/// <summary>
/// fetch-and-compute loop
/// </summary>
/// <returns></returns>
private bool FindMatchingRecord()
{
bool recordFound = false;
if (!StartPosition.IsZero)
{
GatewayResult result = TaskViews.OpenCursors(Reverse, StartPosition);
if (result.Success)
{
IRecord record;
// Looking for one record only
do
{
record = GetBasicRecord();
if (record != null && RecordComputer.Compute(record, true, false, false).Success)
{
recordFound = true;
break;
}
} while (record != null);
}
TaskViews.CloseMainCursor();
}
return(recordFound);
}
/// <summary>
/// setup main cursor for fetch
/// executed for all types of fetches
/// </summary>
/// <returns></returns>
private GatewayResult SetupMainCursor()
{
GatewayResult gatewayResult;
UpdateViewBoundaries(StartPosition);
gatewayResult = TaskViews.OpenCursors(Reverse, StartPosition);
//move to strategy ????
if (gatewayResult.Success && StartingPositionType == StartingPositionType.AfterStartingRecord &&
PositionCache.ContainsValue(startPosition))
{
IRecord dummyRecord = DataviewSynchronizer.CreateRecord();
gatewayResult = TaskViews.FetchMain(dummyRecord);
}
return(gatewayResult);
}
internal override ReturnResultBase Execute()
{
bool isEmptyDataView = ((DataView)(Task.DataView)).isEmptyDataview();
DataviewSynchronizer.SetupDataview(Reverse);
IRecord origRecord = DataviewSynchronizer.GetCurrentRecord();
TaskViews.ViewMain.IgnorePositionCache = true;
GatewayResult result = TaskViews.OpenCursors(Reverse, new DbPos(true));
if (result.Success)
{
IRecord record;
while ((record = GetBasicRecord()) != null)
{
if (RecordComputer.Compute(record, true, false, false).Success)
{
//execute event OnRecordFetchEvent
onRecordFetch((Record)record);
DataviewSynchronizer.RemoveRecord(record);
}
}
}
TaskViews.CloseMainCursor();
TaskViews.ViewMain.IgnorePositionCache = false;
if (origRecord != null)
{
DataviewSynchronizer.SetCurrentRecord(origRecord != null ? origRecord.getId() : Int32.MinValue);
((DataView)(Task.DataView)).takeFldValsFromCurrRec();
}
((DataView)(Task.DataView)).setEmptyDataview(isEmptyDataView);
return(result);
}