unit ReducedDeltaService_Impl;

{----------------------------------------------------------------------------}
{ This unit was automatically generated by the RemObjects SDK after reading  }
{ the RODL file associated with this project .                               }
{                                                                            }
{ This is where you are supposed to code the implementation of your objects. }
{----------------------------------------------------------------------------}

{$I Remobjects.inc}

interface

uses
  {vcl:} Classes, SysUtils,
  {RemObjects:} uROXMLIntf, uROClientIntf, uROTypes, uROServer, uROServerIntf, uROSessions,
  {Required:} uRORemoteDataModule,
  {Ancestor Implementation:} DataAbstractService_Impl,
  {Used RODLs:} DataAbstract4_Intf,
  {Generated:} ReducedDeltaLibrary_Intf, uDAClasses, uDADataStreamer,
  uDABin2DataStreamer, uDABusinessProcessor, uDAScriptingProvider, uDADelta, uDAInterfaces;

type
  { TReducedDeltaService }
  TReducedDeltaService = class(TDataAbstractService, IReducedDeltaService)
    Schema: TDASchema;
    DataStreamer: TDABin2DataStreamer;
    BusinessProcessor: TDABusinessProcessor;
    procedure BusinessProcessorBeforeProcessChange(
      Sender: TDABusinessProcessor; aChangeType: TDAChangeType;
      aChange: TDADeltaChange; var ProcessChange: Boolean);
  private
    procedure Log(str: string);
  protected
    { IReducedDeltaService methods }
  end;

implementation

{$R *.dfm}
uses
  {Generated:} ReducedDeltaLibrary_Invk,ReducedDeltaServerData, ReducedDeltaServerMain,
  Variants;

procedure Create_ReducedDeltaService(out anInstance : IUnknown);
begin
  anInstance := TReducedDeltaService.Create(nil);
end;

{ TReducedDeltaService }

procedure TReducedDeltaService.Log(str: string);
begin
  ReducedDeltaServerMainForm.Log(str);
end;

procedure TReducedDeltaService.BusinessProcessorBeforeProcessChange(
  Sender: TDABusinessProcessor; aChangeType: TDAChangeType;
  aChange: TDADeltaChange; var ProcessChange: Boolean);

  function _VarToStr(const aValue: variant): string;
  begin
    if VarIsEmpty(aValue) then Result:='<Empty>' else Result:= VarToStr(aValue);
  end;

  function _CreateStr(const aStr: string; const aLen:integer): string;
  begin
    if Length(aStr) > aLen then
      Result:=Copy(aStr,1,aLen-3)+'...'
    else
      Result:= aStr+ StringOfChar(' ', aLen-Length(aStr));
  end;

const
  TDAChangeTypeStr : array [TDAChangeType] of string = ('Insert','Update','Delete');

var
  i: integer;
begin
  Log('Reduced Delta = '+ BoolToStr(BusinessProcessor.HasReducedDelta,True));
  Log('RecID = '+inttostr(aChange.RecID)+', State = ' + TDAChangeTypeStr[aChangeType]);
  for i:=0 to aChange.Delta.LoggedFieldCount-1 do begin
    case aChangeType of
     ctInsert: Log(_CreateStr(aChange.Delta.LoggedFieldNames[i]+':', 15)+
                   _CreateStr('NEW:'+_VarToStr(aChange.OldValues[i]), 35));
     ctUpdate: Log(_CreateStr(aChange.Delta.LoggedFieldNames[i]+':', 15)+
                   _CreateStr('OLD:'+_VarToStr(aChange.OldValues[i]), 35)+
                   _CreateStr('NEW:'+_VarToStr(aChange.OldValues[i]), 35));
     ctDelete: Log(_CreateStr(aChange.Delta.LoggedFieldNames[i]+':', 15)+
                   _CreateStr('OLD:'+_VarToStr(aChange.OldValues[i]), 35));
     end;
  end;
  Log('');
end;

initialization
  TROClassFactory.Create('ReducedDeltaService', Create_ReducedDeltaService, TReducedDeltaService_Invoker);

finalization

end.