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(* |
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* Firebird Interface (fbintf). The fbintf components provide a set of |
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* Pascal language bindings for the Firebird API. Although predominantly |
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* a new development they include source code taken from IBX and may be |
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* considered a derived product. This software thus also includes the copyright |
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* notice and license conditions from IBX. |
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* |
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* Except for those parts dervied from IBX, contents of this file are subject |
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* to the Initial Developer's Public License Version 1.0 (the "License"); you |
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* may not use this file except in compliance with the License. You may obtain a |
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* copy of the License here: |
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* |
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* http://www.firebirdsql.org/index.php?op=doc&id=idpl |
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* |
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* Software distributed under the License is distributed on an "AS |
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or |
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* implied. See the License for the specific language governing rights |
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* and limitations under the License. |
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* |
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* The Initial Developer of the Original Code is Tony Whyman. |
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* |
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* The Original Code is (C) 2016 Tony Whyman, MWA Software |
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* (http://www.mwasoftware.co.uk). |
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* |
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* All Rights Reserved. |
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* |
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* Contributor(s): ______________________________________. |
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* |
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*) |
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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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{ 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 - 2015 } |
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{ } |
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{************************************************************************} |
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unit FBEvents; |
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{$IFDEF MSWINDOWS} |
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{$DEFINE WINDOWS} |
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{$ENDIF} |
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|
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{$IFDEF FPC} |
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{$mode delphi} |
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{$interfaces COM} |
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{$ENDIF} |
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|
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interface |
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|
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uses |
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Classes, SysUtils, IB, FBClientAPI, syncobjs, FBActivityMonitor; |
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|
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type |
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|
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{ TFBEvents } |
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|
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TFBEvents = class(TActivityReporter) |
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private |
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FEvents: TStringList; |
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FAttachment: IAttachment; |
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FEventCounts: TEventCounts; |
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protected |
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FEventBuffer: PByte; |
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FEventBufferLen: integer; |
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FResultBuffer: PByte; |
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FEventHandler: TEventHandler; |
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FCriticalSection: TCriticalSection; |
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FInWaitState: boolean; |
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procedure CreateEventBlock; |
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procedure CancelEvents(Force: boolean = false); virtual; |
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procedure EventSignaled; |
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function GetIEvents: IEvents; virtual; abstract; |
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procedure ProcessEventCounts; |
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public |
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constructor Create(DBAttachment: IAttachment; aMonitor: IActivityMonitor; Events: TStrings); |
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destructor Destroy; override; |
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|
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{IEvents} |
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procedure GetEvents(EventNames: TStrings); |
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procedure SetEvents(EventNames: TStrings); overload; |
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procedure SetEvents(Event: AnsiString); overload; |
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procedure Cancel; |
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function ExtractEventCounts: TEventCounts; |
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function GetAttachment: IAttachment; |
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procedure AsyncWaitForEvent(EventHandler: TEventHandler); virtual; abstract; |
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end; |
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|
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|
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implementation |
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|
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uses FBMessages, IBExternals; |
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|
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const |
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MaxEvents = 15; |
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|
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{ TFBEvents } |
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|
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procedure TFBEvents.CreateEventBlock; |
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var |
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i: integer; |
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EventNames: array of PAnsiChar; |
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EventName: AnsiString; |
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begin |
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with FirebirdClientAPI do |
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begin |
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if FEventBuffer <> nil then |
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isc_free( FEventBuffer); |
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FEventBuffer := nil; |
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if FResultBuffer <> nil then |
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isc_free( FResultBuffer); |
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FResultBuffer := nil; |
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|
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setlength(EventNames,MaxEvents); |
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try |
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for i := 0 to FEvents.Count-1 do |
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begin |
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EventName := FEvents[i]; |
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EventNames[i] := PAnsiChar(EventName); |
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end; |
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|
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FEventBufferlen := isc_event_block(@FEventBuffer,@FResultBuffer, |
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FEvents.Count, |
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EventNames[0],EventNames[1],EventNames[2], |
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EventNames[3],EventNames[4],EventNames[5], |
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EventNames[6],EventNames[7],EventNames[8], |
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EventNames[9],EventNames[10],EventNames[11], |
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EventNames[12],EventNames[13],EventNames[14] |
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); |
