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, 8 months ago) by tony
Content type:	text/x-pascal
File size:	5698 byte(s)
Log Message:	Fixes Merged
#	User	Rev	Content
1	tony	143	(*
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