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tony |
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{************************************************************************}
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{ }
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{ Borland Delphi Visual Component Library }
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{ InterBase Express core components }
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{ }
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{ Copyright (c) 1998-2000 Inprise Corporation }
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{ }
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{ InterBase Express is based in part on the product }
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{ Free IB Components, written by Gregory H. Deatz for }
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{ Hoagland, Longo, Moran, Dunst & Doukas Company. }
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{ Free IB Components is used under license. }
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{ }
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{ The contents of this file are subject to the InterBase }
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{ Public License Version 1.0 (the "License"); you may not }
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{ use this file except in compliance with the License. You }
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{ may obtain a copy of the License at http://www.Inprise.com/IPL.html }
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{ Software distributed under the License is distributed on }
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{ an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either }
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{ express or implied. See the License for the specific language }
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{ governing rights and limitations under the License. }
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{ The Original Code was created by InterBase Software Corporation }
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{ and its successors. }
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{ Portions created by Inprise Corporation are Copyright (C) Inprise }
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{ Corporation. All Rights Reserved. }
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{ Contributor(s): Jeff Overcash }
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{ }
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tony |
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{ IBX For Lazarus (Firebird Express) }
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{ Contributor: Tony Whyman, MWA Software http://www.mwasoftware.co.uk }
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{ Portions created by MWA Software are copyright McCallum Whyman }
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{ Associates Ltd 2011 }
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{ }
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tony |
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{************************************************************************}
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tony |
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{
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This unit has been almost completely re-written as the original code was
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not that robust - and I am not even sure if it worked. The IBPP C++ implementation
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was used for guidance and inspiration. A permanent thread is used to receive
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events from the asynchronous event handler. This then uses "Synchronize" to
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process the event in the main thread.
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Note that an error will occur if the TIBEvent's Registered property is set to
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true before the Database has been opened.
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}
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tony |
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unit IBEvents;
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tony |
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{$Mode Delphi}
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tony |
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interface
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uses
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tony |
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{$IFDEF WINDOWS }
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Windows,
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tony |
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{$ELSE}
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tony |
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unix,
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{$ENDIF}
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Classes, Graphics, Controls,
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tony |
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Forms, Dialogs, IBHeader, IBExternals, IB, IBDatabase;
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const
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MaxEvents = 15;
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type
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TEventAlert = procedure( Sender: TObject; EventName: string; EventCount: longint;
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var CancelAlerts: Boolean) of object;
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tony |
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{ TIBEvents }
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TIBEvents = class(TComponent)
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private
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FIBLoaded: Boolean;
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tony |
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FBase: TIBBase;
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tony |
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FEvents: TStrings;
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FOnEventAlert: TEventAlert;
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FEventHandler: TObject;
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FRegistered: boolean;
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FDeferredRegister: boolean;
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procedure EventChange(sender: TObject);
