examples/services/ShutdownDatabaseDlgUnit.pas

(*
 *  IBX For Lazarus (Firebird Express)
 *
 *  The contents of this file are subject to the Initial Developer's
 *  Public License Version 1.0 (the "License"); you may not use this
 *  file except in compliance with the License. You may obtain a copy
 *  of the License here:
 *
 *    http://www.firebirdsql.org/index.php?op=doc&id=idpl
 *
 *  Software distributed under the License is distributed on an "AS
 *  IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 *  implied. See the License for the specific language governing rights
 *  and limitations under the License.
 *
 *  The Initial Developer of the Original Code is Tony Whyman.
 *
 *  The Original Code is (C) 2015 Tony Whyman, MWA Software
 *  (http://www.mwasoftware.co.uk).
 *
 *  All Rights Reserved.
 *
 *  Contributor(s): ______________________________________.
 *
*) 
            
unit ShutdownDatabaseDlgUnit;

{$mode objfpc}{$H+}

interface

uses
  Classes, SysUtils, FileUtil, Forms, Controls, Graphics, Dialogs, StdCtrls,
  ComCtrls, ExtCtrls, IBServices, IB;

type

  { TShutdownDatabaseDlg }

  TShutdownDatabaseDlg = class(TForm)
    Bevel1: TBevel;
    CloseBtn: TButton;
    IBConfigService: TIBConfigService;
    ProgressBar1: TProgressBar;
    StatusMsg: TLabel;
    procedure CloseBtnClick(Sender: TObject);
    procedure FormShow(Sender: TObject);
  private
    FShutDownmode: TShutdownMode;
    FDelay: integer;
    FAborting: boolean;
    FSecContextError: boolean;
    FShutdownWaitThread: TThread;
    procedure OnWaitCompleted(Sender: TObject);
  public
     procedure Shutdown(aShutDownmode: TShutdownMode; aDelay: integer);
     property Aborting: boolean read FAborting;
  end;

var
  ShutdownDatabaseDlg: TShutdownDatabaseDlg;

implementation

{$R *.lfm}

uses IBErrorCodes;

resourcestring
  sWaitStatusMsg = 'Waiting for %s to shutdown';
  sDatabaseShutdown  = 'Database has been successfully shutdown';
  sOnCompleted = 'Shutdown of %s completed with response: %s';

type
    { TShutdownWaitThread }

  TShutdownWaitThread = class(TThread)
  private
    FErrorMessage: string;
    FIBConfigService: TIBConfigService;
    FOptions: TShutdownMode;
    FSecContextError: boolean;
    FSuccess: boolean;
    FWait: integer;
    FOnCompleted: TNotifyEvent;
    procedure DoCallback;
  protected
    procedure Execute; override;
  public
    constructor Create(aService: TIBConfigService; Options: TShutdownMode;
      Wait: Integer; OnCompleted: TNotifyEvent);
    destructor Destroy; override;
    procedure Abort;
    property Success: boolean read FSuccess;
    property SecContextError: boolean read FSecContextError;
    property ErrorMessage: string read FErrorMessage;
  end;


{ TShutdownWaitThread }

procedure TShutdownWaitThread.DoCallback;
begin
  if assigned(FOnCompleted) then
    FOnCompleted(self);
end;

procedure TShutdownWaitThread.Execute;
begin
  FSuccess := false;
  FIBConfigService.Active := true;
  try
    try
      FIBConfigService.ShutDownDatabase(FOptions,FWait);
      FErrorMessage := 'Completed without error';
      FSuccess := true;
    except
      on E: EIBInterBaseError do
        if E.IBErrorCode = isc_sec_context then
          FSecContextError := true
        else
          FErrorMessage := E.Message;

      on E: Exception do
        FErrorMessage := E.Message;
    end;
  finally
    if not FSecContextError then
      while FIBConfigService.IsServiceRunning do;
    if Terminated and FSuccess then
      FIBConfigService.BringDatabaseOnline;
    FIBConfigService.Active := false;
  end;
  Synchronize(@DoCallback);
end;

constructor TShutdownWaitThread.Create(aService: TIBConfigService;
  Options: TShutdownMode; Wait: Integer; OnCompleted: TNotifyEvent);
var Password: string;
begin
  inherited Create(false);
  FOptions := Options;
  FWait := Wait;
  FOnCompleted := OnCompleted;
  FreeOnTerminate := true;
  FIBConfigService := TIBConfigService.Create(nil);
  FIBConfigService.Assign(aService);
  FIBConfigService.DatabaseName := aService.DatabaseNAme;
end;

destructor TShutdownWaitThread.Destroy;
begin
  if FIBConfigService <> nil then FIBConfigService.Free;
  inherited Destroy;
end;

procedure TShutdownWaitThread.Abort;
begin
  Terminate;
end;

