[rules-users] DROOLs callback API for L-value predicate matching events
Cotton, Ben
Ben.Cotton at morganstanley.com
Mon Nov 5 07:27:15 EST 2012
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 at lists.jboss.org [mailto:rules-users-bounces at 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 at 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 at ms.com<mailto:ben.cotton at ms.com>
>
>
>
>
> From: rules-users-bounces at lists.jboss.org
> [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Cotton, Ben
> (ISGT)
> Sent: Saturday, November 03, 2012 8:24 AM
> To: rules-users at 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 at ms.com<mailto:ben.cotton at 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.
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