unit ServerMainFormManager;

interface

uses
 ...


type

  TServerMainFormManager = class
  private
    m_mainForm : TServerMainForm;
    m_socketListen : Socket;
    m_socketAccept : Socket;
    m_Backlog : integer;
    m_WorkerCallback : AsyncCallback;
    Logger : ILog;
    m_CommandCompleteEvent : TCommandCompleteEventHandler;
    m_currentCommandString : string;
    m_currentCommandStringLocked : boolean;
    m_SendCommandAnswer : string;

    procedure acceptCallback(asyncResult : IAsyncResult);
    procedure onDataReceived(asyncResult : IAsyncResult);
    procedure waitForData(pSocket : Socket);
    procedure processData(newChar : string);

    //Events vom Formular
    procedure ButtonStartClicked(Sender: TObject; Args: EventArgs);
    procedure ButtonSendClicked(Sender: TObject; Args: EventArgs);
    procedure ButtonStopClicked(Sender: TObject; Args: EventArgs);

    //Events
    procedure removeCommandCompleteEvent(event : TCommandCompleteEventHandler);
    procedure addCommandCompleteEvent(event : TCommandCompleteEventHandler);

    function getCurrentCommandString: string;

  public

    property ReceivedCommandString : string read getCurrentCommandString;
    property CommandCompleteEventHandler : TCommandCompleteEventHandler add addCommandCompleteEvent remove removeCommandCompleteEvent;

    constructor Create;
    procedure start();
    procedure SendCommandAnswer(answer:string);

  end;

implementation


{$REGION 'Constructor'}
constructor TServerMainFormManager.Create;
begin
  inherited Create;
  Logger := LogManager.GetLogger('TServerMainFormManager');
  XmlConfigurator.Configure(FileInfo.Create('LogConfig.xml'));
  m_mainForm := TServerMainForm.Create();
  Include(m_mainForm.ButtonStart.Click,ButtonStartClicked);
  Include(m_mainForm.ButtonSend.Click,ButtonSendClicked);
  Include(m_mainForm.ButtonStopServer.Click,ButtonStopClicked);
  m_Backlog := 1;
end;



function TServerMainFormManager.getCurrentCommandString: string;
begin

  //Zuerst den String Locken
  Result := m_currentCommandString;

end;

{$ENDREGION}



{$REGION 'Mainform Events'}
procedure TServerMainFormManager.ButtonStartClicked(Sender: TObject;Args: EventArgs);
var serverPort : integer;
begin

  try

    //einen neuen socket erzeugen
    m_socketListen := Socket.Create(AddressFamily.InterNetwork,
                                    SocketType.Stream,
                                    ProtocolType.Tcp);

    Logger.Debug('New Socket created, Port: '+m_mainForm.NumericUpDownPort.Value.ToString());

    //Port auslesen
    serverPort := Convert.ToInt32(m_mainForm.NumericUpDownPort.Value);
    m_socketListen.Bind(IPEndPoint.Create(IPAddress.Any,serverPort));
    Logger.Debug('Socket Bind');


    //Das Listening starten
    m_socketListen.Listen(m_Backlog);
    Logger.Debug('Socket listening');

    //Rückruf für jeden Clienten
    m_socketListen.BeginAccept(acceptCallback,nil);
    Logger.Debug('Socket waits for Clients');

    if (m_socketListen.Connected) then
      Logger.Debug('Connected');

    m_mainForm.ButtonStart.Enabled := false;
    m_mainForm.ButtonStoPServer.Enabled := true;
    m_mainForm.NumericUpDownPort.Enabled := false;

  except
    on E:SocketException do begin
       Logger.Error(E.Message);
    end;
  end;


end;



procedure TServerMainFormManager.ButtonStopClicked(Sender: TObject;
  Args: EventArgs);
begin

   try

    if assigned(m_socketAccept) and (m_socketAccept.Connected) then
      m_socketAccept.Shutdown(SocketShutdown.Both);

