public decimal GetCurrentDebt(string creditorId, string debtorId)
{
DebtRow debt = this.rdbc.CurrentDebts
.Where(cd => cd.CreditorId == creditorId &&
cd.DebtorId == debtorId).FirstOrDefault();
return(debt?.DebtTotal ?? 0);
}
protected virtual void OnDebtDealReceived(
object o_debtDealsRegister, DebtDealReceivedEventData evData
)
{
/*
* *** Notes on parallel execution ***
*
* Similar to DebtDealsRegister Add method,
* consider only these cases:
*
* two unique involved id-s:
* * same giver, same taker
* * D1.giver = D2.taker, D1.taker = D2.giver
*
* Need to consider parallel changes of the same debt
* in CurrentDebts table.
*
* Result - serialize always when
* two deals have only two unique involved id-s.
*/
DebtDealRow deal = evData.Deal;
DebtRow initialGiverDebtToTaker
= this.dbc.CurrentDebts.Where(cd =>
cd.CreditorId == deal.TakerId &&
cd.DebtorId == deal.GiverId).FirstOrDefault();
if (initialGiverDebtToTaker == null)
{
initialGiverDebtToTaker = new DebtRow {
CreditorId = deal.TakerId, DebtorId = deal.GiverId
}
}
;
DebtRow initialTakerDebtToGiver
= this.dbc.CurrentDebts.Where(cd =>
cd.CreditorId == deal.GiverId &&
cd.DebtorId == deal.TakerId).FirstOrDefault();
if (initialTakerDebtToGiver == null)
{
initialTakerDebtToGiver = new DebtRow {
CreditorId = deal.GiverId, DebtorId = deal.TakerId
}
}
;
DebtRow debtToChange;
if (evData.Analysis.IsPayback)
{
debtToChange = initialGiverDebtToTaker;
}
else
{
debtToChange = initialTakerDebtToGiver;
}
decimal initialDebtAmount = debtToChange?.DebtTotal ?? 0m;
decimal resultingDebtAmount;
if (evData.Analysis.IsPayback)
{
resultingDebtAmount = Math.Max(0m,
initialDebtAmount - deal.Amount);
}
else
{
resultingDebtAmount = initialDebtAmount + deal.Amount;
}
debtToChange.DebtTotal = resultingDebtAmount;
if (resultingDebtAmount > DebtConstants.MaxZeroEquivalent)
{
if (this.dbc.CurrentDebts.Count(cd =>
cd.CreditorId == debtToChange.CreditorId &&
cd.DebtorId == debtToChange.DebtorId
)
== 0
)
{
this.dbc.CurrentDebts.Add(debtToChange);
}
}
else
{
this.dbc.CurrentDebts.Remove(debtToChange);
}
this.dbc.SaveChanges();
}