public static void SendMessage(string textMessage)
{
_serverParcel.Msg = textMessage;
_serverParcel.TimeStamp = DateTime.Now;
//update DB with the server message
TCPServerDB.AddNewMessage(_serverParcel);
SendParcel(_serverParcel);
}
private static void cHandler_ParcelArrived(object sender, Parcel e)
{
if (e.Msg.Contains("***has connected***"))
{
//a special connection message
OnClientConnected(new ClientConnectedArgs
{
Id = e.SenderID,
UserName = e.UserName,
ConnectionTime = e.TimeStamp
});
}
if (e.Msg.Contains("***HAS LEFT THE CHAT***"))
{
// a special disconnection message
OnClientDisconnected(new ClientDisconnectedArgs
{
Id = e.SenderID,
UserName = e.UserName,
ConnectionTime = e.TimeStamp
});
}
if (e.Msg.Contains("***Checking"))
//client checks whether the username is registered
//such messsages are not sent to other clients
{
//extractUserName from the message
string extractedUserName = e.Msg.Substring("***Checking".Length,
e.Msg.IndexOf("***Name") - "***Checking".Length);
//extract the name from the message
string extractedName = e.Msg.Substring(e.Msg.IndexOf("***Name") + "***Name".Length,
e.Msg.Length - "***Name".Length - e.Msg.IndexOf("***Name"));
//query DB findByUserName
if (TCPServerDB.FindByUserName(extractedUserName) != null)
{
//if UserName found, then send confirmation message to client
SendMessage("***Checked" + extractedUserName + "***Name");
return;
}
//sent without a name -
if (extractedName == string.Empty)
{
//if UserName not found then send NoSuchUser
SendMessage("***nosuchuser");
return;
}
TCPServerDB.AddNewUser(extractedUserName, extractedName);
//after the UserName and private name are registered, then send confirmation message to client
SendMessage("***Checked" + extractedUserName + "***Name");
return;
}
SendParcel(e);
OnServerParcelReceived(e);
}
private static void OnServerParcelReceived(Parcel e)
{
TCPServerDB.AddNewMessage(e);
EventHandler <Parcel> handler = ServerParcelReceived;
if (handler != null)
{
handler(null, e);
}
}
private static void OnClientConnected(ClientConnectedArgs firstTimeConnection)
{
//update DB
TCPServerDB.UpdateUserConnectionStatus(firstTimeConnection.UserName, true);
EventHandler <ClientConnectedArgs> handler = ClientConnected;
if (handler != null)
{
handler(null, firstTimeConnection);
}
}
private static void OnClientDisconnected(ClientDisconnectedArgs e)
{
//update DB
TCPServerDB.UpdateUserConnectionStatus(e.UserName, false);
ClientHandler ch;
//trying to remove the disconnected user
SocketConnections.TryGetValue(e.Id, out ch);
if (ch != null)
{
ch.TokenSourceConnection.Cancel();
ch.Dispose();
SocketConnections.Remove(e.Id);
}
EventHandler <ClientDisconnectedArgs> handler = ClientDisconnected;
if (handler != null)
{
handler(null, e);
}
}