unit AsyncClientMain;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, uROWinInetHttpChannel,
  uROClient, uROBINMessage,
  AsyncLibrary_Async, ExtCtrls, uROIndyUDPChannel;

type
  TAsyncClientMainForm = class(TForm)
    ed_Value1: TEdit;
    ed_Value2: TEdit;
    CalcLiveButton: TButton;
    CalcAsyncHttpButton: TButton;
    GetResultButton: TButton;
    ed_Result: TEdit;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    ROBINMessage1: TROBINMessage;
    ROWinInetHTTPChannel1: TROWinInetHTTPChannel;
    Label4: TLabel;
    lbl_Status: TLabel;
    CheckForAnswerBytton: TButton;
    ROIndyUDPChannel1: TROIndyUDPChannel;
    CalcAsyncUdpButton: TButton;
    procedure CalcLiveButtonClick(Sender: TObject);
    procedure CalcAsyncHttpButtonClick(Sender: TObject);
    procedure GetResultButtonClick(Sender: TObject);
    procedure CheckForAnswerByttonClick(Sender: TObject);
    procedure CalcAsyncUdpButtonClick(Sender: TObject);
  protected
    fAsyncService: IAsyncService_Async;
    procedure AdjustButtons; virtual;
  public
    { Public declarations }
  end;

var
  AsyncClientMainForm: TAsyncClientMainForm;

implementation
uses AsyncLibrary_Intf;

{$R *.dfm}

procedure TAsyncClientMainForm.CalcLiveButtonClick(Sender: TObject);
begin
  Screen.Cursor := crHourGlass;
  try
    with CoAsyncService.Create(ROBINMessage1, ROWinInetHTTPChannel1) do begin
      ed_Result.Text := '';
      ed_Result.Repaint();
      ed_Result.Text := IntToStr(Sum(StrToInt(ed_Value1.Text), StrToInt(ed_Value2.Text)));
    end; { with }
  finally
    Screen.Cursor := crDefault;
  end; { try/finally }
end;

procedure TAsyncClientMainForm.CalcAsyncHttpButtonClick(Sender: TObject);
begin
  Screen.Cursor := crHourGlass;
  try

    if not Assigned(fAsyncService) then
      fAsyncService := CoAsyncService_Async.Create(ROBINMessage1, ROWinInetHTTPChannel1);

    ed_Result.Text := '';
    ed_Result.Repaint();

    fAsyncService.Invoke_Sum(StrToInt(ed_Value1.Text), StrToInt(ed_Value2.Text));
    AdjustButtons();

  finally
    Screen.Cursor := crDefault;
  end;

  ShowMessage('The request has been sent to the Server.'#13'Click "Retrieve Result" to check if an answer has been received yet.');
end;

procedure TAsyncClientMainForm.CalcAsyncUdpButtonClick(Sender: TObject);
begin
  Screen.Cursor := crHourGlass;
  try

    if not Assigned(fAsyncService) then
      fAsyncService := CoAsyncService_Async.Create(ROBINMessage1, ROIndyUDPChannel1);

    ed_Result.Text := '';
    ed_Result.Repaint();

    fAsyncService.Invoke_Sum(StrToInt(ed_Value1.Text), StrToInt(ed_Value2.Text));
    AdjustButtons();

  finally
    Screen.Cursor := crDefault;
  end;

  ShowMessage('The request has been sent to the Server.'#13'Click "Retrieve Result" to check if an answer has been received yet.');
end;

procedure TAsyncClientMainForm.GetResultButtonClick(Sender: TObject);
begin
  if not Assigned(fAsyncService) then exit;

  Screen.Cursor := crHourGlass;
  try

    if fAsyncService.AnswerReceived then begin
      ed_Result.Text := IntToStr(fAsyncService.Retrieve_Sum());
      fAsyncService := nil;
      lbl_Status.Caption := 'Idle';
    end
    else begin
      ShowMessage('Sorry, no answer yet.');
    end;
    AdjustButtons();

  finally
    Screen.Cursor := crDefault;
  end;
end;

procedure TAsyncClientMainForm.CheckForAnswerByttonClick(Sender: TObject);
begin
  Screen.Cursor := crHourGlass;
  try

    if Assigned(fAsyncService) then begin
      if fAsyncService.AnswerReceived then begin
        lbl_Status.Caption := 'Answer Received';
        ShowMessage('Answer received!');
      end
      else if fAsyncService.Busy then begin
        lbl_Status.Caption := 'Busy';
        ShowMessage('Sorry, no answer yet.');
      end
      else begin
        lbl_Status.Caption := 'Idle';
        ShowMessage('Sorry, no answer yet.');
      end;
    end;

  finally
    Screen.Cursor := crDefault;
  end;
end;

procedure TAsyncClientMainForm.AdjustButtons;
begin
  CalcAsyncHttpButton.Enabled := not Assigned(fAsyncService);
  CalcAsyncUdpButton.Enabled := not Assigned(fAsyncService);
  GetResultButton.Enabled := Assigned(fAsyncService);
  CheckForAnswerBytton.Enabled := Assigned(fAsyncService);
end;

end.