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tony |
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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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tony |
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{$IFDEF MSWINDOWS}
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{$DEFINE WINDOWS}
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{$ENDIF}
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tony |
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{$IFDEF FPC}
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tony |
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{$mode delphi}
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tony |
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{$interfaces COM}
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{$ENDIF}
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interface
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uses
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Classes, SysUtils, IB, FBClientAPI, syncobjs, FBActivityMonitor;
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type
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{ TFBEvents }
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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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tony |
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FEventCounts: TEventCounts;
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tony |
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protected
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tony |
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FEventBuffer: PByte;
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tony |
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FEventBufferLen: integer;
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tony |
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FResultBuffer: PByte;
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tony |
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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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tony |
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procedure ProcessEventCounts;
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tony |
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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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{IEvents}
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procedure GetEvents(EventNames: TStrings);
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procedure SetEvents(EventNames: TStrings); overload;
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tony |
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procedure SetEvents(Event: AnsiString); overload;
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tony |
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procedure Cancel;
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function ExtractEventCounts: TEventCounts;
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function GetAttachment: IAttachment;
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tony |
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procedure AsyncWaitForEvent(EventHandler: TEventHandler); virtual; abstract;
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end;
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implementation
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uses FBMessages, IBExternals;
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const
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MaxEvents = 15;
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{ TFBEvents }
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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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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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tony |
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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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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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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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tony |
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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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tony |
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end;
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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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FillChar(EventCountList,sizeof(EventCountList),0);
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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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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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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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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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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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procedure TFBEvents.SetEvents(EventNames: TStrings);
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begin
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tony |
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if (EventNames.Count > 0) and not IsMultiThread then
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IBError(ibxeMultiThreadRequired,['Firebird Events Handling']);
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tony |
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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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tony |
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procedure TFBEvents.SetEvents(Event: AnsiString);
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tony |
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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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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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function TFBEvents.ExtractEventCounts: TEventCounts;
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begin
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tony |
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Result := FEventCounts;
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tony |
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end;
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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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end.
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