public ITransmissionHandler createTransmissionHandler(int type)
{
ITransmissionHandler createdHandler = null;
switch (type)
{
case 3:
createdHandler = new ConcreteTransmissionHandler(new HandleRemoveUserTransmissionStrategy());
break;
case 4:
createdHandler = new ConcreteTransmissionHandler(new HandleAddUserTransmissionStrategy());
break;
case 5:
createdHandler = new ConcreteTransmissionHandler(new HandleConversationTransmissionStrategy());
break;
case 6:
createdHandler = new ConcreteTransmissionHandler(new HandleMessageTransmissionStrategy());
break;
default:
createdHandler = null;
break;
}
return(createdHandler);
}
/// <summary>
/// Executed by listener thread.
/// </summary>
private void listen()
{
try
{
int headerLength = BitConverter.GetBytes(4).Length + 1;
byte[] headerBytes = new byte[headerLength];
ITransmissionHandlerCreator factory = new ConcreteTransmissionHandlerCreator(); //will create context for strategy pattern
lock (this)
{
while (goOn)
{
int bytesReceived = 0;
if (socket.Available == 0)
{
Thread.Sleep(100);
continue;
}
while (bytesReceived < headerLength)
{
bytesReceived += socket.Receive(headerBytes, bytesReceived, headerLength - bytesReceived, SocketFlags.None);
}
byte type = headerBytes[0];
int messageLength = BitConverter.ToInt32(headerBytes, 1);
byte[] inBuffer = socketFacade.receiveMessage(messageLength);
if (type == (byte)1) //received boolean response
{
responseStatus = (inBuffer[0] == (byte)0) ? false : true;
responseReady = true;
Monitor.Pulse(this);
Monitor.Wait(this);
}
else //received transmission of some sort
{
ITransmissionHandler transmissionHandler = factory.createTransmissionHandler(type); //create strategy pattern context
transmissionHandler.handle(this, inBuffer); //thanks to the pattern we don't worry here what transmission exactly it is
}
}
}
}
catch (Exception ex)
{
Console.WriteLine("Exception thrown in listener: {0}", ex.Message);
Console.WriteLine(ex.StackTrace);
}
}