{ TShutdownDatabaseDlg }

procedure TShutdownDatabaseDlg.FormShow(Sender: TObject);
begin
  FAborting := false;
  StatusMsg.Caption := Format(sWaitStatusMsg,[IBConfigService.DatabaseName]);
  FShutdownWaitThread := TShutdownWaitThread.Create(IBConfigService,FShutDownMode,FDelay,@OnWaitCompleted);
end;

procedure TShutdownDatabaseDlg.CloseBtnClick(Sender: TObject);
begin
  FAborting := true;
  FShutdownWaitThread.Terminate;
  Close;
end;

procedure TShutdownDatabaseDlg.OnWaitCompleted(Sender: TObject);
begin
  with TShutdownWaitThread(Sender) do
    if not Success and SecContextError then
      self.FSecContextError := true
    else
    if not FAborting then
      MessageDlg(Format(sOnCompleted,[IBConfigService.DatabaseName,ErrorMessage]),
               mtInformation,[mbOK],0);
  FAborting := false;
  Close;
end;

procedure TShutdownDatabaseDlg.Shutdown(aShutDownmode: TShutdownMode; aDelay: integer);
begin
  FShutDownmode := aShutDownmode;
  FDelay := aDelay;
  FSecContextError := false;
  if aDelay <= 0 then
  begin
    IBConfigService.Active := true;
    try
      IBConfigService.ShutDownDatabase(aShutDownmode,0);
      while IBConfigService.IsServiceRunning do;
      if aDelay = 0 then
        MessageDlg(sDatabaseShutdown,mtInformation,[mbOK],0);
    finally
      IBConfigService.Active := false;
    end
  end
  else
  begin
    ShowModal;
    if FSecContextError  then
      raise EIBInterBaseError.Create(FirebirdAPI.getStatus); {re-raise the error}
  end;
end;

end.

