// Prepares data to be sent and calls sending method.
// It can process large messages by cutting them into small ones.
public void SendMessage(AsyncUserTokenBase token, Byte[] msgToSend)
{
// do not let sending simultaniously using the same Args object
token.writeSemaphore.WaitOne();
// pause keep-alive messages (will resume after sending)
token.KeepAliveTimer.Stop();
if (msgToSend.Length == 0)
{
Logger.WriteStr(" Going to send keep-alive message.");
}
else
{
Logger.WriteStr(" Going to send message with length=" + msgToSend.Length + ".");
}
// prepare data to send: add prefix that holds length of message
Byte[] prefixToAdd = BitConverter.GetBytes(msgToSend.Length);
// prepare complete data and store it into token
token.SendingMsg = new Byte[MsgPrefixLength + msgToSend.Length];
prefixToAdd.CopyTo(token.SendingMsg, 0);
msgToSend.CopyTo(token.SendingMsg, MsgPrefixLength);
StartSend(token.writeEventArgs);
}
public void SendKeepAlive(object sender, EventArgs e)
{
AsyncUserTokenBase token = ((KeepAliveTimer)sender).Token;
SendMessage(token, new byte[0]);
}
public KeepAliveTimer(AsyncUserTokenBase token) : base()
{
Token = token;
Interval = 30000; // 30 sec
Enabled = true;
}