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function GetDatabase: TIBDatabase;
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function GetDatabaseHandle: TISC_DB_HANDLE;
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tony |
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procedure SetDatabase( value: TIBDatabase);
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procedure ValidateDatabase( Database: TIBDatabase);
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tony |
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procedure DoBeforeDatabaseDisconnect(Sender: TObject);
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procedure DoAfterDatabaseConnect(Sender: TObject);
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tony |
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protected
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procedure Notification( AComponent: TComponent; Operation: TOperation); override;
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procedure SetEvents( value: TStrings);
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procedure SetRegistered( value: boolean);
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public
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constructor Create( AOwner: TComponent); override;
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destructor Destroy; override;
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procedure RegisterEvents;
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procedure UnRegisterEvents;
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tony |
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property DatabaseHandle: TISC_DB_HANDLE read GetDatabaseHandle;
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property DeferredRegister: boolean read FDeferredRegister write FDeferredRegister;
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published
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property Database: TIBDatabase read GetDatabase write SetDatabase;
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property Events: TStrings read FEvents write SetEvents;
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property Registered: Boolean read FRegistered write SetRegistered;
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property OnEventAlert: TEventAlert read FOnEventAlert write FOnEventAlert;
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end;
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tony |
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tony |
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implementation
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uses
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tony |
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IBIntf, syncobjs;
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tony |
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tony |
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type
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TEventHandlerStates = (
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stIdle, {Events not monitored}
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stHasEvb, {Event Block Allocated but not queued}
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stQueued, {Waiting for Event}
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stSignalled {Event Callback signalled Event}
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);
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{ TEventHandler }
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TEventHandler = class(TThread)
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private
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FOwner: TIBEvents;
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FCriticalSection: TCriticalSection; {protects race conditions in stQueued state}
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{$IFDEF WINDOWS}
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{Make direct use of Windows API as TEventObject don't seem to work under
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Windows!}
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FEventHandler: THandle;
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{$ELSE}
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FEventWaiting: TEventObject;
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{$ENDIF}
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FState: TEventHandlerStates;
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FEventBuffer: PChar;
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FEventBufferLen: integer;
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FEventID: ISC_LONG;
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FRegisteredState: Boolean;
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FResultBuffer: PChar;
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FEvents: TStringList;
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FSignalFired: boolean;
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procedure QueueEvents;
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procedure CancelEvents;
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procedure HandleEventSignalled(length: short; updated: PChar);
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procedure DoEventSignalled;
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protected
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procedure Execute; override;
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public
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constructor Create(Owner: TIBEvents);
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destructor Destroy; override;
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procedure Terminate;
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procedure RegisterEvents(Events: TStrings);
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procedure UnregisterEvents;
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end;
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{This procedure is used for the event call back - note the cdecl }
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procedure IBEventCallback( ptr: pointer; length: short; updated: PChar); cdecl;
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tony |
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begin
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tony |
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if (ptr = nil) or (length = 0) or (updated = nil) then
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Exit;
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{ Handle events asynchronously in second thread }
