public override void PropagateAssert(IExecutionContext context, IList <Tuple> tuples)
{
var joinedSets = JoinedSets(context, tuples);
var aggregation = new Aggregation();
foreach (var set in joinedSets)
{
var matchingFacts = new List <Fact>();
foreach (var fact in set.Facts)
{
if (MatchesConditions(context, set.Tuple, fact))
{
matchingFacts.Add(fact);
}
}
IAggregator aggregator = CreateAggregator(set.Tuple);
var results = aggregator.Add(set.Tuple, matchingFacts);
aggregation.Add(set.Tuple, results);
}
PropagateAggregation(context, aggregation);
}
public override void PropagateRetract(IExecutionContext context, List <Tuple> tuples)
{
var aggregation = new Aggregation();
using (var counter = PerfCounter.Retract(context, this))
{
foreach (var tuple in tuples)
{
IFactAggregator aggregator = RemoveFactAggregator(context, tuple);
if (aggregator != null)
{
aggregation.Remove(tuple, aggregator.AggregateFacts);
}
}
counter.AddInputs(tuples.Count);
counter.AddOutputs(aggregation.Count);
}
PropagateAggregation(context, aggregation);
}
public override void PropagateRetract(IExecutionContext context, IList <Fact> facts)
{
var joinedSets = JoinedSets(context, facts);
var aggregation = new Aggregation();
foreach (var set in joinedSets)
{
if (set.Facts.Count == 0)
{
continue;
}
var matchingFacts = GetMatchingFacts(context, set);
if (matchingFacts.Count > 0)
{
IFactAggregator aggregator = GetFactAggregator(set.Tuple);
if (aggregator != null)
{
RetractFromAggregate(context, aggregator, aggregation, set.Tuple, set.Facts);
}
}
}
PropagateAggregation(context, aggregation);
}
private void AddAggregationResult(Aggregation aggregation, Tuple tuple, IEnumerable <AggregationResult> results)
{
foreach (var result in results)
{
switch (result.Action)
{
case AggregationAction.Added:
var addedFact = CreateAggregateFact(result.Aggregate);
aggregation.Add(tuple, addedFact);
break;
case AggregationAction.Modified:
var modifiedFact = GetAggregateFact(result.Aggregate, result.Previous);
aggregation.Modify(tuple, modifiedFact);
break;
case AggregationAction.Removed:
var removedFact = RemoveAggregateFact(result.Aggregate);
aggregation.Remove(tuple, removedFact);
break;
}
}
}
private void ResetAggregator(Aggregation aggregation, Tuple tuple, IFactAggregator aggregator)
{
tuple.RemoveState <IFactAggregator>(this);
aggregation.Remove(tuple, aggregator.AggregateFacts);
}
private void RetractFromAggregate(IExecutionContext context, IFactAggregator aggregator, Aggregation aggregation, Tuple tuple, IList <Fact> facts)
{
try
{
aggregator.Remove(aggregation, tuple, facts);
}
catch (AggregateExpressionException e)
{
bool isHandled = false;
context.EventAggregator.RaiseAggregateFailed(context.Session, e.InnerException,
e.Expression, e.Tuple, e.Fact, ref isHandled);
if (!isHandled)
{
throw new RuleExpressionEvaluationException("Failed to evaluate aggregate expression",
e.Expression.ToString(), e.InnerException);
}
ResetAggregator(aggregation, tuple, aggregator);
}
}
private void PropagateAggregation(IExecutionContext context, Aggregation aggregation)
{
PropagateAggregateRetracts(context, aggregation);
PropagateAggregateAsserts(context, aggregation);
PropagateAggregateUpdates(context, aggregation);
}
private void RetractFromAggregate(AggregationContext context, IFactAggregator aggregator, Aggregation aggregation, Tuple tuple, List <Fact> facts)
{
try
{
aggregator.Remove(context, aggregation, tuple, facts);
}
catch (ExpressionEvaluationException e)
{
if (!e.IsHandled)
{
throw new RuleLhsExpressionEvaluationException("Failed to evaluate aggregate expression",
e.Expression.ToString(), e.InnerException);
}
ResetAggregator(aggregation, tuple, aggregator);
}
}
public void Remove(Aggregation aggregation, Tuple tuple, IEnumerable <Fact> facts)
{
var results = _aggregator.Remove(tuple, facts);
AddAggregationResult(aggregation, tuple, results);
}
public void Modify(AggregationContext context, Aggregation aggregation, Tuple tuple, IEnumerable <Fact> facts)
{
var results = _aggregator.Modify(context, tuple, facts);
AddAggregationResult(aggregation, tuple, results);
}
private void ResetAggregator(IExecutionContext context, Aggregation aggregation, Tuple tuple, IFactAggregator aggregator)
{
context.WorkingMemory.RemoveState <IFactAggregator>(this, tuple);
aggregation.Remove(tuple, aggregator.AggregateFacts);
}
