6:27 a.m.
Wolfgang!
SO sorry I missed your boot-camp (I won't miss another). :-) Very grateful to you
for sharing a better solution (via this Hi/Lo Salience,Aux/Crf rule design pattern) --
even though I am unfamiliar with most of the lingo.
Let me "do the work" as it applies to "getting it". As always, thank
you so much for your stellar support.
Ben
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On
Behalf Of Wolfgang Laun
Sent: Monday, November 05, 2012 7:18 AM
To: Rules Users List
Subject: Re: [rules-users] DROOLs callback API for L-value predicate matching events
"Learning the reason for failure to match" is the title of a section in my boot
camp you missed at this year's IntelliFest a couple of weeks ago.
You are getting close to the solution, but here's the outline of the rule programming
design pattern:
Write one rule (high salience) to create an auxiliary fact (Aux), containing a reference
to the fact under investigation (Crf) and a Set.
Write one rule each, combining Aux and Crf, restricting the latter with one of the
required property values/range. On the RHS, add an identification to the set component of
Aux. DO NOT MODIFY/UPDATE.
Write another rule (low salience) combining Aux and Crf and see what Aux contains in the
Set. Retract Aux.
-W
On 05/11/2012, Cotton, Ben <Ben.Cotton(a)morganstanley.com> wrote:
Could a solution be as simple as this? Is this approach to consuming
"LCHUS_IRS_CURRENCY_RULE" L-value matching events sound/complete (and
not-vulnerable to any race condition?). Is there any DROOLS
EventListener callback API that would be more appropriate to solve the problem?
E.g. I want to be able to log when each of these 5 L-value predicates
either "MATCHES" or "FAILS TO MATCH" (at the time of the event)
rule "LCHUS_IRS_CURRENCY_RULE" //XLS Item=195
when
IRDCurrencyRuleFact(
productType == "IRS",
currency=="GBP",
upfrontFeePaymentDate < IRDCurrencyRuleFact.terminationDate,
maturity <= 18275,
//unit = days, i.e. 50 Years
notional <= 99,999,999,999.99
//max Notional
)
then
System.out.println("LCHUS"); end
Again the objective is to be able to join a high-resolution logging
capability wrt to which of the specific 5 L-value predicates matched.
Instinctively, to this DROOLs newbie, this approach seems workable but not
ideal ....
rule "LCHUS_IRS_CURRENCY_RULE_LVALUE_MATCHING_EVENT_1"
when
IRDCurrencyRuleFact(productType == "IRS")
then
System.out.println("LCHUS_IRS_CURRENCY_RULE_L-value event 1
match"); //log event L-value predicate 1 matched
end
rule "LCHUS_IRS_CURRENCY_RULE_LVALUE_MATCHING_EVENT_2"
when
IRDCurrencyRuleFact(currency=="GBP")
then
System.out.println("LCHUS_IRS_CURRENCY_RULE_L-value event 2
match"); //log event L-value predicate 2 matched
end
rule "LCHUS_IRS_CURRENCY_RULE_LVALUE_MATCHING_EVENT_3"
when
IRDCurrencyRuleFact(upfrontFeePaymentDate <
IRDCurrencyRuleFact.terminationDate)
then
System.out.println("LCHUS_IRS_CURRENCY_RULE_L-value event 3
match"); //log event L-value predicate 3 matched
end
rule "LCHUS_IRS_CURRENCY_RULE_LVALUE_MATCHING_EVENT_4"
when
IRDCurrencyRuleFact(maturity <= 18275)
then
System.out.println("LCHUS_IRS_CURRENCY_RULE_L-value event 4
match"); //log event L-value predicate 4 matched
end
rule "LCHUS_IRS_CURRENCY_RULE_LVALUE_MATCHING_EVENT_5"
when
IRDCurrencyRuleFact(notional <= 99,999,999,999.99)
then
System.out.println("LCHUS_IRS_CURRENCY_RULE_L-value event 5
match"); //log event L-value predicate 5 matched
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@ms.com<mailto:ben.cotton@ms.com>
From: rules-users-bounces(a)lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Cotton, Ben
(ISGT)
Sent: Saturday, November 03, 2012 8:24 AM
To: rules-users(a)lists.jboss.org
Cc: O'Brien, Patrick (ISGT)
Subject: [rules-users] DROOLs callback API for L-value predicate matching
events
Hi, Can someone please point me to compelling examples/sample code of how
to use a DROOLs callback API for very high-resolution logging of L-value
predicate matching events?
E.g. I want to be able to log when each of these 5 L-value predicates
either "MATCHES" or "FAILS TO MATCH" (at the time of the event)
rule "LCHUS_IRS_CURRENCY_RULE" //XLS Item=195
when
IRDCurrencyRuleFact(
productType == "IRS",
currency=="GBP",
upfrontFeePaymentDate < IRDCurrencyRuleFact.terminationDate,
maturity <= 18275,
//unit = days, i.e. 50 Years
notional <= 99,999,999,999.99
//max Notional
)
then
System.out.println("LCHUS");
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@ms.com<mailto:ben.cotton@ms.com>
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NOTICE: Morgan Stanley is not acting as a municipal advisor and the opinions or views
contained herein are not intended to be, and do not constitute, advice within the meaning
of Section 975 of the Dodd-Frank Wall Street Reform and Consumer Protection Act. If you
have received this communication in error, please destroy all electronic and paper copies
and notify the sender immediately. Mistransmission is not intended to waive
confidentiality or privilege. Morgan Stanley reserves the right, to the extent permitted
under applicable law, to monitor electronic communications. This message is subject to
terms available at the following link: http://www.morganstanley.com/disclaimers. If you
cannot access these links, please notify us by reply message and we will send the contents
to you. By messaging with Morgan Stanley you consent to the foregoing.