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TEventHandler(ptr).HandleEventSignalled(length,updated);
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tony |
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end;
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tony |
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{ TEventHandler }
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procedure TEventHandler.QueueEvents;
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var
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callback: pointer;
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DBH: TISC_DB_HANDLE;
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tony |
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begin
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tony |
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if FState <> stHasEvb then
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Exit;
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FCriticalSection.Enter;
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try
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callback := @IBEventCallback;
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DBH := FOwner.DatabaseHandle;
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if (isc_que_events( StatusVector, @DBH, @FEventID, FEventBufferLen,
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FEventBuffer, TISC_CALLBACK(callback), PVoid(Self)) <> 0) then
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IBDatabaseError;
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FState := stQueued
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finally
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FCriticalSection.Leave
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end;
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tony |
1 |
end;
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tony |
7 |
procedure TEventHandler.CancelEvents;
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var
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DBH: TISC_DB_HANDLE;
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begin
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if FState in [stQueued,stSignalled] then
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begin
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FCriticalSection.Enter;
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try
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DBH := FOwner.DatabaseHandle;
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if (isc_Cancel_events( StatusVector, @DBH, @FEventID) <> 0) then
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IBDatabaseError;
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FState := stHasEvb;
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finally
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FCriticalSection.Leave
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end;
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end;
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tony |
1 |
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7 |
if FState = stHasEvb then
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begin
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isc_free( FEventBuffer);
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FEventBuffer := nil;
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isc_free( FResultBuffer);
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FResultBuffer := nil;
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FState := stIdle
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end;
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FSignalFired := false
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end;
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procedure TEventHandler.HandleEventSignalled(length: short; updated: PChar);
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tony |
1 |
begin
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tony |
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FCriticalSection.Enter;
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tony |
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try
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tony |
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if FState <> stQueued then
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Exit;
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Move(Updated[0], FResultBuffer[0], Length);
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FState := stSignalled;
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{$IFDEF WINDOWS}
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SetEVent(FEventHandler);
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{$ELSE}
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FEventWaiting.SetEvent;
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{$ENDIF}
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finally
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FCriticalSection.Leave
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tony |
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end;
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end;
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procedure TEventHandler.DoEventSignalled;
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var
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i: integer;
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CancelAlerts: boolean;
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Status: array[0..19] of ISC_LONG; {Note in 64 implementation the ibase.h implementation
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is different from Interbase 6.0 API documentatoin}
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tony |
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begin
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tony |
7 |
if FState <> stSignalled then
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Exit;
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isc_event_counts( @Status, FEventBufferLen, FEventBuffer, FResultBuffer);
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CancelAlerts := false;
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if not FSignalFired then
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FSignalFired := true {Ignore first time}
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else
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if assigned(FOwner.FOnEventAlert) then
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begin
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for i := 0 to FEvents.Count - 1 do
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begin
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try
