Hi,
I have finally gained a tiny bit of control (and maybe even some competency) in
using the DROOLs language operators 'no-loop' and 'lock-on-active' as a basis
for controlling rule set firing behavior in response to Fact mutation events
(during consequence processing).
I now want to (competently!) use DROOLs language tactics that give me ever
finer grained control over managing rule set firing behavior on Fact mutation
events. Specifically, I want to be able to implement some form of 'Guarded
entry/block' controls.
E.g. let's say I have a Fact (InsertedFactPOJO) that I insert into the KS and
want to have its 'fireAllRules()' AgendaSet(s) renedered in exact incremental
ordinal stages and in perfect isolation. To do this, I am testing the
inclusion of a 'countdownLatch' Semaphore reference as a Fact member
(initialized to N=`total rule count` value). I then use this to 'Guard'
individual rule entry, by generating an explicit predicate participant
(InsertedFactPOJO(countdownLatch == i) )
@ each ith Rule producedby my template.
Is this approach a valid/sound/complete way to implement 'Guarded entry/block'
controls in DROOLs? Is there a better way?
As always, my sincerest gratitude to this community for its generosity (and its
genius).
Ben
package
com.ms.fast.triclear.eligibility.rules.drools_community.questions.posted;
import com.ms.fast.triclear.eligibility.InsertedFactPOJO;
//fact:(backed by Class 'InsertedFactPOJO' has
//- 'countdownLatch' (Semaphore) member
//- 'aList' (List)member
rule "RULE_ALL_RULES_HAVE_FIRED_ONCE_ORDINALLY"
when
fact:InsertedFactPOJO()
InsertedFactPOJO(countdownLatch == 0)
then
System.out.format("\tALL RULES have fired *EXACTLY* once, *EXACTLY*
ordinally. "+
" fact.countdownLatch=%d \n\t fact.aList=%s\n\n",
fact.countdownLatch,
fact.aList.toString());
end
rule "RULE_3"
when
fact:InsertedFactPOJO()
InsertedFactPOJO(countdownLatch == 3)
//bunch of other L-Value PREDICATES
then
System.out.format("\t %20.20s"+
" \t(DROOLS agenda: consequence fired for L-value
predicate match @RULE="+
"3"+" -- fact.countDownLatch=%d)\n", "Rule
3",fact.countdownLatch);
modify (fact) {
countdownLatch = fact.countdownLatch - 1,
aList.add("Rule 3 pattern-match event added to POJO 'aList' field");
}
end
rule "RULE_2"
when
fact:InsertedFactPOJO()
InsertedFactPOJO(countdownLatch == 2)
//bunch of other L-Value PREDICATES
then
System.out.format("\t %20.20s"+
" \t(DROOLS agenda: consequence fired for L-value
predicate match @RULE="+
"2"+" -- fact.countDownLatch=%d)\n", "Rule
2",fact.countdownLatch);
modify (fact) {
countdownLatch = fact.countdownLatch - 1,
aList.add("Rule 2 pattern-match event added to POJO 'aList' field");
}
end
rule "RULE_1"
when
fact:InsertedFactPOJO()
InsertedFactPOJO(countdownLatch == 1)
//bunch of other L-Value PREDICATES
then
System.out.format("\t %20.20s"+
" \t(DROOLS agenda: consequence fired for L-value
predicate match @RULE="+
"1"+" -- fact.countDownLatch=%d)\n", "Rule
1",fact.countdownLatch);
modify (fact) {
countdownLatch = fact.countdownLatch - 1,
aList.add("Rule 1 pattern-match event added to POJO 'aList' field");
}
end
Ben D Cotton III
Morgan Stanley & Co.
OTC Derivatives Clearing Technology
1221 AOTA Rockefeller Ctr - Flr 27
New York, NY 10020
(212)762.9094
[email protected]<mailto:[email protected]>
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