/// <summary>
/// The function called at every timer interval. It checks the backgroundworker isbusy
/// state. If not busy then it stops the timer and starts the backgroundworker with the
/// saved latest argument. The saved argument is also nulled since that aspect is used
/// as a flag. Otherwise the timer is allowed to remain running.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void CheckBackgroundWorkerStateTimer_Elapsed(object sender, ElapsedEventArgs e)
{
if (bwTableSolutions.IsBusy)
{
return;
}
timerRetryUntilNotBusy.Stop();
bwTableSolutions.RunWorkerAsync(m_Argument);
m_Argument = null;
return;
}
private void RunBackgroundWorkerTableSolutions(double cfm, double lph, double surfe, bool colebrook, bool limitvelocity, double vellimit)
{
TableSolutionArgs thisTableSol = new TableSolutionArgs {
Cfm = cfm,
Lph = lph,
Surfe = surfe,
Colebrook = colebrook,
Limitvelocity = limitvelocity,
Vellimit = vellimit,
MaxAr = sessionModel.MaxAR,
DLiner = sessionModel.Dliner,
LphMargin = sessionModel.LphMargin,
Dtype = sessionModel.Dtype,
ChkHRange = sessionModel.ChkHRange,
HtLL = sessionModel.HtLL,
HtUL = sessionModel.HtUL,
ChkWRange = sessionModel.ChkWRange,
WtLL = sessionModel.WtLL,
WtUL = sessionModel.WtUL
};
// If not null then there is an argument pending. Throw it out and
// replace it with a new argument pending. This serves as both a flag
// here and a way to save the most current argument for the waiting
// backgroundworker state checker.
if (m_Argument != null)
{
m_Argument = thisTableSol;
return;
}
// Check if backgroundworker is not busy.
// Run the not busy backgroundworker with the current argument.
if (!bwTableSolutions.IsBusy)
{
string solTypeText = StrSoluT();
sessionModel.Ductshapevis = Visibility.Hidden;
sessionModel.SolutionsMsg = "Calculating " + solTypeText + " Solutions .......";
bwTableSolutions.RunWorkerAsync(thisTableSol);
return;
}
// If here then backgroundworker is currently busy. Save this current desired
// argument and then issue a request to cancel the backgroundworker.
// Then start the backgroundworker state checker timer.
m_Argument = thisTableSol;
bwTableSolutions.CancelAsync();
sessionModel.SolutionsMsg = "Calculation cancel is pending .....";
timerRetryUntilNotBusy.Enabled = true;
timerRetryUntilNotBusy.Start();
// The request to cancel has been issued and the state checker timer has been
// activated. UI returns to user but the revised table has yet to be calculated.
// The state checker will start the backgroundworker with the saved argument when
// it sees the backgroundworker not busy.
return;
}
private void BwTableSolutions_DoWork(object sender, DoWorkEventArgs e)
{
BackgroundWorker worker = sender as BackgroundWorker;
TableSolutionArgs TSA = e.Argument as TableSolutionArgs;
double cfm = TSA.Cfm;
double lph = TSA.Lph;
double surfe = TSA.Surfe;
bool colebrook = TSA.Colebrook;
bool limitvelocity = TSA.Limitvelocity;
double vellimit = TSA.Vellimit;
double maxAr = TSA.MaxAr;
double dLiner = TSA.DLiner;
double lphMargin = TSA.LphMargin;
int dtype = TSA.Dtype;
bool chkHRange = TSA.ChkHRange;
double htLL = TSA.HtLL;
double htUL = TSA.HtUL;
bool chkWRange = TSA.ChkWRange;
double wtLL = TSA.WtLL;
double wtUL = TSA.WtUL;
DataTable argSolTable = new SolutionsTable();// TSA.SolutTable;
double _tryLPH = 0;
double _rEqCirDct = 0;
int _maxDuct = 0;
int _maxDuctH = 0;
int _maxDuctW = 0;
double _area_sf = 0;
string _typ = null;
double _dVel = 0;
double _HtBot = 0;
double _WtBot = 0;
double smallNumber = 5E-3;
_maxDuct = Convert.ToInt32(Math.Truncate((maxAr - 1) * ReqEqvCirDuct(cfm, lph, surfe, colebrook, limitvelocity, vellimit)));
_maxDuct = Convert.ToInt32(Math.Max(_maxDuct, 6));
// limit lower size
_maxDuctH = _maxDuct;
_maxDuctW = _maxDuct;
_HtBot = 6;
_WtBot = 6;
if (chkHRange)
{
_HtBot = htLL;
_maxDuctH = Convert.ToInt32(htUL);
}
if (chkWRange)
{
_WtBot = wtLL;
_maxDuctW = Convert.ToInt32(wtUL);
}
_typ = (dtype == 0 ? " R" : " FO");
double DDLiner = 2 * dLiner;
for (double ductHeight = _HtBot; ductHeight <= _maxDuctH; ductHeight += Dinc)
{
if ((worker.CancellationPending))
{
e.Cancel = true;
return;
}
if (argSolTable.Rows.Count > 60)
{
break;
}
// Not adjusting the inner loop lower bound to eliminate mirror duplicates!! The
// problem with that approach is that the lower and upper dimension limits can
// vary.
for (double wt = _WtBot; wt <= _maxDuctW; wt += Dinc)
{
if ((worker.CancellationPending))
{
e.Cancel = true;
return;
}
// check ar and even size first
if ((Math.Max(wt, ductHeight) / Math.Min(wt, ductHeight) <= maxAr) && ((wt + DDLiner) % 2 == 0) && ((ductHeight + DDLiner) % 2 == 0))
{
_rEqCirDct = DhEqCircRO(ductHeight, wt, dtype);
_tryLPH = CircDuctPLPH(cfm, _rEqCirDct, surfe, colebrook);
// The viable solution must first come under the lph criterium. Then
// it must be close enough to the lph according to the allowed margin factor.
if ((_tryLPH <= lph) && ((lphMargin * lph) - _tryLPH <= smallNumber))
{
_area_sf = DAreaRO(wt, ductHeight, dtype);
_dVel = Vel(cfm, _area_sf);
// velocity limit check, if fails then skip this for
if ((limitvelocity) && (_dVel > vellimit))
{
continue;
}
double drWt = wt + DDLiner;
double drHt = ductHeight + DDLiner;
double drPFT = DuctPFT(drWt, drHt, dtype);
DataRow dr = argSolTable.NewRow();
// inlist check, if already in list as reverse size then skip this solution
if (InList(drHt, drWt, argSolTable))
{
continue;
}
dr[0] = drWt;
dr[1] = "x";
dr[2] = drHt;
dr[3] = _typ;
dr[4] = Math.Round(_tryLPH, 3, MidpointRounding.AwayFromZero).ToString();
dr[5] = _dVel.ToString("#,##0");
dr[6] = Math.Round((Math.Max(wt, ductHeight) / Math.Min(wt, ductHeight)), 2, MidpointRounding.AwayFromZero).ToString("0.00");
dr[7] = drPFT.ToString("0.00");
argSolTable.Rows.Add(dr);
}
}
if (argSolTable.Rows.Count > 60)
{
break;
}
}
}
// sort by aspect ratio first, then by pressure loss
// This puts the most efficient section at the list top.
// sessionModel.SolTable.DefaultView.Sort = "PFT ASC, AR ASC, PLPH DESC";
argSolTable.DefaultView.Sort = "AR ASC, PLPH ASC";
// Backgroundworker return value
e.Result = argSolTable;
}