[rules-users] DROOLs 'Guarded entry/block' tactics for Rules synchronization and ordinality?

[Greg Barton]

Have you looked at agenda-group or ruleflow-group?  You've reinvented some of their functionality here.  


________________________________
 From: "Cotton, Ben" <Ben.Cotton at morganstanley.com>
To: "rules-users at lists.jboss.org" <rules-users at lists.jboss.org> 
Cc: "O'Brien, Patrick" <Patrick.O'Brien at morganstanley.com> 
Sent: Thursday, November 29, 2012 10:47 AM
Subject: [rules-users] DROOLs 'Guarded entry/block' tactics for Rules synchronization and ordinality?
 

  
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
 
packagecom.ms.fast.triclear.eligibility.rules.drools_community.questions.posted; 
importcom.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
ben.cotton at ms.com 
 
 

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