Revision:	143
Committed:	Fri Feb 23 12:11:21 2018 UTC (6 years, 2 months ago) by tony
Content type:	text/x-pascal
File size:	5698 byte(s)
Log Message:	Fixes Merged
#	Content
1	(*
2	* IBX For Lazarus (Firebird Express)
3	*
4	* The contents of this file are subject to the Initial Developer's
5	* Public License Version 1.0 (the "License"); you may not use this
6	* file except in compliance with the License. You may obtain a copy
7	* of the License here:
8	*
9	* http://www.firebirdsql.org/index.php?op=doc&id=idpl
10	*
11	* Software distributed under the License is distributed on an "AS
12	* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
13	* implied. See the License for the specific language governing rights
14	* and limitations under the License.
15	*
16	* The Initial Developer of the Original Code is Tony Whyman.
17	*
18	* The Original Code is (C) 2015 Tony Whyman, MWA Software
19	* (http://www.mwasoftware.co.uk).
20	*
21	* All Rights Reserved.
22	*
23	* Contributor(s): ______________________________________.
24	*
25	*)
26
27	unit ShutdownDatabaseDlgUnit;
28
29	{$mode objfpc}{$H+}
30
31	interface
32
33	uses
34	Classes, SysUtils, FileUtil, Forms, Controls, Graphics, Dialogs, StdCtrls,
35	ComCtrls, ExtCtrls, IBServices, IB;
36
37	type
38
39	{ TShutdownDatabaseDlg }
40
41	TShutdownDatabaseDlg = class(TForm)
42	Bevel1: TBevel;
43	CloseBtn: TButton;
44	IBConfigService: TIBConfigService;
45	ProgressBar1: TProgressBar;
46	StatusMsg: TLabel;
47	procedure CloseBtnClick(Sender: TObject);
48	procedure FormShow(Sender: TObject);
49	private
50	FShutDownmode: TShutdownMode;
51	FDelay: integer;
52	FAborting: boolean;
53	FSecContextError: boolean;
54	FShutdownWaitThread: TThread;
55	procedure OnWaitCompleted(Sender: TObject);
56	public
57	procedure Shutdown(aShutDownmode: TShutdownMode; aDelay: integer);
58	property Aborting: boolean read FAborting;
59	end;
60
61	var
62	ShutdownDatabaseDlg: TShutdownDatabaseDlg;
63
64	implementation
65
66	{$R *.lfm}
67
68	uses IBErrorCodes;
69
70	resourcestring
71	sWaitStatusMsg = 'Waiting for %s to shutdown';
72	sDatabaseShutdown = 'Database has been successfully shutdown';
73	sOnCompleted = 'Shutdown of %s completed with response: %s';
74
75	type
76	{ TShutdownWaitThread }
77
78	TShutdownWaitThread = class(TThread)
79	private
80	FErrorMessage: string;
81	FIBConfigService: TIBConfigService;
82	FOptions: TShutdownMode;
83	FSecContextError: boolean;
84	FSuccess: boolean;
85	FWait: integer;
86	FOnCompleted: TNotifyEvent;
87	procedure DoCallback;
88	protected
89	procedure Execute; override;
90	public
91	constructor Create(aService: TIBConfigService; Options: TShutdownMode;
92	Wait: Integer; OnCompleted: TNotifyEvent);
93	destructor Destroy; override;
94	procedure Abort;
95	property Success: boolean read FSuccess;
96	property SecContextError: boolean read FSecContextError;
97	property ErrorMessage: string read FErrorMessage;
98	end;
99
100
101
102	{ TShutdownWaitThread }
103
104	procedure TShutdownWaitThread.DoCallback;
105	begin
106	if assigned(FOnCompleted) then
107	FOnCompleted(self);
108	end;
109
110	procedure TShutdownWaitThread.Execute;
111	begin
112	FSuccess := false;
113	FIBConfigService.Active := true;
114	try
115	try
116	FIBConfigService.ShutDownDatabase(FOptions,FWait);
117	FErrorMessage := 'Completed without error';
118	FSuccess := true;
119	except
120	on E: EIBInterBaseError do
121	if E.IBErrorCode = isc_sec_context then
122	FSecContextError := true
123	else
124	FErrorMessage := E.Message;
125
126	on E: Exception do
127	FErrorMessage := E.Message;
128	end;
129	finally
130	if not FSecContextError then
131	while FIBConfigService.IsServiceRunning do;
132	if Terminated and FSuccess then
133	FIBConfigService.BringDatabaseOnline;
134	FIBConfigService.Active := false;
135	end;
136	Synchronize(@DoCallback);
137	end;
138
139	constructor TShutdownWaitThread.Create(aService: TIBConfigService;
140	Options: TShutdownMode; Wait: Integer; OnCompleted: TNotifyEvent);
141	var Password: string;
142	begin
143	inherited Create(false);
144	FOptions := Options;
145	FWait := Wait;
146	FOnCompleted := OnCompleted;
147	FreeOnTerminate := true;
148	FIBConfigService := TIBConfigService.Create(nil);
149	FIBConfigService.Assign(aService);
150	FIBConfigService.DatabaseName := aService.DatabaseNAme;
151	end;
152
153	destructor TShutdownWaitThread.Destroy;
154	begin
155	if FIBConfigService <> nil then FIBConfigService.Free;
156	inherited Destroy;
157	end;
158
159	procedure TShutdownWaitThread.Abort;
160	begin
161	Terminate;
162	end;
163
164	{ TShutdownDatabaseDlg }
165
166	procedure TShutdownDatabaseDlg.FormShow(Sender: TObject);
167	begin
168	FAborting := false;
169	StatusMsg.Caption := Format(sWaitStatusMsg,[IBConfigService.DatabaseName]);
170	FShutdownWaitThread := TShutdownWaitThread.Create(IBConfigService,FShutDownMode,FDelay,@OnWaitCompleted);
171	end;
172
173	procedure TShutdownDatabaseDlg.CloseBtnClick(Sender: TObject);
174	begin
175	FAborting := true;
176	FShutdownWaitThread.Terminate;
177	Close;
178	end;
179
180	procedure TShutdownDatabaseDlg.OnWaitCompleted(Sender: TObject);
181	begin
182	with TShutdownWaitThread(Sender) do
183	if not Success and SecContextError then
184	self.FSecContextError := true
185	else
186	if not FAborting then
187	MessageDlg(Format(sOnCompleted,[IBConfigService.DatabaseName,ErrorMessage]),
188	mtInformation,[mbOK],0);
189	FAborting := false;
190	Close;
191	end;
192
193	procedure TShutdownDatabaseDlg.Shutdown(aShutDownmode: TShutdownMode; aDelay: integer);
194	begin
195	FShutDownmode := aShutDownmode;
196	FDelay := aDelay;
197	FSecContextError := false;
198	if aDelay <= 0 then
199	begin
200	IBConfigService.Active := true;
201	try
202	IBConfigService.ShutDownDatabase(aShutDownmode,0);
203	while IBConfigService.IsServiceRunning do;
204	if aDelay = 0 then
205	MessageDlg(sDatabaseShutdown,mtInformation,[mbOK],0);
206	finally
207	IBConfigService.Active := false;
208	end
209	end
210	else
211	begin
212	ShowModal;
213	if FSecContextError then
214	raise EIBInterBaseError.Create(FirebirdAPI.getStatus); {re-raise the error}
215	end;
216	end;
217
218	end.
219