protected virtual void OnDebtDealReceived(
object o_debtDealsRegister, DebtDealReceivedEventData evData
)
{
this.UpdateTotalsPerPerson(evData);
this.UpdateStatisticsPerPerson(evData);
}
private void SetIdsOfPeopleWhoCreditedMaxHistoricalTotal(
AchieversDoc achieversDoc,
DebtDealReceivedEventData evData
)
{
HashSet <string> previousIds = this.currentAchieversDoc
.HistoricallyCreditedMaxTotalPersonIds;
var result = new HashSet <string>(1 + previousIds?.Count ?? 0);
decimal initialMax = 0;
if (previousIds != null && previousIds.Count > 0)
{
initialMax = GetDbTotalForPerson(previousIds.First());
}
if (evData.Analysis.IsPayback == false)
{
decimal newGiverTotal
= GetDbTotalForPerson(evData.Deal.GiverId);
if (newGiverTotal > initialMax &&
newGiverTotal > DebtConstants.MaxZeroEquivalent
)
{
result.Add(evData.Deal.GiverId);
}
else
if (Math.Abs(newGiverTotal - initialMax)
<= DebtConstants.ValueRelativeError * initialMax
&&
initialMax > DebtConstants.MaxZeroEquivalent
)
{
if (previousIds != null)
{
result.UnionWith(previousIds);
}
result.Add(evData.Deal.GiverId);
}
}
if (result.Count == 0 && previousIds != null)
{
result.UnionWith(previousIds);
}
achieversDoc.HistoricallyCreditedMaxTotalPersonIds
= result.Count > 0 ? result : null;
decimal GetDbTotalForPerson(string personId)
{
return(this.dbc.CurrentTotalsPerPerson
.Where(ct => ct.PersonId == personId)
.Select(ct => ct.HistoricallyCreditedInTotal)
.FirstOrDefault());
}
}
private void UpdateStatisticsPerPerson(
DebtDealReceivedEventData evData
)
{
if (evData.Analysis.IsPayback)
{
return;
}
/*
* *** Notes on parallel execution ***
*
* Need to consider:
* * parallel changes of:
* + takerStatistics from CurrentStatisticsPerPerson table
* + takerTotals from CurrentTotalsPerPerson table
*
* Result - serialize for operations with the same takerId in:
* + CurrentStatisticsPerPerson table
* + CurrentTotalsPerPerson table
*/
string takerId = evData.Deal.TakerId;
PersonTotalsRow takerTotals
= this.rdbc.CurrentTotalsPerPerson
.Where(ct => ct.PersonId == takerId)
.FirstOrDefault()
?? new PersonTotalsRow();
PersonStatisticsRow takerStatistics
= this.dbc.CurrentStatisticsPerPerson
.Where(s => s.PersonId == takerId)
.FirstOrDefault()
?? new PersonStatisticsRow();
takerStatistics.PersonId = takerId;
takerStatistics.HistoricalDebtAverageThroughCasesOfTaking
= takerTotals.HistoricallyOwedInTotal
/ takerTotals.HistoricalCountOfCreditsTaken;
if (this.dbc.CurrentStatisticsPerPerson
.Count(s => s.PersonId == takerId) == 0
)
{
this.dbc.CurrentStatisticsPerPerson.Add(takerStatistics);
}
this.dbc.SaveChanges();
}
protected virtual void OnDebtDealReceived(
object o_debtDealsRegister, DebtDealReceivedEventData evData
)
{
var newDoc = new AchieversDoc()
{
Id = ObjectId.GenerateNewId()
};
this.SetIdsOfPeopleWithMaxTotalDueDebts(newDoc, evData);
this.SetIdsOfPeopleWhoCreditedMaxHistoricalTotal(newDoc, evData);
this.SetIdsOfBestDebtorsByRepaidFractionThenTotal(newDoc, evData);
if (this.IsDocumentContentDifferent(newDoc, this.currentAchieversDoc))
{
this.SaveDocumentInDB(newDoc);
PeopleStatisticsDocumentRow achieversDocRow
= this.dbc.CurrentPeopleStatisticsDocuments
.Where(sd => sd.DocumentName == AchieversDoc.Name)
.FirstOrDefault();
bool shouldAddNewRow = false;
if (achieversDocRow == null)
{
shouldAddNewRow = true;
achieversDocRow = new PeopleStatisticsDocumentRow();
}
achieversDocRow.DocumentName = AchieversDoc.Name;
achieversDocRow.DocumentId = newDoc.Id.ToString();
if (shouldAddNewRow)
{
this.dbc.CurrentPeopleStatisticsDocuments
.Add(achieversDocRow);
}
this.dbc.SaveChanges();
this.currentAchieversDoc = newDoc;
}
// keep execution serialized until DebtDealAdded event is handled.
}
/// <summary>
///
/// </summary>
/// <param name="evData"></param>
/// <returns>new taker totals</returns>
private void UpdateTotalsPerPerson(DebtDealReceivedEventData evData)
{
/*
* *** Notes on parallel execution ***
*
* Need to consider:
* * parallel changes of the same
* giverTotals and takerTotals red from
* CurrentTotalsPerPerson table.
*
* * parallel attempts to add new totals
* for the same giver or taker.
*
* Result - serialize for operations in CurrentTotalsPerPerson
* table with the same giverId or takerId.
