public MsgState ProcessStates(out MessageEventArgs mea)
{
mea = processMea();
switch (this._state)
{
case MsgState.Idle:
if (this._msgs2Send.Count > 0)
{
lock (this._msgs2Send)
{
this._msg2Go = this._msgs2Send.Dequeue();
}
if (!String.IsNullOrWhiteSpace(this._msg2Go))
{
this._msgProcessed = false;
this._attempt = 0;
this._imSendingAck = false;
this._state = MsgState.ReadyForRemote;
}
}
break;
case MsgState.ReadyForRemote:
this._startTime = DateTime.Now;
if (this._attempt >= 3)
{
this._state = MsgState.Idle;
}
else if (this._msgProcessed)
{
this._state = MsgState.WaitingResponse;
}
break;
case MsgState.WaitingResponse:
// message was already sent out, check timeout
DateTime endTime = DateTime.Now;
if (endTime.Subtract(this._startTime).Milliseconds >= 799)
{
Sock.debug(_name + ": timeout, repeating");
this._msgProcessed = false;
this._attempt++;
this._state = MsgState.ReadyForRemote;
}
break;
case MsgState.ReadyForAck:
this._msgProcessed = false;
this._msg2Go = this._lastAckMsg;
this._state = MsgState.SendAck;
break;
case MsgState.SendAck:
if (this._msgProcessed)
{
this._msgProcessed = false;
this._imSendingAck = false;
this._state = MsgState.Done;
}
break;
case MsgState.Done:
this._state = MsgState.Idle;
break;
default: break;
}
return(this._state);
}
private MessageEventArgs processMea()
{
string localMsg;
int myIndex;
lock (_buildMsg)
{
localMsg = _buildMsg.ToString();
myIndex = localMsg.IndexOf("<EOF>");
if (myIndex >= 0)
{
localMsg = localMsg.Substring(0, myIndex + 1 + 4).Trim();
_buildMsg.Remove(0, myIndex + 1 + 4);
}
}
if (myIndex >= 0)
{
MessageEventArgs mea = new MessageEventArgs(localMsg);
if (mea.Valid)
{
// for safety
_buddyIp = mea.FriendIP;
if (this._state == MsgState.WaitingResponse || this._state == MsgState.SendAck)
{
Sock.debug(_name + ":got ACK:" + this._state.ToString() + ":Id=" + mea.Id);
mea.IsAck = true;
if (this._state == MsgState.WaitingResponse)
{
this._state = MsgState.Done;
}
return(mea);
}
if (this._imSendingAck || mea.FriendIP == myip)
{
if (this._state == MsgState.WaitingResponse)
{
this._state = MsgState.Done;
}
return(null);
}
else if (this._state == MsgState.Idle || this._state == MsgState.ReadyForRemote)
{
this._imSendingAck = true;
_lastAckMsg = generate(mea.Id, mea.FriendName, mea.FriendIP, Sock.Checksum(mea.TextFromFriend)); // no need to send entire msg payload
_lastAckIP = mea.FriendIP;
Sock.debug(_name + ":Display(sendAck)" + this._state.ToString() + ":Id=" + mea.Id);
this._state = MsgState.ReadyForAck;
}
else
{
return(mea);
}
}
else
{
Sock.debug(_name + ": oops, invalid message received");
}
return(mea);
}
else
{
return(null);
}
}