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if (Status[i] <> 0) and not CancelAlerts then
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FOwner.FOnEventAlert( self, FEvents[i], Status[i], CancelAlerts);
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except
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Application.HandleException( nil);
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end;
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259 |
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end;
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260 |
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end;
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261 |
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FState := stHasEvb;
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262 |
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if CancelAlerts then
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263 |
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CancelEvents
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264 |
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else
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265 |
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QueueEvents
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266 |
tony |
1 |
end;
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267 |
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268 |
tony |
7 |
procedure TEventHandler.Execute;
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269 |
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begin
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270 |
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while not Terminated do
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271 |
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begin
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272 |
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{$IFDEF WINDOWS}
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273 |
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WaitForSingleObject(FEventHandler,INFINITE);
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274 |
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{$ELSE}
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275 |
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FEventWaiting.WaitFor(INFINITE);
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276 |
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{$ENDIF}
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277 |
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278 |
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if not Terminated and (FState = stSignalled) then
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279 |
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Synchronize(DoEventSignalled)
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280 |
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end;
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281 |
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end;
|
282 |
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283 |
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284 |
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285 |
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constructor TEventHandler.Create(Owner: TIBEvents);
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286 |
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var
|
287 |
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PSa : PSecurityAttributes;
|
288 |
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{$IFDEF WINDOWS}
|
289 |
|
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Sd : TSecurityDescriptor;
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290 |
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Sa : TSecurityAttributes;
|
291 |
|
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begin
|
292 |
|
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InitializeSecurityDescriptor(@Sd,SECURITY_DESCRIPTOR_REVISION);
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293 |
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SetSecurityDescriptorDacl(@Sd,true,nil,false);
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294 |
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Sa.nLength := SizeOf(Sa);
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295 |
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Sa.lpSecurityDescriptor := @Sd;
|
296 |
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Sa.bInheritHandle := true;
|
297 |
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PSa := @Sa;
|
298 |
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{$ELSE}
|
299 |
|
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begin
|
300 |
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PSa:= nil;
|
301 |
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{$ENDIF}
|
302 |
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inherited Create(true);
|
303 |
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FOwner := Owner;
|
304 |
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FState := stIdle;
|
305 |
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FCriticalSection := TCriticalSection.Create;
|
306 |
|
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{$IFDEF WINDOWS}
|
307 |
|
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FEventHandler := CreateEvent(PSa,false,true,nil);
|
308 |
|
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{$ELSE}
|
309 |
|
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FEventWaiting := TEventObject.Create(PSa,false,true,FOwner.Name+'.Events');
|
310 |
|
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{$ENDIF}
|
311 |
|
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FEvents := TStringList.Create;
|
312 |
|
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FreeOnTerminate := true;
|
313 |
|
|
Resume
|
314 |
|
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end;
|
315 |
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|
316 |
|
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destructor TEventHandler.Destroy;
|
317 |
|
|
begin
|
318 |
|
|
if assigned(FCriticalSection) then FCriticalSection.Free;
|
319 |
|
|
{$IFDEF WINDOWS}
|
320 |
|
|
CloseHandle(FEventHandler);
|
321 |
|
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{$ELSE}
|
322 |
|
|
if assigned(FEventWaiting) then FEventWaiting.Free;
|
323 |
|
|
{$ENDIF}
|
324 |
|
|
if assigned(FEvents) then FEvents.Free;
|
325 |
|
|
inherited Destroy;
|
326 |
|
|
end;
|
327 |
|
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|
328 |
|
|
procedure TEventHandler.Terminate;
|
329 |
|
|
begin
|
330 |
|
|
inherited Terminate;
|
331 |
|
|
{$IFDEF WINDOWS}
|
332 |
|
|
SetEvent(FEventHandler);
|
333 |
|
|