    if assigned(m_socketListen) and m_socketListen.Connected then begin

      m_socketListen.Shutdown(SocketShutdown.Both);
    end;


    m_socketListen.Close();

    m_mainForm.ButtonStart.Enabled := true;
    m_mainForm.ButtonStoPServer.Enabled := false;
    m_mainForm.NumericUpDownPort.Enabled := true;


  except
    on E:SocketException do begin
       Logger.Error(E.Message);
    end;
  end;
end;



procedure TServerMainFormManager.ButtonSendClicked(Sender: TObject;Args: EventArgs);
var objData : TObject;
    byteData : array of byte;
begin

  try

    //Sende Daten an den Client
    Logger.Debug('Send Data to Client...');
    objData := m_mainForm.TextBoxSend.Text;
    byteData := System.Text.Encoding.ASCII.GetBytes(objData.ToString());
    m_socketAccept.Send(byteData);
    Logger.Debug('Data send to Client successful');

  except
    on E:Exception do
      Logger.Error(E.Message);
  end;


end;





{$ENDREGION}



{$REGION 'Private Functions'}
procedure TServerMainFormManager.removeCommandCompleteEvent(event: TCommandCompleteEventHandler);
begin
  m_CommandCompleteEvent := TCommandCompleteEventHandler(Delegate.Remove(@m_CommandCompleteEvent,@event));
end;



procedure TServerMainFormManager.addCommandCompleteEvent(event : TCommandCompleteEventHandler);
begin
  m_CommandCompleteEvent := TCommandCompleteEventHandler(Delegate.Combine(@m_CommandCompleteEvent,@event));
end;

{$ENDREGION}



procedure TServerMainFormManager.start;
begin
  m_mainForm.ShowDialog();
end;



procedure TServerMainFormManager.acceptCallback(asyncResult: IAsyncResult);
begin

  try

      //Callback
      Logger.Debug('Callback');
      m_socketAccept := m_socketListen.EndAccept(asyncResult);
      waitForData(m_socketAccept);

  except
    on E:SocketException do
      Logger.Error(E.Message);
  end;

end;



procedure TServerMainFormManager.waitForData(pSocket: Socket);
var socPkt : TSocketPacket;
begin

  try

    if not assigned(m_WorkerCallback) then begin
      m_WorkerCallback := ondataReceived;
    end;


     socPkt := TSocketPacket.Create();
     socPkt.socket := pSocket;

     //now start to listen for data
     Logger.Debug('Listening for any data...');
     pSocket.BeginReceive(socPkt.dataBuffer,
                           0,
                           length(socPkt.databuffer),
                           SocketFlags.None,
                           m_WorkerCallback,
                           socPkt);

  except
    on E:Exception do
      Logger.Error(E.Message);
  end;

end;



procedure TServerMainFormManager.onDataReceived(asyncResult: IAsyncResult);
var theSockID : TSocketPacket;
    iRx, charLen : integer;
    dec : Decoder;
    chars : array of char;
    szData : string;
begin

  try

    theSockID := TSocketPacket(asyncResult.AsyncState);

    
    //Empfange die Daten
    Logger.Debug('Receive Data');

    iRx := theSockID.socket.EndReceive(asyncResult);
    SetLength(chars,iRx+1);
    dec := System.Text.Encoding.ASCII.GetDecoder();

    charLen := dec.GetChars(theSockID.dataBuffer, 0, iRx, chars, 0);

    szData := string(chars);
    m_mainForm.TextBoxReceived.Text := m_mainForm.TextBoxReceived.Text + szData;

    //Die Daten werden verarbeitet
    processData(szData);

    Logger.Debug(m_currentCommandString);
    waitForData(m_socketAccept);

  except
    on E:ObjectDisposedException do
      Logger.Debug('OnDataReceived: Socket has been closed');
    on E: SocketException do
      Logger.Error(E.Message);
  end;

end;



procedure TServerMainFormManager.processData(newChar: string);
begin
  ...
end;



procedure TServerMainFormManager.SendCommandAnswer(answer: string);
begin
  ...
end;

end.