*/
DebtDealRow deal = evData.Deal;
PersonTotalsRow giverTotals
= this.dbc.CurrentTotalsPerPerson
.Where(ct => ct.PersonId == deal.GiverId)
.FirstOrDefault()
?? new PersonTotalsRow();
giverTotals.PersonId = deal.GiverId;
PersonTotalsRow takerTotals
= this.dbc.CurrentTotalsPerPerson
.Where(ct => ct.PersonId == deal.TakerId)
.FirstOrDefault()
?? new PersonTotalsRow();
takerTotals.PersonId = deal.TakerId;
if (evData.Analysis.IsPayback)
{
giverTotals.DueDebtsTotal = Math.Max(
0, giverTotals.DueDebtsTotal - deal.Amount);
}
else
{
giverTotals.HistoricallyCreditedInTotal += deal.Amount;
takerTotals.DueDebtsTotal += deal.Amount;
takerTotals.HistoricallyOwedInTotal += deal.Amount;
takerTotals.HistoricalCountOfCreditsTaken++;
}
if (this.dbc.CurrentTotalsPerPerson
.Count(ct => ct.PersonId == deal.GiverId) == 0
)
{
this.dbc.CurrentTotalsPerPerson.Add(giverTotals);
}
if (this.dbc.CurrentTotalsPerPerson
.Count(ct => ct.PersonId == deal.TakerId) == 0
)
{
this.dbc.CurrentTotalsPerPerson.Add(takerTotals);
}
this.dbc.SaveChanges();
}
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();
}
private void SetIdsOfBestDebtorsByRepaidFractionThenTotal(
AchieversDoc achieversDoc,
DebtDealReceivedEventData evData
)
{
if (evData.Analysis.IsPayback != true)
{
return;
}
var previousIds = this.currentAchieversDoc
.BestDebtorIdsByRepaidFractionThenTotal;
var potentialBestDebtors = new HashSet <string>(
1 + previousIds?.Count ?? 0)
{
evData.Deal.GiverId
};
if (previousIds != null)
{
potentialBestDebtors.UnionWith(previousIds);
}
HashSet <string> result = GetBestDebtors(potentialBestDebtors);
achieversDoc.BestDebtorIdsByRepaidFractionThenTotal
= result.Count > 0 ? result : null;
HashSet <string> GetBestDebtors(HashSet <string> input)
{
if (input.Count == 0)
{
return(input);
}
var table
= input.Select(id =>
new {
Id = id,
RepaidFraction
= this.personDebtsRegister
.GetRepaidFraction(id),
HistoricallyOwedInTotal
= this.personDebtsRegister
.GetTotals(id).HistoricallyOwedInTotal
})
.OrderByDescending(r => r.RepaidFraction ?? 0)
.ThenByDescending(r => r.HistoricallyOwedInTotal);
var firstBestRow = table.First();
decimal bestRFValue = firstBestRow.RepaidFraction.Value;
decimal maxTotal = firstBestRow.HistoricallyOwedInTotal;
if (bestRFValue <= DebtConstants.ValueRelativeError ||
maxTotal <= DebtConstants.MaxZeroEquivalent
)
{
return(new HashSet <string>(0));
}
return(table
.Where(r =>
r.RepaidFraction == bestRFValue &&
r.HistoricallyOwedInTotal == maxTotal)
.Select(r => r.Id).ToHashSet());
}
}
private void SetIdsOfPeopleWithMaxTotalDueDebts(
AchieversDoc achieversDoc,
DebtDealReceivedEventData evData
)
{
HashSet <string> previousIds
= this.currentAchieversDoc.MaxDueDebtsTotalPersonIds;
var result = new HashSet <string>(1 + previousIds?.Count ?? 0);
decimal initialMax = 0;
if (previousIds != null && previousIds.Count > 0)
{
initialMax = GetDbDueDebtsTotalForPerson(previousIds.First());
}
if (evData.Analysis.IsPayback == false)
{
decimal newTakerDebtsTotal
= GetDbDueDebtsTotalForPerson(evData.Deal.TakerId);
if (newTakerDebtsTotal > initialMax &&
newTakerDebtsTotal > DebtConstants.MaxZeroEquivalent
)
{
result.Add(evData.Deal.TakerId);
}
else
if (Math.Abs(newTakerDebtsTotal - initialMax)
<= DebtConstants.ValueRelativeError * initialMax
&&
initialMax > DebtConstants.MaxZeroEquivalent
)
{
if (previousIds != null)
{
result.UnionWith(previousIds);
}
result.Add(evData.Deal.TakerId);
}
}
else if (previousIds != null &&
previousIds.Count == 1 &&
previousIds.Contains(evData.Deal.GiverId)
)
{
decimal newMaxTotal = 0;
foreach (PersonTotalsRow t in
this.rdbc.CurrentTotalsPerPerson
.OrderByDescending(ct => ct.DueDebtsTotal)
)
{
if (t.DueDebtsTotal <= DebtConstants.MaxZeroEquivalent)
{
break;
}
if (result.Count == 0)
{
result.Add(t.PersonId);
newMaxTotal = t.DueDebtsTotal;
continue;
}
if (t.DueDebtsTotal - newMaxTotal
<= DebtConstants.ValueRelativeError * newMaxTotal
)
{
result.Add(t.PersonId);
}
else
{
break;
}
}
}
achieversDoc.MaxDueDebtsTotalPersonIds
= result.Count > 0 ? result : null;
decimal GetDbDueDebtsTotalForPerson(string personId)
{
return(this.dbc.CurrentTotalsPerPerson
.Where(ct => ct.PersonId == personId)
.Select(ct => ct.DueDebtsTotal)
.FirstOrDefault());
}
}