{$ELSE}
|
334 |
|
|
FEventWaiting.SetEvent;
|
335 |
|
|
{$ENDIF}
|
336 |
|
|
CancelEvents;
|
337 |
|
|
end;
|
338 |
|
|
|
339 |
|
|
procedure TEventHandler.RegisterEvents(Events: TStrings);
|
340 |
|
|
var
|
341 |
|
|
i: integer;
|
342 |
|
|
EventNames: array of PChar;
|
343 |
|
|
begin
|
344 |
|
|
UnregisterEvents;
|
345 |
|
|
|
346 |
|
|
if Events.Count = 0 then
|
347 |
|
|
exit;
|
348 |
|
|
|
349 |
|
|
setlength(EventNames,MaxEvents);
|
350 |
|
|
try
|
351 |
|
|
for i := 0 to Events.Count-1 do
|
352 |
|
|
EventNames[i] := PChar(Events[i]);
|
353 |
|
|
FEvents.Assign(Events);
|
354 |
|
|
FEventBufferlen := isc_event_block(@FEventBuffer,@FResultBuffer,
|
355 |
|
|
Events.Count,
|
356 |
|
|
EventNames[0],EventNames[1],EventNames[2],
|
357 |
|
|
EventNames[3],EventNames[4],EventNames[5],
|
358 |
|
|
EventNames[6],EventNames[7],EventNames[8],
|
359 |
|
|
EventNames[9],EventNames[10],EventNames[11],
|
360 |
|
|
EventNames[12],EventNames[13],EventNames[14]
|
361 |
|
|
);
|
362 |
|
|
FState := stHasEvb;
|
363 |
|
|
FRegisteredState := true;
|
364 |
|
|
QueueEvents
|
365 |
|
|
finally
|
366 |
|
|
SetLength(EventNames,0)
|
367 |
|
|
end;
|
368 |
|
|
end;
|
369 |
|
|
|
370 |
|
|
procedure TEventHandler.UnregisterEvents;
|
371 |
|
|
begin
|
372 |
|
|
if FRegisteredState then
|
373 |
|
|
begin
|
374 |
|
|
CancelEvents;
|
375 |
|
|
FRegisteredState := false;
|
376 |
|
|
end;
|
377 |
|
|
end;
|
378 |
|
|
|
379 |
|
|
{ TIBEvents }
|
380 |
|
|
|
381 |
|
|
procedure TIBEvents.ValidateDatabase( Database: TIBDatabase);
|
382 |
|
|
begin
|
383 |
|
|
if not assigned( Database) then
|
384 |
|
|
IBError(ibxeDatabaseNameMissing, [nil]);
|
385 |
|
|
if not Database.Connected then
|
386 |
|
|
IBError(ibxeDatabaseClosed, [nil]);
|
387 |
|
|
end;
|
388 |
|
|
|
389 |
tony |
1 |
constructor TIBEvents.Create( AOwner: TComponent);
|
390 |
|
|
begin
|
391 |
|
|
inherited Create( AOwner);
|
392 |
|
|
FIBLoaded := False;
|
393 |
|
|
CheckIBLoaded;
|
394 |
|
|
FIBLoaded := True;
|
395 |
tony |
7 |
FBase := TIBBase.Create(Self);
|
396 |
|
|
FBase.BeforeDatabaseDisconnect := DoBeforeDatabaseDisconnect;
|
397 |
|
|
FBase.AfterDatabaseConnect := DoAfterDatabaseConnect;
|
398 |
tony |
1 |
FEvents := TStringList.Create;
|
399 |
|
|
with TStringList( FEvents) do
|
400 |
|
|
begin
|
401 |
|
|
OnChange := EventChange;
|
402 |
|
|
Duplicates := dupIgnore;
|
403 |
|
|
end;
|
404 |
tony |
7 |
FEventHandler := TEventHandler.Create(self)
|
405 |
tony |
1 |
end;
|
406 |
|
|
|
407 |
|
|
destructor TIBEvents.Destroy;
|
408 |
|
|
begin
|
409 |
|
|
if FIBLoaded then
|
410 |
|
|
begin
|
411 |
|
|
UnregisterEvents;
|
412 |
tony |
7 |
SetDatabase(nil);
|
413 |
tony |
1 |
TStringList(FEvents).OnChange := nil;
|
414 |
tony |
7 |
FBase.Free;
|
415 |
tony |
1 |
FEvents.Free;
|
416 |
|
|
end;
|
417 |
tony |
7 |
if assigned(FEventHandler) then
|
418 |
|
|
TEventHandler(FEventHandler).Terminate;
|
419 |
|
|
FEventHandler := nil;
|
420 |
tony |
1 |
inherited Destroy;
|
421 |
|
|
end;
|
422 |
|
|
|
423 |
|
|
|
424 |
|
|
|
425 |
|
|
procedure TIBEvents.EventChange( sender: TObject);
|
426 |
|
|
begin
|
427 |
|
|
{ check for blank event }
|
428 |
|
|
if TStringList(Events).IndexOf( '') <> -1 then
|
429 |
|
|
IBError(ibxeInvalidEvent, [nil]);
|
430 |
|
|
{ check for too many events }
|
431 |
|
|
if Events.Count > MaxEvents then
|
432 |
|
|
begin
|
433 |
|
|
TStringList(Events).OnChange := nil;
|
434 |
|
|
Events.Delete( MaxEvents);
|
435 |
|
|
TStringList(Events).OnChange := EventChange;
|
436 |
|
|
IBError(ibxeMaximumEvents, [nil]);
|
437 |
|
|
end;
|
438 |
tony |
7 |
if Registered then
|
439 |
|
|
TEventHandler(FEventHandler).RegisterEvents(Events);
|
440 |
tony |
1 |
end;
|
441 |
|
|
|
442 |
|
|
procedure TIBEvents.Notification( AComponent: TComponent;
|
443 |
|
|
Operation: TOperation);
|
444 |
|
|
begin
|
445 |
|
|
inherited Notification( AComponent, Operation);
|
446 |
tony |
7 |
if (Operation = opRemove) and (AComponent = FBase.Database) then
|
447 |
tony |
1 |
begin
|
448 |
|
|
UnregisterEvents;
|
449 |
tony |
7 |
FBase.Database := nil;
|
450 |
tony |
1 |
end;
|
451 |
|
|
end;
|
452 |
|
|
|
453 |
|
|
procedure TIBEvents.RegisterEvents;
|
454 |
|
|
begin
|
455 |
|
|
ValidateDatabase( Database);
|
456 |
|
|
if csDesigning in ComponentState then FRegistered := true
|
457 |
tony |
7 |
else
|
458 |
|
|
begin
|
459 |
|
|
if not FBase.Database.Connected then
|
460 |
|
|
FDeferredRegister := true
|
461 |
|
|
else
|
462 |
|
|
begin
|
463 |
|
|
TEventHandler(FEventHandler).RegisterEvents(Events);
|
464 |
|
|
FRegistered := true;
|
465 |
|
|
end;
|
466 |
tony |
1 |
end;
|
467 |
|
|
end;
|
468 |
|
|
|
469 |
|
|
procedure TIBEvents.SetEvents( value: TStrings);
|
470 |
|
|
begin
|
471 |
|
|
FEvents.Assign( value);
|
472 |
|
|
end;
|
473 |
|
|
|
474 |
|
|
procedure TIBEvents.SetDatabase( value: TIBDatabase);
|
475 |
|
|
begin
|
476 |
tony |
7 |
if value <> FBase.Database then
|
477 |
tony |
1 |
begin
|
478 |
tony |
7 |
if Registered then UnregisterEvents;
|
479 |
tony |
1 |
if assigned( value) and value.Connected then ValidateDatabase( value);
|
480 |
tony |
7 |
FBase.Database := value;
|
481 |
|
|
if (FBase.Database <> nil) and FBase.Database.Connected then
|
482 |
|
|
DoAfterDatabaseConnect(FBase.Database)
|
483 |
tony |
1 |
end;
|
484 |
|
|
end;
|
485 |
|
|
|
486 |
tony |
7 |
function TIBEvents.GetDatabase: TIBDatabase;
|
487 |
|
|
begin
|
488 |
|
|
Result := FBase.Database
|
489 |
|
|
end;
|
490 |
|
|
|
491 |
tony |
1 |
procedure TIBEvents.SetRegistered( value: Boolean);
|
492 |
|
|
begin
|
493 |
tony |
7 |
FDeferredRegister := false;
|
494 |
|
|
if not assigned(FBase) or (FBase.Database = nil) then
|
495 |
|
|
begin
|
496 |
|
|
FDeferredRegister := value;
|
497 |
|
|
Exit;
|
498 |
|
|
end;
|
499 |
|
|
|
500 |
|
|
if value then RegisterEvents else UnregisterEvents;
|
501 |
tony |
1 |
end;
|
502 |
|
|
|
503 |
|
|
procedure TIBEvents.UnregisterEvents;
|
504 |
|
|
begin
|
505 |
tony |
7 |
FDeferredRegister := false;
|
506 |
|
|
if not FRegistered then
|
507 |
|
|
Exit;
|
508 |
tony |
1 |
if csDesigning in ComponentState then
|
509 |
|
|
FRegistered := false
|
510 |
tony |
7 |
else
|
511 |
tony |
1 |
begin
|
512 |
tony |
7 |
TEventHandler(FEventHandler).UnRegisterEvents;
|
513 |
tony |
1 |
FRegistered := false;
|
514 |
|
|
end;
|
515 |
|
|
end;
|
516 |
|
|
|
517 |
tony |
7 |
procedure TIBEvents.DoBeforeDatabaseDisconnect(Sender: TObject);
|
518 |
tony |
1 |
begin
|
519 |
tony |
7 |
UnregisterEvents;
|
520 |
tony |
1 |
end;
|
521 |
|
|
|
522 |
tony |
7 |
procedure TIBEvents.DoAfterDatabaseConnect(Sender: TObject);
|
523 |
|
|
begin
|
524 |
|
|
if FDeferredRegister then
|
525 |
|
|
Registered := true
|
526 |
|
|
end;
|
527 |
|
|
|
528 |
|
|
function TIBEvents.GetDatabaseHandle: TISC_DB_HANDLE;
|
529 |
|
|
begin
|
530 |
|
|
ValidateDatabase(FBase.Database);
|
531 |
|
|
Result := FBase.Database.Handle;
|
532 |
|
|
end;
|
533 |
|
|
|
534 |
|
|
|
535 |
tony |
1 |
end.
|