[rules-users] Recursion problem due to modify an object.
Hi,
I am explaining the scenerio of recursion problem which I am facing. I have
three rules in a ruleset.
rule "gst_rate_ol"
no-loop true
salience 50
when
QuoteUpdater:QuoteUpdater()
eval(QuoteUpdater.getCustomerTypeCountry().equals("New Zealand") &&
QuoteUpdater.isFinanceLease() == true ||
QuoteUpdater.isRental() == true ||
QuoteUpdater.isOperatingLease() == true ||
QuoteUpdater.isHirePurchase() == true)
then
System.out.println("1");
TEMP = BigDecimal . valueOf ( 0.125 ) ;
QuoteUpdater . setQuoteLevelGSTRate ( BigDecimal . valueOf ( TEMP .
doubleValue ( ) ) ) ;
modify(QuoteUpdater);
end
rule "NZ_SD"
no-loop true
salience 45
when
QuoteUpdater:QuoteUpdater()
eval(QuoteUpdater . getCustomerTypeCountry ( ).equals("New Zealand"))
then
System.out.println("2");
QuoteUpdater . setQuoteLevelGSTStreamRate ( BigDecimal . valueOf ( 0 ) )
;
QuoteUpdater . setQuoteLevelStampDutyRate ( BigDecimal . valueOf ( 0 ) )
;
GL_SD_Amt = BigDecimal . valueOf ( 0 ) ;
QuoteUpdater . setQuoteLevelStampDutyAmount ( BigDecimal . valueOf ( 0 )
) ;
modify(QuoteUpdater);
end
rule "gst_stream_rate_ol"
salience 40
no-loop true
when
QuoteUpdater:QuoteUpdater()
eval(QuoteUpdater.getCustomerTypeCountry().equals("New Zealand") &&
QuoteUpdater.isRental() == true ||
QuoteUpdater.isOperatingLease() == true)
then
System.out.println("3");
TEMP = BigDecimal . valueOf ( 0.125 ) ;
QuoteUpdater . setQuoteLevelGSTStreamRate ( BigDecimal . valueOf ( TEMP .
doubleValue ( ) ) ) ;
modify(QuoteUpdater);
end
while executing this ruleset a problem of recursion is occouring due to
modify statement. To resolve this problem I have made some changes in drools
code. I am explaining about the changes which I have made. some changes in
following functions.
Class: DefaultAgenda
public boolean fireNextItem(final AgendaFilter filter) throws
ConsequenceException {
final AgendaGroupImpl group = (AgendaGroupImpl) getNextFocus();
// return if there are no Activations to fire
if ( group == null ) {return false;}
final AgendaItem item = (AgendaItem) group.getNext();
if ( item == null ) {return false;}
item.getRule().setFired(true);
if ( filter == null || filter.accept( item ) ) {fireActivation( item
);}
return true;
}
Class: TerminalNode
public void assertTuple(final ReteTuple tuple,final PropagationContext
context,final ReteooWorkingMemory workingMemory,final boolean
fireActivationCreated) {
// if the current Rule is no-loop and the origin rule is the same
then
// return
if ( this.rule.getNoLoop() && this.rule.equals(
context.getRuleOrigin() ) ) {return;}
if(this.rule.isFired()) return;
final InternalAgenda agenda = (InternalAgenda)
workingMemory.getAgenda();
Class: Rule
one attribute added name fired. (type boolean).
By making these changes i am able to execute a rule single time only even
whether there is any modify statement in rule.
Please give your suggestion and feedback on this approach or avioding the
recusrion problem.
Thanks in advance.
Kapil
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