitSleepJoin))
{
//Notify the sender thread that the receiving node did get it.
SenderThread.Interrupt();
}
else
{
//Console.WriteLine("Node {0} sent to node {1} (really {2}) an ack when it wasn't supposed to!", msg.Sender, msg.Destination, this.name);
}
}
else
{
//message has successfully been received
parentNode.writeOutMessage(msg);
SwitchMessage ackMsg = new SwitchMessage();
ackMsg.EncodeHiddenComm(msg.Sender, msg.Destination);
lock (clientStream)
{
if (clientStream.CanWrite)
{
caller.BeginInvoke(clientStream, ackMsg, null, null);
}
else
{
Console.WriteLine("Node " + this.ParentNode.Name + " can't send an ack.");
}
}
}
}
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
if(!this.doneSending)
{
this.senderThread.Abort();
this.doneSending = true;
}
this.doneReceiving = true;
while(!this.parentThread.ThreadState.Equals(ThreadState.WaitSleepJoin))
{
Thread.Sleep(100);
}
this.parentThread.Interrupt();
//this.client.Close();
}
/// <summary>
/// Handles the client comm. STarts a new thread for each node.
/// </summary>
/// <param name="clientObject">The client object.</param>
private void HandleClientComm(object clientObject)
{
try
{
TcpClient client = (TcpClient)clientObject;
NetworkStream clientStream = client.GetStream();
byte[] message;
int bytesRead;
while (true)
{
bytesRead = 0;
message = GlobalConst.getSpaceByteArray(GlobalConst.BUFSIZE);
try
{
//blocks until a client sends a message
bytesRead = clientStream.Read(message, 0, GlobalConst.BUFSIZE);
}
catch
{
//a socket error has occured
break;
}
if (bytesRead == 0)
{
//the client has disconnected from the server
//this.nodeDisconnectedCount++;
break;
}
SwitchMessage msg = new SwitchMessage();
bool msgOk = msg.Decode(message);
if(!msgOk)
{
continue;
}
checkIfKnown(client, msg.Sender);
//message has successfully been received
try
{
if (msg.Destination.Equals(GlobalConst.serverName))
{
this.nodeDisconnectedCount++;
}
else
{
enqueMessage(msg);
}
}
catch
{
if (msg.Destination == null)
{
Console.WriteLine("msg.Dest is null.");
}
else if (GlobalConst.serverName == null)
{
Console.WriteLine("ServerName is null.");
}
}
}
}
catch(ThreadInterruptedException)
{
TcpClient c = (TcpClient)clientObject;
c.Close();
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}