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finally |
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SetLength(EventNames,0) |
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end; |
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end; |
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end; |
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|
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procedure TFBEvents.CancelEvents(Force: boolean); |
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begin |
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FEventHandler := nil; |
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end; |
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|
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procedure TFBEvents.EventSignaled; |
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var Handler: TEventHandler; |
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begin |
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Handler := nil; |
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FCriticalSection.Enter; |
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try |
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if not FInWaitState then Exit; |
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FInWaitState := false; |
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ProcessEventCounts; |
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if assigned(FEventHandler) then |
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begin |
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Handler := FEventHandler; |
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FEventHandler := nil; |
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end; |
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finally |
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FCriticalSection.Leave; |
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end; |
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if assigned(Handler) then |
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Handler(GetIEvents); |
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end; |
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|
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procedure TFBEvents.ProcessEventCounts; |
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var P: PISC_LONG; |
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EventCountList: array[0..19] of ISC_LONG; |
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i: integer; |
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j: integer; |
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begin |
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SetLength(FEventCounts,0); |
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if FResultBuffer = nil then Exit; |
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|
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FillChar(EventCountList,sizeof(EventCountList),0); |
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|
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with FirebirdClientAPI do |
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isc_event_counts( @EventCountList, FEventBufferLen, FEventBuffer, FResultBuffer); |
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j := 0; |
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P := @EventCountList; |
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for i := 0 to FEvents.Count - 1 do |
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begin |
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if EventCountList[i] <> 0 then |
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begin |
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Inc(j); |
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SetLength(FEventCounts,j); |
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FEventCounts[j-1].EventName := FEvents[i]; |
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FEventCounts[j-1].Count := P^; |
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Inc(P); |
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// writeln('Event: ',FEventCounts[j-1].EventName,' Count = ',FEventCounts[j-1].Count); |
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end; |
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end; |
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end; |
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|
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constructor TFBEvents.Create(DBAttachment: IAttachment; |
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aMonitor: IActivityMonitor; Events: TStrings); |
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begin |
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inherited Create(aMonitor); |
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FAttachment := DBAttachment; |
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if Events.Count > MaxEvents then |
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IBError(ibxeMaximumEvents, [nil]); |
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|
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FCriticalSection := TCriticalSection.Create; |
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FEvents := TStringList.Create; |
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FEvents.Assign(Events); |
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CreateEventBlock; |
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end; |
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|
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destructor TFBEvents.Destroy; |
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begin |
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if assigned(FCriticalSection) then FCriticalSection.Free; |
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if assigned(FEvents) then FEvents.Free; |
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with FirebirdClientAPI do |
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begin |
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if FEventBuffer <> nil then |
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isc_free( FEventBuffer); |
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if FResultBuffer <> nil then |
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isc_free( FResultBuffer); |
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end; |
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inherited Destroy; |
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end; |
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|
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procedure TFBEvents.GetEvents(EventNames: TStrings); |
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begin |
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EventNames.Assign(FEvents) |
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end; |
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|
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procedure TFBEvents.SetEvents(EventNames: TStrings); |
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begin |
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if (EventNames.Count > 0) and not IsMultiThread then |
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IBError(ibxMultiThreadRequired,['Firebird Events Handling']); |
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if EventNames.Text <> FEvents.Text then |
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begin |
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Cancel; |
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FEvents.Assign(EventNames); |
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CreateEventBlock; |
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end; |
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end; |
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|
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procedure TFBEvents.SetEvents(Event: AnsiString); |
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var S: TStringList; |
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begin |
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S := TStringList.Create; |
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try |
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S.Add(Event); |
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SetEvents(S); |
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finally |
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S.Free; |
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end; |
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end; |
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|
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procedure TFBEvents.Cancel; |
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begin |
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if assigned(FEventHandler) then |
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CancelEvents; |
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end; |
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|
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function TFBEvents.ExtractEventCounts: TEventCounts; |
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begin |
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Result := FEventCounts; |
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end; |
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|
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function TFBEvents.GetAttachment: IAttachment; |
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begin |
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Result := FAttachment; |
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end; |
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|
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end. |
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|
